MIL-STD-1750A processors. This target is obsoleted in GCC 3.1.
The MIL-STD-1750A cross configuration produces output for
as1750, an assembler/linker available under the GNU General Public
License for the 1750A. as1750 can be obtained at
ftp://ftp.fta-berlin.de/pub/crossgcc/1750gals/.
A similarly licensed simulator for
the 1750A is available from same address.
You should ignore a fatal error during the building of libgcc
(libgcc is not yet implemented for the 1750A.)
The as1750 assembler requires the file ms1750.inc, which is
found in the directory gcc/config/1750a.
GCC produced the same sections as the Fairchild F9450 C Compiler, namely:
Normal
Static
Konst
Init
The smallest addressable unit is 16 bits (BITS_PER_UNIT is 16). This
means that type char is represented with a 16-bit word per character.
The 1750A's "Load/Store Upper/Lower Byte" instructions are not used by
GCC.
AMD Am29k-family processors. These are normally used in embedded applications. This configuration corresponds to AMD's standard calling sequence and binary interface and is compatible with other 29k tools.
AMD has abandoned this processor. All existing a29k targets are obsoleted in GCC 3.1.
You may need to make a variant of the file a29k.h for your
particular configuration.
AMD Am29050 used in a system running a variant of BSD Unix.
This section contains general configuration information for all alpha-based platforms using ELF (in particular, ignore this section for DEC OSF/1, Digital UNIX and Tru64 UNIX). In addition to reading this section, please read all other sections that match your target.
We require binutils 2.11.2 or newer. Previous binutils releases had a number of problems with DWARF 2 debugging information, not the least of which is incorrect linking of shared libraries.
Systems using processors that implement the DEC Alpha architecture and are running the DEC/Compaq Unix (DEC OSF/1, Digital UNIX, or Compaq Tru64 UNIX) operating system, for example the DEC Alpha AXP systems.
Support for versions before alpha*-dec-osf4 is obsoleted in GCC
3.1. (These are the versions which identify themselves as DEC OSF/1.)
In Digital Unix V4.0, virtual memory exhausted bootstrap failures
may be fixed by configuring with --with-gc=simple,
reconfiguring Kernel Virtual Memory and Swap parameters
per the /usr/sbin/sys_check Tuning Suggestions,
or applying the patch in
http://gcc.gnu.org/ml/gcc/2002-08/msg00822.html.
In Tru64 UNIX V5.1, Compaq introduced a new assembler that does not
currently (2001-06-13) work with mips-tfile. As a workaround,
we need to use the old assembler, invoked via the barely documented
-oldas option. To bootstrap GCC, you either need to use the
Compaq C Compiler:
% CC=cc srcdir/configure [options] [target]
or you can use a copy of GCC 2.95.3 or higher built on Tru64 UNIX V4.0:
% CC=gcc -Wa,-oldas srcdir/configure [options] [target]
As of GNU binutils 2.11.2, neither GNU as nor GNU ld
are supported on Tru64 UNIX, so you must not configure GCC with
--with-gnu-as or --with-gnu-ld.
The --enable-threads options isn't supported yet. A patch is
in preparation for a future release.
GCC writes a .verstamp directive to the assembler output file
unless it is built as a cross-compiler. It gets the version to use from
the system header file /usr/include/stamp.h. If you install a
new version of DEC Unix, you should rebuild GCC to pick up the new version
stamp.
Note that since the Alpha is a 64-bit architecture, cross-compilers from 32-bit machines will not generate code as efficient as that generated when the compiler is running on a 64-bit machine because many optimizations that depend on being able to represent a word on the target in an integral value on the host cannot be performed. Building cross-compilers on the Alpha for 32-bit machines has only been tested in a few cases and may not work properly.
make compare may fail on old versions of DEC Unix unless you add
-save-temps to CFLAGS. On these systems, the name of the
assembler input file is stored in the object file, and that makes
comparison fail if it differs between the stage1 and
stage2 compilations. The option -save-temps forces a
fixed name to be used for the assembler input file, instead of a
randomly chosen name in /tmp. Do not add -save-temps
unless the comparisons fail without that option. If you add
-save-temps, you will have to manually delete the .i and
.s files after each series of compilations.
GCC now supports both the native (ECOFF) debugging format used by DBX
and GDB and an encapsulated STABS format for use only with GDB. See the
discussion of the --with-stabs option of configure above
for more information on these formats and how to select them.
There is a bug in DEC's assembler that produces incorrect line numbers
for ECOFF format when the .align directive is used. To work
around this problem, GCC will not emit such alignment directives
while writing ECOFF format debugging information even if optimization is
being performed. Unfortunately, this has the very undesirable
side-effect that code addresses when -O is specified are
different depending on whether or not -g is also specified.
To avoid this behavior, specify -gstabs+ and use GDB instead of
DBX. DEC is now aware of this problem with the assembler and hopes to
provide a fix shortly.
Cray T3E systems running Unicos/Mk.
This port is incomplete and has many known bugs. We hope to improve the
support for this target soon. Currently, only the C front end is supported,
and it is not possible to build parallel applications. Cray modules are not
supported; in particular, Craylibs are assumed to be in
/opt/ctl/craylibs/craylibs.
You absolutely must use GNU make on this platform. Also, you
need to tell GCC where to find the assembler and the linker. The
simplest way to do so is by providing --with-as and
--with-ld to configure, e.g.
configure --with-as=/opt/ctl/bin/cam --with-ld=/opt/ctl/bin/cld \
--enable-languages=c
The comparison test during make bootstrap fails on Unicos/Mk
because the assembler inserts timestamps into object files. You should
be able to work around this by doing make all after getting this
failure.
Argonaut ARC processor. This configuration is intended for embedded systems.
Advanced RISC Machines ARM-family processors. These are often used in
embedded applications. There are no standard Unix configurations.
This configuration corresponds to the basic instruction sequences and will
produce a.out format object modules.
You may need to make a variant of the file arm.h for your particular
configuration.
This configuration is intended for embedded systems.
We require GNU binutils 2.10 or newer.
The ARM2 or ARM3 processor running RISC iX, Acorn's port of BSD Unix. This configuration is obsoleted in GCC 3.1.
If you are running a version of RISC iX prior to 1.2 then you must
specify the version number during configuration. Note that the
assembler shipped with RISC iX does not support stabs debugging
information; a new version of the assembler, with stabs support
included, is now available from Acorn and via ftp
ftp://ftp.acorn.com/pub/riscix/as+xterm.tar.Z. To enable stabs
debugging, pass --with-gnu-as to configure.
You will need to install GNU sed before you can run configure.
ATMEL AVR-family micro controllers. These are used in embedded applications. There are no standard Unix configurations. See "AVR Options" in the main manual for the list of supported MCU types.
Use configure --target=avr --enable-languages="c" to configure GCC.
Further installation notes and other useful information about AVR tools can also be obtained from:
We strongly recommend using binutils 2.11 or newer.
The following error:
Error: register required
indicates that you should upgrade to a newer version of the binutils.
Texas Instruments TMS320C3x and TMS320C4x Floating Point Digital Signal Processors. These are used in embedded applications. There are no standard Unix configurations. See "TMS320C3x/C4x Options" in the main manual for the list of supported MCU types.
GCC can be configured as a cross compiler for both the C3x and C4x
architectures on the same system. Use configure --target=c4x
--enable-languages="c,c++" to configure.
Further installation notes and other useful information about C4x tools can also be obtained from:
CRIS is the CPU architecture in Axis Communications ETRAX system-on-a-chip series. These are used in embedded applications.
See "CRIS Options" in the main manual for a list of CRIS-specific options.
There are a few different CRIS targets:
cris-axis-aout
elinux a.out-based
target. No multilibs for newer architecture variants.
cris-axis-elf
v10 core used in ETRAX 100 LX.
cris-axis-linux-gnu
ETRAX 100 LX by default.
For cris-axis-aout and cris-axis-elf you need binutils 2.11
or newer. For cris-axis-linux-gnu you need binutils 2.12 or newer.
Pre-packaged tools can be obtained from ftp://ftp.axis.com/pub/axis/tools/cris/compiler-kit/. More information about this platform is available at http://developer.axis.com/.
Please have a look at our binaries page.
You cannot install GCC by itself on MSDOS; it will not compile under any MSDOS compiler except itself. You need to get the complete compilation package DJGPP, which includes binaries as well as sources, and includes all the necessary compilation tools and libraries.
A port to the AT&T DSP1610 family of processors.
The version of binutils installed in /usr/bin is known to work unless
otherwise specified in any per-architecture notes. However, binutils
2.12.1 or greater is known to improve overall testsuite results.
For FreeBSD 1, FreeBSD 2 or any mutant a.out versions of FreeBSD 3: All
configuration support and files as shipped with GCC 2.95 are still in
place. FreeBSD 2.2.7 has been known to bootstrap completely; however,
it is unknown which version of binutils was used (it is assumed that it
was the system copy in /usr/bin) and C++ EH failures were noted.
Support for FreeBSD 1 is obsoleted in GCC 3.1.
For FreeBSD using the ELF file format: DWARF 2 debugging is now the
default for all CPU architectures. It had been the default on
FreeBSD/alpha since its inception. You may use -gstabs instead
of -g, if you really want the old debugging format. There are
no known issues with mixing object files and libraries with different
debugging formats. Otherwise, this release of GCC should now match more
of the configuration used in the stock FreeBSD configuration of GCC. In
particular, --enable-threads is now configured by default.
However, as a general user, do not attempt to replace the system
compiler with this release. Known to bootstrap and check with good
results on FreeBSD 3.0, 3.4, 4.0, 4.2, 4.3, 4.4, 4.5-STABLE and 5-CURRENT.
In principle, --enable-threads is now compatible with
--enable-libgcj on FreeBSD. However, it has only been built
and tested on i386-*-freebsd4.5 and alpha-*-freebsd5.0.
The static
library may be incorrectly built (symbols are missing at link time).
There is a rare timing-based startup hang (probably involves an
assupmtion about the thread library). Multi-threaded boehm-gc (required for
libjava) exposes severe threaded signal-handling bugs on FreeBSD before
4.5-RELEASE. The alpha port may not fully bootstrap without some manual
intervention: gcjh will crash with a floating-point exception while
generating java/lang/Double.h (just copy the version built on
i386-*-freebsd* and rerun the top-level gmake with no
arguments and it
should properly complete the bootstrap). Other CPU architectures
supported by FreeBSD will require additional configuration tuning in, at
the very least, both boehm-gc and libffi.
Shared libgcc_s.so is now built and installed by default.
The Elxsi's C compiler has known limitations that prevent it from compiling GCC. Please contact mrs@wrs.com for more details.
Support for this processor is obsoleted in GCC 3.1.
Hitachi H8/300 series of processors.
Please have a look at our binaries page.
The calling convention and structure layout has changed in release 2.6. All code must be recompiled. The calling convention now passes the first three arguments in function calls in registers. Structures are no longer a multiple of 2 bytes.
We highly recommend using gas/binutils 2.8 or newer on all hppa
platforms; you may encounter a variety of problems when using the HP
assembler. The HP assembler does not work with the hppa64-hp-hpux11*
port.
Specifically, -g does not work on HP-UX (since that system
uses a peculiar debugging format which GCC does not know about), unless you
use GAS and GDB and configure GCC with the
--with-gnu-as and
--with-as=... options.
If you wish to use the pa-risc 2.0 architecture support with a 32-bit runtime, you must use either the HP assembler, gas/binutils 2.11 or newer, or a recent snapshot of gas.
More specific information to hppa*-hp-hpux* targets follows.
The HP assembler has major problems on this platform. We've tried to work around the worst of the problems. However, those workarounds may be causing linker crashes in some circumstances; the workarounds also probably prevent shared libraries from working. Use the GNU assembler to avoid these problems.
The configuration scripts for GCC will also trigger a bug in the hpux9
shell. To avoid this problem set CONFIG_SHELL to /bin/ksh
and SHELL to /bin/ksh in your environment.
For hpux10.20, we highly recommend you pick up the latest sed patch
PHCO_19798 from HP. HP has two sites which provide patches free of
charge:
The HP assembler on these systems is much better than the hpux9 assembler,
but still has some problems. Most notably the assembler inserts timestamps
into each object file it creates, causing the 3-stage comparison test to fail
during a make bootstrap. You should be able to continue by
saying make all after getting the failure from make
bootstrap.
GCC 3.0 and up support HP-UX 11. On 64-bit capable systems, there
are two distinct ports. The hppa2.0w-hp-hpux11* port generates
code for the 32-bit pa-risc runtime architecture. It uses the HP
linker and is currently the default selected by config.guess. The
optional hppa64-hp-hpux11* port generates 64-bit code for the
pa-risc 2.0 architecture. It must be explicitly selected using the
--host=hppa64-hp-hpux11* configure option. Different prefixes
must be used if both ports are to be installed on the same system.
You must use GNU binutils 2.11 or above with the 32-bit port. Thread
support is not currently implemented, so --enable-threads does
not work. See:
GCC 2.95.x is not supported under HP-UX 11 and cannot be used to compile GCC 3.0 and up. Refer to binaries for information about obtaining precompiled GCC binaries for HP-UX.
GNU binutils 2.13 or later is recommended with the 64-bit port. The HP assembler is not supported. It is highly recommended that the GNU linker be used as well. Either binutils must be built prior to gcc, or a binary distribution of gcc or binutils must be obtained for the initial builds. When starting with a HP compiler, it is preferable to use the ANSI compiler as the bundled compiler only supports traditional C. Bootstrapping with the bundled compiler is tested infrequently and problems often arise because of the subtle differences in semantics between traditional and ISO C. There also have been problems reported with various binary distributions. This port still is undergoing significant development.
This port is very preliminary and has many known bugs. We hope to have a higher-quality port for this machine soon.
If you use glibc 2.2 (or 2.1.9x), GCC 2.95.2 won't install
out-of-the-box. You'll get compile errors while building libstdc++.
The patch glibc-2.2.patch, that is to be
applied in the GCC source tree, fixes the compatibility problems.
Currently Glibc 2.2.3 (and older releases) and GCC 3.0 are out of sync since the latest exception handling changes for GCC. Compiling glibc with GCC 3.0 will give a binary incompatible glibc and therefore cause lots of problems and might make your system completly unusable. This will definitly need fixes in glibc but might also need fixes in GCC. We strongly advise to wait for glibc 2.2.4 and to read the release notes of glibc 2.2.4 whether patches for GCC 3.0 are needed. You can use glibc 2.2.3 with GCC 3.0, just do not try to recompile it.
Use this configuration to generate a.out binaries on Linux-based
GNU systems if you do not have gas/binutils version 2.5.2 or later
installed.
This configuration is obsoleted in GCC 3.1.
Use this configuration to generate a.out binaries on Linux-based
GNU systems. This configuration is being superseded. You must use
gas/binutils version 2.5.2 or later.
You will need binutils 2.9.1.0.15 or newer for exception handling to work.
If you receive Signal 11 errors when building on GNU/Linux, then it is possible you have a hardware problem. Further information on this can be found on www.bitwizard.nl.
Compilation with RCC is recommended. Also, it may be a good idea to link with GNU malloc instead of the malloc that comes with the system.
Use this configuration for SCO release 3.2 version 4.
Use this for the SCO OpenServer Release 5 family of operating systems.
Unlike earlier versions of GCC, the ability to generate COFF with this target is no longer provided.
Earlier versions of GCC emitted DWARF 1 when generating ELF to allow the system debugger to be used. That support was too burdensome to maintain. GCC now emits only DWARF 2 for this target. This means you may use either the UDK debugger or GDB to debug programs built by this version of GCC.
Use of the -march=pentiumpro flag can result in
unrecognized opcodes when using the native assembler on OS versions before
5.0.6. (Support for P6 opcodes was added to the native ELF assembler in
that version.) While it's rather rare to see these emitted by GCC yet,
errors of the basic form:
/usr/tmp/ccaNlqBc.s:22:unknown instruction: fcomip
/usr/tmp/ccaNlqBc.s:50:unknown instruction: fucomip
are symptoms of this problem. You may work around this by not building affected files with that flag, by using the GNU assembler, or by using the assembler provided with the current version of the OS. Users of GNU assembler should see the note below for hazards on doing so.
The native SCO assembler that is provided with the OS at no
charge is normally required. If, however, you must be able to use
the GNU assembler (perhaps you're compiling code with asms that
require GAS syntax) you may configure this package using the flags
--with-gnu-as. You must
use a recent version of GNU binutils; versions past 2.9.1 seem to work
well.
In general, the --with-gnu-as option isn't as well tested
as the native assembler.
Look in gcc/config/i386/sco5.h (search for "messy") for
additional OpenServer-specific flags.
Systems based on OpenServer before 5.0.4 (uname -X
will tell you what you're running) require TLS597 from
ftp://ftp.sco.com/TLS/
for C++ constructors and destructors to work right.
The system linker in (at least) 5.0.4 and 5.0.5 will sometimes
do the wrong thing for a construct that GCC will emit for PIC
code. This can be seen as execution testsuite failures when using
-fPIC on 921215-1.c, 931002-1.c, nestfunc-1.c, and gcov-1.c.
For 5.0.5, an updated linker that will cure this problem is
available. You must install both
ftp://ftp.sco.com/Supplements/rs505a/
and OSS499A.
The dynamic linker in OpenServer 5.0.5 (earlier versions may show
the same problem) aborts on certain G77-compiled programs. It's particularly
likely to be triggered by building Fortran code with the -fPIC flag.
Although it's conceivable that the error could be triggered by other
code, only G77-compiled code has been observed to cause this abort.
If you are getting core dumps immediately upon execution of your
G77 program--and especially if it's compiled with -fPIC--try applying
sco_osr5_g77.patch to your libf2c and
rebuilding GCC.
Affected faults, when analyzed in a debugger, will show a stack
backtrace with a fault occurring in rtld() and the program
running as /usr/lib/ld.so.1. This problem has been reported to SCO
engineering and will hopefully be addressed in later releases.
This target emulates the SCO Universal Development Kit and requires that
package be installed. (If it is installed, you will have a
/udk/usr/ccs/bin/cc file present.) It's very much like the
i?86-*-unixware7* target
but is meant to be used when hosting on a system where UDK isn't the
default compiler such as OpenServer 5 or Unixware 2. This target will
generate binaries that will run on OpenServer, Unixware 2, or Unixware 7,
with the same warnings and caveats as the SCO UDK.
This target is a little tricky to build because we have to distinguish it from the native tools (so it gets headers, startups, and libraries from the right place) while making the tools not think we're actually building a cross compiler. The easiest way to do this is with a configure command like this:
CC=/udk/usr/ccs/bin/cc /your/path/to/gcc/configure \
--host=i686-pc-udk --target=i686-pc-udk --program-prefix=udk-
You should substitute i686 in the above command with the appropriate
processor for your host.
After the usual make bootstrap and
make install, you can then access the UDK-targeted GCC
tools by adding udk- before the commonly known name. For
example, to invoke the C compiler, you would use udk-gcc.
They will coexist peacefully with any native-target GCC tools you may
have installed.
This configuration is obsoleted in GCC 3.1.
It may be a good idea to link with GNU malloc instead of the malloc that comes with the system.
In ISC version 4.1, sed core dumps when building
deduced.h. Use the version of sed from version 4.0.
This configuration is obsoleted in GCC 3.1.
You need to use GAS version 2.1 or later, and LD from GNU binutils version 2.2 or later.
This configuration is obsoleted in GCC 3.1.
Go to the Berkeley universe before compiling.
This configuration is obsoleted in GCC 3.1.
You must install GNU sed before running configure.
The fixproto shell script may trigger a bug in the system shell.
If you encounter this problem, upgrade your operating system or
use bash (the GNU shell) to run fixproto.
All support for the i860 processor is obsoleted in GCC 3.1.
On the Intel Paragon (an i860 machine), if you are using operating
system version 1.0, you will get warnings or errors about redefinition
of va_arg when you build GCC.
If this happens, then you need to link most programs with the library
iclib.a. You must also modify stdio.h as follows: before
the lines
#if defined(__i860__) && !defined(_VA_LIST)
#include <va_list.h>
insert the line
#if __PGC__
and after the lines
extern int vprintf(const char *, va_list );
extern int vsprintf(char *, const char *, va_list );
#endif
insert the line
#endif /* __PGC__ */
These problems don't exist in operating system version 1.1.
IA-64 processor (also known as IPF, or Itanium Processor Family) running GNU/Linux.
The toolchain is not completely finished, so requirements will continue to change. GCC 3.0.1 and later require glibc 2.2.4. GCC 3.0.2 requires binutils from 2001-09-05 or later. GCC 3.0.1 requires binutils 2.11.1 or later.
None of the following versions of GCC has an ABI that is compatible with any of the other versions in this list, with the exception that Red Hat 2.96 and Trillian 000171 are compatible with each other: 3.0.2, 3.0.1, 3.0, Red Hat 2.96, and Trillian 000717. This primarily affects C++ programs and programs that create shared libraries. Because of these ABI incompatibilities, GCC 3.0.2 is not recommended for user programs on GNU/Linux systems built using earlier compiler releases. GCC 3.0.2 is recommended for compiling linux, the kernel. GCC 3.0.2 is believed to be fully ABI compliant, and hence no more major ABI changes are expected.
LynxOS 2.2 and earlier comes with GCC 1.x already installed as
/bin/gcc. You should compile with this instead of /bin/cc.
You can tell GCC to use the GNU assembler and linker, by specifying
--with-gnu-as --with-gnu-ld when configuring. These will produce
COFF format object files and executables; otherwise GCC will use the
installed tools, which produce a.out format executables.
AIX Make frequently has problems with GCC makefiles. GNU Make 3.76 or newer is recommended to build on this platform.
Errors involving alloca when building GCC generally are due
to an incorrect definition of CC in the Makefile or mixing files
compiled with the native C compiler and GCC. During the stage1 phase of
the build, the native AIX compiler must be invoked as cc
(not xlc). Once configure has been informed of
xlc, one needs to use make distclean to remove the
configure cache files and ensure that CC environment variable
does not provide a definition that will confuse configure.
If this error occurs during stage2 or later, then the problem most likely
is the version of Make (see above).
The GNU Assembler incorrectly reports that it supports WEAK symbols on
AIX which causes GCC to try to utilize weak symbol functionality which
is not really supported on the platform. The native as and
ld still are recommended. The native AIX tools do
interoperate with GCC.
Building libstdc++.a requires a fix for a AIX Assembler bug
APAR IY26685 (AIX 4.3) or APAR IY25528 (AIX 5.1).
libstdc++ in GCC 3.2 increments the major version number of the
shared object and GCC installation places the libstdc++.a
shared library in a common location which will overwrite the GCC 3.1
version of the shared library. Applications either need to be
re-linked against the new shared library or the GCC 3.1 version of the
libstdc++ shared object needs to be available to the AIX
runtime loader. The GCC 3.1 libstdc++.so.4 shared object can
be installed for runtime dynamic loading using the following steps to
set the F_LOADONLY flag in the shared object for each
multilib libstdc++.a installed:
Extract the shared object from each the GCC 3.1 libstdc++.a
archive:
% ar -x libstdc++.a libstdc++.so.4
Enable the F_LOADONLY flag so that the shared object will be
available for runtime dynamic loading, but not linking:
% strip -e libstdc++.so.4
Archive the runtime-only shared object in the GCC 3.2
libstdc++.a archive:
% ar -q libstdc++.a libstdc++.so.4
Linking executables and shared libraries may produce warnings of duplicate symbols. The assembly files generated by GCC for AIX always have included multiple symbol definitions for certain global variable and function declarations in the original program. The warnings should not prevent the linker from producing a correct library or runnable executable.
AIX 4.3 utilizes a "large format" archive to support both 32-bit and
64-bit object modules. The routines provided in AIX 4.3.0 and AIX 4.3.1
to parse archive libraries did not handle the new format correctly.
These routines are used by GCC and result in error messages during
linking such as "not a COFF file". The version of the routines shipped
with AIX 4.3.1 should work for a 32-bit environment. The -g
option of the archive command may be used to create archives of 32-bit
objects using the original "small format". A correct version of the
routines is shipped with AIX 4.3.2 and above.
Some versions of the AIX binder (linker) can fail with a relocation
overflow severe error when the -bbigtoc option is used to link
GCC-produced object files into an executable that overflows the TOC. A fix
for APAR IX75823 (OVERFLOW DURING LINK WHEN USING GCC AND -BBIGTOC) is
available from IBM Customer Support and from its
techsupport.services.ibm.com
website as PTF U455193.
The AIX 4.3.2.1 linker (bos.rte.bind_cmds Level 4.3.2.1) will dump core with a segmentation fault when invoked by any version of GCC. A fix for APAR IX87327 is available from IBM Customer Support and from its techsupport.services.ibm.com website as PTF U461879. This fix is incorporated in AIX 4.3.3 and above.
The initial assembler shipped with AIX 4.3.0 generates incorrect object files. A fix for APAR IX74254 (64BIT DISASSEMBLED OUTPUT FROM COMPILER FAILS TO ASSEMBLE/BIND) is available from IBM Customer Support and from its techsupport.services.ibm.com website as PTF U453956. This fix is incorporated in AIX 4.3.1 and above.
AIX provides National Language Support (NLS). Compilers and assemblers
use NLS to support locale-specific representations of various data
formats including floating-point numbers (e.g., . vs , for
separating decimal fractions). There have been problems reported where
GCC does not produce the same floating-point formats that the assembler
expects. If one encounters this problem, set the LANG
environment variable to C or En_US.
By default, GCC for AIX 4.1 and above produces code that can be used on both Power or PowerPC processors.
A default can be specified with the -mcpu=cpu_type
switch and using the configure option --with-cpu-cpu_type.
Mitsubishi M32R processor. This configuration is intended for embedded systems.
HP 9000 series 200 running BSD. Note that the C compiler that comes with this system cannot compile GCC; contact law@cygnus.com to get binaries of GCC for bootstrapping.
Motorola 68HC11 family micro controllers. These are used in embedded applications. There are no standard Unix configurations.
Motorola 68HC12 family micro controllers. These are used in embedded applications. There are no standard Unix configurations.
Altos 3068. This configuration is obsoleted in GCC 3.1.
You must use the GNU assembler, linker and debugger. Also, you must fix a kernel bug.
Apple Macintosh running A/UX. This configuration is obsoleted in GCC 3.1.
You may configure GCC to use either the system assembler and
linker or the GNU assembler and linker. You should use the GNU configuration
if you can, especially if you also want to use G++. You enable
that configuration with the --with-gnu-as and --with-gnu-ld
options to configure.
Note the C compiler that comes
with this system cannot compile GCC. You can find binaries of GCC
for bootstrapping on jagubox.gsfc.nasa.gov.
You will also a patched version of /bin/ld there that
raises some of the arbitrary limits found in the original.
AT&T 3b1, a.k.a. 7300 PC. This version of GCC cannot be compiled with the system C compiler, which is too buggy. You will need to get a previous version of GCC and use it to bootstrap. Binaries are available from the OSU-CIS archive, at ftp://archive.cis.ohio-state.edu/pub/att7300/.
Bull DPX/2 series 200 and 300 with BOS-2.00.45 up to BOS-2.01. This configuration is obsoleted in GCC 3.1.
GCC works
either with native assembler or GNU assembler. You can use
GNU assembler with native COFF generation by providing --with-gnu-as to
the configure script or use GNU assembler with stabs-in-COFF encapsulation
by providing --with-gnu-as --stabs. For any problem with the native
assembler or for availability of the DPX/2 port of GAS, contact
F.Pierresteguy@frcl.bull.fr.
Use configure unos for building on Unos.
The Unos assembler is named casm instead of as. For some
strange reason linking /bin/as to /bin/casm changes the
behavior, and does not work. So, when installing GCC, you should
install the following script as as in the subdirectory where
the passes of GCC are installed:
#!/bin/sh
casm $*
The default Unos library is named libunos.a instead of
libc.a. To allow GCC to function, either change all
references to -lc in gcc.c to -lunos or link
/lib/libc.a to /lib/libunos.a.
When compiling GCC with the standard compiler, to overcome bugs in
the support of alloca, do not use -O when making stage 2.
Then use the stage 2 compiler with -O to make the stage 3
compiler. This compiler will have the same characteristics as the usual
stage 2 compiler on other systems. Use it to make a stage 4 compiler
and compare that with stage 3 to verify proper compilation.
(Perhaps simply defining ALLOCA in x-crds as described in
the comments there will make the above paragraph superfluous. Please
inform us of whether this works.)
Unos uses memory segmentation instead of demand paging, so you will need
a lot of memory. 5 Mb is barely enough if no other tasks are running.
If linking cc1 fails, try putting the object files into a library
and linking from that library.
HP 9000 series 300 or 400 running HP-UX. HP-UX version 8.0 has a bug in
the assembler that prevents compilation of GCC. This
bug manifests itself during the first stage of compilation, while
building libgcc2.a:
_floatdisf
cc1: warning: `-g' option not supported on this version of GCC
cc1: warning: `-g1' option not supported on this version of GCC
./xgcc: Internal compiler error: program as got fatal signal 11
A patched version of the assembler is available as the file ftp://altdorf.ai.mit.edu/archive/cph/hpux-8.0-assembler. If you have HP software support, the patch can also be obtained directly from HP, as described in the following note:
This is the patched assembler, to patch SR#1653-010439, where the assembler aborts on floating point constants.The bug is not really in the assembler, but in the shared library version of the function "cvtnum(3c)". The bug on "cvtnum(3c)" is SR#4701-078451. Anyway, the attached assembler uses the archive library version of "cvtnum(3c)" and thus does not exhibit the bug.
This patch is also known as PHCO_4484.
In addition, if you wish to use gas, you must use gas version 2.1 or later, and you must use the GNU linker version 2.1 or later. Earlier versions of gas relied upon a program which converted the gas output into the native HP-UX format, but that program has not been kept up to date. gdb does not understand that native HP-UX format, so you must use gas if you wish to use gdb.
On HP-UX version 8.05, but not on 8.07 or more recent versions, the
fixproto shell script triggers a bug in the system shell. If you
encounter this problem, upgrade your operating system or use BASH (the
GNU shell) to run fixproto. This bug will cause the fixproto
program to report an error of the form:
./fixproto: sh internal 1K buffer overflow
To fix this, you can also change the first line of the fixproto script to look like:
#!/bin/ksh
These configurations are obsoleted in GCC 3.1.
Current GCC versions probably do not work on version 2 of the NeXT operating system.
On NeXTStep 3.0, the Objective-C compiler does not work, due, apparently, to a kernel bug that it happens to trigger. This problem does not happen on 3.1.
You absolutely must use GNU sed and GNU make on this platform.
On NeXTSTEP 3.x where x < 3 the build of GCC will abort during stage1 with an error message like this:
_eh
/usr/tmp/ccbbsZ0U.s:987:Unknown pseudo-op: .section
/usr/tmp/ccbbsZ0U.s:987:Rest of line ignored. 1st junk character
valued 95 (_).
The reason for this is the fact that NeXT's assembler for these
versions of the operating system does not support the .section
pseudo op that's needed for full C++ exception functionality.
As NeXT's assembler is a derived work from GNU as, a free replacement that does can be obtained at ftp://ftp.next.peak.org:/next-ftp/next/apps/devtools/as.3.3.NIHS.s.tar.gz.
If you try to build the integrated C++ & C++ runtime libraries on this system you will run into trouble with include files. The way to get around this is to use the following sequence. Note you must have write permission to the directory prefix you specified in the configuration process of GCC for this sequence to work.
cd bld-gcc
make all-texinfo all-bison all-byacc all-binutils all-gas all-ld
cd gcc
make bootstrap
make install-headers-tar
cd ..
make bootstrap3
On the Tower models 4n0 and 6n0, by default a process is not
allowed to have more than one megabyte of memory. GCC cannot compile
itself (or many other programs) with -O in that much memory.
To solve this problem, reconfigure the kernel adding the following line to the configuration file:
MAXUMEM = 4096
Sun 3. We do not provide a configuration file to use the Sun FPA by default, because programs that establish signal handlers for floating point traps inherently cannot work with the FPA.
It is reported that you may need the GNU assembler on this platform.
Motorola m88k running the AT&T/Unisoft/Motorola V.3 reference port. These configurations are obsoleted in GCC 3.1.
These systems tend to use the Green Hills C, revision 1.8.5, as the standard C compiler. There are apparently bugs in this compiler that result in object files differences between stage 2 and stage 3. If this happens, make the stage 4 compiler and compare it to the stage 3 compiler. If the stage 3 and stage 4 object files are identical, this suggests you encountered a problem with the standard C compiler; the stage 3 and 4 compilers may be usable.
It is best, however, to use an older version of GCC for bootstrapping if you have one.
Motorola m88k running DG/UX. These configurations are obsoleted in GCC 3.1.
To build 88open BCS native or cross
compilers on DG/UX, specify the configuration name as
m88k-*-dguxbcs and build in the 88open BCS software development
environment. To build ELF native or cross compilers on DG/UX, specify
m88k-*-dgux and build in the DG/UX ELF development environment.
You set the software development environment by issuing
sde-target command and specifying either m88kbcs or
m88kdguxelf as the operand.
If you do not specify a configuration name, configure guesses the
configuration based on the current software development environment.
Tektronix XD88 running UTekV 3.2e. These configurations are obsoleted in GCC 3.1.
Do not turn on optimization while building stage1 if you bootstrap with the buggy Green Hills compiler. Also, the bundled LAI System V NFS is buggy so if you build in an NFS mounted directory, start from a fresh reboot, or avoid NFS all together. Otherwise you may have trouble getting clean comparisons between stages.
If you use the 1.31 version of the MIPS assembler (such as was shipped
with Ultrix 3.1), you will need to use the -fno-delayed-branch switch
when optimizing floating point code. Otherwise, the assembler will
complain when the GCC compiler fills a branch delay slot with a
floating point instruction, such as add.d.
If on a MIPS system you get an error message saying "does not have gp sections for all it's [sic] sectons [sic]", don't worry about it. This happens whenever you use GAS with the MIPS linker, but there is not really anything wrong, and it is okay to use the output file. You can stop such warnings by installing the GNU linker.
It would be nice to extend GAS to produce the gp tables, but they are optional, and there should not be a warning about their absence.
Users have reported some problems with version 2.0 of the MIPS compiler tools that were shipped with Ultrix 4.1. Version 2.10 which came with Ultrix 4.2 seems to work fine.
Users have also reported some problems with version 2.20 of the MIPS compiler tools that were shipped with RISC/os 4.x. The earlier version 2.11 seems to work fine.
Some versions of the MIPS linker will issue an assertion failure
when linking code that uses alloca against shared
libraries on RISC-OS 5.0, and DEC's OSF/1 systems. This is a bug
in the linker, that is supposed to be fixed in future revisions.
To protect against this, GCC passes -non_shared to the
linker unless you pass an explicit -shared or
-call_shared switch.
MIPS machines running the MIPS operating system in BSD mode. These configurations are obsoleted in GCC 3.1.
It's possible that some old versions of the system lack the functions
memcpy, memmove, memcmp, and memset. If your
system lacks these, you must remove or undo the definition of
TARGET_MEM_FUNCTIONS in mips-bsd.h.
If you use the MIPS C compiler to bootstrap, it may be necessary
to increase its table size for switch statements with the
-Wf,-XNg1500 option. If you use the -O2
optimization option, you also need to use -Olimit 3000.
Both of these options are automatically generated in the
Makefile that the shell script configure builds.
If you override the CC make variable and use the MIPS
compilers, you may need to add -Wf,-XNg1500 -Olimit 3000.
These configurations are obsoleted in GCC 3.1.
MIPS-based DECstations can support three different personalities:
Ultrix, DEC OSF/1, and OSF/rose. (Alpha-based DECstation products have
a configuration name beginning with alpha*-dec.) To configure GCC
for these platforms use the following configurations:
mips-dec-ultrix
mips-dec-osf1
mips-dec-osfrose
If you use the MIPS C compiler to bootstrap, it may be necessary
to increase its table size for switch statements with the
-Wf,-XNg1500 option. If you use the -O2
optimization option, you also need to use -Olimit 3000.
Both of these options are automatically generated in the
Makefile that the shell script configure builds.
If you override the CC make variable and use the MIPS
compilers, you may need to add -Wf,-XNg1500 -Olimit 3000.
These configurations are obsoleted in GCC 3.1.
If you use the MIPS C compiler to bootstrap, it may be necessary
to increase its table size for switch statements with the
-Wf,-XNg1500 option. If you use the -O2
optimization option, you also need to use -Olimit 3000.
Both of these options are automatically generated in the
Makefile that the shell script configure builds.
If you override the CC make variable and use the MIPS
compilers, you may need to add -Wf,-XNg1500 -Olimit 3000.
MIPS computers running RISC-OS can support four different personalities: default, BSD 4.3, System V.3, and System V.4 (older versions of RISC-OS don't support V.4). To configure GCC for these platforms use the following configurations:
mips-mips-riscosrevmips-mips-riscosrevbsd
mips-mips-riscosrevsysv4
mips-mips-riscosrevsysv
The revision rev mentioned above is the revision of
RISC-OS to use. You must reconfigure GCC when going from a
RISC-OS revision 4 to RISC-OS revision 5. This has the effect of
avoiding a linker bug.
This configuration is obsoleted in GCC 3.1.
In order to compile GCC on an SGI running IRIX 4, the "c.hdr.lib" option must be installed from the CD-ROM supplied from Silicon Graphics. This is found on the 2nd CD in release 4.0.1.
On IRIX version 4.0.5F, and perhaps on some other versions as well,
there is an assembler bug that reorders instructions incorrectly. To
work around it, specify the target configuration
mips-sgi-irix4loser. This configuration inhibits assembler
optimization.
In a compiler configured with target mips-sgi-irix4, you can turn
off assembler optimization by using the -noasmopt option. This
compiler option passes the option -O0 to the assembler, to
inhibit reordering.
The -noasmopt option can be useful for testing whether a problem
is due to erroneous assembler reordering. Even if a problem does not go
away with -noasmopt, it may still be due to assembler
reordering--perhaps GCC itself was miscompiled as a result.
You may get the following warning on IRIX 4 platforms, it can be safely ignored.
warning: foo.o does not have gp tables for all its sections.
This configuration has considerable problems, which will be fixed in a future release.
In order to compile GCC on an SGI running IRIX 5, the "compiler_dev.hdr" subsystem must be installed from the IDO CD-ROM supplied by Silicon Graphics. It is also available for download from http://www.sgi.com/developers/devtools/apis/ido.html.
make compare may fail on version 5 of IRIX unless you add
-save-temps to CFLAGS. On these systems, the name of the
assembler input file is stored in the object file, and that makes
comparison fail if it differs between the stage1 and
stage2 compilations. The option -save-temps forces a
fixed name to be used for the assembler input file, instead of a
randomly chosen name in /tmp. Do not add -save-temps
unless the comparisons fail without that option. If you do you
-save-temps, you will have to manually delete the .i and
.s files after each series of compilations.
If you use the MIPS C compiler to bootstrap, it may be necessary
to increase its table size for switch statements with the
-Wf,-XNg1500 option. If you use the -O2
optimization option, you also need to use -Olimit 3000.
To enable debugging under IRIX 5, you must use GNU as 2.11.2
or later,
and use the --with-gnu-as configure option when configuring GCC.
GNU as is distributed as part of the binutils package.
When using release 2.11.2, you need to apply a patch
http://sources.redhat.com/ml/binutils/2001-07/msg00352.html
which will be included in the next release of binutils.
When building GCC, the build process loops rebuilding cc1 over
and over again. This happens on mips-sgi-irix5.2, and possibly
other platforms. It has been reported that this is a known bug in the
make shipped with IRIX 5.2. We recommend you use GNU
make instead of the vendor supplied make program;
however, you may have success with smake on IRIX 5.2 if you do
not have GNU make available.
If you are using IRIX cc as your bootstrap compiler, you must
ensure that the N32 ABI is in use. To test this, compile a simple C
file with cc and then run file on the
resulting object file. The output should look like:
test.o: ELF N32 MSB ...
If you see:
test.o: ELF 32-bit MSB ...
or
test.o: ELF 64-bit MSB ...
then your version of cc uses the O32 or N64 ABI by default. You
should set the environment variable CC to cc -n32
before configuring GCC.
If you want the resulting gcc to run on old 32-bit systems
with the MIPS R4400 CPU, you need to ensure that only code for the mips3
instruction set architecture (ISA) is generated. While GCC 3.x does
this correctly, both GCC 2.95 and SGI's MIPSpro cc may change
the ISA depending on the machine where GCC is built. Using one of them
as the bootstrap compiler may result in mips4 code, which won't run at
all on mips3-only systems. For the test program above, you should see:
test.o: ELF N32 MSB mips-3 ...
If you get:
test.o: ELF N32 MSB mips-4 ...
instead, you should set the environment variable CC to cc
-n32 -mips3 or gcc -mips3 respectively before configuring GCC.
GCC on IRIX 6 is usually built to support both the N32 and N64 ABIs. If
you build GCC on a system that doesn't have the N64 libraries installed,
you need to configure with --disable-multilib so GCC doesn't
try to use them. Look for /usr/lib64/libc.so.1 to see if you
have the 64-bit libraries installed.
You must not use GNU as (which isn't built anyway as of
binutils 2.11.2) on IRIX 6 platforms; doing so will only cause problems.
GCC does not currently support generating O32 ABI binaries in the
mips-sgi-irix6 configurations. It is possible to create a GCC
with O32 ABI only support by configuring it for the mips-sgi-irix5
target and using a patched GNU as 2.11.2 as documented in the
mips-sgi-irix5 section above. Using the
native assembler requires patches to GCC which will be included in a
future release. It is
expected that O32 ABI support will be available again in a future release.
The --enable-threads option doesn't currently work, a patch is
in preparation for a future release. The --enable-libgcj
option is disabled by default: IRIX 6 uses a very low default limit
(20480) for the command line length. Although libtool contains a
workaround for this problem, at least the N64 libgcj is known not
to build despite this, running into an internal error of the native
ld. A sure fix is to increase this limit (ncargs) to
its maximum of 262144 bytes. If you have root access, you can use the
systune command to do this.
GCC does not correctly pass/return structures which are smaller than 16 bytes and which are not 8 bytes. The problem is very involved and difficult to fix. It affects a number of other targets also, but IRIX 6 is affected the most, because it is a 64-bit target, and 4 byte structures are common. The exact problem is that structures are being padded at the wrong end, e.g. a 4 byte structure is loaded into the lower 4 bytes of the register when it should be loaded into the upper 4 bytes of the register.
GCC is consistent with itself, but not consistent with the SGI C compiler
(and the SGI supplied runtime libraries), so the only failures that can
happen are when there are library functions that take/return such
structures. There are very few such library functions. Currently this
is known to affect inet_ntoa, inet_lnaof,
inet_netof, inet_makeaddr, and semctl. Until the
bug is fixed, GCC contains workarounds for the known affected functions.
See http://freeware.sgi.com/ for more information about using GCC on IRIX platforms.
Sony MIPS NEWS. This configuration is obsoleted in GCC 3.1.
This works in NEWSOS 5.0.1, but not in 5.0.2 (which uses ELF instead of COFF). In particular, the linker does not like the code generated by GCC when shared libraries are linked in.
This configuration is obsoleted in GCC 3.1.
Encore ns32000 system. Encore systems are supported only under BSD.
National Semiconductor ns32000 system. This configuration is obsoleted in GCC 3.1.
Genix has bugs in alloca and malloc; you must get the
compiled versions of these from GNU Emacs.
This configuration is obsoleted in GCC 3.1.
Go to the Berkeley universe before compiling.
UTEK ns32000 system ("merlin"). This configuration is obsoleted in GCC 3.1.
The C compiler that comes with this system cannot compile GCC; contact
tektronix!reed!mason to get binaries of GCC for bootstrapping.
You can specify a default version for the -mcpu=cpu_type
switch by using the configure option --with-cpu-cpu_type.
PowerPC running Darwin (Mac OS X kernel).
GCC 3.0 does not support Darwin, but 3.1 and later releases will work.
Pre-installed versions of Mac OS X may not include any developer tools, meaning that you will not be able to build GCC from source. Tool binaries are available at http://www.opensource.apple.com/projects/darwin (free registration required).
Versions of the assembler prior to "cctools-364" cannot handle the
4-argument form of rlwinm and related mask-using instructions. Darwin
1.3 (Mac OS X 10.0) uses cctools-353 for instance. To get cctools-364,
check out cctools with tag Apple-364, build it, and
install the assembler as usr/bin/as. See
http://www.opensource.apple.com/tools/cvs/docs.html for details.
Also, the default stack limit of 512K is too small, and a bootstrap will
typically fail when self-compiling expr.c. Set the stack to 800K
or more, for instance by doing limit stack 800. It's also
convenient to use the GNU preprocessor instead of Apple's during the
first stage of bootstrapping; this is automatic when doing make
bootstrap, but to do it from the toplevel objdir you will need to say
make CC='cc -no-cpp-precomp' bootstrap.
Note that the version of GCC shipped by Apple typically includes a number of extensions not available in a standard GCC release. These extensions are generally specific to Mac programming.
PowerPC system in big endian mode, running System V.4.
You will need binutils 2.13.90.0.10 or newer for a working GCC.
PowerPC system in big endian mode running NetBSD. To build the documentation you will need Texinfo version 4.1 (NetBSD 1.5.1 included Texinfo version 3.12).
Embedded PowerPC system in big endian mode with -mcall-aix selected as
the default.
Embedded PowerPC system in big endian mode for use in running under the PSIM simulator.
Embedded PowerPC system in big endian mode.
PowerPC system in little endian mode, running System V.4.
Embedded PowerPC system in little endian mode for use in running under the PSIM simulator.
Embedded PowerPC system in little endian mode.
PowerPC system in little endian mode running Windows NT.
These configurations are obsoleted in GCC 3.1.
We recommend you compile GCC with an earlier version of itself; if you
compile GCC with hc, the Metaware compiler, it will work, but
you will get mismatches between the stage 2 and stage 3 compilers in
various files. These errors are minor differences in some
floating-point constants and can be safely ignored; the stage 3 compiler
is correct.
S/390 system running Linux for S/390.
zSeries system (64-bit) running Linux for zSeries.
Sun does not ship a C compiler with Solaris 2. To bootstrap and install GCC you first have to install a pre-built compiler, see our binaries page for details.
The Solaris 2 /bin/sh will often fail to configure
libstdc++-v3, boehm-gc or
libjava. If you encounter this problem, set CONFIG_SHELL to
/bin/ksh in your environment before running configure.
Solaris 2 comes with a number of optional OS packages. Some of these
packages are needed to use GCC fully, namely SUNWarc,
SUNWbtool, SUNWesu, SUNWhea, SUNWlibm,
SUNWsprot, and SUNWtoo. If you did not install all
optional packages when installing Solaris 2, you will need to verify that
the packages that GCC needs are installed.
To check whether an optional package is installed, use
the pkginfo command. To add an optional package, use the
pkgadd command. For further details, see the Solaris 2
documentation.
Trying to use the linker and other tools in
/usr/ucb to install GCC has been observed to cause trouble.
For example, the linker may hang indefinitely. The fix is to remove
/usr/ucb from your PATH.
All releases of GNU binutils prior to 2.11.2 have known bugs on this
platform. We recommend the use of GNU binutils 2.11.2 or the vendor
tools (Sun as, Sun ld).
Sun bug 4296832 turns up when compiling X11 headers with GCC 2.95 or
newer: g++ will complain that types are missing. These headers assume
that omitting the type means int; this assumption worked for C89 but
is wrong for C++, and is now wrong for C99 also.
g++ accepts such (invalid) constructs with the option
-fpermissive; it
will assume that any missing type is int (as defined by C89).
There are patches for Solaris 2.6 (105633-56 or newer for SPARC, 106248-42 or newer for Intel), Solaris 7 (108376-21 or newer for SPARC, 108377-20 for Intel), and Solaris 8 (108652-24 or newer for SPARC, 108653-22 for Intel) that fix this bug.
When GCC is configured to use binutils 2.11.2 or later the binaries produced are smaller than the ones produced using Sun's native tools; this difference is quite significant for binaries containing debugging information.
Sun as 4.x is broken in that it cannot cope with long symbol names.
A typical error message might look similar to the following:
/usr/ccs/bin/as: "/var/tmp/ccMsw135.s", line 11041: error:
can't compute value of an expression involving an external symbol.
This is Sun bug 4237974. This is fixed with patch 108908-02 for Solaris 2.6 and has been fixed in later (5.x) versions of the assembler, starting with Solaris 7.
Starting with Solaris 7, the operating system is capable of executing
64-bit SPARC V9 binaries. GCC 3.1 and later properly supports
this; the -m64 option enables 64-bit code generation.
However, if all you want is code tuned for the UltraSPARC CPU, you
should try the -mtune=ultrasparc option instead, which produces
code that, unlike full 64-bit code, can still run on non-UltraSPARC
machines.
When configuring on a Solaris 7 or later system that is running a kernel
that supports only 32-bit binaries, one must configure with
--disable-multilib, since we will not be able to build the
64-bit target libraries.
Sun patch 107058-01 (1999-01-13) for Solaris 7/SPARC triggers a bug in the dynamic linker. This problem (Sun bug 4210064) affects GCC 2.8 and later, including all EGCS releases. Sun formerly recommended 107058-01 for all Solaris 7 users, but around 1999-09-01 it started to recommend it only for people who use Sun's compilers.
Here are some workarounds to this problem:
/usr/ccs/bin/as into
/usr/local/lib/gcc-lib/sparc-sun-solaris2.7/3.1/as,
adjusting the latter name to fit your local conventions and software
version numbers.
A bug in the SunOS 4 linker will cause it to crash when linking
-fPIC compiled objects (and will therefore not allow you to build
shared libraries).
To fix this problem you can either use the most recent version of binutils or get the latest SunOS 4 linker patch (patch ID 100170-10) from Sun's patch site.
Sometimes on a Sun 4 you may observe a crash in the program
genflags or genoutput while building GCC. This is said to
be due to a bug in sh. You can probably get around it by running
genflags or genoutput manually and then retrying the
make.
It has been reported that you might need binutils 2.8.1.0.23 for this platform, too.
GCC versions 3.0 and higher require binutils 2.11.2 and glibc 2.2.4
or newer on this platform. All earlier binutils and glibc
releases mishandled unaligned relocations on sparc-*-* targets.
GCC version 2.95 is not able to compile code correctly for
sparc64 targets. Users of the Linux kernel, at least,
can use the sparc32 program to start up a new shell
invocation with an environment that causes configure to
recognize (via uname -a) the system as sparc-*-* instead.
The following compiler flags must be specified in the configure step in order to bootstrap this target with the Sun compiler:
% CC="cc -xildoff -xarch=v9" srcdir/configure [options] [target]
-xildoff turns off the incremental linker, and -xarch=v9
specifies the v9 architecture to the Sun linker and assembler.
On System V release 3, you may get this error message while linking:
ld fatal: failed to write symbol name something
in strings table for file whatever
This probably indicates that the disk is full or your ulimit won't allow the file to be as large as it needs to be.
This problem can also result because the kernel parameter MAXUMEM
is too small. If so, you must regenerate the kernel and make the value
much larger. The default value is reported to be 1024; a value of 32768
is said to work. Smaller values may also work.
On System V, if you get an error like this,
/usr/local/lib/bison.simple: In function `yyparse':
/usr/local/lib/bison.simple:625: virtual memory exhausted
that too indicates a problem with disk space, ulimit, or MAXUMEM.
On a System V release 4 system, make sure /usr/bin precedes
/usr/ucb in PATH. The cc command in
/usr/ucb uses libraries which have bugs.
Don't try compiling with VAX C (vcc). It produces incorrect code
in some cases (for example, when alloca is used).
These computers are also known as the 3b2, 3b5, 3b20 and other similar names. (However, the 3b1 is actually a 68000.) These configurations are obsoleted in GCC 3.1.
Don't use -g when compiling with the system's compiler. The
system's linker seems to be unable to handle such a large program with
debugging information.
The system's compiler runs out of capacity when compiling stmt.c
in GCC. You can work around this by building cpp in GCC
first, then use that instead of the system's preprocessor with the
system's C compiler to compile stmt.c. Here is how:
mv /lib/cpp /lib/cpp.att
cp cpp /lib/cpp.gnu
echo '/lib/cpp.gnu -traditional ${1+"$@"}' > /lib/cpp
chmod +x /lib/cpp
The system's compiler produces bad code for some of the GCC optimization files. So you must build the stage 2 compiler without optimization. Then build a stage 3 compiler with optimization. That executable should work. Here are the necessary commands:
make LANGUAGES=c CC=stage1/xgcc CFLAGS="-Bstage1/ -g"
make stage2
make CC=stage2/xgcc CFLAGS="-Bstage2/ -g -O"
You may need to raise the ULIMIT setting to build a C++ compiler,
as the file cc1plus is larger than one megabyte.
This target is intended for embedded Xtensa systems using the
newlib C library. It uses ELF but does not support shared
objects. Designed-defined instructions specified via the
Tensilica Instruction Extension (TIE) language are only supported
through inline assembly.
The Xtensa configuration information must be specified prior to
building GCC. The gcc/config/xtensa/xtensa-config.h header
file contains the configuration information. If you created your
own Xtensa configuration with the Xtensa Processor Generator, the
downloaded files include a customized copy of this header file,
which you can use to replace the default header file.
This target is for Xtensa systems running GNU/Linux. It supports ELF
shared objects and the GNU C library (glibc). It also generates
position-independent code (PIC) regardless of whether the
-fpic or -fPIC options are used. In other
respects, this target is the same as the
xtensa-*-elf target.
A port of GCC 2.95.x is included with the Cygwin environment.
Current (as of early 2001) snapshots of GCC will build under Cygwin without modification.
GCC does not currently support OS/2. However, Andrew Zabolotny has been working on a generic OS/2 port with pgcc. The current code can be found at http://www.goof.com/pcg/os2/.
An older copy of GCC 2.8.1 is included with the EMX tools available at ftp://ftp.leo.org/pub/comp/os/os2/leo/devtools/emx+gcc/.
GCC contains support files for many older (1980s and early 1990s) Unix variants. For the most part, support for these systems has not been deliberately removed, but it has not been maintained for several years and may suffer from bitrot. Support from some systems has been removed from GCC 3: fx80, ns32-ns-genix, pyramid, tahoe, gmicro, spur; most of these targets had not been updated since GCC version 1.
We are planning to remove support for more older systems, starting in
GCC 3.1. Each release will have a list of "obsoleted" systems.
Support for these systems is still present in that release, but
configure will fail unless the --enable-obsolete
option is given. Unless a maintainer steps forward, support for
these systems will be removed from the next release of GCC.
Support for older systems as targets for cross-compilation is less problematic than support for them as hosts for GCC; if an enthusiast wishes to make such a target work again (including resurrecting any of the targets that never worked with GCC 2, starting from the last CVS version before they were removed), patches following the usual requirements would be likely to be accepted, since they should not affect the support for more modern targets.
Support for old systems as hosts for GCC can cause problems if the
workarounds for compiler, library and operating system bugs affect the
cleanliness or maintainability of the rest of GCC. In some cases, to
bring GCC up on such a system, if still possible with current GCC, may
require first installing an old version of GCC which did work on that
system, and using it to compile a more recent GCC, to avoid bugs in
the vendor compiler. Old releases of GCC 1 and GCC 2 are available in
the old-releases directory on the
GCC mirror sites. Header bugs may generally
be avoided using fixincludes, but bugs or deficiencies in
libraries and the operating system may still cause problems.
For some systems, old versions of GNU binutils may also be useful,
and are available from pub/binutils/old-releases on
sources.redhat.com mirror sites.
Some of the information on specific systems above relates to such older systems, but much of the information about GCC on such systems (which may no longer be applicable to current GCC) is to be found in the GCC texinfo manual.
C++ support is significantly better on ELF targets if you use the GNU linker; duplicate copies of inlines, vtables and template instantiations will be discarded automatically.