X-Git-Url: https://oss.titaniummirror.com/gitweb?a=blobdiff_plain;f=gcc%2Fconfig%2Fdarwin.h;h=050773fb130202817234a49df361df14720edd75;hb=6fed43773c9b0ce596dca5686f37ac3fc0fa11c0;hp=05ca85bdb8c96f77b0e4f5784e751fa0e7a14f2d;hpb=27b11d56b743098deb193d510b337ba22dc52e5c;p=msp430-gcc.git

diff --git a/gcc/config/darwin.h b/gcc/config/darwin.h
index 05ca85bd..050773fb 100644
--- a/gcc/config/darwin.h
+++ b/gcc/config/darwin.h
@@ -1,24 +1,32 @@
 /* Target definitions for Darwin (Mac OS X) systems.
-   Copyright (C) 1989, 1990, 1991, 1992, 1993, 2000, 2001, 2002
+   Copyright (C) 1989, 1990, 1991, 1992, 1993, 2000, 2001, 2002, 2003, 2004,
+   2005, 2006, 2007, 2008, 2009
    Free Software Foundation, Inc.
    Contributed by Apple Computer Inc.
 
-This file is part of GNU CC.
+This file is part of GCC.
 
-GNU CC is free software; you can redistribute it and/or modify
+GCC is free software; you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
-the Free Software Foundation; either version 2, or (at your option)
+the Free Software Foundation; either version 3, or (at your option)
 any later version.
 
-GNU CC is distributed in the hope that it will be useful,
+GCC is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.
 
-You should have received a copy of the GNU General Public License
-along with GNU CC; see the file COPYING.  If not, write to
-the Free Software Foundation, 59 Temple Place - Suite 330,
-Boston, MA 02111-1307, USA.  */
+Under Section 7 of GPL version 3, you are granted additional
+permissions described in the GCC Runtime Library Exception, version
+3.1, as published by the Free Software Foundation.
+
+You should have received a copy of the GNU General Public License and
+a copy of the GCC Runtime Library Exception along with this program;
+see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+<http://www.gnu.org/licenses/>.  */
+
+#ifndef CONFIG_DARWIN_H
+#define CONFIG_DARWIN_H
 
 /* The definitions in this file are common to all processor types
    running Darwin, which is the kernel for Mac OS X.  Darwin is
@@ -30,15 +38,16 @@ Boston, MA 02111-1307, USA.  */
 /* Although NeXT ran on many different architectures, as of Jan 2001
    the only supported Darwin targets are PowerPC and x86.  */
 
-/* Technically, STANDARD_EXEC_PREFIX should be /usr/libexec/, but in
-   practice this makes it hard to install new compilers elsewhere, so
-   leave it undefined and expect system builders to set configure args
-   correctly.  */
+/* One of Darwin's NeXT legacies is the Mach-O format, which is partly
+   like a.out and partly like COFF, with additional features like
+   multi-architecture binary support.  */
 
-/* Suppress g++ attempt to link in the math library automatically.
-   (Some Darwin versions have a libm, but they seem to cause problems
-   for C++ executables.)  */
+#define OBJECT_FORMAT_MACHO
 
+/* Don't assume anything about the header files.  */
+#define NO_IMPLICIT_EXTERN_C
+
+/* Suppress g++ attempt to link in the math library automatically. */
 #define MATH_LIBRARY ""
 
 /* We have atexit.  */
@@ -78,77 +87,436 @@ Boston, MA 02111-1307, USA.  */
 #undef	DEFAULT_PCC_STRUCT_RETURN
 #define DEFAULT_PCC_STRUCT_RETURN 0
 
-/* Don't warn about MacOS-style 'APPL' four-char-constants.  */
-
-#undef WARN_FOUR_CHAR_CONSTANTS
-#define WARN_FOUR_CHAR_CONSTANTS 0
+/* True if pragma ms_struct is in effect.  */
+extern GTY(()) int darwin_ms_struct;
+
+/* This table intercepts weirdo options whose names would interfere
+   with normal driver conventions, and either translates them into
+   standardly-named options, or adds a 'Z' so that they can get to
+   specs processing without interference.
+
+   Do not expand a linker option to "-Xlinker -<option>", since that
+   forfeits the ability to control via spec strings later.  However,
+   as a special exception, do this translation with -filelist, because
+   otherwise the driver will think there are no input files and quit.
+   (The alternative would be to hack the driver to recognize -filelist
+   specially, but it's simpler to use the translation table.)
+
+   Note that an option name with a prefix that matches another option
+   name, that also takes an argument, needs to be modified so the
+   prefix is different, otherwise a '*' after the shorter option will
+   match with the longer one.
+
+   The SUBTARGET_OPTION_TRANSLATE_TABLE macro, which _must_ be defined
+   in gcc/config/{i386,rs6000}/darwin.h, should contain any additional
+   command-line option translations specific to the particular target
+   architecture.  */
+
+#define TARGET_OPTION_TRANSLATE_TABLE \
+  { "-all_load", "-Zall_load" },  \
+  { "-allowable_client", "-Zallowable_client" },  \
+  { "-arch_errors_fatal", "-Zarch_errors_fatal" },  \
+  { "-bind_at_load", "-Zbind_at_load" },  \
+  { "-bundle", "-Zbundle" },  \
+  { "-bundle_loader", "-Zbundle_loader" },  \
+  { "-weak_reference_mismatches", "-Zweak_reference_mismatches" },  \
+  { "-dead_strip", "-Zdead_strip" }, \
+  { "-no_dead_strip_inits_and_terms", "-Zno_dead_strip_inits_and_terms" }, \
+  { "-dependency-file", "-MF" }, \
+  { "-dylib_file", "-Zdylib_file" }, \
+  { "-dynamic", "-Zdynamic" },  \
+  { "-dynamiclib", "-Zdynamiclib" },  \
+  { "-exported_symbols_list", "-Zexported_symbols_list" },  \
+  { "-gfull", "-g -fno-eliminate-unused-debug-symbols" }, \
+  { "-gused", "-g -feliminate-unused-debug-symbols" }, \
+  { "-segaddr", "-Zsegaddr" }, \
+  { "-segs_read_only_addr", "-Zsegs_read_only_addr" }, \
+  { "-segs_read_write_addr", "-Zsegs_read_write_addr" }, \
+  { "-seg_addr_table", "-Zseg_addr_table" }, \
+  { "-seg_addr_table_filename", "-Zfn_seg_addr_table_filename" }, \
+  { "-umbrella", "-Zumbrella" }, \
+  { "-fapple-kext", "-fapple-kext -static -Wa,-static" }, \
+  { "-filelist", "-Xlinker -filelist -Xlinker" },  \
+  { "-findirect-virtual-calls", "-fapple-kext" }, \
+  { "-flat_namespace", "-Zflat_namespace" },  \
+  { "-force_cpusubtype_ALL", "-Zforce_cpusubtype_ALL" },  \
+  { "-force_flat_namespace", "-Zforce_flat_namespace" },  \
+  { "-framework", "-Xlinker -framework -Xlinker" },  \
+  { "-fterminated-vtables", "-fapple-kext" }, \
+  { "-image_base", "-Zimage_base" },  \
+  { "-init", "-Zinit" },  \
+  { "-install_name", "-Zinstall_name" },  \
+  { "-mkernel", "-mkernel -static -Wa,-static" }, \
+  { "-multiply_defined_unused", "-Zmultiplydefinedunused" },  \
+  { "-multiply_defined", "-Zmultiply_defined" },  \
+  { "-multi_module", "-Zmulti_module" },  \
+  { "-static", "-static -Wa,-static" },  \
+  { "-shared", "-Zdynamiclib" }, \
+  { "-single_module", "-Zsingle_module" },  \
+  { "-unexported_symbols_list", "-Zunexported_symbols_list" }, \
+  SUBTARGET_OPTION_TRANSLATE_TABLE
+
+#define SUBSUBTARGET_OVERRIDE_OPTIONS					\
+  do {									\
+    darwin_override_options ();						\
+  } while (0)
 
-/* Machine dependent cpp options.  */
+/* These compiler options take n arguments.  */
+
+#undef  WORD_SWITCH_TAKES_ARG
+#define WORD_SWITCH_TAKES_ARG(STR)              \
+  (DEFAULT_WORD_SWITCH_TAKES_ARG (STR) ? 1 :    \
+   !strcmp (STR, "Zallowable_client") ? 1 :     \
+   !strcmp (STR, "arch") ? 1 :                  \
+   !strcmp (STR, "arch_only") ? 1 :             \
+   !strcmp (STR, "Zbundle_loader") ? 1 :        \
+   !strcmp (STR, "client_name") ? 1 :           \
+   !strcmp (STR, "compatibility_version") ? 1 : \
+   !strcmp (STR, "current_version") ? 1 :       \
+   !strcmp (STR, "Zdylib_file") ? 1 :           \
+   !strcmp (STR, "Zexported_symbols_list") ? 1 : \
+   !strcmp (STR, "Zimage_base") ? 1 :           \
+   !strcmp (STR, "Zinit") ? 1 :                 \
+   !strcmp (STR, "Zinstall_name") ? 1 :         \
+   !strcmp (STR, "Zmultiplydefinedunused") ? 1 : \
+   !strcmp (STR, "Zmultiply_defined") ? 1 :     \
+   !strcmp (STR, "precomp-trustfile") ? 1 :     \
+   !strcmp (STR, "read_only_relocs") ? 1 :      \
+   !strcmp (STR, "sectcreate") ? 3 :            \
+   !strcmp (STR, "sectorder") ? 3 :             \
+   !strcmp (STR, "Zsegaddr") ? 2 :              \
+   !strcmp (STR, "Zsegs_read_only_addr") ? 1 :  \
+   !strcmp (STR, "Zsegs_read_write_addr") ? 1 : \
+   !strcmp (STR, "Zseg_addr_table") ? 1 :       \
+   !strcmp (STR, "Zfn_seg_addr_table_filename") ? 1 :\
+   !strcmp (STR, "seg1addr") ? 1 :              \
+   !strcmp (STR, "segprot") ? 3 :               \
+   !strcmp (STR, "sub_library") ? 1 :           \
+   !strcmp (STR, "sub_umbrella") ? 1 :          \
+   !strcmp (STR, "Zumbrella") ? 1 :             \
+   !strcmp (STR, "undefined") ? 1 :             \
+   !strcmp (STR, "Zunexported_symbols_list") ? 1 : \
+   !strcmp (STR, "Zweak_reference_mismatches") ? 1 : \
+   !strcmp (STR, "pagezero_size") ? 1 :         \
+   !strcmp (STR, "segs_read_only_addr") ? 1 :   \
+   !strcmp (STR, "segs_read_write_addr") ? 1 :  \
+   !strcmp (STR, "sectalign") ? 3 :             \
+   !strcmp (STR, "sectobjectsymbols") ? 2 :     \
+   !strcmp (STR, "segcreate") ? 3 :             \
+   !strcmp (STR, "dylinker_install_name") ? 1 : \
+   0)
+
+#define SUBTARGET_C_COMMON_OVERRIDE_OPTIONS do {                        \
+    if (flag_mkernel || flag_apple_kext)				\
+      {									\
+	if (flag_use_cxa_atexit == 2)					\
+	  flag_use_cxa_atexit = 0;					\
+	/* kexts should always be built without the coalesced sections	\
+	   because the kernel loader doesn't grok such sections.  */	\
+	flag_weak = 0;							\
+	/* No RTTI in kexts.  */					\
+	flag_rtti = 0;							\
+      }									\
+  } while (0)
 
-/* The sequence here allows us to get a more specific version number
-   glued into __APPLE_CC__.  Normally this number would be updated as
-   part of submitting to a release engineering organization.  */
+/* Machine dependent cpp options.  Don't add more options here, add
+   them to darwin_cpp_builtins in darwin-c.c.  */
 
-#ifndef APPLE_CC
-#define APPLE_CC 999
+#undef	CPP_SPEC
+#define CPP_SPEC "%{static:%{!dynamic:-D__STATIC__}}%{!static:-D__DYNAMIC__}" \
+	" %{pthread:-D_REENTRANT}"
+
+/* This is mostly a clone of the standard LINK_COMMAND_SPEC, plus
+   precomp, libtool, and fat build additions.  Also we
+   don't specify a second %G after %L because libSystem is
+   self-contained and doesn't need to link against libgcc.a.  */
+/* In general, random Darwin linker flags should go into LINK_SPEC
+   instead of LINK_COMMAND_SPEC.  The command spec is better for
+   specifying the handling of options understood by generic Unix
+   linkers, and for positional arguments like libraries.  */
+#define LINK_COMMAND_SPEC "\
+%{!fdump=*:%{!fsyntax-only:%{!c:%{!M:%{!MM:%{!E:%{!S:\
+    %(linker) %l %X %{d} %{s} %{t} %{Z} %{u*} \
+    %{A} %{e*} %{m} %{r} %{x} \
+    %{o*}%{!o:-o a.out} \
+    %{!A:%{!nostdlib:%{!nostartfiles:%S}}} \
+    %{L*} %{fopenmp:%:include(libgomp.spec)%(link_gomp)}   \
+    %(link_libgcc) %o %{fprofile-arcs|fprofile-generate|coverage:-lgcov} \
+    %{!nostdlib:%{!nodefaultlibs:%(link_ssp) %G %L}} \
+    %{!A:%{!nostdlib:%{!nostartfiles:%E}}} %{T*} %{F*} }}}}}}}\n\
+%{!fdump=*:%{!fsyntax-only:%{!c:%{!M:%{!MM:%{!E:%{!S:\
+    %{.c|.cc|.C|.cpp|.cp|.c++|.cxx|.CPP|.m|.mm: \
+    %{gdwarf-2:%{!gstabs*:%{!g0: dsymutil %{o*:%*}%{!o:a.out}}}}}}}}}}}}"
+
+#ifdef TARGET_SYSTEM_ROOT
+#define LINK_SYSROOT_SPEC \
+  "%{isysroot*:-syslibroot %*;:-syslibroot " TARGET_SYSTEM_ROOT "}"
+#else
+#define LINK_SYSROOT_SPEC "%{isysroot*:-syslibroot %*}"
 #endif
 
-#define STRINGIFY_THIS(x) # x
-#define REALLY_STRINGIFY(x) STRINGIFY_THIS(x)
+/* Please keep the random linker options in alphabetical order (modulo
+   'Z' and 'no' prefixes). Note that options taking arguments may appear
+   multiple times on a command line with different arguments each time,
+   so put a * after their names so all of them get passed.  */
+#define LINK_SPEC  \
+  "%{static}%{!static:-dynamic} \
+   %{fgnu-runtime:%:replace-outfile(-lobjc -lobjc-gnu)}\
+   %{static|static-libgfortran:%:replace-outfile(-lgfortran libgfortran.a%s)}\
+   %{!Zdynamiclib: \
+     %{Zforce_cpusubtype_ALL:-arch %(darwin_arch) -force_cpusubtype_ALL} \
+     %{!Zforce_cpusubtype_ALL:-arch %(darwin_subarch)} \
+     %{Zbundle:-bundle} \
+     %{Zbundle_loader*:-bundle_loader %*} \
+     %{client_name*} \
+     %{compatibility_version*:%e-compatibility_version only allowed with -dynamiclib\
+} \
+     %{current_version*:%e-current_version only allowed with -dynamiclib} \
+     %{Zforce_flat_namespace:-force_flat_namespace} \
+     %{Zinstall_name*:%e-install_name only allowed with -dynamiclib} \
+     %{keep_private_externs} \
+     %{private_bundle} \
+    } \
+   %{Zdynamiclib: -dylib \
+     %{Zbundle:%e-bundle not allowed with -dynamiclib} \
+     %{Zbundle_loader*:%e-bundle_loader not allowed with -dynamiclib} \
+     %{client_name*:%e-client_name not allowed with -dynamiclib} \
+     %{compatibility_version*:-dylib_compatibility_version %*} \
+     %{current_version*:-dylib_current_version %*} \
+     %{Zforce_cpusubtype_ALL:-arch %(darwin_arch)} \
+     %{!Zforce_cpusubtype_ALL: -arch %(darwin_subarch)} \
+     %{Zforce_flat_namespace:%e-force_flat_namespace not allowed with -dynamiclib} \
+     %{Zinstall_name*:-dylib_install_name %*} \
+     %{keep_private_externs:%e-keep_private_externs not allowed with -dynamiclib} \
+     %{private_bundle:%e-private_bundle not allowed with -dynamiclib} \
+    } \
+   %{Zall_load:-all_load} \
+   %{Zallowable_client*:-allowable_client %*} \
+   %{Zbind_at_load:-bind_at_load} \
+   %{Zarch_errors_fatal:-arch_errors_fatal} \
+   %{Zdead_strip:-dead_strip} \
+   %{Zno_dead_strip_inits_and_terms:-no_dead_strip_inits_and_terms} \
+   %{Zdylib_file*:-dylib_file %*} \
+   %{Zdynamic:-dynamic}\
+   %{Zexported_symbols_list*:-exported_symbols_list %*} \
+   %{Zflat_namespace:-flat_namespace} \
+   %{headerpad_max_install_names*} \
+   %{Zimage_base*:-image_base %*} \
+   %{Zinit*:-init %*} \
+   %{!mmacosx-version-min=*:-macosx_version_min %(darwin_minversion)} \
+   %{mmacosx-version-min=*:-macosx_version_min %*} \
+   %{nomultidefs} \
+   %{Zmulti_module:-multi_module} %{Zsingle_module:-single_module} \
+   %{Zmultiply_defined*:-multiply_defined %*} \
+   %{!Zmultiply_defined*:%{shared-libgcc: \
+     %:version-compare(< 10.5 mmacosx-version-min= -multiply_defined) \
+     %:version-compare(< 10.5 mmacosx-version-min= suppress)}} \
+   %{Zmultiplydefinedunused*:-multiply_defined_unused %*} \
+   %{fpie:-pie} \
+   %{prebind} %{noprebind} %{nofixprebinding} %{prebind_all_twolevel_modules} \
+   %{read_only_relocs} \
+   %{sectcreate*} %{sectorder*} %{seg1addr*} %{segprot*} \
+   %{Zsegaddr*:-segaddr %*} \
+   %{Zsegs_read_only_addr*:-segs_read_only_addr %*} \
+   %{Zsegs_read_write_addr*:-segs_read_write_addr %*} \
+   %{Zseg_addr_table*: -seg_addr_table %*} \
+   %{Zfn_seg_addr_table_filename*:-seg_addr_table_filename %*} \
+   %{sub_library*} %{sub_umbrella*} \
+   " LINK_SYSROOT_SPEC " \
+   %{twolevel_namespace} %{twolevel_namespace_hints} \
+   %{Zumbrella*: -umbrella %*} \
+   %{undefined*} \
+   %{Zunexported_symbols_list*:-unexported_symbols_list %*} \
+   %{Zweak_reference_mismatches*:-weak_reference_mismatches %*} \
+   %{!Zweak_reference_mismatches*:-weak_reference_mismatches non-weak} \
+   %{X} \
+   %{y*} \
+   %{w} \
+   %{pagezero_size*} %{segs_read_*} %{seglinkedit} %{noseglinkedit}  \
+   %{sectalign*} %{sectobjectsymbols*} %{segcreate*} %{whyload} \
+   %{whatsloaded} %{dylinker_install_name*} \
+   %{dylinker} %{Mach} "
 
-#undef	CPP_SPEC
-#define CPP_SPEC "-D__APPLE_CC__=" REALLY_STRINGIFY(APPLE_CC) "	\
-		  %{static:-D__STATIC__}%{!static:-D__DYNAMIC__}"
 
 /* Machine dependent libraries.  */
 
-#undef	LIB_SPEC
 #define LIB_SPEC "%{!static:-lSystem}"
 
-/* We specify crt0.o as -lcrt0.o so that ld will search the library path. */
+/* Support -mmacosx-version-min by supplying different (stub) libgcc_s.dylib
+   libraries to link against, and by not linking against libgcc_s on
+   earlier-than-10.3.9.
+
+   Note that by default, -lgcc_eh is not linked against!  This is
+   because in a future version of Darwin the EH frame information may
+   be in a new format, or the fallback routine might be changed; if
+   you want to explicitly link against the static version of those
+   routines, because you know you don't need to unwind through system
+   libraries, you need to explicitly say -static-libgcc.
+
+   If it is linked against, it has to be before -lgcc, because it may
+   need symbols from -lgcc.  */
+#undef REAL_LIBGCC_SPEC
+#define REAL_LIBGCC_SPEC						   \
+   "%{static-libgcc|static: -lgcc_eh -lgcc;				   \
+      shared-libgcc|fexceptions|fgnu-runtime:				   \
+       %:version-compare(!> 10.5 mmacosx-version-min= -lgcc_s.10.4)	   \
+       %:version-compare(>= 10.5 mmacosx-version-min= -lgcc_s.10.5)	   \
+       -lgcc;								   \
+      :%:version-compare(>< 10.3.9 10.5 mmacosx-version-min= -lgcc_s.10.4) \
+       %:version-compare(>= 10.5 mmacosx-version-min= -lgcc_s.10.5)	   \
+       -lgcc}"
+
+/* We specify crt0.o as -lcrt0.o so that ld will search the library path.
+
+   crt3.o provides __cxa_atexit on systems that don't have it.  Since
+   it's only used with C++, which requires passing -shared-libgcc, key
+   off that to avoid unnecessarily adding a destructor to every
+   powerpc program built.  */
+
+#undef  STARTFILE_SPEC
+#define STARTFILE_SPEC							    \
+  "%{Zdynamiclib: %(darwin_dylib1) }					    \
+   %{!Zdynamiclib:%{Zbundle:%{!static:-lbundle1.o}}			    \
+     %{!Zbundle:%{pg:%{static:-lgcrt0.o}				    \
+                     %{!static:%{object:-lgcrt0.o}			    \
+                               %{!object:%{preload:-lgcrt0.o}		    \
+                                 %{!preload:-lgcrt1.o %(darwin_crt2)}}}}    \
+                %{!pg:%{static:-lcrt0.o}				    \
+                      %{!static:%{object:-lcrt0.o}			    \
+                                %{!object:%{preload:-lcrt0.o}		    \
+                                  %{!preload: %(darwin_crt1)		    \
+					      %(darwin_crt2)}}}}}}	    \
+  %{shared-libgcc:%:version-compare(< 10.5 mmacosx-version-min= crt3.o%s)}"
+
+/* The native Darwin linker doesn't necessarily place files in the order
+   that they're specified on the link line.  Thus, it is pointless
+   to put anything in ENDFILE_SPEC.  */
+/* #define ENDFILE_SPEC "" */
+
+#define DARWIN_EXTRA_SPECS						\
+  { "darwin_crt1", DARWIN_CRT1_SPEC },					\
+  { "darwin_dylib1", DARWIN_DYLIB1_SPEC },				\
+  { "darwin_minversion", DARWIN_MINVERSION_SPEC },
+
+#define DARWIN_DYLIB1_SPEC						\
+  "%:version-compare(!> 10.5 mmacosx-version-min= -ldylib1.o)		\
+   %:version-compare(>= 10.5 mmacosx-version-min= -ldylib1.10.5.o)"
+
+#define DARWIN_CRT1_SPEC						\
+  "%:version-compare(!> 10.5 mmacosx-version-min= -lcrt1.o)		\
+   %:version-compare(>= 10.5 mmacosx-version-min= -lcrt1.10.5.o)"
+
+/* Default Darwin ASM_SPEC, very simple.  */
+#define ASM_SPEC "-arch %(darwin_arch) \
+  %{Zforce_cpusubtype_ALL:-force_cpusubtype_ALL}"
+
+/* We still allow output of STABS.  */
+
+#define DBX_DEBUGGING_INFO 1
+
+#define DWARF2_DEBUGGING_INFO
+#define PREFERRED_DEBUGGING_TYPE DBX_DEBUG
 
-#undef	STARTFILE_SPEC
-#define STARTFILE_SPEC  \
-  "%{pg:%{static:-lgcrt0.o}%{!static:-lgcrt1.o}} \
-    %{!pg:%{static:-lcrt0.o}%{!static:-lcrt1.o}}"
+#define DEBUG_FRAME_SECTION	"__DWARF,__debug_frame,regular,debug"
+#define DEBUG_INFO_SECTION	"__DWARF,__debug_info,regular,debug"
+#define DEBUG_ABBREV_SECTION	"__DWARF,__debug_abbrev,regular,debug"
+#define DEBUG_ARANGES_SECTION	"__DWARF,__debug_aranges,regular,debug"
+#define DEBUG_MACINFO_SECTION	"__DWARF,__debug_macinfo,regular,debug"
+#define DEBUG_LINE_SECTION	"__DWARF,__debug_line,regular,debug"
+#define DEBUG_LOC_SECTION	"__DWARF,__debug_loc,regular,debug"
+#define DEBUG_PUBNAMES_SECTION	"__DWARF,__debug_pubnames,regular,debug"
+#define DEBUG_PUBTYPES_SECTION	"__DWARF,__debug_pubtypes,regular,debug"
+#define DEBUG_STR_SECTION	"__DWARF,__debug_str,regular,debug"
+#define DEBUG_RANGES_SECTION	"__DWARF,__debug_ranges,regular,debug"
 
-#undef	DOLLARS_IN_IDENTIFIERS
-#define DOLLARS_IN_IDENTIFIERS 2
+/* When generating stabs debugging, use N_BINCL entries.  */
 
-/* Allow #sccs (but don't do anything). */
+#define DBX_USE_BINCL
 
-#define SCCS_DIRECTIVE
+/* There is no limit to the length of stabs strings.  */
 
-/* We use Dbx symbol format.  */
+#define DBX_CONTIN_LENGTH 0
 
-#define DBX_DEBUGGING_INFO
+/* gdb needs a null N_SO at the end of each file for scattered loading.  */
 
-/* Also enable Dwarf 2 as an option.  */
+#define DBX_OUTPUT_NULL_N_SO_AT_MAIN_SOURCE_FILE_END
 
-#define DWARF2_DEBUGGING_INFO
+/* GCC's definition of 'one_only' is the same as its definition of 'weak'.  */
+#define MAKE_DECL_ONE_ONLY(DECL) (DECL_WEAK (DECL) = 1)
 
-#define PREFERRED_DEBUGGING_TYPE DBX_DEBUG
+/* Mach-O supports 'weak imports', and 'weak definitions' in coalesced
+   sections.  machopic_select_section ensures that weak variables go in
+   coalesced sections.  Weak aliases (or any other kind of aliases) are
+   not supported.  Weak symbols that aren't visible outside the .s file
+   are not supported.  */
+#define ASM_WEAKEN_DECL(FILE, DECL, NAME, ALIAS)			\
+  do {									\
+    if (ALIAS)								\
+      {									\
+	warning (0, "alias definitions not supported in Mach-O; ignored");	\
+	break;								\
+      }									\
+ 									\
+    if (! DECL_EXTERNAL (DECL) && TREE_PUBLIC (DECL))			\
+      targetm.asm_out.globalize_label (FILE, NAME);			\
+    if (DECL_EXTERNAL (DECL))						\
+      fputs ("\t.weak_reference ", FILE);				\
+    else if (! lookup_attribute ("weak", DECL_ATTRIBUTES (DECL))	\
+	&& lookup_attribute ("weak_import", DECL_ATTRIBUTES (DECL)))	\
+      break;								\
+    else if (TREE_PUBLIC (DECL))					\
+      fputs ("\t.weak_definition ", FILE);				\
+    else								\
+      break;								\
+    assemble_name (FILE, NAME);						\
+    fputc ('\n', FILE);							\
+  } while (0)
 
-/* When generating stabs debugging, use N_BINCL entries.  */
+/* Darwin has the pthread routines in libSystem, which every program
+   links to, so there's no need for weak-ness for that.  */
+#define GTHREAD_USE_WEAK 0
 
-#define DBX_USE_BINCL
+/* The Darwin linker imposes two limitations on common symbols: they
+   can't have hidden visibility, and they can't appear in dylibs.  As
+   a consequence, we should never use common symbols to represent
+   vague linkage. */
+#undef USE_COMMON_FOR_ONE_ONLY
+#define USE_COMMON_FOR_ONE_ONLY 0
 
-/* There is no limit to the length of stabs strings.  */
+/* The Darwin linker doesn't want coalesced symbols to appear in
+   a static archive's table of contents. */
+#undef TARGET_WEAK_NOT_IN_ARCHIVE_TOC
+#define TARGET_WEAK_NOT_IN_ARCHIVE_TOC 1
 
-#define DBX_CONTIN_LENGTH 0
+/* On Darwin, we don't (at the time of writing) have linkonce sections
+   with names, so it's safe to make the class data not comdat.  */
+#define TARGET_CXX_CLASS_DATA_ALWAYS_COMDAT hook_bool_void_false
 
-/* gdb needs a null N_SO at the end of each file for scattered loading. */
+/* For efficiency, on Darwin the RTTI information that is always
+   emitted in the standard C++ library should not be COMDAT.  */
+#define TARGET_CXX_LIBRARY_RTTI_COMDAT hook_bool_void_false
 
-#undef	DBX_OUTPUT_MAIN_SOURCE_FILE_END
-#define DBX_OUTPUT_MAIN_SOURCE_FILE_END(FILE, FILENAME)			\
-do { text_section ();							\
-     fprintf (FILE,							\
-	      "\t.stabs \"%s\",%d,0,0,Letext\nLetext:\n", "" , N_SO);	\
-   } while (0)
+/* We make exception information linkonce. */
+#undef TARGET_USES_WEAK_UNWIND_INFO
+#define TARGET_USES_WEAK_UNWIND_INFO 1
+
+/* We need to use a nonlocal label for the start of an EH frame: the
+   Darwin linker requires that a coalesced section start with a label.
+   Unfortunately, it also requires that 'debug' sections don't contain
+   labels.  */
+#undef FRAME_BEGIN_LABEL
+#define FRAME_BEGIN_LABEL (for_eh ? "EH_frame" : "Lframe")
+
+/* Emit a label for the FDE corresponding to DECL.  EMPTY means
+   emit a label for an empty FDE. */
+#define TARGET_ASM_EMIT_UNWIND_LABEL darwin_emit_unwind_label
+
+/* Emit a label to separate the exception table.  */
+#define TARGET_ASM_EMIT_EXCEPT_TABLE_LABEL darwin_emit_except_table_label
 
 /* Our profiling scheme doesn't LP labels and counter words.  */
 
-#define NO_PROFILE_COUNTERS
+#define NO_PROFILE_COUNTERS	1
 
 #undef	INIT_SECTION_ASM_OP
 #define INIT_SECTION_ASM_OP
@@ -158,26 +526,25 @@ do { text_section ();							\
 #define TARGET_ASM_CONSTRUCTOR  machopic_asm_out_constructor
 #define TARGET_ASM_DESTRUCTOR   machopic_asm_out_destructor
 
+/* Always prefix with an underscore.  */
+
+#define USER_LABEL_PREFIX "_"
+
+/* A dummy symbol that will be replaced with the function base name.  */
+#define MACHOPIC_FUNCTION_BASE_NAME "<pic base>"
 
 /* Don't output a .file directive.  That is only used by the assembler for
    error reporting.  */
+#undef	TARGET_ASM_FILE_START_FILE_DIRECTIVE
+#define TARGET_ASM_FILE_START_FILE_DIRECTIVE false
 
-#undef	ASM_FILE_START
-#define ASM_FILE_START(FILE)
+#undef  TARGET_ASM_FILE_END
+#define TARGET_ASM_FILE_END darwin_file_end
 
-#undef	ASM_FILE_END
-#define ASM_FILE_END(FILE)					\
-  do {								\
-    machopic_finish (asm_out_file);                             \
-    if (strcmp (lang_hooks.name, "GNU C++") == 0)		\
-      {								\
-	constructor_section ();					\
-	destructor_section ();					\
-	ASM_OUTPUT_ALIGN (FILE, 1);				\
-      }								\
-  } while (0)
+#define ASM_OUTPUT_SKIP(FILE,SIZE)  \
+  fprintf (FILE, "\t.space "HOST_WIDE_INT_PRINT_UNSIGNED"\n", SIZE)
 
-/* Give ObjcC methods pretty symbol names. */
+/* Give ObjC methods pretty symbol names.  */
 
 #undef	OBJC_GEN_METHOD_LABEL
 #define OBJC_GEN_METHOD_LABEL(BUF,IS_INST,CLASS_NAME,CAT_NAME,SEL_NAME,NUM) \
@@ -191,74 +558,104 @@ do { text_section ();							\
 
 /* The RTTI data (e.g., __ti4name) is common and public (and static),
    but it does need to be referenced via indirect PIC data pointers.
-   The machopic_define_name calls are telling the machopic subsystem
+   The machopic_define_symbol calls are telling the machopic subsystem
    that the name *is* defined in this module, so it doesn't need to
    make them indirect.  */
 
 #undef ASM_DECLARE_OBJECT_NAME
 #define ASM_DECLARE_OBJECT_NAME(FILE, NAME, DECL)			\
   do {									\
-    const char *xname = NAME;                                           \
-    if (GET_CODE (XEXP (DECL_RTL (DECL), 0)) != SYMBOL_REF)             \
-      xname = IDENTIFIER_POINTER (DECL_NAME (DECL));                    \
-    if ((TREE_STATIC (DECL)                                             \
-	 && (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL)))               \
-        || DECL_INITIAL (DECL))                                         \
-      machopic_define_name (xname);                                     \
-    if ((TREE_STATIC (DECL)                                             \
-	 && (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL)))               \
-        || DECL_INITIAL (DECL))                                         \
-      ENCODE_SECTION_INFO (DECL);  \
-    ASM_OUTPUT_LABEL (FILE, xname);                                     \
+    const char *xname = NAME;						\
+    if (GET_CODE (XEXP (DECL_RTL (DECL), 0)) != SYMBOL_REF)		\
+      xname = IDENTIFIER_POINTER (DECL_NAME (DECL));			\
+    if (! DECL_WEAK (DECL)						\
+        && ((TREE_STATIC (DECL)						\
+	     && (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL)))		\
+            || DECL_INITIAL (DECL)))					\
+        machopic_define_symbol (DECL_RTL (DECL));			\
+    if ((TREE_STATIC (DECL)						\
+	 && (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL)))		\
+        || DECL_INITIAL (DECL))						\
+      (* targetm.encode_section_info) (DECL, DECL_RTL (DECL), false);	\
+    ASM_OUTPUT_LABEL (FILE, xname);					\
+    /* Darwin doesn't support zero-size objects, so give them a		\
+       byte.  */							\
+    if (tree_low_cst (DECL_SIZE_UNIT (DECL), 1) == 0)			\
+      assemble_zeros (1);						\
   } while (0)
 
-#define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL)                     \
+#define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL)			\
   do {									\
-    const char *xname = NAME;                                           \
-    if (GET_CODE (XEXP (DECL_RTL (DECL), 0)) != SYMBOL_REF)             \
-      xname = IDENTIFIER_POINTER (DECL_NAME (DECL));                    \
-    if ((TREE_STATIC (DECL)                                             \
-	 && (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL)))               \
-        || DECL_INITIAL (DECL))                                         \
-      machopic_define_name (xname);                                     \
-    if ((TREE_STATIC (DECL)                                             \
-	 && (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL)))               \
-        || DECL_INITIAL (DECL))                                         \
-      ENCODE_SECTION_INFO (DECL);					\
-    ASM_OUTPUT_LABEL (FILE, xname);                                     \
-    /* Avoid generating stubs for functions we've just defined by	\
-       outputting any required stub name label now.  */			\
-    machopic_output_possible_stub_label (FILE, xname);			\
+    const char *xname = NAME;						\
+    if (GET_CODE (XEXP (DECL_RTL (DECL), 0)) != SYMBOL_REF)		\
+      xname = IDENTIFIER_POINTER (DECL_NAME (DECL));			\
+    if (! DECL_WEAK (DECL)						\
+        && ((TREE_STATIC (DECL)						\
+	     && (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL)))		\
+            || DECL_INITIAL (DECL)))					\
+        machopic_define_symbol (DECL_RTL (DECL));			\
+    if ((TREE_STATIC (DECL)						\
+	 && (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL)))		\
+        || DECL_INITIAL (DECL))						\
+      (* targetm.encode_section_info) (DECL, DECL_RTL (DECL), false);	\
+    ASM_OUTPUT_LABEL (FILE, xname);					\
+  } while (0)
+
+#define ASM_DECLARE_CONSTANT_NAME(FILE, NAME, EXP, SIZE)	\
+  do {								\
+    ASM_OUTPUT_LABEL (FILE, NAME);				\
+    /* Darwin doesn't support zero-size objects, so give them a	\
+       byte.  */						\
+    if ((SIZE) == 0)						\
+      assemble_zeros (1);					\
   } while (0)
 
 /* Wrap new method names in quotes so the assembler doesn't gag.
    Make Objective-C internal symbols local.  */
 
 #undef	ASM_OUTPUT_LABELREF
-#define ASM_OUTPUT_LABELREF(FILE,NAME)	\
-  do {									\
-       STRIP_NAME_ENCODING (NAME, NAME);  \
-       if (NAME[0] == '&' || NAME[0] == '*')				\
-         {								\
-           int len = strlen (NAME);					\
-	   if (len > 6 && !strcmp ("$stub", NAME + len - 5))		\
-	     machopic_validate_stub_or_non_lazy_ptr (NAME, 1);		\
-	   else if (len > 7 && !strcmp ("$stub\"", NAME + len - 6))	\
-	     machopic_validate_stub_or_non_lazy_ptr (NAME, 1);		\
-	   else if (len > 14 && !strcmp ("$non_lazy_ptr", NAME + len - 13)) \
-	     machopic_validate_stub_or_non_lazy_ptr (NAME, 0);		\
-	   fputs (&NAME[1], FILE); \
-	 } \
-       else if (NAME[0] == '+' || NAME[0] == '-')   \
-         fprintf (FILE, "\"%s\"", NAME); \
-       else if (!strncmp (NAME, "_OBJC_", 6))  \
-         fprintf (FILE, "L%s", NAME);   \
-       else if (!strncmp (NAME, ".objc_class_name_", 17))		\
-	 fprintf (FILE, "%s", NAME);					\
-       else								\
-         fprintf (FILE, "_%s", NAME);					\
+#define ASM_OUTPUT_LABELREF(FILE,NAME)					     \
+  do {									     \
+       const char *xname = (NAME);					     \
+       if (! strcmp (xname, MACHOPIC_FUNCTION_BASE_NAME))		     \
+         machopic_output_function_base_name(FILE);                           \
+       else if (xname[0] == '&' || xname[0] == '*')			     \
+         {								     \
+           int len = strlen (xname);					     \
+	   if (len > 6 && !strcmp ("$stub", xname + len - 5))		     \
+	     machopic_validate_stub_or_non_lazy_ptr (xname);		     \
+	   else if (len > 7 && !strcmp ("$stub\"", xname + len - 6))	     \
+	     machopic_validate_stub_or_non_lazy_ptr (xname);		     \
+	   else if (len > 14 && !strcmp ("$non_lazy_ptr", xname + len - 13)) \
+	     machopic_validate_stub_or_non_lazy_ptr (xname);		     \
+	   else if (len > 15 && !strcmp ("$non_lazy_ptr\"", xname + len - 14)) \
+	     machopic_validate_stub_or_non_lazy_ptr (xname);		     \
+	   if (xname[1] != '"' && name_needs_quotes (&xname[1]))	     \
+	     fprintf (FILE, "\"%s\"", &xname[1]);			     \
+	   else								     \
+	     fputs (&xname[1], FILE); 					     \
+	 }								     \
+       else if (xname[0] == '+' || xname[0] == '-')			     \
+         fprintf (FILE, "\"%s\"", xname);				     \
+       else if (!strncmp (xname, "_OBJC_", 6))				     \
+         fprintf (FILE, "L%s", xname);					     \
+       else if (!strncmp (xname, ".objc_class_name_", 17))		     \
+	 fprintf (FILE, "%s", xname);					     \
+       else if (xname[0] != '"' && name_needs_quotes (xname))		     \
+	 fprintf (FILE, "\"%s\"", xname);				     \
+       else								     \
+         asm_fprintf (FILE, "%U%s", xname);				     \
   } while (0)
 
+/* Output before executable code.  */
+#undef TEXT_SECTION_ASM_OP
+#define TEXT_SECTION_ASM_OP "\t.text"
+
+/* Output before writable data.  */
+
+#undef DATA_SECTION_ASM_OP
+#define DATA_SECTION_ASM_OP "\t.data"
+
 #undef	ALIGN_ASM_OP
 #define ALIGN_ASM_OP		".align"
 
@@ -270,394 +667,58 @@ do { text_section ();							\
 /* Ensure correct alignment of bss data.  */
 
 #undef	ASM_OUTPUT_ALIGNED_DECL_LOCAL
-#define ASM_OUTPUT_ALIGNED_DECL_LOCAL(FILE, DECL, NAME, SIZE, ALIGN) \
-  do {  \
-    fputs (".lcomm ", (FILE));				\
-    assemble_name ((FILE), (NAME));			\
-    fprintf ((FILE), ",%u,%u\n", (SIZE), floor_log2 ((ALIGN) / BITS_PER_UNIT)); \
-    if ((DECL) && ((TREE_STATIC (DECL)                                             \
-	 && (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL)))               \
-        || DECL_INITIAL (DECL)))                                         \
-      ENCODE_SECTION_INFO (DECL);  \
-    if ((DECL) && ((TREE_STATIC (DECL)                                             \
-	 && (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL)))               \
-        || DECL_INITIAL (DECL)))                                         \
-      machopic_define_name (NAME);                                     \
+#define ASM_OUTPUT_ALIGNED_DECL_LOCAL(FILE, DECL, NAME, SIZE, ALIGN)	\
+  do {									\
+    unsigned HOST_WIDE_INT _new_size = SIZE;				\
+    fputs (".lcomm ", (FILE));						\
+    assemble_name ((FILE), (NAME));					\
+    if (_new_size == 0) _new_size = 1;					\
+    fprintf ((FILE), ","HOST_WIDE_INT_PRINT_UNSIGNED",%u\n", _new_size,	\
+	     floor_log2 ((ALIGN) / BITS_PER_UNIT));			\
+    if ((DECL) && ((TREE_STATIC (DECL)					\
+	 && (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL)))		\
+        || DECL_INITIAL (DECL)))					\
+      {									\
+	(* targetm.encode_section_info) (DECL, DECL_RTL (DECL), false);	\
+	machopic_define_symbol (DECL_RTL (DECL));			\
+      }									\
   } while (0)
 
-/* Output nothing for #ident.  */
-
-#undef	ASM_OUTPUT_IDENT
-#define ASM_OUTPUT_IDENT(FILE, NAME)
-
-/* The maximum alignment which the object file format can support.
-   For Mach-O, this is 2^15.  */
+/* The maximum alignment which the object file format can support in
+   bits.  For Mach-O, this is 2^15 bytes.  */
 
 #undef	MAX_OFILE_ALIGNMENT
-#define MAX_OFILE_ALIGNMENT 0x8000
-
-/* Create new Mach-O sections. */
-
-#undef	SECTION_FUNCTION
-#define SECTION_FUNCTION(FUNCTION, SECTION, DIRECTIVE, OBJC)		\
-extern void FUNCTION PARAMS ((void));					\
-void									\
-FUNCTION ()								\
-{									\
-  if (in_section != SECTION)						\
-    {									\
-      if (OBJC)								\
-	objc_section_init ();						\
-      data_section ();							\
-      if (asm_out_file)							\
-	fprintf (asm_out_file, "%s\n", DIRECTIVE);			\
-      in_section = SECTION;						\
-    }									\
-}									\
-
-#define ALIAS_SECTION(enum_value, alias_name) 				\
-do { if (!strcmp (alias_name, name))					\
-       section_alias[enum_value] = (alias ? get_identifier (alias) : 0);  \
-   } while (0)
-
-/* Darwin uses many types of special sections.  */
-
-#undef	EXTRA_SECTIONS
-#define EXTRA_SECTIONS					\
-  in_const, in_const_data, in_cstring, in_literal4, in_literal8,	\
-  in_constructor, in_destructor, in_mod_init, in_mod_term,		\
-  in_objc_class, in_objc_meta_class, in_objc_category,	\
-  in_objc_class_vars, in_objc_instance_vars,		\
-  in_objc_cls_meth, in_objc_inst_meth,			\
-  in_objc_cat_cls_meth, in_objc_cat_inst_meth,		\
-  in_objc_selector_refs,				\
-  in_objc_selector_fixup,				\
-  in_objc_symbols, in_objc_module_info,			\
-  in_objc_protocol, in_objc_string_object,		\
-  in_objc_constant_string_object,			\
-  in_objc_class_names, in_objc_meth_var_names,		\
-  in_objc_meth_var_types, in_objc_cls_refs, 		\
-  in_machopic_nl_symbol_ptr,				\
-  in_machopic_lazy_symbol_ptr,				\
-  in_machopic_symbol_stub,				\
-  in_machopic_picsymbol_stub,				\
-  in_darwin_exception, in_darwin_eh_frame,		\
-  num_sections
-
-#undef	EXTRA_SECTION_FUNCTIONS
-#define EXTRA_SECTION_FUNCTIONS			\
-static void objc_section_init PARAMS ((void));	\
-SECTION_FUNCTION (const_section,		\
-                  in_const,			\
-                  ".const", 0)			\
-SECTION_FUNCTION (const_data_section,		\
-                  in_const_data,		\
-                  ".const_data", 0)		\
-SECTION_FUNCTION (cstring_section,		\
-		  in_cstring,			\
-		  ".cstring", 0)		\
-SECTION_FUNCTION (literal4_section,		\
-		  in_literal4,			\
-		  ".literal4", 0)		\
-SECTION_FUNCTION (literal8_section,		\
-		  in_literal8,			\
-		  ".literal8", 0)		\
-SECTION_FUNCTION (constructor_section,		\
-		  in_constructor,		\
-		  ".constructor", 0)		\
-SECTION_FUNCTION (mod_init_section,		\
-		  in_mod_init,			\
-		  ".mod_init_func", 0)	\
-SECTION_FUNCTION (mod_term_section, \
-		  in_mod_term,			\
-		  ".mod_term_func", 0)	\
-SECTION_FUNCTION (destructor_section,		\
-		  in_destructor,		\
-		  ".destructor", 0)		\
-SECTION_FUNCTION (objc_class_section,		\
-		  in_objc_class,		\
-		  ".objc_class", 1)		\
-SECTION_FUNCTION (objc_meta_class_section,	\
-		  in_objc_meta_class,		\
-		  ".objc_meta_class", 1)	\
-SECTION_FUNCTION (objc_category_section,	\
-		  in_objc_category,		\
-		".objc_category", 1)		\
-SECTION_FUNCTION (objc_class_vars_section,	\
-		  in_objc_class_vars,		\
-		  ".objc_class_vars", 1)	\
-SECTION_FUNCTION (objc_instance_vars_section,	\
-		  in_objc_instance_vars,	\
-		  ".objc_instance_vars", 1)	\
-SECTION_FUNCTION (objc_cls_meth_section,	\
-		  in_objc_cls_meth,		\
-		  ".objc_cls_meth", 1)	\
-SECTION_FUNCTION (objc_inst_meth_section,	\
-		  in_objc_inst_meth,		\
-		  ".objc_inst_meth", 1)	\
-SECTION_FUNCTION (objc_cat_cls_meth_section,	\
-		  in_objc_cat_cls_meth,		\
-		  ".objc_cat_cls_meth", 1)	\
-SECTION_FUNCTION (objc_cat_inst_meth_section,	\
-		  in_objc_cat_inst_meth,	\
-		  ".objc_cat_inst_meth", 1)	\
-SECTION_FUNCTION (objc_selector_refs_section,	\
-		  in_objc_selector_refs,	\
-		  ".objc_message_refs", 1)	\
-SECTION_FUNCTION (objc_selector_fixup_section,	\
-		  in_objc_selector_fixup,	\
-		  ".section __OBJC, __sel_fixup", 1)	\
-SECTION_FUNCTION (objc_symbols_section,		\
-		  in_objc_symbols,		\
-		  ".objc_symbols", 1)	\
-SECTION_FUNCTION (objc_module_info_section,	\
-		  in_objc_module_info,		\
-		  ".objc_module_info", 1)	\
-SECTION_FUNCTION (objc_protocol_section,	\
-		  in_objc_protocol,		\
-		  ".objc_protocol", 1)	\
-SECTION_FUNCTION (objc_string_object_section,	\
-		  in_objc_string_object,	\
-		  ".objc_string_object", 1)	\
-SECTION_FUNCTION (objc_constant_string_object_section,	\
-		  in_objc_constant_string_object,	\
-		  ".section __OBJC, __cstring_object", 1)	\
-SECTION_FUNCTION (objc_class_names_section,	\
-		in_objc_class_names,		\
-		".objc_class_names", 1)	\
-SECTION_FUNCTION (objc_meth_var_names_section,	\
-		in_objc_meth_var_names,		\
-		".objc_meth_var_names", 1)	\
-SECTION_FUNCTION (objc_meth_var_types_section,	\
-		in_objc_meth_var_types,		\
-		".objc_meth_var_types", 1)	\
-SECTION_FUNCTION (objc_cls_refs_section,	\
-		in_objc_cls_refs,		\
-		".objc_cls_refs", 1)		\
-						\
-SECTION_FUNCTION (machopic_lazy_symbol_ptr_section,	\
-		in_machopic_lazy_symbol_ptr,		\
-		".lazy_symbol_pointer", 0)      	\
-SECTION_FUNCTION (machopic_nl_symbol_ptr_section,	\
-		in_machopic_nl_symbol_ptr,		\
-		".non_lazy_symbol_pointer", 0)      	\
-SECTION_FUNCTION (machopic_symbol_stub_section,		\
-		in_machopic_symbol_stub,		\
-		".symbol_stub", 0)      		\
-SECTION_FUNCTION (machopic_picsymbol_stub_section,	\
-		in_machopic_picsymbol_stub,		\
-		".picsymbol_stub", 0)      		\
-SECTION_FUNCTION (darwin_exception_section,		\
-		in_darwin_exception,			\
-		".section __TEXT,__gcc_except_tab", 0)	\
-SECTION_FUNCTION (darwin_eh_frame_section,		\
-		in_darwin_eh_frame,			\
-		".section __TEXT,__eh_frame", 0)	\
-							\
-static void					\
-objc_section_init ()				\
-{						\
-  static int been_here = 0;			\
-						\
-  if (been_here == 0)				\
-    {						\
-      been_here = 1;				\
-          /* written, cold -> hot */		\
-      objc_cat_cls_meth_section ();		\
-      objc_cat_inst_meth_section ();		\
-      objc_string_object_section ();		\
-      objc_constant_string_object_section ();	\
-      objc_selector_refs_section ();		\
-      objc_selector_fixup_section ();		\
-      objc_cls_refs_section ();			\
-      objc_class_section ();			\
-      objc_meta_class_section ();		\
-          /* shared, hot -> cold */    		\
-      objc_cls_meth_section ();			\
-      objc_inst_meth_section ();		\
-      objc_protocol_section ();			\
-      objc_class_names_section ();		\
-      objc_meth_var_types_section ();		\
-      objc_meth_var_names_section ();		\
-      objc_category_section ();			\
-      objc_class_vars_section ();		\
-      objc_instance_vars_section ();		\
-      objc_module_info_section ();		\
-      objc_symbols_section ();			\
-    }						\
-} 						\
-static tree section_alias[(int) num_sections];	\
-static void try_section_alias PARAMS ((void));	\
-static void try_section_alias () 		\
-{						\
-    if (section_alias[in_section] && asm_out_file) \
-      fprintf (asm_out_file, "%s\n",		\
-	       IDENTIFIER_POINTER (section_alias[in_section]));	\
-}      						\
-
-#if 0
-static void alias_section PARAMS ((const char *, const char *)); \
-static void alias_section (name, alias)			\
-     const char *name, *alias;				\
-{							\
-    ALIAS_SECTION (in_data, "data");			\
-    ALIAS_SECTION (in_text, "text");			\
-    ALIAS_SECTION (in_const, "const");			\
-    ALIAS_SECTION (in_const_data, "const_data");	\
-    ALIAS_SECTION (in_cstring, "cstring");		\
-    ALIAS_SECTION (in_literal4, "literal4");		\
-    ALIAS_SECTION (in_literal8, "literal8");		\
-}
+#define MAX_OFILE_ALIGNMENT (0x8000 * 8)
+
+/* Declare the section variables.  */
+#ifndef USED_FOR_TARGET
+enum darwin_section_enum {
+#define DEF_SECTION(NAME, FLAGS, DIRECTIVE, OBJC) NAME,
+#include "darwin-sections.def"
+#undef DEF_SECTION
+  NUM_DARWIN_SECTIONS
+};
+extern GTY(()) section * darwin_sections[NUM_DARWIN_SECTIONS];
 #endif
 
-#undef	READONLY_DATA_SECTION
-#define READONLY_DATA_SECTION const_section
-
-#undef	SELECT_SECTION
-#define SELECT_SECTION(exp,reloc,align)				\
-  do								\
-    {								\
-      if (TREE_CODE (exp) == STRING_CST)			\
-	{							\
-	  if (flag_writable_strings)				\
-	    data_section ();					\
-	  else if (TREE_STRING_LENGTH (exp) !=			\
-		   strlen (TREE_STRING_POINTER (exp)) + 1)	\
-	    readonly_data_section ();				\
-	  else							\
-	    cstring_section ();					\
-	}							\
-      else if (TREE_CODE (exp) == INTEGER_CST			\
-	       || TREE_CODE (exp) == REAL_CST)			\
-        {							\
-	  tree size = TYPE_SIZE (TREE_TYPE (exp));		\
-	  							\
-	  if (TREE_CODE (size) == INTEGER_CST &&		\
-	      TREE_INT_CST_LOW (size) == 4 &&			\
-	      TREE_INT_CST_HIGH (size) == 0)			\
-	    literal4_section ();				\
-	  else if (TREE_CODE (size) == INTEGER_CST &&		\
-	      TREE_INT_CST_LOW (size) == 8 &&			\
-	      TREE_INT_CST_HIGH (size) == 0)			\
-	    literal8_section ();				\
-	  else							\
-	    readonly_data_section ();				\
-	}							\
-      else if (TREE_CODE (exp) == CONSTRUCTOR				\
-	       && TREE_TYPE (exp)					\
-	       && TREE_CODE (TREE_TYPE (exp)) == RECORD_TYPE		\
-	       && TYPE_NAME (TREE_TYPE (exp)))				\
-	{								\
-	  tree name = TYPE_NAME (TREE_TYPE (exp));			\
-	  if (TREE_CODE (name) == TYPE_DECL)				\
-	    name = DECL_NAME (name);					\
-	  if (!strcmp (IDENTIFIER_POINTER (name), "NSConstantString"))	\
-	    objc_constant_string_object_section ();			\
-	  else if (!strcmp (IDENTIFIER_POINTER (name), "NXConstantString")) \
-	    objc_string_object_section ();				\
-	  else if (TREE_READONLY (exp) || TREE_CONSTANT (exp))		\
-	    {								\
-	      if (TREE_SIDE_EFFECTS (exp) || flag_pic && reloc)		\
-		const_data_section ();					\
-	      else							\
-		readonly_data_section (); 				\
-            }								\
-	  else								\
-	    data_section ();						\
-      }									\
-      else if (TREE_CODE (exp) == VAR_DECL &&				\
-	       DECL_NAME (exp) &&					\
-	       TREE_CODE (DECL_NAME (exp)) == IDENTIFIER_NODE &&	\
-	       IDENTIFIER_POINTER (DECL_NAME (exp)) &&			\
-	       !strncmp (IDENTIFIER_POINTER (DECL_NAME (exp)), "_OBJC_", 6)) \
-	{								\
-	  const char *name = IDENTIFIER_POINTER (DECL_NAME (exp));	\
-	  								\
-	  if (!strncmp (name, "_OBJC_CLASS_METHODS_", 20))		\
-	    objc_cls_meth_section ();					\
-	  else if (!strncmp (name, "_OBJC_INSTANCE_METHODS_", 23))	\
-	    objc_inst_meth_section ();					\
-	  else if (!strncmp (name, "_OBJC_CATEGORY_CLASS_METHODS_", 20)) \
-	    objc_cat_cls_meth_section ();				\
-	  else if (!strncmp (name, "_OBJC_CATEGORY_INSTANCE_METHODS_", 23)) \
-	    objc_cat_inst_meth_section ();				\
-	  else if (!strncmp (name, "_OBJC_CLASS_VARIABLES_", 22))	\
-	    objc_class_vars_section ();					\
-	  else if (!strncmp (name, "_OBJC_INSTANCE_VARIABLES_", 25))	\
-	    objc_instance_vars_section ();				\
-	  else if (!strncmp (name, "_OBJC_CLASS_PROTOCOLS_", 22))	\
-	    objc_cat_cls_meth_section ();				\
-	  else if (!strncmp (name, "_OBJC_CLASS_NAME_", 17))		\
-	    objc_class_names_section ();				\
-	  else if (!strncmp (name, "_OBJC_METH_VAR_NAME_", 20))		\
-	    objc_meth_var_names_section ();				\
-	  else if (!strncmp (name, "_OBJC_METH_VAR_TYPE_", 20))		\
-	    objc_meth_var_types_section ();				\
-	  else if (!strncmp (name, "_OBJC_CLASS_REFERENCES", 22))	\
-	    objc_cls_refs_section ();					\
-	  else if (!strncmp (name, "_OBJC_CLASS_", 12))			\
-	    objc_class_section ();					\
-	  else if (!strncmp (name, "_OBJC_METACLASS_", 16))		\
-	    objc_meta_class_section ();					\
-	  else if (!strncmp (name, "_OBJC_CATEGORY_", 15))		\
-	    objc_category_section ();					\
-	  else if (!strncmp (name, "_OBJC_SELECTOR_REFERENCES", 25))	\
-	    objc_selector_refs_section ();				\
-	  else if (!strncmp (name, "_OBJC_SELECTOR_FIXUP", 20))		\
-	    objc_selector_fixup_section ();				\
-	  else if (!strncmp (name, "_OBJC_SYMBOLS", 13))		\
-	    objc_symbols_section ();					\
-	  else if (!strncmp (name, "_OBJC_MODULES", 13))		\
-	    objc_module_info_section ();				\
-	  else if (!strncmp (name, "_OBJC_PROTOCOL_INSTANCE_METHODS_", 32)) \
-	    objc_cat_inst_meth_section ();                              \
-	  else if (!strncmp (name, "_OBJC_PROTOCOL_CLASS_METHODS_", 29)) \
-	    objc_cat_cls_meth_section ();                               \
-	  else if (!strncmp (name, "_OBJC_PROTOCOL_REFS_", 20))         \
-	    objc_cat_cls_meth_section ();                               \
-	  else if (!strncmp (name, "_OBJC_PROTOCOL_", 15))              \
-	    objc_protocol_section ();                                   \
-	  else if ((TREE_READONLY (exp) || TREE_CONSTANT (exp))		\
-		&& !TREE_SIDE_EFFECTS (exp))     			\
-             { if (flag_pic && reloc ) const_data_section ();             \
-               else readonly_data_section (); }                       	\
-	  else								\
-	    data_section ();						\
-	}								\
-      else if (TREE_READONLY (exp) || TREE_CONSTANT (exp))		\
-	{								\
-	  if (TREE_SIDE_EFFECTS (exp) || flag_pic && reloc)		\
-	    const_data_section ();					\
-	  else								\
-	    readonly_data_section (); 					\
-        }								\
-      else								\
-        data_section ();						\
-      try_section_alias ();						\
-    }									\
-  while (0)
-
-/* This can be called with address expressions as "rtx".
-   They must go in "const". */
-#undef	SELECT_RTX_SECTION
-#define SELECT_RTX_SECTION(mode, rtx, align)				\
-  do									\
-    {									\
-      if (GET_MODE_SIZE (mode) == 8)					\
-	literal8_section ();						\
-      else if (GET_MODE_SIZE (mode) == 4				\
-	       && (GET_CODE (rtx) == CONST_INT				\
-	           || GET_CODE (rtx) == CONST_DOUBLE))			\
-	literal4_section ();						\
-      else								\
-	const_section ();						\
-    }									\
-  while (0)
+#undef	TARGET_ASM_SELECT_SECTION
+#define TARGET_ASM_SELECT_SECTION machopic_select_section
+#define USE_SELECT_SECTION_FOR_FUNCTIONS
+
+#undef	TARGET_ASM_SELECT_RTX_SECTION
+#define TARGET_ASM_SELECT_RTX_SECTION machopic_select_rtx_section
+#undef  TARGET_ASM_UNIQUE_SECTION
+#define TARGET_ASM_UNIQUE_SECTION darwin_unique_section
+#undef  TARGET_ASM_FUNCTION_RODATA_SECTION
+#define TARGET_ASM_FUNCTION_RODATA_SECTION default_no_function_rodata_section
+#undef  TARGET_ASM_RELOC_RW_MASK
+#define TARGET_ASM_RELOC_RW_MASK machopic_reloc_rw_mask
+
 
 #define ASM_DECLARE_UNRESOLVED_REFERENCE(FILE,NAME)			\
-    do { 								\
+    do {								\
 	 if (FILE) {							\
-	   if (flag_pic)						\
+	   if (MACHOPIC_INDIRECT)					\
 	     fprintf (FILE, "\t.lazy_reference ");			\
 	   else								\
 	     fprintf (FILE, "\t.reference ");				\
@@ -670,35 +731,52 @@ static void alias_section (name, alias)			\
     do {								\
 	 if (FILE) {							\
 	   fprintf (FILE, "\t");					\
-	   assemble_name (FILE, NAME); 					\
+	   assemble_name (FILE, NAME);					\
 	   fprintf (FILE, "=0\n");					\
-	   assemble_global (NAME);					\
+	   (*targetm.asm_out.globalize_label) (FILE, NAME);		\
 	 }								\
        } while (0)
 
-#undef ASM_GLOBALIZE_LABEL
-#define ASM_GLOBALIZE_LABEL(FILE,NAME)	\
- do { const char *const _x = (NAME); if (!!strncmp (_x, "_OBJC_", 6)) { \
-  (fputs (".globl ", FILE), assemble_name (FILE, _x), fputs ("\n", FILE)); \
- }} while (0)
+/* Globalizing directive for a label.  */
+#define GLOBAL_ASM_OP ".globl "
+#define TARGET_ASM_GLOBALIZE_LABEL darwin_globalize_label
+
+/* Emit an assembler directive to set visibility for a symbol.  Used
+   to support visibility attribute and Darwin's private extern
+   feature.  */
+#undef TARGET_ASM_ASSEMBLE_VISIBILITY
+#define TARGET_ASM_ASSEMBLE_VISIBILITY darwin_assemble_visibility
+
+/* Extra attributes for Darwin.  */
+#define SUBTARGET_ATTRIBUTE_TABLE					     \
+  /* { name, min_len, max_len, decl_req, type_req, fn_type_req, handler } */ \
+  { "apple_kext_compatibility", 0, 0, false, true, false,		     \
+    darwin_handle_kext_attribute },					     \
+  { "weak_import", 0, 0, true, false, false,				     \
+    darwin_handle_weak_import_attribute }
 
 #undef ASM_GENERATE_INTERNAL_LABEL
 #define ASM_GENERATE_INTERNAL_LABEL(LABEL,PREFIX,NUM)	\
   sprintf (LABEL, "*%s%ld", PREFIX, (long)(NUM))
 
-/* This is how to output an internal numbered label where PREFIX is
-   the class of label and NUM is the number within the class.  */
+#undef TARGET_ASM_MARK_DECL_PRESERVED
+#define TARGET_ASM_MARK_DECL_PRESERVED darwin_mark_decl_preserved
 
-#undef ASM_OUTPUT_INTERNAL_LABEL
-#define ASM_OUTPUT_INTERNAL_LABEL(FILE,PREFIX,NUM)	\
-  fprintf (FILE, "%s%d:\n", PREFIX, NUM)
+/* Set on a symbol with SYMBOL_FLAG_FUNCTION or
+   MACHO_SYMBOL_FLAG_VARIABLE to indicate that the function or
+   variable has been defined in this translation unit.
+   When porting Mach-O to new architectures you need to make
+   sure these aren't clobbered by the backend.  */
 
-/* Since we have a separate readonly data section, define this so that
-   jump tables end up in text rather than data.  */
+#define MACHO_SYMBOL_FLAG_VARIABLE (SYMBOL_FLAG_MACH_DEP)
+#define MACHO_SYMBOL_FLAG_DEFINED ((SYMBOL_FLAG_MACH_DEP) << 1)
 
-#ifndef JUMP_TABLES_IN_TEXT_SECTION
-#define JUMP_TABLES_IN_TEXT_SECTION 1
-#endif
+/* Set on a symbol to indicate when fix-and-continue style code
+   generation is being used and the symbol refers to a static symbol
+   that should be rebound from new instances of a translation unit to
+   the original instance of the data.  */
+
+#define MACHO_SYMBOL_STATIC ((SYMBOL_FLAG_MACH_DEP) << 2)
 
 /* Symbolic names for various things we might know about a symbol.  */
 
@@ -712,19 +790,15 @@ enum machopic_addr_class {
 
 /* Macros defining the various PIC cases.  */
 
-#define MACHOPIC_INDIRECT      (flag_pic)
-#define MACHOPIC_JUST_INDIRECT (flag_pic == 1)
-#define MACHOPIC_PURE          (flag_pic == 2)
-
-#define ENCODE_SECTION_INFO(DECL)  \
-  darwin_encode_section_info (DECL)
-
-/* Be conservative and always redo the encoding.  */
+#define MACHO_DYNAMIC_NO_PIC_P	(TARGET_DYNAMIC_NO_PIC)
+#define MACHOPIC_INDIRECT	(flag_pic || MACHO_DYNAMIC_NO_PIC_P)
+#define MACHOPIC_JUST_INDIRECT	(MACHO_DYNAMIC_NO_PIC_P)
+#define MACHOPIC_PURE		(flag_pic && ! MACHO_DYNAMIC_NO_PIC_P)
 
-#define REDO_SECTION_INFO_P(DECL) (1)
-
-#define STRIP_NAME_ENCODING(VAR,SYMBOL_NAME)  \
-  ((VAR) = ((SYMBOL_NAME[0] == '!') ? (SYMBOL_NAME) + 4 : (SYMBOL_NAME)))
+#undef TARGET_ENCODE_SECTION_INFO
+#define TARGET_ENCODE_SECTION_INFO  darwin_encode_section_info
+#undef TARGET_STRIP_NAME_ENCODING
+#define TARGET_STRIP_NAME_ENCODING  default_strip_name_encoding
 
 #define GEN_BINDER_NAME_FOR_STUB(BUF,STUB,STUB_LENGTH)		\
   do {								\
@@ -760,12 +834,11 @@ enum machopic_addr_class {
 
 #define GEN_LAZY_PTR_NAME_FOR_SYMBOL(BUF,SYMBOL,SYMBOL_LENGTH)	\
   do {								\
-    const char *symbol_ = (SYMBOL);				\
+    const char *symbol_ = (SYMBOL);                             \
     char *buffer_ = (BUF);					\
-    STRIP_NAME_ENCODING (symbol_, symbol_);  \
     if (symbol_[0] == '"')					\
       {								\
-        strcpy (buffer_, "\"L");					\
+        strcpy (buffer_, "\"L");				\
         strcpy (buffer_ + 2, symbol_ + 1);			\
 	strcpy (buffer_ + (SYMBOL_LENGTH), "$lazy_ptr\"");	\
       }								\
@@ -783,17 +856,154 @@ enum machopic_addr_class {
       }								\
   } while (0)
 
-#define TARGET_ASM_EXCEPTION_SECTION darwin_exception_section
+#define EH_FRAME_SECTION_NAME   "__TEXT"
+#define EH_FRAME_SECTION_ATTR ",coalesced,no_toc+strip_static_syms+live_support"
+
+/* Java runtime class list.  */
+#define JCR_SECTION_NAME "__DATA,jcr,regular,no_dead_strip"
 
-#define TARGET_ASM_EH_FRAME_SECTION darwin_eh_frame_section
-  
+#undef ASM_PREFERRED_EH_DATA_FORMAT
 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE,GLOBAL)  \
-  (((CODE) == 1 || (GLOBAL) == 0) ? DW_EH_PE_pcrel : DW_EH_PE_absptr)
-
-#define REGISTER_TARGET_PRAGMAS(PFILE)                          \
-  do {                                                          \
-    cpp_register_pragma (PFILE, 0, "mark", darwin_pragma_ignore);  \
-    cpp_register_pragma (PFILE, 0, "options", darwin_pragma_options);  \
-    cpp_register_pragma (PFILE, 0, "segment", darwin_pragma_ignore);  \
-    cpp_register_pragma (PFILE, 0, "unused", darwin_pragma_unused);  \
+  (((CODE) == 2 && (GLOBAL) == 1) \
+   ? (DW_EH_PE_pcrel | DW_EH_PE_indirect | DW_EH_PE_sdata4) : \
+     ((CODE) == 1 || (GLOBAL) == 0) ? DW_EH_PE_pcrel : DW_EH_PE_absptr)
+
+#define ASM_OUTPUT_DWARF_DELTA(FILE,SIZE,LABEL1,LABEL2)  \
+  darwin_asm_output_dwarf_delta (FILE, SIZE, LABEL1, LABEL2)
+
+#define ASM_OUTPUT_DWARF_OFFSET(FILE,SIZE,LABEL,BASE)  \
+  darwin_asm_output_dwarf_offset (FILE, SIZE, LABEL, BASE)
+
+#define ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX(ASM_OUT_FILE, ENCODING, SIZE, ADDR, DONE)	\
+      if (ENCODING == ASM_PREFERRED_EH_DATA_FORMAT (2, 1)) {				\
+	darwin_non_lazy_pcrel (ASM_OUT_FILE, ADDR);					\
+	goto DONE;									\
+      }
+
+/* Experimentally, putting jump tables in text is faster on SPEC.
+   Also this is needed for correctness for coalesced functions.  */
+
+#ifndef JUMP_TABLES_IN_TEXT_SECTION
+#define JUMP_TABLES_IN_TEXT_SECTION 1
+#endif
+
+#define TARGET_TERMINATE_DW2_EH_FRAME_INFO false
+
+#define TARGET_ASM_INIT_SECTIONS darwin_init_sections
+#undef TARGET_ASM_NAMED_SECTION
+#define TARGET_ASM_NAMED_SECTION darwin_asm_named_section
+
+/* Handle pragma weak and pragma pack.  */
+#define HANDLE_SYSV_PRAGMA 1
+
+#define HANDLE_PRAGMA_PACK_PUSH_POP 1
+
+#define DARWIN_REGISTER_TARGET_PRAGMAS()			\
+  do {								\
+    if (!flag_preprocess_only)					\
+      cpp_register_pragma (parse_in, NULL, "mark",		\
+			   darwin_pragma_ignore, false);	\
+    c_register_pragma (0, "options", darwin_pragma_options);	\
+    c_register_pragma (0, "segment", darwin_pragma_ignore);	\
+    c_register_pragma (0, "unused", darwin_pragma_unused);	\
+    c_register_pragma (0, "ms_struct", darwin_pragma_ms_struct); \
   } while (0)
+
+#undef ASM_APP_ON
+#define ASM_APP_ON ""
+#undef ASM_APP_OFF
+#define ASM_APP_OFF ""
+
+void darwin_register_frameworks (const char *, const char *, int);
+void darwin_register_objc_includes (const char *, const char *, int);
+#define TARGET_EXTRA_PRE_INCLUDES darwin_register_objc_includes
+#define TARGET_EXTRA_INCLUDES darwin_register_frameworks
+
+void add_framework_path (char *);
+#define TARGET_OPTF add_framework_path
+
+#define TARGET_POSIX_IO
+
+/* All new versions of Darwin have C99 functions.  */
+
+#define TARGET_C99_FUNCTIONS 1
+
+#define WINT_TYPE "int"
+
+/* Every program on darwin links against libSystem which contains the pthread
+   routines, so there's no need to explicitly call out when doing threaded
+   work.  */
+
+#undef GOMP_SELF_SPECS
+#define GOMP_SELF_SPECS ""
+
+/* Darwin can't support anchors until we can cope with the adjustments
+   to size that ASM_DECLARE_OBJECT_NAME and ASM_DECLARE_CONSTANT_NAME
+   when outputting members of an anchor block and the linker can be
+   taught to keep them together or we find some other suitable
+   code-gen technique.  */
+
+#if 0
+#define TARGET_ASM_OUTPUT_ANCHOR darwin_asm_output_anchor
+#else
+#define TARGET_ASM_OUTPUT_ANCHOR NULL
+#endif
+
+/* Attempt to turn on execute permission for the stack.  This may be
+    used by INITIALIZE_TRAMPOLINE of the target needs it (that is,
+    if the target machine can change execute permissions on a page).
+
+    There is no way to query the execute permission of the stack, so
+    we always issue the mprotect() call.
+
+    Unfortunately it is not possible to make this namespace-clean.
+
+    Also note that no errors should be emitted by this code; it is
+    considered dangerous for library calls to send messages to
+    stdout/stderr.  */
+
+#define ENABLE_EXECUTE_STACK                                            \
+extern void __enable_execute_stack (void *);                            \
+void                                                                    \
+__enable_execute_stack (void *addr)                                     \
+{                                                                       \
+   extern int mprotect (void *, size_t, int);                           \
+   extern int getpagesize (void);					\
+   static int size;                                                     \
+   static long mask;                                                    \
+                                                                        \
+   char *page, *end;                                                    \
+                                                                        \
+   if (size == 0)                                                       \
+     {                                                                  \
+       size = getpagesize();						\
+       mask = ~((long) size - 1);                                       \
+     }                                                                  \
+                                                                        \
+   page = (char *) (((long) addr) & mask);                              \
+   end  = (char *) ((((long) (addr + (TARGET_64BIT ? 48 : 40))) & mask) + size); \
+                                                                        \
+   /* 7 == PROT_READ | PROT_WRITE | PROT_EXEC */                        \
+   (void) mprotect (page, end - page, 7);                               \
+}
+
+/* For Apple KEXTs, we make the constructors return this to match gcc
+   2.95.  */
+#define TARGET_CXX_CDTOR_RETURNS_THIS (darwin_kextabi_p)
+extern int flag_mkernel;
+extern int flag_apple_kext;
+#define TARGET_KEXTABI flag_apple_kext
+
+#define TARGET_HAS_TARGETCM 1
+
+#ifndef CROSS_DIRECTORY_STRUCTURE
+extern void darwin_default_min_version (int * argc, char *** argv);
+#define GCC_DRIVER_HOST_INITIALIZATION \
+  darwin_default_min_version (&argc, &argv)
+#endif /* CROSS_DIRECTORY_STRUCTURE */
+
+/* The Apple assembler and linker do not support constructor priorities.  */
+#undef SUPPORTS_INIT_PRIORITY
+#define SUPPORTS_INIT_PRIORITY 0
+
+#endif /* CONFIG_DARWIN_H */