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-The collector uses a large amount of conditional compilation in order to
-deal with platform dependencies.  This violates a number of known coding
-standards.  On the other hand, it seems to be the only practical way to
-support this many platforms without excessive code duplication. 
-
-A few guidelines have mostly been followed in order to keep this manageable:
-
-1) #if and #ifdef directives are properly indented whenever easily possible.
-All known C compilers allow whitespace between the "#" and the "if" to make
-this possible.  ANSI C also allows white space before the "#", though we
-avoid that.  It has the known disadvantages that it differs from the normal
-GNU conventions, and that it makes patches larger than otherwise necessary.
-In my opinion, it's still well worth it, for the same reason that we indent
-ordinary "if" statements.
-
-2) Whenever possible, tests are performed on the macros defined in gcconfig.h
-instead of directly testing patform-specific predefined macros.  This makes it
-relatively easy to adapt to new compilers with a different set of predefined
-macros.  Currently these macros generally identify platforms instead of
-features.  In many cases, this is a mistake.
-
-3) The code currently avoids #elif, eventhough that would make it more
-readable.  This was done since #elif would need to be understood by ALL
-compilers used to build the collector, and that hasn't always been the case.
-It makes sense to reconsider this decision at some point, since #elif has been
-standardized at least since 1989.
-
-Many of the tested configuration macros are at least somewhat defined in
-either include/private/gcconfig.h or in Makefile.direct.  Here is an attempt
-at defining some of the remainder:  (Thanks to Walter Bright for suggesting
-this.  This is a work in progress)
-
-MACRO		EXPLANATION
------		-----------
-
-__DMC__	Always #define'd by the Digital Mars compiler. Expands
-		to the compiler version number in hex, i.e. 0x810 is
-		version 8.1b0
-
-_ENABLE_ARRAYNEW
-		#define'd by the Digital Mars C++ compiler when
-		operator new[] and delete[] are separately
-		overloadable. Used in gc_cpp.h.
-
-_MSC_VER	Expands to the Visual C++ compiler version.  Assumed to
-		not be defined for other compilers (at least if they behave
-		appreciably differently).
-
-_DLL		Defined by Visual C++ if dynamic libraries are being built
-		or used.  Used to test whether __declspec(dllimport) or
-		__declspec(dllexport) needs to be added to declarations
-		to support the case in which the collector is in a dll.
-
-GC_DLL		User-settable macro that forces the effect of _DLL.
-
-GC_NOT_DLL	User-settable macro that overrides _DLL, e.g. if dynamic
-		libraries are used, but the collector is in a static library.
-
-__STDC__	Assumed to be defined only by compilers that understand
-		prototypes and other C89 features.  Its value is generally
-		not used, since we are fine with most nonconforming extensions.
-
-SUNOS5SIGS	Solaris-like signal handling.  This is probably misnamed,
-		since it really doesn't guarantee much more than Posix.
-		Currently set only for Solaris2.X, HPUX, and DRSNX.  Should
-		probably be set for some other platforms.
-
-PCR		Set if the collector is being built as part of the Xerox
-		Portable Common Runtime.
-
-SRC_M3		Set if the collector is being built as a replacement of the
-		one in the DEC/Compaq SRC Modula-3 runtime.  I suspect this
-		was last used around 1994, and no doubt broke a long time ago.
-		It's there primarily incase someone wants to port to a similar
-		system.
-
-
-