[Gc] MinGW pthreads support

[Andy Wingo]

Hey folks,

Jan Nieuwenhuizen's "Grand Unified Builder" project[0] has been carrying
a patch to enable pthreads on mingw for BDW-GC, using the pthreads-win32
package[1].

[0] http://lilypond.org/gub/
[1] http://www.mingw.org/wiki/pthreads_library

It's straightforward.  Interested?

--- libgc-7.2.4/configure.ac~	2011-01-31 23:19:46.556212301 +0100
+++ libgc-7.2.4/configure.ac	2011-01-31 23:22:07.347644925 +0100
@@ -197,6 +197,14 @@ case "$THREADS" in
 	THREADDLLIBS=""
 	win32_threads=true
 	;;
+     *-*-mingw*)
+	AC_DEFINE(GC_THREADS)
+        if test "${enable_parallel_mark}" = yes; then
+	  AC_DEFINE(PARALLEL_MARK)
+	fi
+	AC_DEFINE(THREAD_LOCAL_ALLOC)
+	THREADDLLIBS="-lpthread"
+	;;
      *-*-darwin*)
 	AC_DEFINE(GC_DARWIN_THREADS)
 	AC_DEFINE(THREAD_LOCAL_ALLOC)

Regards,

Andy
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