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From: "howarth at nitro dot med.uc.edu" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/55610] cc1 is calling munmap() on part of itself on darwin
Date: Fri, 07 Dec 2012 17:35:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55610

--- Comment #4 from Jack Howarth <howarth at nitro dot med.uc.edu> 2012-12-07 17:35:00 UTC ---
--- gcc-4.7.2/gcc/config/host-darwin.c.orig     2012-12-07 11:30:48.000000000
-0500
+++ gcc-4.7.2/gcc/config/host-darwin.c  2012-12-07 11:39:21.000000000 -0500
@@ -57,8 +57,8 @@
   /* Round the size to a whole page size.  Normally this is a no-op.  */
   sz = (sz + pagesize - 1) / pagesize * pagesize;

-  if (munmap (pch_address_space + sz, sizeof (pch_address_space) - sz) != 0)
-    fatal_error ("couldn%'t unmap pch_address_space: %m");
+  /* if (munmap (pch_address_space + sz, sizeof (pch_address_space) - sz) !=
0)
+    fatal_error ("couldn%'t unmap pch_address_space: %m"); */

   if (ret)
     {

eliminates the dyld: lazy symbol binding failure with...

/sw/lib/gcc4.7/bin/gcc-4 -fplugin=/sw/lib/gcc4.7/lib/dragonegg.so -O3
-fplugin-arg-dragonegg-llvm-option=-load:/sw/opt/llvm-3.2/lib/LLVMPolly.so
-fplugin-arg-dragonegg-llvm-option=-polly himenoBMTxpa.c

under llvm/polly/dragonegg 3.2 branch. Will run full regression testing on the
gcc 4.7.2 build to hunt for regressions from this change to
darwin_gt_pch_use_address on x86_64-apple-darwin12.