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From: "howarth at nitro dot med.uc.edu" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug plugins/45787] r164531 breaks plugin support on x86_64-apple-darwin10
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45787

--- Comment #4 from Jack Howarth <howarth at nitro dot med.uc.edu> 2010-09-25 19:06:18 UTC ---
Thanks! Adding...

Index: gcc/config/darwin.opt
===================================================================
--- gcc/config/darwin.opt    (revision 164620)
+++ gcc/config/darwin.opt    (working copy)
@@ -45,3 +45,6 @@
 iframework
 Target RejectNegative C ObjC C++ ObjC++ Joined Separate 
 -iframework <dir>    Add <dir> to the end of the system framework include path
+
+undefined
+Driver Separate

...eliminates issue with the autohost.h in all stages of the gcc build now
reporting...

/* Define to enable plugin support. */
#ifndef USED_FOR_TARGET
#define ENABLE_PLUGIN 1
#endif

...as expected and the plugin directory is once again installed in
lib/gcc/x86_64-apple-darwin10.4.0/4.6.0.