Hi,
this diff was already suggested by matthew@ some time ago.  It renders
clang++ usable with gcc's C++ include files, see:

http://marc.info/?l=openbsd-tech&m=130229126704450&w=2

I don't expect any fallout, but just to be sure, can this go through a
bulk build on affected platforms (gcc4)?



Index: os_defines.h
===================================================================
RCS file: /cvs/src/gnu/gcc/libstdc++-v3/config/os/bsd/openbsd/os_defines.h,v
retrieving revision 1.2
diff -u -p -r1.2 os_defines.h
--- os_defines.h        26 May 2010 11:23:06 -0000      1.2
+++ os_defines.h        17 Nov 2011 18:04:55 -0000
@@ -35,12 +35,6 @@
 // file will come before all others.
 
 #define _GLIBCXX_USE_C99 1
-#define _GLIBCXX_USE_C99_CHECK 1
-#define _GLIBCXX_USE_C99_DYNAMIC (!(__ISO_C_VISIBLE >= 1999))
-#define _GLIBCXX_USE_C99_LONG_LONG_CHECK 1
-#define _GLIBCXX_USE_C99_LONG_LONG_DYNAMIC (_GLIBCXX_USE_C99_DYNAMIC || 
!defined __LONG_LONG_SUPPORTED)
-#define _GLIBCXX_USE_C99_FLOAT_TRANSCENDENTALS_CHECK 1
-#define _GLIBCXX_USE_C99_FLOAT_TRANSCENDENTALS_DYNAMIC defined _XOPEN_SOURCE
 typedef __builtin_va_list __gnuc_va_list;
 
 #endif

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