re PR target/67172 (i686-w64-mingw32 dwarf2 bootstrap fails with undefined…

re PR target/67172 (i686-w64-mingw32 dwarf2 bootstrap fails with undefined reference to __EH_FRAME_BEGIN__)

	PR target/67172
	* libgcc2.c (L__main): Undefine __LIBGCC_EH_FRAME_SECTION_NAME__ if
	__MINGW32__ is defined.

From-SVN: r234727

libgcc/ChangeLog

+2016-04-04  Eric Botcazou  <ebotcazou@adacore.com>
+
+	PR target/67172
+	* libgcc2.c (L__main): Undefine __LIBGCC_EH_FRAME_SECTION_NAME__ if
+	__MINGW32__ is defined.
+
 2016-03-28  James Bowman  <james.bowman@ftdichip.com>
 
         * libgcc/config/ft32/lib1funcs.S (*divsi3, *modsi3): New.

libgcc/libgcc2.c

@@ -2209,7 +2209,12 @@ TRANSFER_FROM_TRAMPOLINE
 #if !defined (HAS_INIT_SECTION) || !defined (OBJECT_FORMAT_ELF)
 
 /* Some ELF crosses use crtstuff.c to provide __CTOR_LIST__, but use this
-   code to run constructors.  In that case, we need to handle EH here, too.  */
+   code to run constructors.  In that case, we need to handle EH here, too.
+   But MINGW32 is special because it handles CRTSTUFF and EH on its own.  */
+
+#ifdef __MINGW32__
+#undef __LIBGCC_EH_FRAME_SECTION_NAME__
+#endif
 
 #ifdef __LIBGCC_EH_FRAME_SECTION_NAME__
 #include "unwind-dw2-fde.h"