https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67172
--- Comment #1 from Matt Breedlove <breedlove.matt at gmail dot com> --- Seems to have started with r214954. Here's the direct link to the ML post: https://gcc.gnu.org/ml/gcc-patches/2014-09/msg00409.html Per discussions with Kai, EH_FRAME_SECTION_NAME shouldn't be getting defined for mingw-w64 which it isn't while compiling libgcc2.c however the change to using _LIBGCC_EH_FRAME_SECTION_NAME__ which *is* defined while compiling this file ends up breaking linking. This is mingw specific as the modified code is in a block surrounded by an #ifndef __CYGWIN__. The complexities of gcc's dwarf2 code especially during bootstrapping are a bit beyond me. The patch above merely restores GCC 4.9 behavior for mingw but whether the change should be implemented there or in a target-specific section, I'm not sure.
