When targeting i686-mingw32 all programs compiled with GCC with DWARF2 unwinding, including GCC itself, segfault when exiting. The segfaults are null pointer references in __deregister_frame_info_bases, called from atexit handler runner. Tested on 4.9.1 r. 209891. Didn't test the trunk. Backtrace (from Wine, on real Windows it's very similar): #0 0x010b7810 in __deregister_frame_info_bases (begin=0x7ed5bb6f <MSVCRT__cexit+127>) at ../../../../src/gcc/libgcc/unwind-dw2-fde.c:216 #1 0x05c2fd38 in ?? () #2 0x7ed5bb6f in MSVCRT__cexit () from /usr/bin/../lib32/wine/msvcrt.dll.so #3 0x7ed5be3e in MSVCRT_exit () from /usr/bin/../lib32/wine/msvcrt.dll.so #4 0x004014c3 in __tmainCRTStartup () #5 0x7b86041c in call_process_entry () from /usr/bin/../lib32/wine/kernel32.dll.so #6 0x7b861563 in ExitProcess () from /usr/bin/../lib32/wine/kernel32.dll.so #7 0x7bc80490 in call_thread_func_wrapper () from /usr/bin/../lib32/wine/ntdll.dll.so #8 0x7bc834cf in call_thread_func () from /usr/bin/../lib32/wine/ntdll.dll.so #9 0x7bc8046e in RtlRaiseException () from /usr/bin/../lib32/wine/ntdll.dll.so #10 0x7bc53931 in call_dll_entry_point () from /usr/bin/../lib32/wine/ntdll.dll.so #11 0xf7559b6d in wine_call_on_stack () from /usr/bin/../lib32/libwine.so.1 #12 0xf7559c4e in wine_switch_to_stack () from /usr/bin/../lib32/libwine.so.1
Note: I was compiling with -O2, so the line number may not be very indicative. Should I post a backtrace of -O0?
Isn't this a dup of PR60830 and thus a binutils bug?
It is a duplicate of PR60830. It is a pe-coff bug concerning weak-definitions. *** This bug has been marked as a duplicate of bug 60830 ***