ForkOn 21/12/18 16:13, Eli Zaretskii wrote:
> MinGW GCC comes with several object files that are used when linking a
> MinGW program: crt1.o, crt2.o, crtbegin.o, and crtend.o. However, in
> the MinGW source distribution I find only the source of one of them:
> crt1.c. Can someone tell me where are the sources of the rest?
Only the first two of these are provided directly by us; from their
respective dependency listings:
$ head -1 mingwrt/crt[12].d
==> mingwrt/crt1.d <==
crt1.o: ../../mingwrt/crt1.c ...
==> mingwrt/crt2.d <==
crt2.o: ../../mingwrt/crt1.c ...
The other two are provided by the upstream GCC Project folks; you'll
find their sources in the GCC source tarball:
$ head -1 mingw32/libgcc/crt*.dep
==> mingw32/libgcc/crtbegin.dep <==
crtbegin.o: .../gcc-8.2.0/libgcc/config/i386/cygming-crtbegin.c \
==> mingw32/libgcc/crtend.dep <==
crtend.o: .../gcc-8.2.0/libgcc/config/i386/cygming-crtend.c \
==> mingw32/libgcc/crtfastmath.dep <==
crtfastmath.o: .../gcc-8.2.0/libgcc/config/i386/crtfastmath.c \
> I'm asking because about every MinGW program I compile has 2
> unresolved symbols: ___register_frame_info and
> ___deregister_frame_info, and those seem to come from crtbegin.o, so
> I'd like to look at the source of that to better understand what are
> those symbols and why they stay unresolved.
Both seem to be defined, as weak symbols, in crtbegin.o:
$ nm gcc/crtbegin.o
U _atexit
00000000 b .bss
00000000 d .data
00000000 d _deregister_frame_fn
w ___deregister_frame_info
00000000 i .drectve
00000000 r .eh_frame
00000000 R ___EH_FRAME_BEGIN__
U _FreeLibrary at 4
000000b0 T ___gcc_deregister_frame
00000000 T ___gcc_register_frame
U _GetModuleHandleA at 4
U _GetProcAddress at 8
00000004 C _hmod_libgcc
U _LoadLibraryA at 4
00000000 b _obj
00000000 r .rdata
00000000 r .rdata$zzz
w ___register_frame_info
00000000 t .text
00000000 A .weak.___deregister_frame_info.___EH_FRAME_BEGIN__
00000000 A .weak.___register_frame_info.___EH_FRAME_BEGIN__
--
Regards,
Keith.
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