On 2010-01-17 09:21, Danny Backx wrote:
> I'd still like the answer to that first question, but after bypassing
> these issues, I did see evidence of a problem I need to look into. See
> the ld crash below.
>
> arm-mingw32ce-gcc -shared -Wl,--output-def,libswscale/swscale-0.def
> -Wl,--out-implib,libswscale/libswscale.dll.a
> -Wl,--enable-runtime-pseudo-reloc -Wl,--enable-auto-image-base
> -Wl,--version-script,libswscale/libswscale.ver
> -L"/home/danny/src/ffmpeg/ffmpeg"/libavcodec
> -L"/home/danny/src/ffmpeg/ffmpeg"/libavdevice
> -L"/home/danny/src/ffmpeg/ffmpeg"/libavfilter
> -L"/home/danny/src/ffmpeg/ffmpeg"/libavformat
> -L"/home/danny/src/ffmpeg/ffmpeg"/libavutil
> -L"/home/danny/src/ffmpeg/ffmpeg"/libpostproc
> -L"/home/danny/src/ffmpeg/ffmpeg"/libswscale -Wl,--enable-auto-import
> -Wl,--warn-common -Wl,--as-needed
> -Wl,-rpath-link,"/home/danny/src/ffmpeg/ffmpeg"/libpostproc
> -Wl,-rpath-link,"/home/danny/src/ffmpeg/ffmpeg"/libswscale
> -Wl,-rpath-link,"/home/danny/src/ffmpeg/ffmpeg"/libavfilter
> -Wl,-rpath-link,"/home/danny/src/ffmpeg/ffmpeg"/libavdevice
> -Wl,-rpath-link,"/home/danny/src/ffmpeg/ffmpeg"/libavformat
> -Wl,-rpath-link,"/home/danny/src/ffmpeg/ffmpeg"/libavcodec
> -Wl,-rpath-link,"/home/danny/src/ffmpeg/ffmpeg"/libavutil -Wl,-Bsymbolic
> -o libswscale/swscale-0.dll libswscale/options.o libswscale/rgb2rgb.o
> libswscale/swscale.o libswscale/yuv2rgb.o -lavutil -lm
> collect2: ld terminated with signal 11 [Segmentation fault], core dumped
> /opt/mingw32ce/lib/gcc/arm-mingw32ce/4.4.0/../../../../arm-mingw32ce/bin/ld:
> nmimp000000.o: reloc against a non-existant symbol index: 456
> gmake: *** [libswscale/swscale-0.dll] Error 1
> gmake: Target `all' not remade because of errors.
>
> pavilion: {2999} gdb arm-mingw32ce-ld core.3365
> GNU gdb 6.8-6mdv2009.1 (Mandriva Linux release 2009.1)
> Copyright (C) 2008 Free Software Foundation, Inc.
> License GPLv3+: GNU GPL version 3 or later
> <http://gnu.org/licenses/gpl.html>
> This is free software: you are free to change and redistribute it.
> There is NO WARRANTY, to the extent permitted by law. Type "show
> copying"
> and "show warranty" for details.
> This GDB was configured as "i586-mandriva-linux-gnu"...
>
> warning: core file may not match specified executable file.
>
> warning: Can't read pathname for load map: Input/output error.
> Reading symbols from /lib/libz.so.1...done.
> Loaded symbols for /lib/libz.so.1
> Reading symbols from /lib/i686/libc.so.6...done.
> Loaded symbols for /lib/i686/libc.so.6
> Reading symbols from /lib/ld-linux.so.2...done.
> Loaded symbols for /lib/ld-linux.so.2
> Core was generated by
> `/opt/mingw32ce/lib/gcc/arm-mingw32ce/4.4.0/../../../../arm-mingw32ce/bin/ld
> --s'.
> Program terminated with signal 11, Segmentation fault.
> [New process 3365]
> #0 0x400baa6a in strcmp () from /lib/i686/libc.so.6
> Missing debug package(s), you should install:
> glibc-debug-2.9-0.20081113.5mnb2.i586 zlib-debug-1.2.3-13mdv2009.1.i586
> (gdb) where
> #0 0x400baa6a in strcmp () from /lib/i686/libc.so.6
> #1 0x080676e9 in pe_walk_relocs_of_symbol (info=0x80db5a0,
> name=0x815ec2b "av_pix_fmt_descriptors", cb=0x8064c60
> <make_import_fixup>)
>
> at
> /home/danny/src/cegcc/svn.sf.net/cegcc/trunk/cegcc/src/binutils/ld/pe-dll.c:1261
> #2 0x08064147 in pe_find_data_imports () at earm_wince_pe.c:1027
> #3 0x080642d7 in gld_arm_wince_pe_after_open () at earm_wince_pe.c:1124
> #4 0x08058b68 in lang_process ()
>
> at
> /home/danny/src/cegcc/svn.sf.net/cegcc/trunk/cegcc/src/binutils/ld/ldlang.c:6293
> #5 0x0805cbf8 in main (argc=Cannot access memory at address 0x0
> )
>
> at
> /home/danny/src/cegcc/svn.sf.net/cegcc/trunk/cegcc/src/binutils/ld/ldmain.c:455
>
>
The callstack I get is similar but not quite the same:
(gdb) bt
#0 0x00000000004442bb in coff_write_relocs (abfd=0x196ff20) at
/home/ext/temp/cegcc/src/binutils/bfd/coffcode.h:2651
#1 coff_write_object_contents (abfd=0x196ff20) at
/home/ext/temp/cegcc/src/binutils/bfd/coffcode.h:4131
#2 0x000000000042fb57 in bfd_make_readable (abfd=0x196ff20) at
/home/ext/temp/cegcc/src/binutils/bfd/opncls.c:865
#3 0x0000000000424510 in make_singleton_name_imp (rel=0x1db62a0,
s=<value optimized out>, addend=0)
at /home/ext/temp/cegcc/src/binutils/ld/pe-dll.c:2253
#4 pe_create_import_fixup (rel=0x1db62a0, s=<value optimized out>,
addend=0) at /home/ext/temp/cegcc/src/binutils/ld/pe-dll.c:2570
#5 0x000000000041dda2 in make_import_fixup (rel=0x1db62a0, s=0x19810c0)
at earm_wince_pe.c:957
#6 0x00000000004203e7 in pe_walk_relocs_of_symbol (info=<value
optimized out>, name=0x1981ea0 "av_pix_fmt_descriptors",
cb=0x41dd20 <make_import_fixup>) at
/home/ext/temp/cegcc/src/binutils/ld/pe-dll.c:1262
#7 0x000000000041d1eb in pe_find_data_imports () at earm_wince_pe.c:1027
#8 0x000000000041d3ba in gld_arm_wince_pe_after_open () at
earm_wince_pe.c:1124
#9 0x0000000000410e48 in lang_process () at
/home/ext/temp/cegcc/src/binutils/ld/ldlang.c:6293
#10 0x0000000000415907 in main (argc=83, argv=0x7fff39dc8b58) at
/home/ext/temp/cegcc/src/binutils/ld/ldmain.c:455
(gdb) frame 0
#0 0x00000000004442bb in coff_write_relocs (abfd=0x196ff20) at
/home/ext/temp/cegcc/src/binutils/bfd/coffcode.h:2651
2651 if (q->sym_ptr_ptr[0]->the_bfd != abfd)
(gdb) p q->sym_ptr_ptr[0]
$5 = (struct bfd_symbol *) 0x0
This deference is what's causing my SIGSEGV and looking at your
callstack I see that your frame #1 matches my frame #6 so I guess the
issues are related.
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