Ok, some followup on this issue
asked on #[email protected] and got told that this result was wrong
```
1 tangible@holo:~/Dev/ffmpegâ« readelf -r libswscale/libswscale.a | grep
R_X86_64_PC32.*ff_w1111
00000000640d 007c00000002 R_X86_64_PC32 0000000000000000 ff_w1111 - 4
007c00000002 R_X86_64_PC32 0000000000000000 ff_w1111 - 4
007c00000002 R_X86_64_PC32 0000000000000000 ff_w1111 - 4
007c00000002 R_X86_64_PC32 0000000000000000 ff_w1111 - 4
0000000069bd 007c00000002 R_X86_64_PC32 0000000000000000 ff_w1111 - 4
000000006aa8 007c00000002 R_X86_64_PC32 0000000000000000 ff_w1111 - 4
000000006b94 007c00000002 R_X86_64_PC32 0000000000000000 ff_w1111 - 4
000000006f3d 007c00000002 R_X86_64_PC32 0000000000000000 ff_w1111 - 4
000000007028 007c00000002 R_X86_64_PC32 0000000000000000 ff_w1111 - 4
000000007114 007c00000002 R_X86_64_PC32 0000000000000000 ff_w1111 - 4
```
meaning that my code wasn't relocatable, ran
make SHELL='bash -x'
to get the actual commands run by make, then grepped for rgb2rgb.o and
libswscale.a in it, and got these results
```
+ printf 'CC\t%s\n' libswscale/rgb2rgb.o
CC libswscale/rgb2rgb.o
+ gcc -I. -I./ -D_ISOC99_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE
-D_POSIX_C_SOURCE=200112 -D_XOPEN_SOURCE=600 -DPIC -DZLIB_CONST
-DHAVE_AV_CONFIG_H -std=c99 -fomit-frame-pointer -fPIC -pthread -g
-Wdeclaration-after-statement -Wall -Wdisabled-optimization -Wpointer-arith
-Wredundant-decls -Wwrite-strings -Wtype-limits -Wundef -Wmissing-prototypes
-Wno-pointer-to-int-cast -Wstrict-prototypes -Wempty-body -Wno-parentheses
-Wno-switch -Wno-format-zero-length -Wno-pointer-sign -O3 -fno-math-errno
-fno-signed-zeros -fno-tree-vectorize -Werror=format-security
-Werror=implicit-function-declaration -Werror=missing-prototypes
-Werror=return-type -Werror=vla -Wformat -fdiagnostics-color=auto
-Wno-maybe-uninitialized -MMD -MF libswscale/rgb2rgb.d -MT libswscale/rgb2rgb.o
-c -o libswscale/rgb2rgb.o libswscale/rgb2rgb.c
+ printf 'CC\t%s\n' libswscale/x86/rgb2rgb.o
CC libswscale/x86/rgb2rgb.o
+ gcc -I. -I./ -D_ISOC99_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE
-D_POSIX_C_SOURCE=200112 -D_XOPEN_SOURCE=600 -DPIC -DZLIB_CONST
-DHAVE_AV_CONFIG_H -std=c99 -fomit-frame-pointer -fPIC -pthread -g
-Wdeclaration-after-statement -Wall -Wdisabled-optimization -Wpointer-arith
-Wredundant-decls -Wwrite-strings -Wtype-limits -Wundef -Wmissing-prototypes
-Wno-pointer-to-int-cast -Wstrict-prototypes -Wempty-body -Wno-parentheses
-Wno-switch -Wno-format-zero-length -Wno-pointer-sign -O3 -fno-math-errno
-fno-signed-zeros -fno-tree-vectorize -Werror=format-security
-Werror=implicit-function-declaration -Werror=missing-prototypes
-Werror=return-type -Werror=vla -Wformat -fdiagnostics-color=auto
-Wno-maybe-uninitialized -MMD -MF libswscale/x86/rgb2rgb.d -MT
libswscale/x86/rgb2rgb.o -c -o libswscale/x86/rgb2rgb.o libswscale/x86/rgb2rgb.c
+ gcc -shared -Wl,-soname,libswscale.so.3 -Wl,-Bsymbolic
-Wl,--version-script,libswscale/libswscale.ver -Llibavcodec -Llibavdevice
-Llibavfilter -Llibavformat -Llibavresample -Llibavutil -Llibpostproc
-Llibswscale -Llibswresample -fPIC -Wl,--as-needed -Wl,-z,noexecstack
-Wl,--warn-common
-Wl,-rpath-link=libpostproc:libswresample:libswscale:libavfilter:libavdevice:libavformat:libavcodec:libavutil:libavresample
-o libswscale/libswscale.so.3 libswscale/alphablend.o libswscale/hscale.o
libswscale/hscale_fast_bilinear.o libswscale/input.o libswscale/log2_tab.o
libswscale/options.o libswscale/output.o libswscale/rgb2rgb.o
libswscale/slice.o libswscale/swscale.o libswscale/swscale_unscaled.o
libswscale/utils.o libswscale/vscale.o
libswscale/x86/hscale_fast_bilinear_simd.o libswscale/x86/input.o
libswscale/x86/output.o libswscale/x86/rgb2rgb.o libswscale/x86/scale.o
libswscale/x86/swscale.o libswscale/x86/yuv2rgb.o libswscale/yuv2rgb.o -lavutil
-lXv -lX11 -lXext -lxcb -lxcb-shm -lxcb -lxcb-xfixes -lxcb-render -lxcb-shape
-lxcb -lxcb-shape -lxcb -lX11 -lasound -lm -llzma -lz -pthread
+ ar rcD libswscale/libswscale.a libswscale/alphablend.o libswscale/hscale.o
libswscale/hscale_fast_bilinear.o libswscale/input.o libswscale/log2_tab.o
libswscale/options.o libswscale/output.o libswscale/rgb2rgb.o
libswscale/slice.o libswscale/swscale.o libswscale/swscale_unscaled.o
libswscale/utils.o libswscale/vscale.o
libswscale/x86/hscale_fast_bilinear_simd.o libswscale/x86/input.o
libswscale/x86/output.o libswscale/x86/rgb2rgb.o libswscale/x86/scale.o
libswscale/x86/swscale.o libswscale/x86/yuv2rgb.o libswscale/yuv2rgb.o
```
(http://paste.ubuntu.com/12198450/)
and
```
+ rm -f libswscale/libswscale.a
+ printf 'AR\t%s\n' libswscale/libswscale.a
AR libswscale/libswscale.a
+ ar rcD libswscale/libswscale.a libswscale/alphablend.o libswscale/hscale.o
libswscale/hscale_fast_bilinear.o libswscale/input.o libswscale/log2_tab.o
libswscale/options.o libswscale/output.o libswscale/rgb2rgb.o
libswscale/slice.o libswscale/swscale.o libswscale/swscale_unscaled.o
libswscale/utils.o libswscale/vscale.o
libswscale/x86/hscale_fast_bilinear_simd.o libswscale/x86/input.o
libswscale/x86/output.o libswscale/x86/rgb2rgb.o libswscale/x86/scale.o
libswscale/x86/swscale.o libswscale/x86/yuv2rgb.o libswscale/yuv2rgb.o
+ ranlib -D libswscale/libswscale.a
```
(http://paste.ubuntu.com/12198463/)
so it *seems* things are called correctly with -fPIC and -DPIC and
-shared when needed, but maybe something is escaping me. Got suggested
on #gcc that maybe inline asm caused the issue, but i have no idea about
that.
Any pointer welcome.
On Tue, Aug 25, 2015 at 09:57:24AM +0000, Carl Eugen Hoyos wrote:
Gabriel Pettier <gabriel.pettier <at> gmail.com> writes:
I tried a lot of different ones, here are a few (by order)
Did you run "make distclean" after each try?
What version of FFmpeg is this?
I was unable to reproduce your issue with the following
command:
$ ./configure && make libswscale/libswscale.a
$ gcc libswscale/libswscale.a -shared -o out.so
Carl Eugen
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