[FFmpeg-devel] configure doesn't seem to use pkg-config flags?

[Timo Rothenpieler]

On 31/01/2024 05:31, Roger Pack wrote:
> On Thu, Jan 18, 2024 at 6:31 AM Timo Rothenpieler <timo at rothenpieler.org> wrote:
>>
>>
>>
>> On 18/01/2024 04:38, Roger Pack wrote:
>>> Hello.
>>> After compiling libx265 as a "static library" (mingw cross compiling
>>> targeting win64)
>>>
>>> $ pkg-config --libs --static x265
>>> -L/home/rdp/new/sandbox/win64_static/build_files/lib -lx265
>>> /usr/lib/gcc/x86_64-w64-mingw32/10-win32/libstdc++.a -lgcc
>>>
>>> I get this failure at configure time:
>>>
>>> ./configure --enable-libx265 --arch=x86_64 --target-os=mingw32
>>> --cross-prefix=x86_64-w64-mingw32- --pkg-config=pkg-config
>>> --pkg-config-flags=--static
>>>
>>> ERROR: x265 not found using pkg-config
>>>
>>> config.log (sorry it's verbose, first compile passes, second one fails linking)
>>>
>>> ...
>>> require_pkg_config libx265 x265 x265.h x265_api_get
>>> check_pkg_config libx265 x265 x265.h x265_api_get
>>> test_pkg_config libx265 x265 x265.h x265_api_get
>>> pkg-config --exists --print-errors x265
>>> check_func_headers x265.h x265_api_get
>>> -I/home/rdp/new/sandbox/win64_static/build_files/include
>>> -L/home/rdp/new/sandbox/win64_static/build_files/lib -lx265
>>> /usr/lib/gcc/x86_64-w64-mingw32/10-win32/libstdc++.a -lgcc
>>> test_ld cc -I/home/rdp/new/sandbox/win64_static/build_files/include
>>> -L/home/rdp/new/sandbox/win64_static/build_files/lib -lx265
>>> /usr/lib/gcc/x86_64-w64-mingw32/10-win32/libstdc++.a -lgcc
>>> test_cc -I/home/rdp/new/sandbox/win64_static/build_files/include
>>> -L/home/rdp/new/sandbox/win64_static/build_files/lib
>>> /usr/lib/gcc/x86_64-w64-mingw32/10-win32/libstdc++.a
>>> BEGIN /tmp/ffconf.L9GhKESq/test.c
>>>       1   #include <x265.h>
>>>       2   #include <stdint.h>
>>>       3   long check_x265_api_get(void) { return (long) x265_api_get; }
>>>       4   int main(void) { int ret = 0;
>>>       5    ret |= ((intptr_t)check_x265_api_get) & 0xFFFF;
>>>       6   return ret; }
>>> END /tmp/ffconf.L9GhKESq/test.c
>>> x86_64-w64-mingw32-gcc -D_ISOC99_SOURCE -D_FILE_OFFSET_BITS=64
>>> -D_LARGEFILE_SOURCE -U__STRICT_ANSI__ -D__USE_MINGW_ANSI_STDIO=1
>>> -D__printf__=__gnu_printf__ -D_WIN32_WINNT=0x0600
>>> -D_POSIX_C_SOURCE=200112 -D_XOPEN_SOURCE=600 -DPIC -std=c11
>>> -fomit-frame-pointer
>>> -I/home/rdp/new/sandbox/win64_static/build_files/include
>>> -L/home/rdp/new/sandbox/win64_static/build_files/lib
>>> /usr/lib/gcc/x86_64-w64-mingw32/10-win32/libstdc++.a -c -o
>>> /tmp/ffconf.L9GhKESq/test.o /tmp/ffconf.L9GhKESq/test.c
>>> /tmp/ffconf.L9GhKESq/test.c: In function 'check_x265_api_get':
>>> /tmp/ffconf.L9GhKESq/test.c:3:40: warning: cast from pointer to
>>> integer of different size [-Wpointer-to-int-cast]
>>>       3 | long check_x265_api_get(void) { return (long) x265_api_get; }
>>>         |                                        ^
>>> x86_64-w64-mingw32-gcc: warning:
>>> /usr/lib/gcc/x86_64-w64-mingw32/10-win32/libstdc++.a: linker input
>>> file unused because linking not done
>>> x86_64-w64-mingw32-gcc -Wl,--nxcompat,--dynamicbase
>>> -Wl,--high-entropy-va -Wl,--as-needed -Wl,--image-base,0x140000000
>>> -I/home/rdp/new/sandbox/win64_static/build_files/include
>>> -L/home/rdp/new/sandbox/win64_static/build_files/lib
>>> /usr/lib/gcc/x86_64-w64-mingw32/10-win32/libstdc++.a -o
>>> /tmp/ffconf.L9GhKESq/test.exe /tmp/ffconf.L9GhKESq/test.o -lx265 -lgcc
>>> /usr/bin/x86_64-w64-mingw32-ld:
>>> /home/rdp/new/sandbox/win64_static/build_files/lib/libx265.a(api.cpp.obj):api.cpp:(.text+0xfb5):
>>> undefined reference to `operator new(unsigned long long)'
>>> /usr/bin/x86_64-w64-mingw32-ld:
>>> /home/rdp/new/sandbox/win64_static/build_files/lib/libx265.a(api.cpp.obj):api.cpp:(.text+0x1303):
>>> undefined reference to `operator delete(void*)'
>>> ...
>>>
>>> So it seems to be linking it not using the output of pkg-config --libs
>>> --static for linking or something?
>>
>> It's passing the pkg-config flags just fine.
>> The x265 .pc file is just broken and does not state its dependency on
>> libstdc++
> 
> x265.pc does list libstdc++
> 
> $ pkg-config --libs --static x265
> -L/home/rdp/new/sandbox/win64_static/build_files/lib -lx265
> /usr/lib/gcc/x86_64-w64-mingw32/10-win32/libstdc++.a -lgcc

I don't think that's a valid way to specify libs by absolute path.
At least configure doesn't think so, it specifically looks for stuff 
starting with "-l" and discards the rest. Try adding -l: to the beginning.


> When I configure ffmpeg I specify ./configure --pkg-config-flags=--static
> 
> But it appears to be rearranging the order when configure tries to use it?
> 
> x86_64-w64-mingw32-gcc: warning:
> /usr/lib/gcc/x86_64-w64-mingw32/10-win32/libstdc++.a: linker input
> file unused because linking not done
> x86_64-w64-mingw32-gcc -Wl,--nxcompat,--dynamicbase
> -Wl,--high-entropy-va -Wl,--as-needed -Wl,--image-base,0x140000000
> -I/home/rdp/new/sandbox/win64_static/build_files/include
> -L/home/rdp/new/sandbox/win64_static/build_files/lib
> /usr/lib/gcc/x86_64-w64-mingw32/10-win32/libstdc++.a -o
> /tmp/ffconf.L9GhKESq/test.exe /tmp/ffconf.L9GhKESq/test.o -lx265 -lgcc
> # THIS LINE has only x265 and lgcc
> 
> /usr/bin/x86_64-w64-mingw32-ld:
> /home/rdp/new/sandbox/win64_static/build_files/lib/libx265.a(api.cpp.obj):api.cpp:(.text+0xfb5):
> undefined reference to `operator new(unsigned long long)'
> 
> 
> Possibly useful info:
> 
> $ pkg-config --libs x265
> -L/home/rdp/new/sandbox/win64_static/build_files/lib -lx265
> $ pkg-config --libs x265 --static
> -L/home/rdp/new/sandbox/win64_static/build_files/lib -lx265
> /usr/lib/gcc/x86_64-w64-mingw32/10-win32/libstdc++.a -lgcc
> 
> It doesn't seem to be using either of those somehow...though I suppose
> if I cared enough I could try and figure it out :)
> 
> Cheers, thank you!
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