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

[Timo Rothenpieler]

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++.

> Workaround is  --extra-libs=-lstdc++ but something seems confusing to me here.
> Advice welcome.  Or if I should file something let me know, thank you :)
> 
> -=roger
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