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

[Roger Pack]

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

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!