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  • compiling ffmpeg with decklink fails on debian

    16 avril 2019, par derhottevomdorf

    Following FFmpeg Wiki : Ubuntu. All dependencies, gcc, nasm, etc. should be up to date. I compiled ffmpeg successfully without Decklink library.

    Now adding --enable-decklink and the required includes from Decklink SDK I get the errors below.

    Any ideas ?

    CXX     libavdevice/decklink_common.o
    
cc1plus: warning: command line option ‘-Wdeclaration-after-statement’ is valid for C/ObjC but not for C++
    
cc1plus: warning: command line option ‘-Wmissing-prototypes’ is valid for C/ObjC but not for C++
    
cc1plus: warning: command line option ‘-Wno-pointer-to-int-cast’ is valid for C/ObjC but not for C++
    
cc1plus: warning: command line option ‘-Wstrict-prototypes’ is valid for C/ObjC but not for C++
    
cc1plus: warning: command line option ‘-Wno-pointer-sign’ is valid for C/ObjC but not for C++
    
cc1plus: warning: command line option ‘-std=c11’ is valid for C/ObjC but not for C++
    
In file included from libavdevice/decklink_common.cpp:54:0:
    
libavdevice/decklink_common.h:90:5: error: ‘IDeckLinkAttributes’ does not name a type
    
     IDeckLinkAttributes *attr;
    
     ^~~~~~~~~~~~~~~~~~~
    
libavdevice/decklink_common.cpp: In function ‘int decklink_get_attr_string(IDeckLink*, BMDDeckLinkAttributeID, const char**)’:
    
libavdevice/decklink_common.cpp:84:5: error: ‘IDeckLinkAttributes’ was not declared in this scope
    
     IDeckLinkAttributes *attr;
    
     ^~~~~~~~~~~~~~~~~~~
    
libavdevice/decklink_common.cpp:84:26: error: ‘attr’ was not declared in this scope
    
     IDeckLinkAttributes *attr;
    
                          ^~~~
    
libavdevice/decklink_common.cpp:86:28: error: ‘IID_IDeckLinkAttributes’ was not declared in this scope
    
     if (dl->QueryInterface(IID_IDeckLinkAttributes, (void **)&attr) != S_OK)
    
                            ^~~~~~~~~~~~~~~~~~~~~~~
    
libavdevice/decklink_common.cpp: In function ‘int decklink_select_input(AVFormatContext*, BMDDeckLinkConfigurationID)’:
    
libavdevice/decklink_common.cpp:112:20: error: ‘struct decklink_ctx’ has no member named ‘attr’
    
         res = ctx->attr->GetInt(attr_id, &supported_connections);
    
                    ^~~~
    
libavdevice/decklink_common.cpp: In function ‘int ff_decklink_set_configs(AVFormatContext*, decklink_direction_t)’:
    
libavdevice/decklink_common.cpp:152:18: error: ‘struct decklink_ctx’ has no member named ‘attr’
    
         if (ctx->attr->GetFlag(BMDDeckLinkSupportsDuplexModeConfiguration, &duplex_supported) != S_OK)
    
                  ^~~~
    
libavdevice/decklink_common.cpp:152:32: error: ‘BMDDeckLinkSupportsDuplexModeConfiguration’ was not declared in this scope
    
         if (ctx->attr->GetFlag(BMDDeckLinkSupportsDuplexModeConfiguration, &duplex_supported) != S_OK)
    
                                ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    
libavdevice/decklink_common.cpp:156:36: error: ‘bmdDeckLinkConfigDuplexMode’ was not declared in this scope
    
             res = ctx->cfg->SetInt(bmdDeckLinkConfigDuplexMode, ctx->duplex_mode == 2 ? bmdDuplexModeFull : bmdDuplexModeHalf);
    
                                    ^~~~~~~~~~~~~~~~~~~~~~~~~~~
    
libavdevice/decklink_common.cpp:156:89: error: ‘bmdDuplexModeFull’ was not declared in this scope
    
             res = ctx->cfg->SetInt(bmdDeckLinkConfigDuplexMode, ctx->duplex_mode == 2 ? bmdDuplexModeFull : bmdDuplexModeHalf);
    
                                                                                         ^~~~~~~~~~~~~~~~~
    
libavdevice/decklink_common.cpp:156:109: error: ‘bmdDuplexModeHalf’ was not declared in this scope
    
             res = ctx->cfg->SetInt(bmdDeckLinkConfigDuplexMode, ctx->duplex_mode == 2 ? bmdDuplexModeFull : bmdDuplexModeHalf);
    
                                                                                                             ^~~~~~~~~~~~~~~~~
    
libavdevice/decklink_common.cpp: In function ‘int ff_decklink_set_format(AVFormatContext*, int, int, int, int, AVFieldOrder, decklink_direction_t, int)’:
    
libavdevice/decklink_common.cpp:190:5: error: ‘BMDDisplayModeSupport’ was not declared in this scope
    
     BMDDisplayModeSupport support;
    
     ^~~~~~~~~~~~~~~~~~~~~
    
libavdevice/decklink_common.cpp:254:45: error: ‘support’ was not declared in this scope
    
                                            &support, NULL) != S_OK)
    
                                             ^~~~~~~
    
libavdevice/decklink_common.cpp:259:68: error: ‘support’ was not declared in this scope
    
                                                                   &support, NULL) != S_OK) {
    
                                                                    ^~~~~~~
    
libavdevice/decklink_common.cpp:270:9: error: ‘support’ was not declared in this scope
    
     if (support == bmdDisplayModeSupported)
    
         ^~~~~~~
    
libavdevice/decklink_common.cpp:270:20: error: ‘bmdDisplayModeSupported’ was not declared in this scope
    
     if (support == bmdDisplayModeSupported)
    
                    ^~~~~~~~~~~~~~~~~~~~~~~
    
libavdevice/decklink_common.cpp: In function ‘void ff_decklink_cleanup(AVFormatContext*)’:
    
libavdevice/decklink_common.cpp:434:14: error: ‘struct decklink_ctx’ has no member named ‘attr’
    
     if (ctx->attr)
    
              ^~~~
    
libavdevice/decklink_common.cpp:435:14: error: ‘struct decklink_ctx’ has no member named ‘attr’
    
         ctx->attr->Release();
    
              ^~~~
    
libavdevice/decklink_common.cpp: In function ‘int ff_decklink_init_device(AVFormatContext*, const char*)’:
    
libavdevice/decklink_common.cpp:476:33: error: ‘IID_IDeckLinkAttributes’ was not declared in this scope
    
     if (ctx->dl->QueryInterface(IID_IDeckLinkAttributes, (void **)&ctx->attr) != S_OK) {
    
                                 ^~~~~~~~~~~~~~~~~~~~~~~
    
libavdevice/decklink_common.cpp:476:73: error: ‘struct decklink_ctx’ has no member named ‘attr’
    
     if (ctx->dl->QueryInterface(IID_IDeckLinkAttributes, (void **)&ctx->attr) != S_OK) {
    
                                                                         ^~~~
    
ffbuild/common.mak:63: recipe for target 'libavdevice/decklink_common.o' failed
    
make: *** [libavdevice/decklink_common.o] Error 1

  • avformat/aviobuf : Add ffio_init_(read|write)_context()

    2 septembre 2023, par Andreas Rheinhardt
    avformat/aviobuf : Add ffio_init_(read|write)_context()

    Most users of ffio_init_context() simply want to wrap
    
a buffer into an AVIOContext ; they do not provide
    
function pointers at all.
    

    Therefore this commit adds shortcuts for these two common
    
operations. This also allows to accept const data when reading
    
(i.e. the const is now cast away at a central place in
    
ffio_init_read_context() instead of at several callers).
    
This also allows to constify the data in ff_text_init_buf().
    

    Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
    • [DH] libavformat/aacdec.c
    • [DH] libavformat/asfenc.c
    • [DH] libavformat/av1.c
    • [DH] libavformat/av1dec.c
    • [DH] libavformat/avio_internal.h
    • [DH] libavformat/aviobuf.c
    • [DH] libavformat/hls.c
    • [DH] libavformat/id3v2.c
    • [DH] libavformat/matroskadec.c
    • [DH] libavformat/mmst.c
    • [DH] libavformat/mov.c
    • [DH] libavformat/mpegts.c
    • [DH] libavformat/mpjpegdec.c
    • [DH] libavformat/oggenc.c
    • [DH] libavformat/rdt.c
    • [DH] libavformat/rtpdec_asf.c
    • [DH] libavformat/rtpdec_qt.c
    • [DH] libavformat/rtsp.c
    • [DH] libavformat/sapdec.c
    • [DH] libavformat/subtitles.c
    • [DH] libavformat/subtitles.h
    • [DH] libavformat/vividas.c

  • I can't compile ffmpeg, don't know how to install sdl2 properly

    11 mai 2019, par woopwoop399

    I’m compiling ffmpeg, on windows, with mingw-w64, and I need SDL2 so that the ffplay in ffmpeg compiles. I installed mingw-w64 using the web installer, I installed msys (to run the ./configure that comes with ffmpeg) using the all in one package provided by mingw-w64. I installed SDL2 by downloading dev binaries from their site and running make native in msys.

    So, it seems SDL2 isn’t installed properly or something.

    Here is the problematic part in ./configure :

    if enabled sdl2; then
    
    echo "SDL2-1"
    
    SDL2_CONFIG="${cross_prefix}sdl2-config"
    
    test_pkg_config sdl2 "sdl2 >= 2.0.1 sdl2 &lt; 2.1.0" SDL_events.h SDL_PollEvent
    
    echo "SDL2-2"
    
    if disabled sdl2 &amp;&amp; "${SDL2_CONFIG}" --version > /dev/null 2>&amp;1; then
    
        echo "SDL2-3"
    
        sdl2_cflags=$("${SDL2_CONFIG}" --cflags)
    
        sdl2_extralibs=$("${SDL2_CONFIG}" --libs)
    
        echo "SDL2-config ${SDL2_CONFIG}"
    
        echo "SDL2-cflags ${sdl2_cflags}"
    
        echo "SDL2-libs ${sdl2_extralibs}"
    
        test_cpp_condition SDL.h "(SDL_MAJOR_VERSION&lt;&lt;16 | SDL_MINOR_VERSION&lt;&lt;8 | SDL_PATCHLEVEL) >= 0x020001" $sdl2_cflags &amp;&amp;
    
        echo "SDL2-4" &amp;&amp;
    
        test_cpp_condition SDL.h "(SDL_MAJOR_VERSION&lt;&lt;16 | SDL_MINOR_VERSION&lt;&lt;8 | SDL_PATCHLEVEL) &lt; 0x020100" $sdl2_cflags &amp;&amp;
    
        echo "SDL2-5" &amp;&amp;
    
        check_func_headers SDL_events.h SDL_PollEvent $sdl2_extralibs $sdl2_cflags &amp;&amp;
    
        echo "SDL2-6-final" &amp;&amp;
    
            enable sdl2
    
    fi
    
    if test $target_os = "mingw32"; then
    
        sdl2_extralibs=$(filter_out '-mwindows' $sdl2_extralibs)
    
    fi
    
fi

    This is the result of it, it never gets to SDL2-6-final and enable sdl2

    SDL2-1
    
SDL2-2
    
SDL2-3
    
SDL2-config sdl2-config
    
SDL2-cflags -I/usr/include/SDL2 -Dmain=SDL_main
    
SDL2-libs -L/usr/lib -lmingw32 -lSDL2main -lSDL2 -mwindows
    
SDL2-4
    
SDL2-5

    This is the sdl2 installation log :

    User@NEW-PC /c/Users/User/Downloads/games/compilers/SDL2-2.0.9
    
$ make native
    
make install-package arch=i686-w64-mingw32 prefix=/usr
    
make[1]: Entering directory `/c/Users/User/Downloads/games/compilers/SDL2-2.0.9'
    
`bin/sdl2-config' -> `/usr/bin/sdl2-config'
    
`bin/SDL2.dll' -> `/usr/bin/SDL2.dll'
    
`include' -> `/usr/include'
    
`include/SDL2' -> `/usr/include/SDL2'
    
`include/SDL2/begin_code.h' -> `/usr/include/SDL2/begin_code.h'
    
`include/SDL2/close_code.h' -> `/usr/include/SDL2/close_code.h'
    
`include/SDL2/SDL.h' -> `/usr/include/SDL2/SDL.h'
    
`include/SDL2/SDL_assert.h' -> `/usr/include/SDL2/SDL_assert.h'
    
`include/SDL2/SDL_atomic.h' -> `/usr/include/SDL2/SDL_atomic.h'
    
`include/SDL2/SDL_audio.h' -> `/usr/include/SDL2/SDL_audio.h'
    
`include/SDL2/SDL_bits.h' -> `/usr/include/SDL2/SDL_bits.h'
    
`include/SDL2/SDL_blendmode.h' -> `/usr/include/SDL2/SDL_blendmode.h'
    
`include/SDL2/SDL_clipboard.h' -> `/usr/include/SDL2/SDL_clipboard.h'
    
`include/SDL2/SDL_config.h' -> `/usr/include/SDL2/SDL_config.h'
    
`include/SDL2/SDL_cpuinfo.h' -> `/usr/include/SDL2/SDL_cpuinfo.h'
    
`include/SDL2/SDL_egl.h' -> `/usr/include/SDL2/SDL_egl.h'
    
`include/SDL2/SDL_endian.h' -> `/usr/include/SDL2/SDL_endian.h'
    
`include/SDL2/SDL_error.h' -> `/usr/include/SDL2/SDL_error.h'
    
`include/SDL2/SDL_events.h' -> `/usr/include/SDL2/SDL_events.h'
    
`include/SDL2/SDL_filesystem.h' -> `/usr/include/SDL2/SDL_filesystem.h'
    
`include/SDL2/SDL_gamecontroller.h' -> `/usr/include/SDL2/SDL_gamecontroller.h'
    
`include/SDL2/SDL_gesture.h' -> `/usr/include/SDL2/SDL_gesture.h'
    
`include/SDL2/SDL_haptic.h' -> `/usr/include/SDL2/SDL_haptic.h'
    
`include/SDL2/SDL_hints.h' -> `/usr/include/SDL2/SDL_hints.h'
    
`include/SDL2/SDL_joystick.h' -> `/usr/include/SDL2/SDL_joystick.h'
    
`include/SDL2/SDL_keyboard.h' -> `/usr/include/SDL2/SDL_keyboard.h'
    
`include/SDL2/SDL_keycode.h' -> `/usr/include/SDL2/SDL_keycode.h'
    
`include/SDL2/SDL_loadso.h' -> `/usr/include/SDL2/SDL_loadso.h'
    
`include/SDL2/SDL_log.h' -> `/usr/include/SDL2/SDL_log.h'
    
`include/SDL2/SDL_main.h' -> `/usr/include/SDL2/SDL_main.h'
    
`include/SDL2/SDL_messagebox.h' -> `/usr/include/SDL2/SDL_messagebox.h'
    
`include/SDL2/SDL_mouse.h' -> `/usr/include/SDL2/SDL_mouse.h'
    
`include/SDL2/SDL_mutex.h' -> `/usr/include/SDL2/SDL_mutex.h'
    
`include/SDL2/SDL_name.h' -> `/usr/include/SDL2/SDL_name.h'
    
`include/SDL2/SDL_opengl.h' -> `/usr/include/SDL2/SDL_opengl.h'
    
`include/SDL2/SDL_opengles.h' -> `/usr/include/SDL2/SDL_opengles.h'
    
`include/SDL2/SDL_opengles2.h' -> `/usr/include/SDL2/SDL_opengles2.h'
    
`include/SDL2/SDL_opengles2_gl2.h' -> `/usr/include/SDL2/SDL_opengles2_gl2.h'
    
`include/SDL2/SDL_opengles2_gl2ext.h' -> `/usr/include/SDL2/SDL_opengles2_gl2ext.h'
    
`include/SDL2/SDL_opengles2_gl2platform.h' -> `/usr/include/SDL2/SDL_opengles2_gl2platform.h'
    
`include/SDL2/SDL_opengles2_khrplatform.h' -> `/usr/include/SDL2/SDL_opengles2_khrplatform.h'
    
`include/SDL2/SDL_opengl_glext.h' -> `/usr/include/SDL2/SDL_opengl_glext.h'
    
`include/SDL2/SDL_pixels.h' -> `/usr/include/SDL2/SDL_pixels.h'
    
`include/SDL2/SDL_platform.h' -> `/usr/include/SDL2/SDL_platform.h'
    
`include/SDL2/SDL_power.h' -> `/usr/include/SDL2/SDL_power.h'
    
`include/SDL2/SDL_quit.h' -> `/usr/include/SDL2/SDL_quit.h'
    
`include/SDL2/SDL_rect.h' -> `/usr/include/SDL2/SDL_rect.h'
    
`include/SDL2/SDL_render.h' -> `/usr/include/SDL2/SDL_render.h'
    
`include/SDL2/SDL_revision.h' -> `/usr/include/SDL2/SDL_revision.h'
    
`include/SDL2/SDL_rwops.h' -> `/usr/include/SDL2/SDL_rwops.h'
    
`include/SDL2/SDL_scancode.h' -> `/usr/include/SDL2/SDL_scancode.h'
    
`include/SDL2/SDL_sensor.h' -> `/usr/include/SDL2/SDL_sensor.h'
    
`include/SDL2/SDL_shape.h' -> `/usr/include/SDL2/SDL_shape.h'
    
`include/SDL2/SDL_stdinc.h' -> `/usr/include/SDL2/SDL_stdinc.h'
    
`include/SDL2/SDL_surface.h' -> `/usr/include/SDL2/SDL_surface.h'
    
`include/SDL2/SDL_system.h' -> `/usr/include/SDL2/SDL_system.h'
    
`include/SDL2/SDL_syswm.h' -> `/usr/include/SDL2/SDL_syswm.h'
    
`include/SDL2/SDL_test.h' -> `/usr/include/SDL2/SDL_test.h'
    
`include/SDL2/SDL_test_assert.h' -> `/usr/include/SDL2/SDL_test_assert.h'
    
`include/SDL2/SDL_test_common.h' -> `/usr/include/SDL2/SDL_test_common.h'
    
`include/SDL2/SDL_test_compare.h' -> `/usr/include/SDL2/SDL_test_compare.h'
    
`include/SDL2/SDL_test_crc32.h' -> `/usr/include/SDL2/SDL_test_crc32.h'
    
`include/SDL2/SDL_test_font.h' -> `/usr/include/SDL2/SDL_test_font.h'
    
`include/SDL2/SDL_test_fuzzer.h' -> `/usr/include/SDL2/SDL_test_fuzzer.h'
    
`include/SDL2/SDL_test_harness.h' -> `/usr/include/SDL2/SDL_test_harness.h'
    
`include/SDL2/SDL_test_images.h' -> `/usr/include/SDL2/SDL_test_images.h'
    
`include/SDL2/SDL_test_log.h' -> `/usr/include/SDL2/SDL_test_log.h'
    
`include/SDL2/SDL_test_md5.h' -> `/usr/include/SDL2/SDL_test_md5.h'
    
`include/SDL2/SDL_test_memory.h' -> `/usr/include/SDL2/SDL_test_memory.h'
    
`include/SDL2/SDL_test_random.h' -> `/usr/include/SDL2/SDL_test_random.h'
    
`include/SDL2/SDL_thread.h' -> `/usr/include/SDL2/SDL_thread.h'
    
`include/SDL2/SDL_timer.h' -> `/usr/include/SDL2/SDL_timer.h'
    
`include/SDL2/SDL_touch.h' -> `/usr/include/SDL2/SDL_touch.h'
    
`include/SDL2/SDL_types.h' -> `/usr/include/SDL2/SDL_types.h'
    
`include/SDL2/SDL_version.h' -> `/usr/include/SDL2/SDL_version.h'
    
`include/SDL2/SDL_video.h' -> `/usr/include/SDL2/SDL_video.h'
    
`include/SDL2/SDL_vulkan.h' -> `/usr/include/SDL2/SDL_vulkan.h'
    
`lib/cmake' -> `/usr/lib/cmake'
    
`lib/cmake/SDL2' -> `/usr/lib/cmake/SDL2'
    
`lib/cmake/SDL2/sdl2-config.cmake' -> `/usr/lib/cmake/SDL2/sdl2-config.cmake'
    
`lib/libSDL2.a' -> `/usr/lib/libSDL2.a'
    
`lib/libSDL2.dll.a' -> `/usr/lib/libSDL2.dll.a'
    
`lib/libSDL2.la' -> `/usr/lib/libSDL2.la'
    
`lib/libSDL2main.a' -> `/usr/lib/libSDL2main.a'
    
`lib/libSDL2main.la' -> `/usr/lib/libSDL2main.la'
    
`lib/libSDL2_test.a' -> `/usr/lib/libSDL2_test.a'
    
`lib/libSDL2_test.la' -> `/usr/lib/libSDL2_test.la'
    
`lib/pkgconfig' -> `/usr/lib/pkgconfig'
    
`lib/pkgconfig/sdl2.pc' -> `/usr/lib/pkgconfig/sdl2.pc'
    
`share/aclocal/sdl2.m4' -> `/usr/share/aclocal/sdl2.m4'
    
make[1]: Leaving directory `/c/Users/User/Downloads/games/compilers/SDL2-2.0.9'

    And this is what happens when I just comment out that last check in ./configure and enable sdl2 anyway :

    c:/Program Files/mingw-w64/x86_64-8.1.0-win32-seh-rt_v6-rev0/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/8.1.0/../../../../x86_64-w64-mingw32/bin/ld.exe: skipping incompatible C:/msys/lib/libSDL2main.a when searching for -lSDL2main

    c:/Program Files/mingw-w64/x86_64-8.1.0-win32-seh-rt_v6-rev0/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/8.1.0/../../../../x86_64-w64-mingw32/bin/ld.exe: skipping incompatible C:/msys/lib/libSDL2.dll.a when searching for -lSDL2

    c:/Program Files/mingw-w64/x86_64-8.1.0-win32-seh-rt_v6-rev0/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/8.1.0/../../../../x86_64-w64-mingw32/bin/ld.exe: cannot find -lSDL2

    I tried using msys2 instead, it compiles, but the debugger there doesn’t work for some reason. I need to run the source code of ffmpeg in debugger to have a chance of understanding anything there. I need to use the combination of codeblocks and gdb, and programs compiled with msys2 use weird pathnames like /c/bla/bla/bla/main.c, and codeblocks is righteously weirded out by that. The mingw-w64 uses more sane pathnames, I just checked that.

    Checked ffbuild/config.log, the problem is here :

    `c:/Program Files/mingw-w64/x86_64-8.1.0-win32-seh-rt_v6-rev0/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/8.1.0/../../../../x86_64-w64-mingw32/bin/ld.exe: cannot find -lSDL2`

    More in full :

    test_pkg_config sdl2 sdl2 >= 2.0.1 sdl2 &lt; 2.1.0 SDL_events.h SDL_PollEvent
    
pkg-config --exists --print-errors sdl2 >= 2.0.1 sdl2 &lt; 2.1.0
    
check_func_headers SDL_events.h SDL_PollEvent -Dmain=SDL_main -IC:/msys/include/SDL2 -mwindows -LC:/msys/lib -lmingw32 -lSDL2main -lSDL2
    
test_ld cc -Dmain=SDL_main -IC:/msys/include/SDL2 -mwindows -LC:/msys/lib -lmingw32 -lSDL2main -lSDL2
    
test_cc -Dmain=SDL_main -IC:/msys/include/SDL2 -mwindows -LC:/msys/lib
    
BEGIN /tmp/ffconf.atBoPojc/test.c
    
    1   #include 
    
    2   #include 
    
    3   long check_SDL_PollEvent(void) { return (long) SDL_PollEvent; }
    
    4   int main(void) { int ret = 0;
    
    5    ret |= ((intptr_t)check_SDL_PollEvent) &amp; 0xFFFF;
    
    6   return ret; }
    
END /tmp/ffconf.atBoPojc/test.c
    
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 -Dmain=SDL_main -IC:/msys/include/SDL2 -mwindows -LC:/msys/lib -c -o /tmp/ffconf.atBoPojc/test.o /tmp/ffconf.atBoPojc/test.c
    
C:/Users/User/AppData/Local/Temp/ffconf.atBoPojc/test.c: In function 'check_SDL_PollEvent':
    
C:/Users/User/AppData/Local/Temp/ffconf.atBoPojc/test.c:3:41: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
    
 long check_SDL_PollEvent(void) { return (long) SDL_PollEvent; }
    
                                         ^
    
gcc -Wl,--nxcompat,--dynamicbase -Wl,--high-entropy-va -Wl,--as-needed -Wl,--image-base,0x140000000 -Dmain=SDL_main -IC:/msys/include/SDL2 -mwindows -LC:/msys/lib -o /tmp/ffconf.atBoPojc/test.exe /tmp/ffconf.atBoPojc/test.o -lmingw32 -lSDL2main -lSDL2
    
c:/Program Files/mingw-w64/x86_64-8.1.0-win32-seh-rt_v6-rev0/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/8.1.0/../../../../x86_64-w64-mingw32/bin/ld.exe: skipping incompatible C:/msys/lib/libSDL2main.a when searching for -lSDL2main
    
c:/Program Files/mingw-w64/x86_64-8.1.0-win32-seh-rt_v6-rev0/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/8.1.0/../../../../x86_64-w64-mingw32/bin/ld.exe: skipping incompatible C:/msys/lib\libSDL2main.a when searching for -lSDL2main
    
c:/Program Files/mingw-w64/x86_64-8.1.0-win32-seh-rt_v6-rev0/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/8.1.0/../../../../x86_64-w64-mingw32/bin/ld.exe: skipping incompatible C:/msys/lib/libSDL2main.a when searching for -lSDL2main
    
c:/Program Files/mingw-w64/x86_64-8.1.0-win32-seh-rt_v6-rev0/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/8.1.0/../../../../x86_64-w64-mingw32/bin/ld.exe: cannot find -lSDL2main
    
c:/Program Files/mingw-w64/x86_64-8.1.0-win32-seh-rt_v6-rev0/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/8.1.0/../../../../x86_64-w64-mingw32/bin/ld.exe: skipping incompatible C:/msys/lib/libSDL2.dll.a when searching for -lSDL2
    
c:/Program Files/mingw-w64/x86_64-8.1.0-win32-seh-rt_v6-rev0/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/8.1.0/../../../../x86_64-w64-mingw32/bin/ld.exe: skipping incompatible C:/msys/lib/libSDL2.a when searching for -lSDL2
    
c:/Program Files/mingw-w64/x86_64-8.1.0-win32-seh-rt_v6-rev0/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/8.1.0/../../../../x86_64-w64-mingw32/bin/ld.exe: skipping incompatible C:/msys/lib\libSDL2.a when searching for -lSDL2
    
c:/Program Files/mingw-w64/x86_64-8.1.0-win32-seh-rt_v6-rev0/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/8.1.0/../../../../x86_64-w64-mingw32/bin/ld.exe: skipping incompatible C:/msys/lib/libSDL2.dll.a when searching for -lSDL2
    
c:/Program Files/mingw-w64/x86_64-8.1.0-win32-seh-rt_v6-rev0/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/8.1.0/../../../../x86_64-w64-mingw32/bin/ld.exe: skipping incompatible C:/msys/lib/libSDL2.a when searching for -lSDL2
    
c:/Program Files/mingw-w64/x86_64-8.1.0-win32-seh-rt_v6-rev0/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/8.1.0/../../../../x86_64-w64-mingw32/bin/ld.exe: cannot find -lSDL2
    
collect2.exe: error: ld returned 1 exit status

    Okay, I managed to compile. I removed the sdl libraries from C:/msys/lib, and added them to C:\Program Files\mingw-w64\x86_64-8.1.0-win32-seh-rt_v6-rev0\mingw64\lib

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