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  • Failed to compile x264 library for android, error description : clang:error no such file or directory

    12 janvier 2019, par Lee.Saipeng

    I use a shell script to compile the x264 library to the android platform, the architecture is armeabi-v7a,The x264 library was cloned from github。

    I am sure I have those directories,and I checked the search engine such as google,No one encountered the same situation

    ANDROID_NDK=/Users/Project/devtools/android-sdk-macosx/android-ndk-r16b
    
SYSROOT=$ANDROID_NDK/platforms/android-16/arch-arm
    
CROSS_PREFIX=$ANDROID_NDK/toolchains/arm-linux-androideabi- 
    
4.9/prebuilt/linux-x86_64/bin/arm-linux-androideabi-
    
EXTRA_CFLAGS="-march=armv7-a -mfloat-abi=softfp -mfpu=neon - 
    
D__ANDROID__ -D__ARM_ARCH_7__ -D__ARM_ARCH_7A__"
    
EXTRA_LDFLAGS="-nostdlib"
    
PREFIX=`pwd`/libs/armeabi-v7a
    

    
./configure --prefix=$PREFIX \
    
    --host=arm-linux \
    
    --sysroot=$SYSROOT \
    
    --cross-prefix=$CROSS_PREFIX \
    
    --extra-cflags="$EXTRA_CFLAGS" \
    
    --extra-ldflags="$EXTRA_LDFLAGS" \
    
    --enable-pic \
    
    --enable-static \
    
    --enable-strip \
    
    --disable-cli \
    
    --disable-asm
    
   # --disable-win32thread \
    
   # --disable-avs \
    
   # --disable-swscale \
    
   # --disable-lavf \
    
   # --disable-ffms \
    
   # --disable-gpac \
    
   # --disable-lsmash \
    
   # --disable-opencl
    

    
make clean
    
make STRIP= -j8 install || exit 1
    

    
cp -f $PREFIX/libx264.a $PREFIX

    The error is here
    enter image description here
    The result is that this x264 library cannot be used. Can someone help me ? thanks very much

    Ok, I generated the config.log file during the compilation of x264, I hope it is an error log file, the log content is as follows :

    checking for -Werror=unknown-warning-option... no
    
Failed commandline was:
    
--------------------------------------------------
    
/Users/Project/devtools/android-sdk-macosx/android-ndk-r16b/toolchains/arm-linux-androideabi-4.9/prebuilt/darwin-x86_64/bin/arm-linux-androideabi-gcc conftest.c  -Wall -I. -I$(SRCPATH) --sysroot=/Users/Project/devtools/android-sdk-macosx/android-ndk-r16b/platforms/android-16/arch-arm -march=armv5te -msoft-float -D__ANDROID__ -D__ARM_ARCH_5TE__ -D__ARM_ARCH_5TEJ__  -Werror=unknown-warning-option   --sysroot=/Users/Project/devtools/android-sdk-macosx/android-ndk-r16b/platforms/android-16/arch-arm -nostdlib -o conftest
    
cc1: error: -Werror=unknown-warning-option: no option -Wunknown-warning-option
    
--------------------------------------------------
    
Failed program was:
    
--------------------------------------------------
    
int main (void) {  return 0; }
    
--------------------------------------------------
    
x264 configure script
    
Command line options: "--prefix=/Users/Project/bishe/x264/libs/armeabi-v7a" "--host=arm-linux" "--sysroot=/Users/Project/devtools/android-sdk-macosx/android-ndk-r16b/platforms/android-16/arch-arm" "--cross-prefix=/Users/Project/devtools/android-sdk-macosx/android-ndk-r16b/toolchains/arm-linux-androideabi-4.9/prebuilt/darwin-x86_64/bin/arm-linux-androideabi-" "--extra-cflags=-march=armv5te" "-msoft-float" "-D__ANDROID__" "-D__ARM_ARCH_5TE__" "-D__ARM_ARCH_5TEJ__" "--extra-ldflags=-nostdlib" "--enable-pic" "--enable-static" "--enable-strip" "--disable-cli" "--disable-asm" "--disable-win32thread" "--disable-avs" "--disable-swscale" "--disable-lavf" "--disable-ffms" "--disable-gpac" "--disable-lsmash" "--disable-opencl"
    

    
checking whether /Users/Project/devtools/android-sdk-macosx/android-ndk-r16b/toolchains/arm-linux-androideabi-4.9/prebuilt/darwin-x86_64/bin/arm-linux-androideabi-gcc works... yes
    
checking whether /Users/Project/devtools/android-sdk-macosx/android-ndk-r16b/toolchains/arm-linux-androideabi-4.9/prebuilt/darwin-x86_64/bin/arm-linux-androideabi-gcc supports for( int i = 0; i < 9; i++ ); with -std=gnu99... yes
    
checking for pthread_create(0,0,0,0); in pthread.h... no
    
Failed commandline was:
    
--------------------------------------------------
    
/Users/Project/devtools/android-sdk-macosx/android-ndk-r16b/toolchains/arm-linux-androideabi-4.9/prebuilt/darwin-x86_64/bin/arm-linux-androideabi-gcc conftest.c  -Wall -I. -I$(SRCPATH) --sysroot=/Users/Project/devtools/android-sdk-macosx/android-ndk-r16b/platforms/android-16/arch-arm -march=armv5te -msoft-float -D__ANDROID__ -D__ARM_ARCH_5TE__ -D__ARM_ARCH_5TEJ__ -std=gnu99 -D_GNU_SOURCE  -lpthread   --sysroot=/Users/Project/devtools/android-sdk-macosx/android-ndk-r16b/platforms/android-16/arch-arm -nostdlib -lm -o conftest
    
conftest.c:1:21: fatal error: pthread.h: No such file or directory
    
 #include 
    
                     ^
    
compilation terminated.
    
--------------------------------------------------
    
Failed program was:
    
--------------------------------------------------
    
#include 
    
int main (void) { pthread_create(0,0,0,0); return 0; }
    
--------------------------------------------------
    
checking for pthread_create(0,0,0,0); in pthread.h... no
    
Failed commandline was:
    
--------------------------------------------------
    
/Users/Project/devtools/android-sdk-macosx/android-ndk-r16b/toolchains/arm-linux-androideabi-4.9/prebuilt/darwin-x86_64/bin/arm-linux-androideabi-gcc conftest.c  -Wall -I. -I$(SRCPATH) --sysroot=/Users/Project/devtools/android-sdk-macosx/android-ndk-r16b/platforms/android-16/arch-arm -march=armv5te -msoft-float -D__ANDROID__ -D__ARM_ARCH_5TE__ -D__ARM_ARCH_5TEJ__ -std=gnu99 -D_GNU_SOURCE     --sysroot=/Users/Project/devtools/android-sdk-macosx/android-ndk-r16b/platforms/android-16/arch-arm -nostdlib -lm -o conftest
    
conftest.c:1:21: fatal error: pthread.h: No such file or directory
    
 #include 
    
                     ^
    
compilation terminated.
    
--------------------------------------------------
    
Failed program was:
    
--------------------------------------------------
    
#include 
    
int main (void) { pthread_create(0,0,0,0); return 0; }
    
--------------------------------------------------
    
checking for log2f(2); in math.h... no
    
Failed commandline was:
    
--------------------------------------------------
    
/Users/Project/devtools/android-sdk-macosx/android-ndk-r16b/toolchains/arm-linux-androideabi-4.9/prebuilt/darwin-x86_64/bin/arm-linux-androideabi-gcc conftest.c  -Wall -I. -I$(SRCPATH) --sysroot=/Users/Project/devtools/android-sdk-macosx/android-ndk-r16b/platforms/android-16/arch-arm -march=armv5te -msoft-float -D__ANDROID__ -D__ARM_ARCH_5TE__ -D__ARM_ARCH_5TEJ__ -std=gnu99 -D_GNU_SOURCE     --sysroot=/Users/Project/devtools/android-sdk-macosx/android-ndk-r16b/platforms/android-16/arch-arm -nostdlib -lm -o conftest
    
conftest.c:1:18: fatal error: math.h: No such file or directory
    
 #include 
    
                  ^
    
compilation terminated.
    
--------------------------------------------------
    
Failed program was:
    
--------------------------------------------------
    
#include 
    
int main (void) { log2f(2); return 0; }
    
--------------------------------------------------
    
checking for strtok_r(0, 0, 0); in string.h... no
    
Failed commandline was:
    
--------------------------------------------------
    
/Users/Project/devtools/android-sdk-macosx/android-ndk-r16b/toolchains/arm-linux-androideabi-4.9/prebuilt/darwin-x86_64/bin/arm-linux-androideabi-gcc conftest.c  -Wall -I. -I$(SRCPATH) --sysroot=/Users/Project/devtools/android-sdk-macosx/android-ndk-r16b/platforms/android-16/arch-arm -march=armv5te -msoft-float -D__ANDROID__ -D__ARM_ARCH_5TE__ -D__ARM_ARCH_5TEJ__ -std=gnu99 -D_GNU_SOURCE     --sysroot=/Users/Project/devtools/android-sdk-macosx/android-ndk-r16b/platforms/android-16/arch-arm -nostdlib -lm -o conftest
    
conftest.c:1:20: fatal error: string.h: No such file or directory
    
 #include 
    
                    ^
    
compilation terminated.
    
--------------------------------------------------
    
Failed program was:
    
--------------------------------------------------
    
#include 
    
int main (void) { strtok_r(0, 0, 0); return 0; }
    
--------------------------------------------------
    
checking for clock_gettime(CLOCK_MONOTONIC, 0); in time.h... no
    
Failed commandline was:
    
--------------------------------------------------
    
/Users/Project/devtools/android-sdk-macosx/android-ndk-r16b/toolchains/arm-linux-androideabi-4.9/prebuilt/darwin-x86_64/bin/arm-linux-androideabi-gcc conftest.c  -Wall -I. -I$(SRCPATH) --sysroot=/Users/Project/devtools/android-sdk-macosx/android-ndk-r16b/platforms/android-16/arch-arm -march=armv5te -msoft-float -D__ANDROID__ -D__ARM_ARCH_5TE__ -D__ARM_ARCH_5TEJ__ -std=gnu99 -D_GNU_SOURCE     --sysroot=/Users/Project/devtools/android-sdk-macosx/android-ndk-r16b/platforms/android-16/arch-arm -nostdlib -lm -o conftest
    
conftest.c:1:18: fatal error: time.h: No such file or directory
    
 #include 
    
                  ^
    
compilation terminated.
    
--------------------------------------------------
    
Failed program was:
    
--------------------------------------------------
    
#include 
    
int main (void) { clock_gettime(CLOCK_MONOTONIC, 0); return 0; }
    
--------------------------------------------------
    
checking for clock_gettime(CLOCK_MONOTONIC, 0); in time.h... no
    
Failed commandline was:
    
--------------------------------------------------
    
/Users/Project/devtools/android-sdk-macosx/android-ndk-r16b/toolchains/arm-linux-androideabi-4.9/prebuilt/darwin-x86_64/bin/arm-linux-androideabi-gcc conftest.c  -Wall -I. -I$(SRCPATH) --sysroot=/Users/Project/devtools/android-sdk-macosx/android-ndk-r16b/platforms/android-16/arch-arm -march=armv5te -msoft-float -D__ANDROID__ -D__ARM_ARCH_5TE__ -D__ARM_ARCH_5TEJ__ -std=gnu99 -D_GNU_SOURCE  -lrt   --sysroot=/Users/Project/devtools/android-sdk-macosx/android-ndk-r16b/platforms/android-16/arch-arm -nostdlib -lm -o conftest
    
conftest.c:1:18: fatal error: time.h: No such file or directory
    
 #include 
    
                  ^
    
compilation terminated.
    
--------------------------------------------------
    
Failed program was:
    
--------------------------------------------------
    
#include 
    
int main (void) { clock_gettime(CLOCK_MONOTONIC, 0); return 0; }
    
--------------------------------------------------
    
checking whether defined(MAP_PRIVATE) is true... no
    
--------------------------------------------------
    
conftest.c:1:22: fatal error: sys/mman.h: No such file or directory
    
 #include <sys></sys>mman.h>
    
                      ^
    
compilation terminated.
    
--------------------------------------------------
    
Failed program was:
    
--------------------------------------------------
    
#include <sys></sys>mman.h>
    
#include 
    
#if !(defined(MAP_PRIVATE)) 
    
#error  
    
#endif 
    
--------------------------------------------------
    
checking for uint32_t test_vec __attribute__ ((vector_size (16))) = {0,1,2,3}; in stdint.h... no
    
Failed commandline was:
    
--------------------------------------------------
    
/Users/Project/devtools/android-sdk-macosx/android-ndk-r16b/toolchains/arm-linux-androideabi-4.9/prebuilt/darwin-x86_64/bin/arm-linux-androideabi-gcc conftest.c  -Wall -I. -I$(SRCPATH) --sysroot=/Users/Project/devtools/android-sdk-macosx/android-ndk-r16b/platforms/android-16/arch-arm -march=armv5te -msoft-float -D__ANDROID__ -D__ARM_ARCH_5TE__ -D__ARM_ARCH_5TEJ__ -std=gnu99 -D_GNU_SOURCE     --sysroot=/Users/Project/devtools/android-sdk-macosx/android-ndk-r16b/platforms/android-16/arch-arm -nostdlib -lm -o conftest
    
In file included from conftest.c:1:0:
    
/Users/Project/devtools/android-sdk-macosx/android-ndk-r16b/toolchains/arm-linux-androideabi-4.9/prebuilt/darwin-x86_64/lib/gcc/arm-linux-androideabi/4.9.x/include/stdint.h:9:26: fatal error: stdint.h: No such file or directory
    
 # include_next 
    
                          ^
    
compilation terminated.
    
--------------------------------------------------
    
Failed program was:
    
--------------------------------------------------
    
#include 
    
int main (void) { uint32_t test_vec __attribute__ ((vector_size (16))) = {0,1,2,3}; return 0; }
    
--------------------------------------------------
    
checking for stdio.h... no
    
Failed commandline was:
    
--------------------------------------------------
    
/Users/Project/devtools/android-sdk-macosx/android-ndk-r16b/toolchains/arm-linux-androideabi-4.9/prebuilt/darwin-x86_64/bin/arm-linux-androideabi-gcc conftest.c  -Wall -I. -I$(SRCPATH) --sysroot=/Users/Project/devtools/android-sdk-macosx/android-ndk-r16b/platforms/android-16/arch-arm -march=armv5te -msoft-float -D__ANDROID__ -D__ARM_ARCH_5TE__ -D__ARM_ARCH_5TEJ__ -std=gnu99 -D_GNU_SOURCE -fPIC  -shared -Wl,-Bsymbolic   --sysroot=/Users/Project/devtools/android-sdk-macosx/android-ndk-r16b/platforms/android-16/arch-arm -nostdlib -lm -o conftest
    
conftest.c:1:19: fatal error: stdio.h: No such file or directory
    
 #include 
    
                   ^
    
compilation terminated.
    
--------------------------------------------------
    
Failed program was:
    
--------------------------------------------------
    
#include 
    
int main (void) {  return 0; }
    
--------------------------------------------------
    
checking for -fno-tree-vectorize... yes
    
checking for fseeko(stdin,0,0); in stdio.h... no
    
Failed commandline was:
    
--------------------------------------------------
    
/Users/Project/devtools/android-sdk-macosx/android-ndk-r16b/toolchains/arm-linux-androideabi-4.9/prebuilt/darwin-x86_64/bin/arm-linux-androideabi-gcc conftest.c -O3 -ffast-math  -Wall -I. -I$(SRCPATH) --sysroot=/Users/Project/devtools/android-sdk-macosx/android-ndk-r16b/platforms/android-16/arch-arm -march=armv5te -msoft-float -D__ANDROID__ -D__ARM_ARCH_5TE__ -D__ARM_ARCH_5TEJ__ -std=gnu99 -D_GNU_SOURCE -fPIC -fomit-frame-pointer -fno-tree-vectorize     --sysroot=/Users/Project/devtools/android-sdk-macosx/android-ndk-r16b/platforms/android-16/arch-arm -nostdlib -lm -s -o conftest
    
conftest.c:1:19: fatal error: stdio.h: No such file or directory
    
 #include 
    
                   ^
    
compilation terminated.
    
--------------------------------------------------
    
Failed program was:
    
--------------------------------------------------
    
#include 
    
int main (void) { fseeko(stdin,0,0); return 0; }
    
--------------------------------------------------
    
checking for fseeko64(stdin,0,0); in stdio.h... no
    
Failed commandline was:
    
--------------------------------------------------
    
/Users/Project/devtools/android-sdk-macosx/android-ndk-r16b/toolchains/arm-linux-androideabi-4.9/prebuilt/darwin-x86_64/bin/arm-linux-androideabi-gcc conftest.c -O3 -ffast-math  -Wall -I. -I$(SRCPATH) --sysroot=/Users/Project/devtools/android-sdk-macosx/android-ndk-r16b/platforms/android-16/arch-arm -march=armv5te -msoft-float -D__ANDROID__ -D__ARM_ARCH_5TE__ -D__ARM_ARCH_5TEJ__ -std=gnu99 -D_GNU_SOURCE -fPIC -fomit-frame-pointer -fno-tree-vectorize     --sysroot=/Users/Project/devtools/android-sdk-macosx/android-ndk-r16b/platforms/android-16/arch-arm -nostdlib -lm -s -o conftest
    
conftest.c:1:19: fatal error: stdio.h: No such file or directory
    
 #include 
    
                   ^
    
compilation terminated.
    
--------------------------------------------------
    
Failed program was:
    
--------------------------------------------------
    
#include 
    
int main (void) { fseeko64(stdin,0,0); return 0; }
    
--------------------------------------------------
    
checking for _fseeki64(stdin,0,0); in stdio.h... no
    
Failed commandline was:
    
--------------------------------------------------
    
/Users/Project/devtools/android-sdk-macosx/android-ndk-r16b/toolchains/arm-linux-androideabi-4.9/prebuilt/darwin-x86_64/bin/arm-linux-androideabi-gcc conftest.c -O3 -ffast-math  -Wall -I. -I$(SRCPATH) --sysroot=/Users/Project/devtools/android-sdk-macosx/android-ndk-r16b/platforms/android-16/arch-arm -march=armv5te -msoft-float -D__ANDROID__ -D__ARM_ARCH_5TE__ -D__ARM_ARCH_5TEJ__ -std=gnu99 -D_GNU_SOURCE -fPIC -fomit-frame-pointer -fno-tree-vectorize     --sysroot=/Users/Project/devtools/android-sdk-macosx/android-ndk-r16b/platforms/android-16/arch-arm -nostdlib -lm -s -o conftest
    
conftest.c:1:19: fatal error: stdio.h: No such file or directory
    
 #include 
    
                   ^
    
compilation terminated.
    
--------------------------------------------------
    
Failed program was:
    
--------------------------------------------------
    
#include 
    
int main (void) { _fseeki64(stdin,0,0); return 0; }
    
--------------------------------------------------
    
checking for -Wshadow... yes
    
checking for -Wmaybe-uninitialized... yes
    

    
platform:      ARM
    
byte order:    little-endian
    
system:        LINUX
    
cli:           no
    
libx264:       internal
    
shared:        no
    
static:        yes
    
asm:           no
    
interlaced:    yes
    
avs:           no
    
lavf:          no
    
ffms:          no
    
mp4:           no
    
gpl:           yes
    
thread:        no
    
opencl:        no
    
filters:       crop select_every
    
lto:           no
    
debug:         no
    
gprof:         no
    
strip:         yes
    
PIC:           yes
    
bit depth:     all
    
chroma format: all

  • Unable to integrate ffmpeg as a native dependency for an Android NDK project

    28 février 2019, par mmark

    I have an Android NDK project which consists entirely of C/C++ code, and it basically processes images without using any external libraries.

    I’m using Android Studio + Gradle NDK Experimental plugin (0.7.0-alpha1).

    Now, I need to integrate ffmpeg as a native library to use it from the C/C++ code in order to decode a H.264 video frame.

    These are the questions I’ve found here regarding this issue :

    Android - Integrating ffmpeg and android-ndk-r9c

    Android NDK w/ ffmpeg library - error running project

    Using FFmpeg native libraries with Android-NDK

    Can not build with prebuilt static libraries using gradle-experimental

    Here is my build.gradle file :

    apply plugin: 'com.android.model.application'
    

    
def ffmpeg_path = file(project(':ffmpeg').projectDir).absolutePath + "/ffmpeg-android"
    

    
model {
    

    
    repositories {
    
        libs(PrebuiltLibraries) {
    
            libavcodec {
    
                headers.srcDir "${ffmpeg_path}/include"
    
                binaries.withType(StaticLibraryBinary) {
    
                    staticLibraryFile = file("${ffmpeg_path}/${targetPlatform.getName()}/lib/libavcodec.a")
    
                }
    
            }
    
            libavutil {
    
                headers.srcDir "${ffmpeg_path}/include"
    
                binaries.withType(StaticLibraryBinary) {
    
                    staticLibraryFile = file("${ffmpeg_path}/${targetPlatform.getName()}/lib/libavutil.a")
    
                }
    
            }
    
            libswresample {
    
                headers.srcDir "${ffmpeg_path}/include"
    
                binaries.withType(StaticLibraryBinary) {
    
                    staticLibraryFile = file("${ffmpeg_path}/${targetPlatform.getName()}/lib/libswresample.a")
    
                }
    
            }
    
            libswscale {
    
                headers.srcDir "${ffmpeg_path}/include"
    
                binaries.withType(StaticLibraryBinary) {
    
                    staticLibraryFile = file("${ffmpeg_path}/${targetPlatform.getName()}/lib/libswscale.a")
    
                }
    
            }
    
            libavformat {
    
                headers.srcDir "${ffmpeg_path}/include"
    
                binaries.withType(StaticLibraryBinary) {
    
                    staticLibraryFile = file("${ffmpeg_path}/${targetPlatform.getName()}/lib/libavformat.a")
    
                }
    
            }
    
            libavdevice {
    
                headers.srcDir "${ffmpeg_path}/include"
    
                binaries.withType(StaticLibraryBinary) {
    
                    staticLibraryFile = file("${ffmpeg_path}/${targetPlatform.getName()}/lib/libavdevice.a")
    
                }
    
            }
    
            libavfilter {
    
                headers.srcDir "${ffmpeg_path}/include"
    
                binaries.withType(StaticLibraryBinary) {
    
                    staticLibraryFile = file("${ffmpeg_path}/${targetPlatform.getName()}/lib/libavfilter.a")
    
                }
    
            }
    
            libpostproc {
    
                headers.srcDir "${ffmpeg_path}/include"
    
                binaries.withType(StaticLibraryBinary) {
    
                    staticLibraryFile = file("${ffmpeg_path}/${targetPlatform.getName()}/lib/libpostproc.a")
    
                }
    
            }
    
        }
    
    }
    

    
    android {
    
        compileSdkVersion = 23
    
        buildToolsVersion = "23.0.2"
    

    
        defaultConfig.with {
    
            applicationId = "com.example.hellojni"
    
            minSdkVersion.apiLevel = 4
    
            targetSdkVersion.apiLevel = 23
    
        }
    
    }
    

    
    /*
    
     * native build settings
    
     */
    
    android.ndk {
    
        moduleName = "hello-jni"
    
        platformVersion = 9 //same as minSdkVersion.apiLevel for better compatibility
    
        stl    = "c++_static"
    
        abiFilters.addAll(["armeabi", "armeabi-v7a", "x86"]) //filtering ABIs on the ones Google Play Games library is compatible with.
    
    }
    
    android.buildTypes {
    
        release {
    
            minifyEnabled = false
    
            proguardFiles.add(file('proguard-rules.txt'))
    
        }
    
    }
    

    
    android.sources {
    
        main {
    
            jni {
    
                dependencies {
    
                    library "libavcodec" linkage "static"
    
                    library "libavutil" linkage "static"
    
                    library "libswresample" linkage "static"
    
                    library "libswscale" linkage "static"
    
                    library "libavformat" linkage "static"
    
                    library "libavdevice" linkage "static"
    
                    library "libavfilter" linkage "static"
    
                    library "libpostproc" linkage "static"
    
                }
    
            }
    
        }
    
    }
    

    
}

    I based on this sample from Google which integrates an external native library.

    This is the ffmpeg project I compiled before importing it into mine :
    https://github.com/WritingMinds/ffmpeg-android

    I’ve added all the .a and .h files and I’m able to import the headers in my C/C++ code, but when I try to compile it I get the following error :

    /Users/marcos/Documents/Android/fdecoder/ffmpeg/ffmpeg-android/armeabi-v7a/lib/libavformat.a(utils.o):utils.c:function try_decode_frame: error: undefined reference to 'avpriv_h264_has_num_reorder_frames'
    
/Users/marcos/Documents/Android/fdecoder/ffmpeg/ffmpeg-android/armeabi-v7a/lib/libavformat.a(utils.o):utils.c:function compute_pkt_fields: error: undefined reference to 'avpriv_h264_has_num_reorder_frames'
    
/Users/marcos/Documents/Android/fdecoder/ffmpeg/ffmpeg-android/armeabi-v7a/lib/libavformat.a(utils.o):utils.c:function parse_packet: error: undefined reference to 'av_parser_parse2'
    
/Users/marcos/Documents/Android/fdecoder/ffmpeg/ffmpeg-android/armeabi-v7a/lib/libavformat.a(utils.o):utils.c:function parse_packet: error: undefined reference to 'av_parser_close'
    
/Users/marcos/Documents/Android/fdecoder/ffmpeg/ffmpeg-android/armeabi-v7a/lib/libavformat.a(utils.o):utils.c:function read_frame_internal: error: undefined reference to 'av_parser_init'
    
/Users/marcos/Documents/Android/fdecoder/ffmpeg/ffmpeg-android/armeabi-v7a/lib/libavformat.a(utils.o):utils.c:function avformat_find_stream_info: error: undefined reference to 'av_parser_init'
    
/Users/marcos/Documents/Android/fdecoder/ffmpeg/ffmpeg-android/armeabi-v7a/lib/libavformat.a(utils.o):utils.c:function avformat_find_stream_info: error: undefined reference to 'avcodec_pix_fmt_to_codec_tag'
    
/Users/marcos/Documents/Android/fdecoder/ffmpeg/ffmpeg-android/armeabi-v7a/lib/libavformat.a(utils.o):utils.c:function avformat_find_stream_info: error: undefined reference to 'avpriv_get_raw_pix_fmt_tags'
    
/Users/marcos/Documents/Android/fdecoder/ffmpeg/ffmpeg-android/armeabi-v7a/lib/libavformat.a(utils.o):utils.c:function ff_stream_add_bitstream_filter: error: undefined reference to 'av_bitstream_filter_init'
    
/Users/marcos/Documents/Android/fdecoder/ffmpeg/ffmpeg-android/armeabi-v7a/lib/libavformat.a(utils.o):utils.c:function ff_stream_add_bitstream_filter: error: undefined reference to 'av_bitstream_filter_close'
    
/Users/marcos/Documents/Android/fdecoder/ffmpeg/ffmpeg-android/armeabi-v7a/lib/libavformat.a(utils.o):utils.c:function av_apply_bitstream_filters: error: undefined reference to 'av_bitstream_filter_filter'
    
/Users/marcos/Documents/Android/fdecoder/ffmpeg/ffmpeg-android/armeabi-v7a/lib/libavformat.a(aadec.o):aadec.c:function aa_read_packet: error: undefined reference to 'av_tea_init'
    
/Users/marcos/Documents/Android/fdecoder/ffmpeg/ffmpeg-android/armeabi-v7a/lib/libavformat.a(aadec.o):aadec.c:function aa_read_packet: error: undefined reference to 'av_tea_crypt'
    
/Users/marcos/Documents/Android/fdecoder/ffmpeg/ffmpeg-android/armeabi-v7a/lib/libavformat.a(aadec.o):aadec.c:function aa_read_header: error: undefined reference to 'av_tea_alloc'
    
/Users/marcos/Documents/Android/fdecoder/ffmpeg/ffmpeg-android/armeabi-v7a/lib/libavformat.a(aadec.o):aadec.c:function aa_read_header: error: undefined reference to 'av_tea_init'
    
/Users/marcos/Documents/Android/fdecoder/ffmpeg/ffmpeg-android/armeabi-v7a/lib/libavformat.a(aadec.o):aadec.c:function aa_read_header: error: undefined reference to 'av_tea_crypt'
    
/Users/marcos/Documents/Android/fdecoder/ffmpeg/ffmpeg-android/armeabi-v7a/lib/libavformat.a(ac3dec.o):ac3dec.c:function ac3_eac3_probe.isra.0: error: undefined reference to 'avpriv_ac3_parse_header'
    
/Users/marcos/Documents/Android/fdecoder/ffmpeg/ffmpeg-android/armeabi-v7a/lib/libavformat.a(adtsenc.o):adtsenc.c:function adts_write_header: error: undefined reference to 'avpriv_mpeg4audio_get_config'
    
/Users/marcos/Documents/Android/fdecoder/ffmpeg/ffmpeg-android/armeabi-v7a/lib/libavformat.a(adtsenc.o):adtsenc.c:function adts_write_header: error: undefined reference to 'avpriv_copy_pce_data'
    
/Users/marcos/Documents/Android/fdecoder/ffmpeg/ffmpeg-android/armeabi-v7a/lib/libavformat.a(asfcrypt.o):asfcrypt.c:function ff_asfcrypt_dec: error: undefined reference to 'av_rc4_alloc'
    
/Users/marcos/Documents/Android/fdecoder/ffmpeg/ffmpeg-android/armeabi-v7a/lib/libavformat.a(asfcrypt.o):asfcrypt.c:function ff_asfcrypt_dec: error: undefined reference to 'av_rc4_init'
    
/Users/marcos/Documents/Android/fdecoder/ffmpeg/ffmpeg-android/armeabi-v7a/lib/libavformat.a(asfcrypt.o):asfcrypt.c:function ff_asfcrypt_dec: error: undefined reference to 'av_rc4_crypt'
    
/Users/marcos/Documents/Android/fdecoder/ffmpeg/ffmpeg-android/armeabi-v7a/lib/libavformat.a(asfcrypt.o):asfcrypt.c:function ff_asfcrypt_dec: error: undefined reference to 'av_rc4_init'
    
/Users/marcos/Documents/Android/fdecoder/ffmpeg/ffmpeg-android/armeabi-v7a/lib/libavformat.a(asfcrypt.o):asfcrypt.c:function ff_asfcrypt_dec: error: undefined reference to 'av_rc4_crypt'
    
/Users/marcos/Documents/Android/fdecoder/ffmpeg/ffmpeg-android/armeabi-v7a/lib/libavformat.a(matroska.o):matroska.c:function ff_mkv_stereo3d_conv: error: undefined reference to 'av_stereo3d_alloc'
    
/Users/marcos/Documents/Android/fdecoder/ffmpeg/ffmpeg-android/armeabi-v7a/lib/libavformat.a(nut.o):nut.c:function ff_nut_add_sp: error: undefined reference to 'av_tree_node_alloc'
    
/Users/marcos/Documents/Android/fdecoder/ffmpeg/ffmpeg-android/armeabi-v7a/lib/libavformat.a(nut.o):nut.c:function ff_nut_add_sp: error: undefined reference to 'av_tree_insert'
    
/Users/marcos/Documents/Android/fdecoder/ffmpeg/ffmpeg-android/armeabi-v7a/lib/libavformat.a(nut.o):nut.c:function ff_nut_free_sp: error: undefined reference to 'av_tree_enumerate'
    
/Users/marcos/Documents/Android/fdecoder/ffmpeg/ffmpeg-android/armeabi-v7a/lib/libavformat.a(nut.o):nut.c:function ff_nut_free_sp: error: undefined reference to 'av_tree_destroy'
    
Error:error: ld returned 1 exit status
    
Error:Execution failed for task ':app:linkHello-jniArmeabi-v7aDebugSharedLibrary'.
    
> A build operation failed.
    
      Linker failed while linking libhello-jni.so.
    
  See the complete log at: file:///Users/marcos/Documents/Android/fdecoder/app/build/tmp/linkHello-jniArmeabi-v7aDebugSharedLibrary/output.txt
    
Information:BUILD FAILED
    
Information:Total time: 14.993 secs
    
Information:2 errors
    
Information:0 warnings
    
Information:See complete output in console

    There’s obviously something I’m not importing properly, but can’t figure exactly what’s missing.

  • 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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