[Android/IOS] Building with debug option fails

[tanersener]

Android arm64-v8a builds fail during linking with this error:

LD	libavutil/libavutil.so.56
libavutil/../compat/strtod.o: file not recognized: File format not recognized
clang70: error: linker command failed with exit code 1 (use -v to see invocation)
ffbuild/library.mak:102: recipe for target 'libavutil/libavutil.so.56' failed
make: *** [libavutil/libavutil.so.56] Error 1
make: *** Waiting for unfinished jobs....

other Android architectures fail again during linking with this error:

LD	libavutil/libavutil.so.56
/files/android-sdk/android-ndk-r18b/toolchains/mobile-ffmpeg-api-24-arm/bin/../lib/gcc/arm-linux-androideabi/4.9.x/../../../../arm-linux-androideabi/bin/ld: error: libavutil/../compat/strtod.o:1:3: invalid character
/files/android-sdk/android-ndk-r18b/toolchains/mobile-ffmpeg-api-24-arm/bin/../lib/gcc/arm-linux-androideabi/4.9.x/../../../../arm-linux-androideabi/bin/ld: error: libavutil/../compat/strtod.o:1:3: syntax error, unexpected $end
/files/android-sdk/android-ndk-r18b/toolchains/mobile-ffmpeg-api-24-arm/bin/../lib/gcc/arm-linux-androideabi/4.9.x/../../../../arm-linux-androideabi/bin/ld: error: libavutil/../compat/strtod.o: not an object or archive

IOS architectures fail with this compilation error.

CC	libavcodec/dvdata.o
libavcodec/dvbsubdec.c:1430:9: error: 'system' is unavailable: not available on iOS
    if (system(command) != 0) {
        ^
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS12.1.sdk/usr/include/stdlib.h:190:6: note: 'system' has been explicitly marked unavailable here
int      system(const char *) __DARWIN_ALIAS_C(system);
         ^
libavcodec/dvbsubdec.c:1436:9: error: 'system' is unavailable: not available on iOS
    if (system(command) != 0) {
        ^
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS12.1.sdk/usr/include/stdlib.h:190:6: note: 'system' has been explicitly marked unavailable here
int      system(const char *) __DARWIN_ALIAS_C(system);
         ^
2 errors generated.
make: *** [libavcodec/dvbsubdec.o] Error 1
make: *** Waiting for unfinished jobs....

[tanersener]

On Android, link time optimizations cause this error. They must be disabled on debug.

On IOS, -DDEBUG in CFLAGS cause this. It must be removed.

[tanersener]

Fixed in development, issue will be closed when development is merged to master.