How to add a custom external library?

[Kyant0]

I want to use libopenmpt, and I adapted the scripts, it gives me error: ERROR: libopenmpt >= 0.2.6557 not found using pkg-config.
But there is already a file created, and the version meets the requirement.

Here's my script:
libopenmpt.zip

[Javernaut]

Such a message usually is posted if any failure happens during the FFmpeg's checking of a given library. Most probably a compilation error happens: FFmpeg tries to compile a test program that uses the library, checking if it is actually available. You can find more details of what is actually happening in: ffmpeg-android-maker/sources/ffmpeg/actualDirectory/ffbuild/config.log, usually at the very end. This file is generated after FFmpeg's configure script execution (this is done by ffmpeg-android-maker's execution)

[Kyant0]

BEGIN /tmp/ffconf.1yQJTgAY/test.c
    1	#include <libmodplug/modplug.h>
    2	#include <stdint.h>
    3	long check_ModPlug_Load(void) { return (long) ModPlug_Load; }
    4	int main(void) { int ret = 0;
    5	 ret |= ((intptr_t)check_ModPlug_Load) & 0xFFFF;
    6	return ret; }
END /tmp/ffconf.1yQJTgAY/test.c
/home/kyant/android-ndk-r26c/toolchains/llvm/prebuilt/linux-x86_64/bin/armv7a-linux-androideabi26-clang --sysroot=/home/kyant/android-ndk-r26c/toolchains/llvm/prebuilt/linux-x86_64/sysroot -D_ISOC11_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -Dstrtod=avpriv_strtod -DPIC -O3 -fPIC -DMODPLUG_STATIC -I/home/kyant/FFMPEG/ffmpeg-android-maker-master/build/external/armeabi-v7a/include -std=c17 -fPIE -fomit-frame-pointer -fPIC -marm -I/home/kyant/FFMPEG/ffmpeg-android-maker-master/build/external/armeabi-v7a/include -L/home/kyant/FFMPEG/ffmpeg-android-maker-master/build/external/armeabi-v7a/lib -c -o /tmp/ffconf.1yQJTgAY/test.o /tmp/ffconf.1yQJTgAY/test.c
clang-17: warning: argument unused during compilation: '-L/home/kyant/FFMPEG/ffmpeg-android-maker-master/build/external/armeabi-v7a/lib' [-Wunused-command-line-argument]
/home/kyant/android-ndk-r26c/toolchains/llvm/prebuilt/linux-x86_64/bin/armv7a-linux-androideabi26-clang -s -L/home/kyant/FFMPEG/ffmpeg-android-maker-master/build/external/armeabi-v7a/lib -lstdc++ -lm --sysroot=/home/kyant/android-ndk-r26c/toolchains/llvm/prebuilt/linux-x86_64/sysroot -Wl,--as-needed -Wl,-z,noexecstack -fPIE -pie -I/home/kyant/FFMPEG/ffmpeg-android-maker-master/build/external/armeabi-v7a/include -L/home/kyant/FFMPEG/ffmpeg-android-maker-master/build/external/armeabi-v7a/lib -o /tmp/ffconf.1yQJTgAY/test /tmp/ffconf.1yQJTgAY/test.o -lmodplug -lstdc++ -lm
ld.lld: error: /home/kyant/FFMPEG/ffmpeg-android-maker-master/build/external/armeabi-v7a/lib/libmodplug.so is incompatible with armelf_linux_eabi
clang-17: error: linker command failed with exit code 1 (use -v to see invocation)
ERROR: libmodplug not found using pkg-config

[Kyant0]

I tried a different library called libmodplug, it also gives me that.
It's strange to link to libmodplug.so while I am building a static lib. When I build libmodplug to a shared lib it still doesn't work. Here is my part of config.

./configure
--prefix=${BUILD_DIR_FFMPEG}/${ANDROID_ABI}
--enable-cross-compile
--target-os=android
--arch=${TARGET_TRIPLE_MACHINE_ARCH}
--sysroot=${SYSROOT_PATH}
--cc=${FAM_CC}
--cxx=${FAM_CXX}
--ld=${FAM_LD}
--ar=${FAM_AR}
--as=${FAM_CC}
--nm=${FAM_NM}
--ranlib=${FAM_RANLIB}
--strip=${FAM_STRIP}
--extra-cflags="-O3 -fPIC -DMODPLUG_STATIC $DEP_CFLAGS"
--extra-ldflags="-s $DEP_LD_FLAGS"
--pkgconfigdir=${PKG_CONFIG_LIBDIR}
--pkg-config=$(which pkg-config)
--pkg-config-flags="--static"
--disable-static
--enable-shared \

[Kyant0]

I really have no idea about it. I think it's because of the misuse of NDK toolchain. But it's indeed the corresponding architecture.

[Javernaut]

What exact library are you trying to integrate? It's just you mentioned 2 already.

It would also be helpful if you could provide a fork repo with a branch with all your changes, so there is no need to manually paste your code and add the missing parts (like the argument parsing).

Probably, I'll have some time for this issue this week, though I'm focussed on a different thing now.

[Kyant0]

https://github.com/Konstanty/libmodplug/tree/master

build.sh:

#!/usr/bin/env bash

autoreconf -i ${SCRIPTS_DIR}/../sources/libmodplug/libmodplug-master

${SCRIPTS_DIR}/../sources/libmodplug/libmodplug-master/configure \
    --prefix=${INSTALL_DIR} \
    --host=${TARGET} \
    --with-sysroot=${SYSROOT_PATH} \
    --enable-shared \
    --disable-static \
    --with-pic \
    CC=${FAM_CC} \
    AR=${FAM_AR} \
    RANLIB=${FAM_RANLIB} \
    CFLAGS="${CFLAGS} -DBUILD_SHARED_LIBS" \
    CMAKEFLAGS="-DANDROID_ABI=arm64-v8a" \
    ${ADDITIONAL_FLAGS} || exit 1

export FFMPEG_EXTRA_LD_FLAGS="${FFMPEG_EXTRA_LD_FLAGS} -lm"

${MAKE_EXECUTABLE} clean
${MAKE_EXECUTABLE} -j${HOST_NPROC}
${MAKE_EXECUTABLE} install

Error:
ld.lld: error: /home/kyant/FFMPEG/ffmpeg-android-maker-master/build/external/arm64-v8a/lib/libmodplug.so is incompatible with aarch64linux

[Kyant0]

It's x86-64, but when I compile it by using `./ffmpeg-android-maker.sh -abis=arm64-v8a -android=26 --source-git-branch=release/7.0 --enable-libmodplug`, it shows something about arm64