编译的问题头疼了我两个星期，今天终于有了结果，总结下来希望帮助更多人
1.编译脚本
#!/usr/bin/env bash
# 当前系统
export HOST_TAG=darwin-x86_64
# 支持的 Android CUP 架构
# export ARCH=aarch64
# export CPU=armv8-a
export ARCH=armv7a
export CPU=armv7-a
# 支持的 Android 最低系统版本
export MIN=21
export ANDROID_NDK_PLATFORM=android-21
export PREFIX=$(pwd)/android/$CPU
# NDK 根目录
export NDK=/Users/xusu/Library/Android/sdk/ndk/21.1.6352462
export MIN_PLATFORM=$NDK/platforms/android-$MIN
export SYSROOT=$NDK/sysroot
export TOOLCHAIN=$NDK/toolchains/llvm/prebuilt/$HOST_TAG
export AR=$TOOLCHAIN/bin/arm-linux-androideabi-ar
export AS=$TOOLCHAIN/bin/arm-linux-androideabi-as
export CC=$TOOLCHAIN/bin/$ARCH-linux-androideabi$MIN-clang
export CXX=$TOOLCHAIN/bin/$ARCH-linux-androideabi$MIN-clang++
export LD=$TOOLCHAIN/bin/arm-linux-androideabi-ld
export NM=$TOOLCHAIN/bin/arm-linux-androideabi-nm
export RANLIB=$TOOLCHAIN/bin/arm-linux-androideabi-ranlib
export STRIP=$TOOLCHAIN/bin/arm-linux-androideabi-strip
FF_EXTRA_CFLAGS=""
# FF_CFLAGS="-O3 -Wall -pipe -ffast-math -fstrict-aliasing -Werror=strict-aliasing -Wno-psabi -Wa,--noexecstack -DANDROID "
# FF_CFLAGS="-DANDROID -I$SYSROOT/usr/include"
# FF_LDFLAGS=" -shared -rpath-link=$MIN_PLATFORM/arch-arm64/usr/lib -L$MIN_PLATFORM/arch-arm64/usr/lib -nostdlib -fPIC -shared -pie -p -shared"
# OPTIMIZE_CFLAGS="-I$NDK/sysroot/usr/include -mfloat-abi=softfp -mfpu=vfp -marm -march=$CPU -DANDROID_PLATFORM=android-21"
OPTIMIZE_CFLAGS="-DANDROID -I$NDK/sysroot/usr/include/arm-linux-androideabi/"
# ADDI_LDFLAGS="-shared -rpath-link=$SYSROOT/usr/lib/aarch64-linux-android -L$SYSROOT/usr/lib/aarch64-linux-android -fuse-ld=bfd"
# ADDI_LDFLAGS="-Wl,-rpath-link=$MIN_PLATFORM/arch-arm/usr/lib -Wl,-rpath-link=$TOOLCHAIN/lib/gcc/arm-linux-androideabi/4.9.x/armv7-a -L$MIN_PLATFORM/arch-arm/usr/lib -L$TOOLCHAIN/lib/gcc/arm-linux-androideabi/4.9.x/armv7-a"
ADDI_LDFLAGS="-Wl,-rpath-link=$MIN_PLATFORM/arch-arm/usr/lib -L$MIN_PLATFORM/arch-arm/usr/lib -nostdlib"
sed -i "" "s/SLIBNAME_WITH_MAJOR='\$(SLIBNAME).\$(LIBMAJOR)'/SLIBNAME_WITH_MAJOR='\$(SLIBPREF)\$(FULLNAME)-\$(LIBMAJOR)\$(SLIBSUF)'/" configure
sed -i "" "s/LIB_INSTALL_EXTRA_CMD='\$\$(RANLIB) \"\$(LIBDIR)\\/\$(LIBNAME)\"'/LIB_INSTALL_EXTRA_CMD='\$\$(RANLIB) \"\$(LIBDIR)\\/\$(LIBNAME)\"'/" configure
sed -i "" "s/SLIB_INSTALL_NAME='\$(SLIBNAME_WITH_VERSION)'/SLIB_INSTALL_NAME='\$(SLIBNAME_WITH_MAJOR)'/" configure
sed -i "" "s/SLIB_INSTALL_LINKS='\$(SLIBNAME_WITH_MAJOR) \$(SLIBNAME)'/SLIB_INSTALL_LINKS='\$(SLIBNAME)'/" configure
# sed -i "" "s/SHFLAGS='-shared -Wl,-soname,\$(SLIBNAME)'/SHFLAGS='-shared -soname \$(SLIBNAME)'/" configure
# sed -i "" "s/-Wl//g" configure
# --sysroot=$SYSROOT \
# --ld=$LD \
./configure --host=arm-linux \
--prefix=$PREFIX \
--enable-cross-compile \
--disable-asm \
--disable-ffprobe \
--disable-ffplay \
--disable-ffmpeg \
--disable-debug \
--disable-symver \
--disable-stripping \
--disable-shared \
--disable-frontend \
--enable-static \
# --extra-cflags="$FF_EXTRA_CFLAGS $FF_CFLAGS" \
# --extra-ldflags="$FF_LDFLAGS"
sed -i "" "s/#define HAVE_TRUNC 0/#define HAVE_TRUNC 1/" config.h
sed -i "" "s/#define HAVE_TRUNCF 0/#define HAVE_TRUNCF 1/" config.h
sed -i "" "s/#define HAVE_RINT 0/#define HAVE_RINT 1/" config.h
sed -i "" "s/#define HAVE_LRINT 0/#define HAVE_LRINT 1/" config.h
sed -i "" "s/#define HAVE_LRINTF 0/#define HAVE_LRINTF 1/" config.h
sed -i "" "s/#define HAVE_ROUND 0/#define HAVE_ROUND 1/" config.h
sed -i "" "s/#define HAVE_ROUNDF 0/#define HAVE_ROUNDF 1/" config.h
sed -i "" "s/#define HAVE_CBRT 0/#define HAVE_CBRT 1/" config.h
sed -i "" "s/#define HAVE_CBRTF 0/#define HAVE_CBRTF 1/" config.h
sed -i "" "s/#define HAVE_COPYSIGN 0/#define HAVE_COPYSIGN 1/" config.h
sed -i "" "s/#define HAVE_ERF 0/#define HAVE_ERF 1/" config.h
sed -i "" "s/#define HAVE_HYPOT 0/#define HAVE_HYPOT 1/" config.h
sed -i "" "s/#define HAVE_ISNAN 0/#define HAVE_ISNAN 1/" config.h
sed -i "" "s/#define HAVE_ISFINITE 0/#define HAVE_ISFINITE 1/" config.h
sed -i "" "s/#define HAVE_INET_ATON 0/#define HAVE_INET_ATON 1/" config.h
sed -i "" "s/#define getenv(x) NULL/\\/\\/ #define getenv(x) NULL/" config.h
make -j 4
make install
2.编写Cmakelists
Android studio 3.5 使用cmake编译Lame3.100库so 🚩传送门，顺便谢谢NN955同学，他的文章对我帮助很大。
💪 内容会根据评论实时更新，你的疑问很重要。
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