fdk_aac版本：0.1.6，ndk版本：15，shell脚本如下：
NDK=/Users/admin/Desktop/xxx/e/ndks/android-ndk-r15c
SYSROOT=$NDK/platforms/android-14/arch-arm
TOOLCHAIN=$NDK/toolchains/arm-linux-androideabi-4.9/prebuilt/darwin-x86_64
export PATH=$PATH:$TOOLCHAIN/bin:$SYSROOT/usr/include:
export LDFLAGS="-L$SYSROOT/usr/lib -L$TOOLCHAIN/arm-linux-androideabi/lib -march=armv7-a"
export CFLAGS="-I$SYSROOT/usr/include -march=armv7-a -mfloat-abi=softfp -mfpu=vfp -ffast-math -O2"
export CPPFLAGS="$CFLAGS"
export CFLAGS="$CFLAGS"
export CXXFLAGS="$CFLAGS"
export LDFLAGS="$LDFLAGS"
export AS=$TOOLCHAIN/bin/arm-linux-androideabi-as
export LD=$TOOLCHAIN/bin/arm-linux-androideabi-ld
export CXX="$TOOLCHAIN/bin/arm-linux-androideabi-g++ --sysroot=${SYSROOT}"
export CC="$TOOLCHAIN/bin/arm-linux-androideabi-gcc --sysroot=${SYSROOT} -march=armv7-a"
export NM=$TOOLCHAIN/bin/arm-linux-androideabi-nm
export STRIP=$TOOLCHAIN/bin/arm-linux-androideabi-strip
export RANLIB=$TOOLCHAIN/bin/arm-linux-androideabi-ranlib
export AR=$TOOLCHAIN/bin/arm-linux-androideabi-ar
PREFIX=$(pwd)/armv7a
./configure --host=armv7a \
--disable-shared \
--enable-static \
--prefix=$PREFIX
make clean
make -j8
sudo make install
