mac下使用NDK21 Clang编译x264

获取x264源码

从x264官网：https://www.videolan.org/developers/x264.html下载x264源码，

进入x264源码目录下执行 ./configure --help 查看编译选项说明

编译选项

Standard options:
  --prefix=PREFIX          install architecture-independent files in PREFIX
                           [/usr/local]
  --exec-prefix=EPREFIX    install architecture-dependent files in EPREFIX
                           [PREFIX]
  --bindir=DIR             install binaries in DIR [EPREFIX/bin]
  --libdir=DIR             install libs in DIR [EPREFIX/lib]
  --includedir=DIR         install includes in DIR [PREFIX/include]
  --extra-asflags=EASFLAGS add EASFLAGS to ASFLAGS
  --extra-cflags=ECFLAGS   add ECFLAGS to CFLAGS
  --extra-ldflags=ELDFLAGS add ELDFLAGS to LDFLAGS
  --extra-rcflags=ERCFLAGS add ERCFLAGS to RCFLAGS

Configuration options:
  --disable-cli            disable cli
  --system-libx264         use system libx264 instead of internal
  --enable-shared          build shared library
  --enable-static          build static library
  --disable-bashcompletion disable installation of bash-completion script
  --enable-bashcompletion  force installation of bash-completion script
  --bashcompletionsdir=DIR install bash-completion script in DIR [auto]
  --disable-opencl         disable OpenCL features
  --disable-gpl            disable GPL-only features
  --disable-thread         disable multithreaded encoding
  --disable-win32thread    disable win32threads (windows only)
  --disable-interlaced     disable interlaced encoding support
  --bit-depth=BIT_DEPTH    set output bit depth (8, 10, all) [all]
  --chroma-format=FORMAT   output chroma format (400, 420, 422, 444, all) [all]

Advanced options:
  --disable-asm            disable platform-specific assembly optimizations
  --enable-lto             enable link-time optimization
  --enable-debug           add -g
  --enable-gprof           add -pg
  --enable-strip           add -s
  --enable-pic             build position-independent code

Cross-compilation:
  --host=HOST              build programs to run on HOST
  --cross-prefix=PREFIX    use PREFIX for compilation tools
  --sysroot=SYSROOT        root of cross-build tree

External library support:
  --disable-avs            disable avisynth support
  --disable-swscale        disable swscale support
  --disable-lavf           disable libavformat support
  --disable-ffms           disable ffmpegsource support
  --disable-gpac           disable gpac support
  --disable-lsmash         disable lsmash support

x264编译脚本

以编译armeabi-v7a架构的x264为例, 使用安装Android studio 时as下载的NDK

#!/bin/bash

set -x 
 
export NDK=/Users/wancs/Library/Android/sdk/ndk/21.0.6113669
export TOOLCHAIN=$NDK/toolchains/llvm/prebuilt/**darwin-x86_64**
export API=21

function build
{
    
    
  ./configure \
    --prefix=$PREFIX \
    --disable-cli \
    --enable-static \
    --enable-pic \
    --host=$HOST \
    --cross-prefix=$CROSS_PREFIX \
    --sysroot=$NDK/toolchains/llvm/prebuilt/darwin-x86_64/sysroot \
 
	make clean
	make -j8
	make install
}
#armeabi-v7a
PREFIX=./armeabi-v7a
HOST=armv7a-linux-android
export TARGET=armv7a-linux-androideabi
export CC=$TOOLCHAIN/bin/$TARGET$API-clang
export CXX=$TOOLCHAIN/bin/$TARGET$API-clang++
export CROSS_PREFIX=$TOOLCHAIN/bin/arm-linux-androideabi-

build

如需要编译arm64-v8a架构版本，则修改以下变量：

#arm64-v8a
PREFIX=./android/arm64-v8a
HOST=aarch64-linux-android
export TARGET=aarch64-linux-android
export CC=$TOOLCHAIN/bin/$TARGET$API-clang
export CXX=$TOOLCHAIN/bin/$TARGET$API-clang++
CROSS_PREFIX=$TOOLCHAIN/bin/aarch64-linux-android-