关于编译x264时出现的for Cortex-A8 erratum because it has no mapping symbols问题

linux下编译x264库时提示警告信息：cannot scan executable section 1 of libx264.a(dct-a.o) for Cortex-A8 erratum because it has no mapping symbols

要去掉该警告信息，将Makefile中含有 (STRIP) -x 的地方语句

-@ $(if $(STRIP), $(STRIP) -x $@) #delete local/anonymous symbols, so they don't show up in oprofile, except the mapping symbols

替换为

-@ $(if $(STRIP), $(STRIP) -x -K \$$a -K \$$t -K \$$d $@) #delete local/anonymous symbols, so they don't show up in oprofile, except the mapping symbols

即可。

注：红色部分是增加的内容，Makefile中总共有2处需要修改。

附上NDK编译脚本：

#!/bin/bash
export NDK=/opt/android-ndk-r10e
export PREBUILT=$NDK/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64
export CC=$PREBUILT/bin/arm-linux-androideabi-gcc
export LD=$PREBUILT/bin/arm-linux-androideabi-ld
export AS=$PREBUILT/bin/arm-linux-androideabi-gcc
export AR=$PREBUILT/bin/arm-linux-androideabi-ar
export RANLIB=$PREBUILT/bin/arm-linux-androideabi-ranlib
export STRIP=$PREBUILT/bin/arm-linux-androideabi-strip
export PLATFORM=$NDK/platforms/android-8/arch-arm 
export PREFIX=./build_android
export STRIP=$PREBUILT/bin/arm-linux-androideabi-strip

./configure --prefix=$PREFIX \
    --enable-static \
    --enable-pic \
    --enable-strip \
    --disable-cli \
    --extra-cflags="-fPIC -DANDROID -fpic -mthumb-interwork -ffunction-sections -funwind-tables -fstack-protector -fno-short-enums -march=armv7-a -mtune=cortex-a9 -mfloat-abi=softfp -mfpu=neon -D__ARM_ARCH_7__ -D__ARM_ARCH_7A__  -Wno-psabi -msoft-float -mthumb -Os -fomit-frame-pointer -fno-strict-aliasing -finline-limit=64 -DANDROID  -Wa,--noexecstack -MMD -MP " \
    --extra-ldflags="-fuse-ld=bfd -Wl,--fix-cortex-a8" \
    --host=arm-linux \
    --cross-prefix=$PREBUILT/bin/arm-linux-androideabi- \
    --sysroot=$PLATFORM