构建x264，错误：找不到signal.h

Question

使用构建脚本构建x264时：

#!/bin/bash
NDK=/Local/Android/sdk/android-ndk-r16b

PLATFORM=$NDK/platforms/android-26/arch-arm/
TOOLCHAIN=$NDK/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64
PREFIX=./android/arm

function build_one
{
 ./configure \
 --prefix=$PREFIX \
 --enable-static \
--enable-pic \
 --host=arm-linux \
 --cross-prefix=$TOOLCHAIN/bin/arm-linux-androideabi- \
 --sysroot=$PLATFORM

  make clean
  make
  make install
}

build_one

echo Android ARM builds finished

但我总是遇到错误：

x264.c:40:20: fatal error: signal.h: No such file or directory
#include <signal.h>
                ^

编译终止。 ：目标'x264.o'的配方失败 make：*** [x264.o]错误1

Answer 1

android-ndk-r16b的一个变化是The deprecated headers have been removed. Unified Headers are now simply "The Headers". For migration tips, see Unified Headers Migration Notes.

所以在android-ndk-r16b中不再存在signal.h。您可以使用较低版本的NDK，例如android-ndk-r15c。