[Tools] [cmake] 调试笔记 --- 64位平台下的cmake配置

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背景：

64位平台需要使用armv8版本编译so。

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调试：

从armv7版本配置上修改CMAKE_ANDROID_ARCH_ABI
armeabi-v7a为arm64-v8a

报如下错误：

Make Error at /opt/cmake-3.8.1-Linux-x86_64/share/cmake-3.8/Modules/Platform/Android-Determine.cmake:287 (message):
  Android: CMAKE_ANDROID_ARM_NEON is set but is valid only for 'armeabi-v7a'
  architecture.
Call Stack (most recent call first):
  /opt/cmake-3.8.1-Linux-x86_64/share/cmake-3.8/Modules/CMakeDetermineSystem.cmake:124 (include)
  CMakeLists.txt:3 (project)


CMake Error: CMAKE_C_COMPILER not set, after EnableLanguage
CMake Error: CMAKE_CXX_COMPILER not set, after EnableLanguage
-- Configuring incomplete, errors occurred!
make: *** No targets specified and no makefile found.  Stop.

CMAKE_ANDROID_ARM_NEON是配合armv7做的设置，见官网说明：

移除CMAKE_ANDROID_ARM_NEON设置，编译成功。

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最终配置：

android.toolchain.camke如下：

set(CMAKE_SYSTEM_NAME Android)
set(CMAKE_SYSTEM_VERSION 23)
set(CMAKE_ANDROID_NDK_TOOLCHAIN_VERSION clang)
set(CMAKE_ANDROID_ARCH_ABI arm64-v8a)
#set(CMAKE_ANDROID_ARM_NEON ON)
set(CMAKE_ANDROID_NDK /opt/android-ndk-r14b)
set(CMAKE_ANDROID_STL_TYPE gnustl_static)

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参考：

CMake