Cmake交叉编译标志 [英] Cmake cross compile flags

问题描述

  include（CMakeForceCompiler）
 set（CMAKE_CROSSCOMPILING TRUE） 
 set（CMAKE_SYSTEM_NAME Linux）
 set（CMAKE_SYSTEM_VERSION 1）
 set（CMAKE_SYSTEM_PROCESSORarmv7-a）
 set（CMAKE_CXX_FLAGS$ {CMAKE_CXX_FLAGS} -fPIC -Wno-psabi  - （CMAKE_C_FLAGS$ {CMAKE_C_FLAGS} -fPIC -Wno-psabi -fexceptions）
 set（CMAKE_C_COMPILER / home / stranger / linaro / android-toolchain-eabi / bin / arm） -linux-androideabi-gcc）
 set（CMAKE_CXX_COMPILER / home / stranger / linaro / android-toolchain-eabi / bin / arm-linux-androideabi-g ++）
 CMAKE_FORCE_C_COMPILER（$ {CMAKE_C_COMPILER}GNU ）
 CMAKE_FORCE_CXX_COMPILER（$ {CMAKE_CXX_COMPILER}GNU）
 set（CMAKE_FIND_ROOT_PATH home / stranger / linaro / android-toolchain -eabi / arm-linux-androideabi）
 include_directories（SYSTEM / home /陌生人/ android-ndk-r8 / platforms / android-14 / arch-arm / usr / include）
 include_directories（SYSTEM / home / stranger / android-nd k-r8 / sources / cxx-stl / gnu-libstdc ++ / include）
 include_directories（SYSTEM / home / stranger / android-ndk-r8 / sources / cxx-stl / gnu-libstdc ++ / libs / armeabi-v7a /包括）
  

我运行cmake：

  cmake -DBUILD_ANDROID = On -DCMAKE_TOOLCHAIN_FILE =<此toolchain.cmake的路径> -DCMAKE_BUILD_TYPE =发布<我的cmake项目的路径> 
  

但是在编译时，我有关于异常的错误，而不是工具链文件中定义的编译器标志： / p>

 错误：禁用异常处理，使用-fexceptions启用
  

据我了解我的CMAKE_C_FLAGS_RELEASE，CMAKE_CXX_FLAGS_RELEASE没有任何影响。为什么？

解决方案

问题解决了，我的错误。我使用 set（CMAKE_CXX_FLAGS< flags>）对 set（CMAKE_CXX_FLAGS$ {CMAKE_CXX_FLAGS}< flags>在主项目中，我很困惑，因为这个CMakeLists.txt适用于android-cmake和Google-NDK（而不是所有android-cmake工具链标志都被拒绝）。

I writing toolchain.cmake file for Linaro toolchain.

include(CMakeForceCompiler)
set(CMAKE_CROSSCOMPILING   TRUE)
set(CMAKE_SYSTEM_NAME Linux)
set(CMAKE_SYSTEM_VERSION 1)
set(CMAKE_SYSTEM_PROCESSOR "armv7-a")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fPIC -Wno-psabi -frtti -fexceptions" )
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fPIC -Wno-psabi -fexceptions" )
set(CMAKE_C_COMPILER /home/stranger/linaro/android-toolchain-eabi/bin/arm-linux-androideabi-gcc)
set(CMAKE_CXX_COMPILER /home/stranger/linaro/android-toolchain-eabi/bin/arm-linux-androideabi-g++)
CMAKE_FORCE_C_COMPILER("${CMAKE_C_COMPILER}" GNU)
CMAKE_FORCE_CXX_COMPILER("${CMAKE_CXX_COMPILER}" GNU)
set(CMAKE_FIND_ROOT_PATH  home/stranger/linaro/android-toolchain-eabi/arm-linux-androideabi)
include_directories( SYSTEM /home/stranger/android-ndk-r8/platforms/android-14/arch-arm/usr/include)
include_directories( SYSTEM /home/stranger/android-ndk-r8/sources/cxx-stl/gnu-libstdc++/include)
include_directories( SYSTEM /home/stranger/android-ndk-r8/sources/cxx-stl/gnu-libstdc++/libs/armeabi-v7a/include)

I run cmake:

cmake -DBUILD_ANDROID=On -DCMAKE_TOOLCHAIN_FILE=<path to this toolchain.cmake>  -DCMAKE_BUILD_TYPE=Release <path to my cmake project>

But at compile time, i had error about exceptions, instead of defined compiler flags in toolchain file:

error: exception handling disabled, use -fexceptions to enable

As far as I can understand my CMAKE_C_FLAGS_RELEASE, CMAKE_CXX_FLAGS_RELEASE has no effect. Why?

解决方案

Problem solved, my mistake. I use set(CMAKE_CXX_FLAGS "<flags>") against set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}<flags>" in main project. I was confused, because this CMakeLists.txt works correctly for android-cmake and Google-NDK (instead of all android-cmake toolchain flags was rejected).

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