为什么CMake拒绝使用非
我想检查我的C ++项目是否在旧版本的GCC上编译。 为此，我安装了旧版本，并希望CMake使用它来编译我的项目。
关于更改编译器的CMake常见问题解答告诉我，这是实现它的正确方法：
CC=gcc-4.4 CXX=g++-4.4 cmake -G "Unix Makefiles" ..
所以这就是我键入和CMake似乎运行良好：
chris@chris-machine:~/projects/myProject/build$ CC=gcc-4.4 CXX=g++-4.4 cmake -G "Unix Makefiles" .. -- Found PythonInterp: /usr/bin/python (found version "2.7.4") -- Looking for include file pthread.h -- Looking for include file pthread.h - found -- Looking for pthread_create -- Looking for pthread_create - not found -- Looking for pthread_create in pthreads -- Looking for pthread_create in pthreads - not found -- Looking for pthread_create in pthread -- Looking for pthread_create in pthread - found -- Found Threads: TRUE -- Configuring done -- Generating done -- Build files have been written to: /home/chris/projects/myProject/build
但是，现在看CMakeCache.txt，我发现：
//CXX compiler. CMAKE_CXX_COMPILER:FILEPATH=/usr/bin/c++
很明显，CMake没有使用我指定的编译器。 当我改变这一行以使用g ++ - 4.4并再次运行CMake时，它会创建一个无限循环：
chris@chris-machine:~/projects/myProject/build$ CC=gcc-4.4 CXX=g++-4.4 cmake -G "Unix Makefiles" .. -- Configuring done You have changed variables that require your cache to be deleted. Configure will be re-run and you may have to reset some variables. The following variables have changed: CMAKE_CXX_COMPILER= /usr/bin/g++-4.4 -- Found PythonInterp: /usr/bin/python (found version "2.7.4") -- Looking for include file pthread.h -- Looking for include file pthread.h - found -- Looking for pthread_create -- Looking for pthread_create - not found -- Looking for pthread_create in pthreads -- Looking for pthread_create in pthreads - not found -- Looking for pthread_create in pthread -- Looking for pthread_create in pthread - found -- Found Threads: TRUE -- Configuring done You have changed variables that require your cache to be deleted. Configure will be re-run and you may have to reset some variables. The following variables have changed: CMAKE_CXX_COMPILER= /usr/bin/g++-4.4 -- Found PythonInterp: /usr/bin/python (found version "2.7.4") // and so on...
为什么CMake不使用我指定的编译器，我该如何解决这个问题？
从你提供的链接：
这种方法不能保证适用于所有的发电机
使用第二种方法：
cmake -G“Your Generator”-D CMAKE_C_COMPILER = gcc-4.4 -D CMAKE_CXX_COMPILER = g ++ - 4.4 path / to / your / source
如果没有帮助：
我也遇到了这个确切的问题。 显然这是CMake中的一个“无法修复”的问题：https：//cmake.org/Bug/view.php？id = 14841
一种解决方法是在每次要重新生成构建目录时，删除构建目录的CMakeFiles目录中的CMakeCXXCompiler.cmake文件。
路径应该是： build_directory/CMakeFiles/CMAKE_VERSION/CMakeCXXCompiler.cmake 。 在Linux上，您可以通过cmake --version | cut -d ' ' -f 3 CMAKE_VERSION编程方式获得CMAKE_VERSION cmake --version | cut -d ' ' -f 3 。
一个简单的“修复”就是只要你预计你会遇到这个问题，就把该文件的删除添加到你的构建脚本中。
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