为什么CMake拒绝使用非默认编译器？ [英] Why does CMake refuse to use a non-default compiler?

问题描述

我想检查我的C ++项目是否在旧版本的GCC上编译。因此，我已经安装了旧版本，并希望CMake使用它来编译我的项目。

I want to check whether my C++ project compiles on an older version of GCC. For this reason I have installed the older version and want CMake to use it to compile my project.

CMake常见问题解答更改编译器告诉我这是正确的方法：

The CMake FAQ on changing the compiler tells me that this is the right way to do it:

CC=gcc-4.4 CXX=g++-4.4 cmake -G "Unix Makefiles" ..

这就是我键入的内容和CMake似乎运行良好：

So this is what I typed and CMake seems to run fine:

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：

However, looking at CMakeCache.txt now I find this:

//CXX compiler.
CMAKE_CXX_COMPILER:FILEPATH=/usr/bin/c++

显然CMake没有使用我指定的编译器。当我将此行更改为使用g ++-4.4并再次运行CMake时，它将创建一个无限循环：

Obviously CMake did not use the compiler I specified. When I change this line to use g++-4.4 and run CMake again it will create an endless loop:

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？

Why does CMake not use the compiler I specify and how can I fix this?

推荐答案

通过您提供的链接：

不能保证此方法适用于所有生成器

This method is not guaranteed to work for all generators

使用第二种方法：

cmake -G您的生成器 -D CMAKE_C_COMPILER = gcc-4.4 -D CMAKE_CXX_COMPILER = g ++-4.4路径/到/您的/源

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：

1. 使用绝对路径


2. 不要忘记在构建目录中清理所有

1. use absolute path
2. do not forget to clean all in build directory

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