爲什麼CMake拒絕使用非默認編譯器？

我想檢查我的C++項目是否在GCC的舊版本上編譯。爲此，我安裝了舊版本，並希望CMake使用它來編譯我的項目。爲什麼CMake拒絕使用非默認編譯器？

CMake的常見問題on changing the compiler告訴我，這是做正確的方式：

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

原來這就是我輸入和CMake的似乎運行正常：

[email protected]:~/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

然而，展望在CMakeCache.txt現在我發現這一點：

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

顯然CMake的沒有使用補償我指定了。當我改變這一行使用G ++ - 4.4和再次運行CMake的它會創建一個無限循環：

[email protected]:~/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...

爲什麼CMake的不使用我指定的編譯器，我怎麼能解決這個問題？

來源

2013-08-21 Chris

從鏈接您提供：

此方法不能保證對所有發電機

使用第二種方法工作：

的cmake -G 「你發生器」 - D CMAKE_C_COMPILER = gcc-4.4 -D CMAKE_CXX_COMPILER = g ++ - 4.4 path/to/your/source

如果沒有幫助：

使用絕對路徑
不要忘記清潔所有在build目錄

來源

2013-08-21 05:48:55

謝謝你，我永遠只是刪除了CMakeCache.txt文件。似乎還有其他地方存儲的值（可能是CMakeFiles目錄），阻止CMake正確更新編譯器。它現在適用於這兩種方法。 – Chris

爲什麼CMake拒絕使用非默認編譯器？

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