在一台新搭建的服务器上执行cmake的时候,报了如下错误:
$ cmake ./
-- The C compiler identification is unknown
-- The CXX compiler identification is GNU 4.4.7
-- Check for working C compiler: /usr/bin/cc
-- Check for working C compiler: /usr/bin/cc -- broken
CMake Error at /usr/share/cmake/Modules/CMakeTestCCompiler.cmake:61 (message):
The C compiler "/usr/bin/cc" is not able to compile a simple test program.
It fails with the following output:
...
查看下gcc与g++的版本:
$ gcc --version
gcc (GCC) 5.1.0
Copyright (C) 2015 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
$ g++ --version
g++ (GCC) 5.1.0
Copyright (C) 2015 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
发现都是5.1.0,那为何会有这行“The CXX compiler identification is GNU 4.4.7”报错呢?
查看当前目录下的CMakeCache.txt
发现如下两行配置:
//CXX compiler.
CMAKE_CXX_COMPILER:FILEPATH=/usr/bin/c++
//C compiler.
CMAKE_C_COMPILER:FILEPATH=/usr/bin/cc
执行 /usr/bin/c++ --version 和 /usr/bin/cc --version,发现输出的版本号仍然是5.1.0,这就有点莫名其妙了。
google搜索出了一个github issue:https://github.com/Kingsford-Group/genesum/issues/2,在里面找到了解决方案:
**
cmake -DCMAKE_CXX_COMPILER=KaTeX parse error: Double subscript at position 22: … g++) -DCMAKE_C_̲COMPILER=(which gcc) ./
**
执行之后果然可以了,并且重新打开了CMakeCache.txt之后发现,编译器的两个选项改变了:
//CXX compiler.
CMAKE_CXX_COMPILER:FILEPATH=/usr/local/bin/g++
//C compiler.
CMAKE_C_COMPILER:FILEPATH=/usr/local/bin/gcc
这两个路径与命令 which gcc 和 which g++的输出一致。
猜测手动改CMakeCache.txt 的这两项应该也可以解决问题,比较困惑的就是,为何运行/usr/bin/c++ --version得到的版本号仍然是5.1.0?
这个疑惑要留待以后来解决了。
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