cmake指定编译器

https://gitlab.kitware.com/cmake/community/-/wikis/FAQ#how-do-i-use-a-different-compiler

1. 使用环境变量

CC=/usr/bin/gcc-4.2 CXX=/usr/bin/g++-4.2 cmake -G "Your Generator" path/to/your/source

2. 

use cmake -D

cmake -G "Your Generator" -D CMAKE_C_COMPILER=gcc-4.2 -D CMAKE_CXX_COMPILER=g++-4.2 path/to/your/source

3 (avoid): use set()

set(CMAKE_C_COMPILER "gcc-4.2")
set(CMAKE_CXX_COMPILER "/usr/bin/g++-4.2")

project("YourProjectName")