cmake引入openmp
cmake引入openmp的方式非常简单，遵循以下步骤即可：
1 cmake find_package查找openmp
使用cmake中find_package指令查找openmp,格式如下
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#.. cmake other message
find_package ( OpenMP REQUIRED )
#... cmake other message
Copy 2 cmake target_link_libraries链接openmp
与常见链接第三方库一样，使用target_link_libraries指令将openmp链接到具体项目，格式如下：
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# 在链接之前先判断是否已经搜索到openmp
if ( OpenMP_FOUND )
target_link_libraries ( ${ you_executable_name } OpenMP::OpenMP_CXX )
else ()
message ( FATAL_ERROR "openmp not found!" )
endif ()
Copy 3 代码中引入
在需要openmp并行优化的代码文件中包含openmp头文件，例子如下：
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#include <omp.h>
#include <iostream>
int main ( int argc , char ** argv )
{
std :: cout << "lean openmp: cmake import openmp example. \n " ;
#pragma omp parallel for
for ( int i = 0 ; i < 10 ; ++ i )
{
std :: cout << "i = " << i << std :: endl ;
}
return 0 ;
} >
Copy 执行上面程序可能的结果:
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lean openmp: cmake import openmp example.
i = i = i = i = i = i = i = i = 1639
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i = 7
0
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i = 4
Copy 可看到，for循环是并行执行输出的结果。
本文练习代码已上传至github:https://github.com/mangosroom/learn-openmp/tree/main/cmake_example
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