本示例中,我们将讨论如何在CMake的帮助下检测主机处理器支持的指令集。这个功能是较新版本添加到CMake中的,需要CMake 3.10或更高版本。检测到的主机系统信息,可用于设置相应的编译器标志,或实现可选的源代码编译,或根据主机系统生成源代码。本示例中,我们的目标是检测主机系统信息,使用预处理器定义将其传递给C++
源代码,并将信息打印到输出中。
#include "config.h"
#include <cstdlib>
#include <iostream>
int main()
{
std::cout << "Number of logical cores: "
<< NUMBER_OF_LOGICAL_CORES << std::endl;
std::cout << "Number of physical cores: "
<< NUMBER_OF_PHYSICAL_CORES << std::endl;
std::cout << "Total virtual memory in megabytes: "
<< TOTAL_VIRTUAL_MEMORY << std::endl;
std::cout << "Available virtual memory in megabytes: "
<< AVAILABLE_VIRTUAL_MEMORY << std::endl;
std::cout << "Total physical memory in megabytes: "
<< TOTAL_PHYSICAL_MEMORY << std::endl;
std::cout << "Available physical memory in megabytes: "
<< AVAILABLE_PHYSICAL_MEMORY << std::endl;
std::cout << "Processor is 64Bit: "
<< IS_64BIT << std::endl;
std::cout << "Processor has floating point unit: "
<< HAS_FPU << std::endl;
std::cout << "Processor supports MMX instructions: "
<< HAS_MMX << std::endl;
std::cout << "Processor supports Ext. MMX instructions: "
<< HAS_MMX_PLUS << std::endl;
std::cout << "Processor supports SSE instructions: "
<< HAS_SSE << std::endl;
std::cout << "Processor supports SSE2 instructions: "
<< HAS_SSE2 << std::endl;
std::cout << "Processor supports SSE FP instructions: "
<< HAS_SSE_FP << std::endl;
std::cout << "Processor supports SSE MMX instructions: "
<< HAS_SSE_MMX << std::endl;
std::cout << "Processor supports 3DNow instructions: "
<< HAS_AMD_3DNOW << std::endl;
std::cout << "Processor supports 3DNow+ instructions: "
<< HAS_AMD_3DNOW_PLUS << std::endl;
std::cout << "IA64 processor emulating x86 : "
<< HAS_IA64 << std::endl;
std::cout << "OS name: "
<< OS_NAME << std::endl;
std::cout << "OS sub-type: "
<< OS_RELEASE << std::endl;
std::cout << "OS build ID: "
<< OS_VERSION << std::endl;
std::cout << "OS platform: "
<< OS_PLATFORM << std::endl;
return EXIT_SUCCESS;
}
#pragma once
#define NUMBER_OF_LOGICAL_CORES @_NUMBER_OF_LOGICAL_CORES@
#define NUMBER_OF_PHYSICAL_CORES @_NUMBER_OF_PHYSICAL_CORES@
#define TOTAL_VIRTUAL_MEMORY @_TOTAL_VIRTUAL_MEMORY@
#define AVAILABLE_VIRTUAL_MEMORY @_AVAILABLE_VIRTUAL_MEMORY@
#define TOTAL_PHYSICAL_MEMORY @_TOTAL_PHYSICAL_MEMORY@
#define AVAILABLE_PHYSICAL_MEMORY @_AVAILABLE_PHYSICAL_MEMORY@
#define IS_64BIT @_IS_64BIT@
#define HAS_FPU @_HAS_FPU@
#define HAS_MMX @_HAS_MMX@
#define HAS_MMX_PLUS @_HAS_MMX_PLUS@
#define HAS_SSE @_HAS_SSE@
#define HAS_SSE2 @_HAS_SSE2@
#define HAS_SSE_FP @_HAS_SSE_FP@
#define HAS_SSE_MMX @_HAS_SSE_MMX@
#define HAS_AMD_3DNOW @_HAS_AMD_3DNOW@
#define HAS_AMD_3DNOW_PLUS @_HAS_AMD_3DNOW_PLUS@
#define HAS_IA64 @_HAS_IA64@
#define OS_NAME "@_OS_NAME@"
#define OS_RELEASE "@_OS_RELEASE@"
#define OS_VERSION "@_OS_VERSION@"
#define OS_PLATFORM "@_OS_PLATFORM@"