cmake-02-hostcheck

CMAKE_SYSTEM_NAME(os distribution)

	cmake_minimum_required(VERSION 3.5 FATAL_ERROR)
	
	# project name, in this case no language required
	project(recipe-01 LANGUAGES NONE)
	
	# print custom message depending on the operating system
	if(CMAKE_SYSTEM_NAME STREQUAL "Linux")
	  message(STATUS "Configuring on/for Linux")
	elseif(CMAKE_SYSTEM_NAME STREQUAL "Darwin")
	  message(STATUS "Configuring on/for macOS")
	elseif(CMAKE_SYSTEM_NAME STREQUAL "Windows")
	  message(STATUS "Configuring on/for Windows")
	elseif(CMAKE_SYSTEM_NAME STREQUAL "AIX")
	  message(STATUS "Configuring on/for IBM AIX")
	else()
	  message(STATUS "Configuring on/for ${CMAKE_SYSTEM_NAME}")
	endif()

#log
	$ cmake .
	-- Configuring on/for Linux
	-- Configuring done
	-- Generating done
	-- Build files have been written to: /home/jianleya/trainning/cmake/cmake/cmake-cookbook/cmake-cookbook/chapter-02/recipe-01/example

CMAKE_SYSTEM_NAME (platform independent code)

cmake_minimum_required(VERSION 3.5 FATAL_ERROR)
project(recipe-02 LANGUAGES CXX)
add_executable(hello-world hello-world.cpp)

# let the preprocessor know about the system name
if(CMAKE_SYSTEM_NAME STREQUAL "Linux")
  target_compile_definitions(hello-world PUBLIC "IS_LINUX")
endif()
if(CMAKE_SYSTEM_NAME STREQUAL "Darwin")
  target_compile_definitions(hello-world PUBLIC "IS_MACOS")
endif()
if(CMAKE_SYSTEM_NAME STREQUAL "Windows")
  target_compile_definitions(hello-world PUBLIC "IS_WINDOWS")
endif()

#include 
#include 
#include 

std::string say_hello() {
#ifdef IS_WINDOWS
  return std::string("Hello from Windows!");
#elif IS_LINUX
  return std::string("Hello from Linux!");
#elif IS_MACOS
  return std::string("Hello from macOS!");
#else
  return std::string("Hello from an unknown system!");
#endif
}

int main() {
  std::cout << say_hello() << std::endl;
  return EXIT_SUCCESS;
}

CMAKE_CXX_COMPILER_ID (compiler ID)

cmake_minimum_required(VERSION 3.5 FATAL_ERROR)

# project name and language
project(recipe-03 LANGUAGES CXX)

add_executable(hello-world hello-world.cpp)

# compiler name
target_compile_definitions(hello-world PUBLIC "COMPILER_NAME=\"${CMAKE_CXX_COMPILER_ID}\"")

# let the preprocessor know about the compiler vendor
if(CMAKE_CXX_COMPILER_ID MATCHES Intel)
  target_compile_definitions(hello-world PUBLIC "IS_INTEL_CXX_COMPILER")
endif()
if(CMAKE_CXX_COMPILER_ID MATCHES GNU)
  target_compile_definitions(hello-world PUBLIC "IS_GNU_CXX_COMPILER")
endif()
if(CMAKE_CXX_COMPILER_ID MATCHES PGI)
  target_compile_definitions(hello-world PUBLIC "IS_PGI_CXX_COMPILER")
endif()
if(CMAKE_CXX_COMPILER_ID MATCHES XL)
  target_compile_definitions(hello-world PUBLIC "IS_XL_CXX_COMPILER")
endif()
# etc ...

#include 
#include 
#include 

std::string say_hello() {
#ifdef IS_INTEL_CXX_COMPILER
  // only compiled when Intel compiler is selected
  // such compiler will not compile the other branches
  return std::string("Hello Intel compiler!");
#elif IS_GNU_CXX_COMPILER
  // only compiled when GNU compiler is selected
  // such compiler will not compile the other branches
  return std::string("Hello GNU compiler!");
#elif IS_PGI_CXX_COMPILER
  // etc.
  return std::string("Hello PGI compiler!");
#elif IS_XL_CXX_COMPILER
  return std::string("Hello XL compiler!");
#else
  return std::string("Hello unknown compiler - have we met before?");
#endif
}

int main() {
  std::cout << say_hello() << std::endl;
  std::cout << "compiler name is " COMPILER_NAME << std::endl;
  return EXIT_SUCCESS;
}

CMAKE_HOST_SYSTEM_PROCESSOR(cpu arch)

cmake_minimum_required(VERSION 3.5 FATAL_ERROR)
project(recipe-04 LANGUAGES CXX)

# define executable and its source file
add_executable(arch-dependent arch-dependent.cpp)

# let the preprocessor know about the size of void *
if(CMAKE_SIZEOF_VOID_P EQUAL 8)
  target_compile_definitions(arch-dependent PUBLIC "IS_64_BIT_ARCH")
  message(STATUS "Target is 64 bits")
else()
  target_compile_definitions(arch-dependent PUBLIC "IS_32_BIT_ARCH")
  message(STATUS "Target is 32 bits")
endif()

# host cpu architecture
if(CMAKE_HOST_SYSTEM_PROCESSOR MATCHES "i386")
  message(STATUS "i386 architecture detected")
elseif(CMAKE_HOST_SYSTEM_PROCESSOR MATCHES "i686")
  message(STATUS "i686 architecture detected")
elseif(CMAKE_HOST_SYSTEM_PROCESSOR MATCHES "x86_64")
  message(STATUS "x86_64 architecture detected")
else()
  message(STATUS "host processor architecture is unknown")
endif()

target_compile_definitions(arch-dependent
  PUBLIC "ARCHITECTURE=${CMAKE_HOST_SYSTEM_PROCESSOR}"
  )

#include 
#include 
#include 

#define STRINGIFY(x) #x
#define TOSTRING(x) STRINGIFY(x)

std::string say_hello() {
  std::string arch_info(TOSTRING(ARCHITECTURE));
  arch_info += std::string(" architecture. ");
#ifdef IS_32_BIT_ARCH
  return arch_info + std::string("Compiled on a 32 bit host processor.");
#elif IS_64_BIT_ARCH
  return arch_info + std::string("Compiled on a 64 bit host processor.");
#else
  return arch_info + std::string("Neither 32 nor 64 bit, puzzling ...");
#endif
}

int main() {
  std::cout << say_hello() << std::endl;
  return EXIT_SUCCESS;
}

cpu instruction set

cmake_minimum_required(VERSION 3.10 FATAL_ERROR)
project(recipe-05 LANGUAGES CXX)

# define executable
add_executable(processor-info "")

# and its source file
target_sources(processor-info
  PRIVATE
    processor-info.cpp
  )

# and its include directories
target_include_directories(processor-info
  PRIVATE
    ${PROJECT_BINARY_DIR}
  )

foreach(key
  IN ITEMS
    NUMBER_OF_LOGICAL_CORES
    NUMBER_OF_PHYSICAL_CORES
    TOTAL_VIRTUAL_MEMORY
    AVAILABLE_VIRTUAL_MEMORY
    TOTAL_PHYSICAL_MEMORY
    AVAILABLE_PHYSICAL_MEMORY
    IS_64BIT
    HAS_FPU
    HAS_MMX
    HAS_MMX_PLUS
    HAS_SSE
    HAS_SSE2
    HAS_SSE_FP
    HAS_SSE_MMX
    HAS_AMD_3DNOW
    HAS_AMD_3DNOW_PLUS
    HAS_IA64
    OS_NAME
    OS_RELEASE
    OS_VERSION
    OS_PLATFORM
  )
  cmake_host_system_information(RESULT _${key} QUERY ${key})
endforeach()

configure_file(config.h.in config.h @ONLY)

//cxx-example/config.h.in
#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@"

//cxx-example/processor-info.cpp
#include "config.h"

#include 
#include 

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;
}