Optimize cflags for architecture features

Here is a cmake module and sample program to optimize architecture features such as a SIMD extensions.

STATUS

• Module CMakeHostSystemInformationExtra/function cmake_host_system_information_extra() is production ready on x86_64 and ARM platforms.
  • Tested on Linux, Mac, Windows with gcc, clang and icc on x86_64.
  • Tested on Linux on ARM using AWS EC2 A1 instance.
• Module CMakeCompilerMachineOption() is experimental status.

How to use?

1. Place cmake scripts under Modules folder in your project and add search path in your CMakeLists.txt by setting CMAKE_MODULE_PATH variable.

2. Include script using

include(CMakeHostSystemInformationExtra)
include(GetCPUSIMDFeatures)
include(CMakeCompilerMachineOption)

in your CMakeLists.txt

3. Call function cmake_host_system_information_extra(RESULT <output variable name> QUERY <query> ...) to detect host system information.

4. Optimize compiler options

Here is an example to optimize example project for skylake generation of Intel CPU.

set(TARGET_ARCHITECTURE skylake)
cmake_compiler_machine_option(ARCHITECTURE_FLAG ${TARGET_ARCHITECTURE})
message(STATUS "Use compiler option: ${ARCHITECTURE_FLAG}")
add_executable(example example.c)
target_compile_options(example PRIVATE ${ARCHITECTURE_FLAG})

Please see CMakeLists.txt for more details.

License

This is distributed under OSI-Approved 3-Clause BSD license.