[cmake-developers] Extend CMAKE_<LANG>_FLAGS(_<CONFIG>) from a CMake Toolchain

[Brad King]

On 08/23/2017 09:56 AM, maikel van den Hurk wrote:
> I was wondering why there is no ability to define CMAKE_<LANG>_FLAGS(_<CONFIG>) within a CMake Toolchain file, but still benefit from the CMAKE_<LANG>_INIT_FLAGS(_<CONFIG>) detected from CMake internals. 

This has been possible since commit v3.7.0-rc1~392^2 (Honor
CMAKE_<LANG>_FLAGS[_<CONFIG>]_INIT set in toolchain files,
2016-07-05).  See the CMake 3.7 release notes:

  https://cmake.org/cmake/help/v3.9/release/3.7.html#variables
  "Toolchain files may now set a CMAKE_<LANG>_FLAGS_INIT variable
  to initialize the CMAKE_<LANG>_FLAGS cache entry the first time
  a language is enabled in a build tree."

See documentation here:

  https://cmake.org/cmake/help/v3.9/variable/CMAKE_LANG_FLAGS_INIT.html

-Brad