[CMake] build type specific compiler flags

[Filipe Sousa]

Jesper Eskilson wrote:
> Hi!
> 
> I would like to be able to specify compiler flags (or -D options,
> specifically) bound to a specific build type, i.e. Debug, Release,
> etc. How can I do this? There is a target property
> LINK_FLAGS_<CONFIG>, but there is no COMPILE_FLAGS_<CONFIG>.
> 

http://www.cmake.org/Wiki/CMake_Useful_Variables :
"""
 CMAKE_BUILD_TYPE 
    Choose the type of build. CMake has default flags for these: 

    * None (CMAKE_C_FLAGS or CMAKE_CXX_FLAGS used)
    * Debug (CMAKE_C_FLAGS_DEBUG or CMAKE_CXX_FLAGS_DEBUG)
    * Release (CMAKE_C_FLAGS_RELEASE or CMAKE_CXX_FLAGS_RELEASE)
    * RelWithDebInfo (CMAKE_C_FLAGS_RELWITHDEBINFO or CMAKE_CXX_FLAGS_RELWITHDEBINFO
    * MinSizeRel (CMAKE_C_FLAGS_MINSIZEREL or CMAKE_CXX_FLAGS_MINSIZEREL) 

Example: SET(CMAKE_BUILD_TYPE Debug)

You can create your own build type like this:
SET(CMAKE_BUILD_TYPE distribution)
SET(CMAKE_CXX_FLAGS_DISTRIBUTION "-O3")
SET(CMAKE_C_FLAGS_DISTRIBUTION "-O3")

Note that CMAKE_BUILD_TYPE is not initialized with a readable value at configuration time. 
This is because the user is free to select a build type at build time.
"""

Filipe Sousa

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