[CMake] Specifying different warning levels for debug and release

[Jack Kelly]

Paul Richards wrote:
> Hi,
> Is there a way to specify different warning levels for debug and release?
> 
> Under Visual Studio 2003 we like to build debug with warning level 4,
> and release at warning level 3.
> 
> Can CMake do this?

I don't know if Visual Studio uses CFLAGS for warning level (I assume it 
does), but this is how I'd do it for gcc:

IF(CMAKE_COMPILER_IS_GNUCC)
   SET(CMAKE_C_FLAGS_DEBUG -g -Wall -Werror)
   SET(CMAKE_C_FLAGS_RELEASE -O2 -pipe -fomit-frame-pointer -DNDEBUG)
   # And the other build types if necessary
ENDIF(CMAKE_COMPILER_IS_GNUCC)

Similarly, you can test for CMAKE_COMPILER_IS_GNUCXX and set 
CMAKE_CXX_FLAGS_*

The CFLAG variable used depends on CMAKE_BUILD_TYPE: None, Debug, 
Release, RelWithDebInfo, MinSizeRel, each of which corresponding to an 
appropriate CMAKE_LANG_FLAGS_TYPE entry in the cache.

Perhaps testing on IF(MSVC) will be helpful for you. See 
http://www.cmake.org/Wiki/CMake_Useful_Variables

-- Jack