[CMake] Warning D9025 : overriding '/W3' with '/W4'

[Philip Lowman]

On Mon, Jan 18, 2010 at 7:17 PM, Mateusz Loskot <mateusz at loskot.net> wrote:
> Hi,
>
> In CMakeLists.txt I have something like this:
>
> if(MSVC)
>  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /W4")
> endif()
>
> I configure my build using command prompt of Visual Studio 2005 (8.0):
>
> D:\dev\geos\_svn\build-nmake>cmake -G "NMake Makefiles" ..\trunk
>
> and the compiler flags look as follows:
>
> CMAKE_CXX_FLAGS= /DWIN32 /D_WINDOWS /W3 /Zm1000 /EHsc /GR /W4 /MP
>
> I build and I'm getting D9025 warning:
>
> D:\dev\geos\_svn\build-nmake> nmake
>
> Microsoft (R) Program Maintenance Utility Version 8.00.50727.762
> Copyright (C) Microsoft Corporation.  All rights reserved.
>
> [  0%] Building CXX object src/CMakeFiles/geos.dir/algorithm/Angle.cpp.obj
> cl : Command line warning D9025 : overriding '/W3' with '/W4'
>
>
> Would it be possible to get rid of this warning with some CMake magic?


Yes, you can use a regular expression to search and replace the
contents of CMAKE_CXX_FLAGS "/W3" (or /W[0-9]) with /W4... see
string(REGEX REPLACE...) in the docs.

Alternatively (and slightly better), you can create separate files
that will set the default MSVC compilation flags for you.  You'd do
something like in the example below, but instead of
CMAKE_CXX_FLAGS_DEBUG, CMAKE_CXX_FLAGS_RELEASE, etc., you would only
need to specify CMAKE_C_FLAGS and CMAKE_CXX_FLAGS and make them
whatever they are in the CACHE by default but with /W4 instead of /W3.

http://www.itk.org/Wiki/CMake_FAQ#Make_Override_Files


-- 
Philip Lowman