[CMake] Change variable default

[Ilja Golshtein]

Tim,

I guess the difference is "project" command defines 
CMAKE_CXX_FLAGS_DEBUG and does not define CMAKE_Fortran_FLAGS_DEBUG.

Regarding  CMAKE_*_FLAGS_*_INIT, you are right, but what if user explicitly set the same value as INIT? 
It would be overwritten!

Anyway, I am happy with the solution to put CMAKE_CXX_FLAGS_DEBUG
before "project" command.

Thank you!


28.04.2011, 20:49, "Tim Gallagher" <tim.gallagher at gatech.edu>:
> To put it in context, our cmake file looks like:
>
> <define project/language/etc>
> <find required libraries>
> if(${CMAKE_Fortran_COMPILER_ID} STREQUAL "Intel")
>    if(NOT CMAKE_Fortran_FLAGS_RELEASE)
>       set(CMAKE_Fortran_FLAGS_RELEASE "-O2 -xhost" CACHE STRING "" FORCE)
>    endif()
>   set(CMAKE_Fortran_FLAGS_DEBUG
>       "${CMAKE_Fortran_FLAGS_DEBUG} -check noarg_temp_created -C -traceback" CA\
> CHE STRING "" FORCE)
> endif()
> <setup options for the project>
> <define executable>
>
> The other way you can try it, if it's not empty, is to do
>
> if(${CMAKE_Fortran_FLAGS_RELEASE} STREQUAL ${CMAKE_Fortran_FLAGS_RELEASE_INIT})
>
> As far as I know, CMAKE_*_FLAGS_*_INIT are the default values that it gets set to when cmake starts up. So if you check against that, you will see if the user has modified it.
>
> Tim
>
> ----- Original Message -----
> From: "Ilja Golshtein" <ilejncs at narod.ru>;
> To: gtg085x at mail.gatech.edu
> Cc: cmake at cmake.org
> Sent: Thursday, April 28, 2011 12:42:40 PM
> Subject: Re: [CMake] Change variable default
>
> Tim,
>
> thank you.
>
> Compiler and environment specific things become defined during "project" command execution.
> It is too late to check if it is set afterwards because it actually IS SET.
>
> I assume you are lucky and default value for CMAKE_Fortran_FLAGS_RELEASE is
> empty, isn't it?
>
> So the tricky point is to place customization code in proper place.
>
> In my case
> ==
> set(CMAKE_CXX_FLAGS_DEBUG  "-g -wall"
>   CACHE
>   STRING ""
>   )
> ==
> works perfectly if put at the top of CMakeLists.txt
>
> 28.04.2011, 19:23, "Tim Gallagher" <tim.gallagher at gatech.edu>;:
>
>>  We do this:
>>
>>  if(NOT CMAKE_Fortran_FLAGS_RELEASE)
>>     set(CMAKE_Fortran_FLAGS_RELEASE "-O2 -xhost" CACHE STRING "" FORCE)
>>  endif()
>>
>>  In other words, if the flags haven't been set yet (initial start up), set them to what we want. If they have been set (either changed by the user, or specified on the cmake/ccmake line with -D), leave them alone.
>>
>>  Tim
>>
>>  ----- Original Message -----
>>  From: "Ilja Golshtein" <ilejncs at narod.ru>;;
>>  To: cmake at cmake.org
>>  Sent: Thursday, April 28, 2011 9:03:43 AM
>>  Subject: [CMake] Change variable default
>>
>>  Hello!
>>
>>  There are some CMAKE variables with default values. For example CMAKE_CXX_FLAGS_DEBUG default value is '-g'.
>>  How is it possible to make it '-g -Wall'?
>>
>>  What I don't want to have: User choice overwritten.
>>
>>  What I want to have: Modified a variable cmake-time default. It must be possible to change the variable via cmake -D or ccmake GUI.
>>
>>  Thanks.
>>
>>  --
>>  Best regards,
>>  Ilja Golshtein.
>>  _______________________________________________
>>  Powered by www.kitware.com
>>
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> --
> Best regards,
> Ilja Golshtein.
> _______________________________________________
> Powered by www.kitware.com
>
> Visit other Kitware open-source projects at http://www.kitware.com/opensource/opensource.html
>
> Please keep messages on-topic and check the CMake FAQ at: http://www.cmake.org/Wiki/CMake_FAQ
>
> Follow this link to subscribe/unsubscribe:
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-- 
Best regards,
Ilja Golshtein.