[CMake] what is the right way to set CMAKE_USE_RELATIVE_PATHS?

[Michael Jackson]

There are lots of questions on this CMake variable and the consensus  
is DO NOT USE IT. PERIOD. The implementation is basically broken for  
all but the most trivial case.
_________________________________________________________
Mike Jackson                  mike.jackson at bluequartz.net
BlueQuartz Software                    www.bluequartz.net
Principal Software Engineer                  Dayton, Ohio

On Dec 21, 2009, at 3:59 PM, John Drescher wrote:

> On Mon, Dec 21, 2009 at 3:50 PM, Claus Klein  
> <claus.klein at arcormail.de> wrote:
>> Hi all,
>>
>> I tried to use:
>>   set(CMAKE_USE_RELATIVE_PATHS ON)
>> in my CMakeLists.txt.
>>
>> But I noticed, that some cmake variables can't be changed in that  
>> way.
>> In the CMakeCache.txt, it is still OFF?
>>
> I have no idea about CMAKE_USE_RELATIVE_PATHS since I have never
> needed/wanted to use that however for the other cases that it appears
> the CMake does not let me change a value I usually get around this
> using the following examples:
>
> SET (CMAKE_INSTALL_PREFIX ${PGM_FILES}/UPMC/${CMAKE_PROJECT_NAME}
> CACHE STRING "Default Install Path" FORCE)
>
>
> IF (MAKE_DEBUGRELEASE)
> SET (CMAKE_CONFIGURATION_TYPES "Debug;RelWithDebInfo" CACHE STRING
> "Debug;RelWithDebInfo" FORCE)
> SET (RELEASE_BUILD_NAME "RelWithDebInfo")
> ELSE(MAKE_DEBUGRELEASE)
> SET (CMAKE_CONFIGURATION_TYPES "Debug;Release" CACHE STRING
> "Debug;Release" FORCE)
> SET (RELEASE_BUILD_NAME "Release")
> ENDIF (MAKE_DEBUGRELEASE)
>
>
> The keys are CACHE and FORCE.
>
>
> John
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