From kde-buildsystem  Tue Nov 06 23:25:42 2007
From: Alexander Neundorf <neundorf () kde ! org>
Date: Tue, 06 Nov 2007 23:25:42 +0000
To: kde-buildsystem
Subject: Re: cmake resets variables
Message-Id: <200711070025.42870.neundorf () kde ! org>
X-MARC-Message: https://marc.info/?l=kde-buildsystem&m=119439155318095

On Tuesday 06 November 2007, Thiago Macieira wrote:
> Em Tuesday 06 November 2007 14:23:03 Lubos Lunak escreveu:
> >  Hello,
> >
> >  since kBacktrace() is not that useful with hidden symbols, I explicitly
> > run cmake with -D__KDE_HAVE_GCC_VISIBILITY=0, which turns it off.
> > However, any single change to any CMakeLists.txt re-runs automatically
> > cmake, which also runs the cmake test for hidden symbols and enables them
> > (interestingly, after yet another change it doesn't run it again). I
> > always get undefined symbols as a result of this and I'm getting kind of
> > tired of running cmake manually all the time.
> >
> >  Does somebody know how to fix this?
>
> Make the variable cached.

and put a flag variable in the cache which signals "test already done".
Like:

IF(NOT DEFINED GCC_VISIBILITY_TEST_DONE)
   ... do the test
   set(GCC_VISIBILITY_TEST_DONE TRUE CACHE BOOL "Test done")
ENDIF(NOT DEFINED GCC_VISIBILITY_TEST_DONE)


Alex

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