Hi Alan,
>
> IF("${VARIABLE}" MATCHES "^${VARIABLE}$")
>
> Is CMake-2.2 (or so) logic which I never understood either, but from
> explanations I got years ago on the CMake mailing list it works on all
> versions of CMake just like the more modern
>
> IF(NOT DEFINED VARIABLE)
>
> which is true if the variable has not been set at all, but false
> otherwise
> (even if the variable has been set to ""). So reusing the HAVE_FINITE
> variable the way you propose above just won't work.
>
>
>
> I suggest you drop all re-use of variables for the reasons I
> mentioned to
> produce a reliable result in all cases (not just the ones you have
> tested
> so far).
>
> So I suggest this version which stores the result in the uncached
> variable
> HAVE_FINITE with everything else in cached variables which are
> marked as
> advanced. (This follows the suggestion for the best way to return
> results
> from CMake modules.)
>
> check_symbol_exists(finite "math.h" HAVE_FINITE_SYMBOL)
> if(HAVE_FINITE_SYMBOL)
> set(HAVE_FINITE ON)
> else(HAVE_FINITE_SYMBOL)
> check_function_exists(finite HAVE_FINITE_FUNCTION)
> if(HAVE_FINITE_FUNCTION)
> set(HAVE_FINITE ON)
> else(HAVE_FINITE_FUNCTION)
> check_symbol_exists(_finite "math.h" HAVE__FINITE_SYMBOL)
> if(HAVE__FINITE_SYMBOL)
> set(HAVE_FINITE ON)
> else(HAVE__FINITE_SYMBOL)
> check_function_exists(_finite "math.h" HAVE__FINITE_FUNCTION)
> if(HAVE__FINITE_FUNCTION)
> set(HAVE_FINITE ON)
> endif(HAVE__FINITE_FUNCTION)
> endif(HAVE__FINITE_SYMBOL)
> endif(HAVE_FINITE_FUNCTION)
> endif(NOT HAVE_FINITE_SYMBOL)
>
> mark_as_advanced(
> HAVE_FINITE_SYMBOL
> HAVE_FINITE_FUNCTION
> HAVE__FINITE_SYMBOL
> HAVE__FINITE_FUNCTION
> )
I have more or less implemented it as you suggested. I didn't marked
the variables as advanced since they are INTERNAL CACHE anyway, so
they don't show up for the cmake-gui.
I hope this is now okay ;)
Thanks for your help,
Werner
>
> Note, I have not checked this completely so there might be a typo in
> there,
> but The above logic has clean flow which I presume most CMake users
> can
> understand at a glance. It follows the rule there is no re-use of
> check_function/symbol_exists variables for other purposes, and
> HAVE_FINITE
> gets set properly (or not at all if no alternative works) the first
> time. On
> subsequent times HAVE_FINITE gets set quite rapidly from the cached
> values
> of the advanced variables since the search is skipped entirely inside
> check_????_exists and the existing cached value of the unique
> variable left
> untouched, instead.
>
> HTH.
>
> Alan
> __________________________
> Alan W. Irwin
>
> Astronomical research affiliation with Department of Physics and
> Astronomy,
> University of Victoria (astrowww.phys.uvic.ca).
>
> Programming affiliations with the FreeEOS equation-of-state
> implementation
> for stellar interiors (freeeos.sf.net); PLplot scientific plotting
> software
> package (plplot.org); the libLASi project (unifont.org/lasi); the
> Loads of
> Linux Links project (loll.sf.net); and the Linux Brochure Project
> (lbproject.sf.net).
> __________________________
>
> Linux-powered Science
> __________________________
>
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--
Dr. Werner Smekal
Institut fuer Allgemeine Physik
Technische Universitaet Wien
Wiedner Hauptstr 8-10
A-1040 Wien
Austria
email: [email protected]
web: http://www.iap.tuwien.ac.at/~smekal
phone: +43-(0)1-58801-13463 (office), +43-(0)1-58801-13469 (laboratory)
fax: +43-(0)1-58801-13499
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-OSBC tackles the biggest issue in open source: Open Sourcing the Enterprise
-Strategies to boost innovation and cut costs with open source participation
-Receive a $600 discount off the registration fee with the source code: SFAD
http://p.sf.net/sfu/XcvMzF8H
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