[CMake] How to set up user option defaults that depend on other user option defaults?

[Alexander Neundorf]

-------- Original-Nachricht --------
Datum: Mon, 06 Nov 2006 17:52:50 -0800 (PST)
Von: "Alan W. Irwin" <irwin at beluga.phys.uvic.ca>
An: cmake at cmake.org
Betreff: [CMake] How to set up user option defaults that depend on other user option defaults?

> With the PLplot CMake build system I am trying to set up refined
> installation directories for our users that are similar to what they have
> previously used with the autotools configure script.
> 
> Here is a subset of the CMake logic which illustrates the problem:
> 
> set(
> CMAKE_INSTALL_EXEC_PREFIX 
> ${CMAKE_INSTALL_PREFIX}
> CACHE PATH "install location for architecture-dependent files"
> )
> 
> set(
> CMAKE_INSTALL_BINDIR
> ${CMAKE_INSTALL_EXEC_PREFIX}/bin
> CACHE PATH "install location for user executables"
> )
> [...]
> 
> My idea was to mimic the autotools configure script where if you specify
> prefix it overrides exec-prefix unless that is specified by the user.
> Similarly, if you specify exec-prefix (or if it is overridden by prefix)
> it
> forces bindir to be exec-prefix/bin unless bindir is specified by the
> user.

Have a look what we did for KDE, it's the _SET_FANCY() macro:
http://websvn.kde.org/trunk/KDE/kdelibs/cmake/modules/FindKDE4Internal.cmake?rev=602569&view=auto

Bye
Alex

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