On 24 Oct 2011, at 13:17, Geoff McLane wrote:
>
> In my case I like to be able to compile
> against different versions of say OSG - like -
>
> OSG301=1 # stable release 3.0.1 - default
> OSG283=0 # general release 283 - option
> OSG299=0 # another development release
> OSGTRUNK=0 # option, for 'trunk' version
>
> I have yet to try the idea from Mathius, using
> a semi-colon set of paths, maybe replacing some
> or all the 'export' items, like -
> -D "CMAKE_PREFIX_PATH=/path/to/osg;/path/to/simgear;..."
> - this seems a good idea to try... maybe cmake
> will like it ;=))
Okay, *but*, for your own sanity, you need to keep the Simgear-built-against
each of these separate too (anf FlightGear). By all means install each OSG
somewhere special, but then you need to build FG and SG against the same
version - so you may as well share a prefix for that build config (this is what
Jenkins does to build trunk OSG vs stable)
Put it another way - you need to reconfigure and rebuild SG & FG entirely, when
switching OSG version, so I don't see any problem with installing to the prefix
for that OSG build too.
I'd do:
mkdir osg-build-301
cd osg-build-301
cmake ../path/to/osg-301-source
-DCMAKE_INSTALL_PREFIX=/path/to/install/dist-osg-301
make install
cd ..
mkdir sg-build-with-osg-301
cd sg-build-with-osg-301
cmake ../path/to/simgear
-DCMAKE_INSTALL_PREFIX=/path/to/install/dist-osg-301
make install
cd ..
... and repeat once more for FlightGear
Mathias' suggestion also works, BTW - specify CMAKE_PREFIX_PATH, with one (or
several) paths to search - I tested that this morning and updated the README.
As you guessed, manually setting the the detection variables
(SIMGEAR_VERSION_OK, etc) is a bad idea, unless you set *all* the generated
variables correctly - not impossible, but a lot of work. The error you report
looks like it's happening because the detection script has got confused, but I
need to see the arguments / environment passed to CMake, to understand why.
James
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