[CMake] Better BlueGene/P and cross-compile support for CMake

[David Cole]

Brad King pushed this fix to cmake 'next' earlier today:

http://cmake.org/gitweb?p=cmake.git;a=commitdiff;h=68c7d3e2ce2fb98980887357dd6308246ea3d64e

That, at least, addresses the "-l" issue in FindMPI...


HTH,
David


On Thu, Jun 24, 2010 at 4:52 PM, Alexander Neundorf <a.neundorf-work at gmx.net
> wrote:

> On Thursday 24 June 2010, Marcel Loose wrote:
> > Oops! Forgot to CC to the list.
> >
> >
> > Hi Tod,
> >
> > I'll try to answer some of your questions below inline (I've snipped off
> > parts of your mail). We're also using a BlueGeneP, but not for so many
> > packages/executables as you probably do.
> >
> > On Wed, 2010-06-23 at 01:02 -0700, Todd Gamblin wrote:
> > > Hi,
> >
> > -- 8< ----- 8< ----- 8< ----- 8< ----- 8< ----- 8< ----- 8< ----- 8< --
> >
> > > I was able to build with either if I just manually specified the
> > >
> > > compilers and linker like this:
> > > > env CC=gcc C++=g++ LD=ld ./bootstrap --prefix=${CMAKE_HOME}
> > > >
> > > >
> > > > env CC=xlc C++=xlC LD=xlC ./bootstrap --prefix=${CMAKE_HOME}
> >
> > That is probably the safest way to do it, anyways. You then have full
> > control over which compiler is used to build your stuff.
> >
> > > But It would've been nice if I didn't have to do all that.  Is PPC
> > > Linux not used many other places anymore?  I guess this is a
> > > sles10/ppc64 environment, so maybe that is throwing the script off.
> > >
> > >
> > >
> > >
> > > 2. The FindMPI module's library search breaks because the the
> > > cross-compiler name on BlueGene/P contains -l. Specifically, the GNU
> > >
> > > compute node compilers on BlueGene/P are named like this:
> > > > powerpc-bgp-linux-g++
> > >
> > > And the FindMPI module claims that it can't find the '-inux-g++'
> > > library, or something similar.  I was able to fix this by modifying
> > > FindMPI's search to look for -l only when it's followed by a space.
> > >  This is a little worrisome because I think that is a standard gnu
> > > naming convention, so other platforms with compilers named blah-linux
> > > are going to have the same bug.
> >
> > That is a known bug. I've filed it in the bug tracker
> > http://www.vtk.org/Bug/view.php?id=9093. I've also uploaded a patch
> > (take the second one), that fixes that problem.
>
> In the bug report you say "This patch is NOT heavily tested!"
>
> Is this still true ?
>
> Alex
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