[gmx-developers] cmake goes into eternal loop

[Jeff Hammond]

See http://cmake.3232098.n2.nabble.com/Infinite-loop-with-cmake-2-8-10-2-td7582723.html
for details.  The fix is crude but trivial.

There are a number of references to "cmake infinite loop" on Google,
btw.  It seems that they are all related to the same fundamental
problem but I haven't verified this.

Jeff

On Thu, May 9, 2013 at 8:44 AM, David van der Spoel
<spoel at xray.bmc.uu.se> wrote:
> Hi,
>
> I'm trying to compile the master branch using clang and having the following
> problem:
>
> % setenv CC ~/bin/checker-274/bin/clang
> % setenv CXX ~/bin/checker-274/bin/clang++
> % cmake -DGMX_CPU_ACCELERATION=None -DGMX_GPU=OFF -DCMAKE_CXX_COMPILER=$CXX
> -DCMAKE_C_COMPILER=$CC -DGMX_OPENMP=OFF -i ..
>
> Would you like to see advanced options? [No]:
> Please wait while cmake processes CMakeLists.txt files....
>
> You have changed variables that require your cache to be deleted.
> Configure will be re-run and you may have to reset some variables.
> The following variables have changed:
> CMAKE_C_COMPILER= /Users/spoel/bin/checker-274/bin/clang
> CMAKE_CXX_COMPILER= /Users/spoel/bin/checker-274/bin/clang++
>
> CMake Warning at CMakeLists.txt:237 (message):
>   The compiler you are using does not support OpenMP parallelism.  This
> might hurt your performance a lot, in particular with GPUs.  Try using a
> more recent version, or a different compiler.  For now, we are proceeding by
> turning off OpenMP.
>
> And these last two text blocks repeat until I Ctrl-C it.
>
> Any clue?
> Note that I turn off OpenMP manually but that doesn't seem to be registered.
>
>
> --
> David van der Spoel, Ph.D., Professor of Biology
> Dept. of Cell & Molec. Biol., Uppsala University.
> Box 596, 75124 Uppsala, Sweden. Phone:  +46184714205.
> spoel at xray.bmc.uu.se    http://folding.bmc.uu.se
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-- 
Jeff Hammond
Argonne Leadership Computing Facility
University of Chicago Computation Institute
jhammond at alcf.anl.gov / (630) 252-5381
http://www.linkedin.com/in/jeffhammond
https://wiki.alcf.anl.gov/parts/index.php/User:Jhammond
ALCF docs: http://www.alcf.anl.gov/user-guides