[CMake] CTest parallel builds, serial tests

[Nils Gladitz]

I use CTest scripts for the build (ctest -S) which set CTEST_BUILD_COMMAND.
Alternatively I think setting CTEST_BUILD_FLAGS to add flags to the 
build command instead of replacing it should work as well.

Subsequent calls to "ctest_build()" in the script pick up and use the 
command as set earlier.

Nils

On 10/03/2012 01:14 AM, Matt.Bolger at csiro.au wrote:
>
> We have a simple automated test/build setup. A basic CTestConfig.cmake 
> sets the project name and CTEST_DROP properties and the test server 
> simply runs "ctest --D Nightly" or "ctest --D Experimental" to process 
> a build.
>
> I have two problems that I think I could solve if I can work out how 
> to specify additional options for the make command used to do the 
> build. To debug a rare issue we're having I'd like to be able to use 
> "make --d" and I would also like to be able to perform the build in 
> parallel "make --j8" but run the tests in serial (this seems to rule 
> out using "ctest --j8")
>
> First I thought I could use the "--build-options 
> <http://www.cmake.org/cmake/help/v2.8.8/ctest.html#opt:--build-options>" 
> option in CTest but after having no luck and looking at the source it 
> looks like this option is only used when "--build-and-test" is 
> requested perhaps? It appears that a number of these command (eg 
> --build-makeprogram) are only used by CTest when used in conjunction 
> with certain other options and not when using "-D"?
>
> I've found some old posts that talk about using a CTest scripting file 
> to set the initial cache value  "MAKECOMMAND:STRING=/usr/bin/make -i 
> -j8" or "set(CTEST_BUILD_COMMAND "make -j4 -i") " -- I haven't had 
> much luck with this so far and am wondering if this is still a 
> valid/recommended approach?
>
> Any advice would be greatly appreciated.
>
> Thanks
>
> Matt
>
>
>
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-- 
Nils Gladitz, B.Sc.
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