Alexander Neundorf wrote:
On Thursday 12 March 2009, Adolfo Rodríguez wrote:
We currently use three of CMake's generators: "Unix Makefiles",
"KDevelop3", and "Eclipse CDT4 - Unix Makefiles", and we're interested in
doing parallel builds. Doing so with makefiles is trivial (make -j#), as
well as with KDevelop3 (only _one_ parameter must be edited in the build
options of the project). However Eclipse is still eluding me (I must
confess that I'm quite new to it).
My current hack is to edit individual targets and change the name of the
target from, say 'all' to '-j# all', and it works. However, I haven't found
a project-wide policy that if edited once, will affect all targets. I
cannot set the default build command, because apparently CMake generates
each target with a custom build command.
Any clues from the CMake-Eclipse experts?
I'm using CMake 2.6.2 and Eclipse CDT5 (not CDT4, could this be an issue?)
I don't think so.
We could add some special variable, like
CMAKE_MAKEFILE_PROJECT_FLAGS or CMAKE_MAKEFILE_PARALLELITY, and use this in
the makefile-based generators to set the "-jx" parameter for make.
But then again, this shouldn't be hardcoded in the CMakeLists.txt, so it could
only be a cache variable.
Or should cmake try to determine automatically how many cores there are and
add "-jx" automatically ? E.g. using sysconf(_SC_NPROCESSORS_ONLN) ?
This could also be disabled by default and enabled e.g. via an option like
CMAKE_AUTOMATIC_PARALLEL_MAKE_INVOCATION or something like this.
I believe that this must be configurable - using distcc, developers may
want to build with -jx > the number of local cores.
Cheers,
Tim
--
Timothy M. Shead
Data Analysis & Visualization (1424)
Sandia National Laboratories
505-284-0139
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