[CMake] Parallel builds

[Cory Quammen]

Hi Petr,

VTK exposes the /MP compiler flag in its CMake configuration.

Here is the relevant code from
http://www.vtk.org/gitweb?p=VTK.git;a=blob;f=CMake/vtkDetermineCompilerFlags.cmake;h=1398050afb34ff8c0a74137d847c19a6f63b12e9;hb=HEAD

126
<http://www.vtk.org/gitweb?p=VTK.git;a=blob;f=CMake/vtkDetermineCompilerFlags.cmake;h=1398050afb34ff8c0a74137d847c19a6f63b12e9;hb=HEAD#l126>
# Enable /MP flag for Visual Studio 2008 and greator
127
<http://www.vtk.org/gitweb?p=VTK.git;a=blob;f=CMake/vtkDetermineCompilerFlags.cmake;h=1398050afb34ff8c0a74137d847c19a6f63b12e9;hb=HEAD#l127>
IF(MSVC_VERSION GREATER 1400)
128
<http://www.vtk.org/gitweb?p=VTK.git;a=blob;f=CMake/vtkDetermineCompilerFlags.cmake;h=1398050afb34ff8c0a74137d847c19a6f63b12e9;hb=HEAD#l128>
  SET(CMAKE_CXX_MP_FLAG OFF CACHE BOOL "Build with /MP flag enabled")
129
<http://www.vtk.org/gitweb?p=VTK.git;a=blob;f=CMake/vtkDetermineCompilerFlags.cmake;h=1398050afb34ff8c0a74137d847c19a6f63b12e9;hb=HEAD#l129>
  SET(PROCESSOR_COUNT "$ENV{NUMBER_OF_PROCESSORS}")
130
<http://www.vtk.org/gitweb?p=VTK.git;a=blob;f=CMake/vtkDetermineCompilerFlags.cmake;h=1398050afb34ff8c0a74137d847c19a6f63b12e9;hb=HEAD#l130>
  SET(CMAKE_CXX_MP_NUM_PROCESSORS CACHE ${PROCESSOR_COUNT} "The
maximum number of processes for the /MP flag")
131
<http://www.vtk.org/gitweb?p=VTK.git;a=blob;f=CMake/vtkDetermineCompilerFlags.cmake;h=1398050afb34ff8c0a74137d847c19a6f63b12e9;hb=HEAD#l131>
  IF (CMAKE_CXX_MP_FLAG)
132
<http://www.vtk.org/gitweb?p=VTK.git;a=blob;f=CMake/vtkDetermineCompilerFlags.cmake;h=1398050afb34ff8c0a74137d847c19a6f63b12e9;hb=HEAD#l132>
    SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /MP${CMAKE_CXX_MP_NUM_PROCESSORS}")
133
<http://www.vtk.org/gitweb?p=VTK.git;a=blob;f=CMake/vtkDetermineCompilerFlags.cmake;h=1398050afb34ff8c0a74137d847c19a6f63b12e9;hb=HEAD#l133>
    SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} /MP${CMAKE_CXX_MP_NUM_PROCESSORS}")
134
<http://www.vtk.org/gitweb?p=VTK.git;a=blob;f=CMake/vtkDetermineCompilerFlags.cmake;h=1398050afb34ff8c0a74137d847c19a6f63b12e9;hb=HEAD#l134>
  ENDIF ()
135
<http://www.vtk.org/gitweb?p=VTK.git;a=blob;f=CMake/vtkDetermineCompilerFlags.cmake;h=1398050afb34ff8c0a74137d847c19a6f63b12e9;hb=HEAD#l135>
ENDIF()

Hope that helps,
Cory

On Wed, Sep 16, 2015 at 11:44 AM, Petr Bena <benapetr at gmail.com> wrote:

> I know that I can pass -j parameter to GNU make as well as there is
> some sort of option to run MSVC compiler by hand and give that similar
> parameter, but that's not exactly what I want.
>
> I would prefer a way to get cmake to generate solution files for MSVC
> in a way that these options are enabled by default. Right now I need
> to do this by hand and when I run cmake again, it overwrites the
> solution files I modified and restore back the settings that disallow
> the multithreaded builds. Basically I would like to know if there is
> some option I would add to CMakeLists.txt that would make it do so. I
> understand that this may not possible with current version of CMake
> though.
>
> Thanks
>
> On Wed, Sep 16, 2015 at 5:28 PM, Bill Hoffman <bill.hoffman at kitware.com>
> wrote:
> > http://www.kitware.com/blog/home/post/434
> >
> > -Bill
> >
> >
> > --
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-- 
Cory Quammen
R&D Engineer
Kitware, Inc.
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