I'd like to use parallel make to build libraries like ITK and VTK
which are rather time-consuming.
This simple-minded (and non portable) method works: In the
ExternalProject_Add macro, add
BUILD_COMMAND ${CMAKE_MAKE_PROGRAM} -j4
But that only works if CMAKE_MAKE_PROGRAM understands the '-j4' flag.
I can test the generator, i.e.
if("${CMAKE_GENERATOR}" STREQUAL "Unix Makefiles")
set(BUILD_COMMAND_STRING "${CMAKE_PROGRAM} -j4")
endif
and later use in the ExternalProjectAdd
BUILD_COMMAND ${BUILD_COMMAND_STRING}
But if the generator is not "Unix Makefiles" this will expand to the
empty string, with the result of suppressing builds from ever
happening.
The only solution I can imagine is to have 2 ExternalProject_Add
macros inside a conditional
if("${CMAKE_GENERATOR}" STREQUAL "Unix Makefiles")
ExternalProjectAdd(
BUILD_COMMAND ${CMAKE_MAKE_PROGRAM} -j4
)
else()
ExternalProjectAdd(
# let the build command be the default for this generator
)
endif()
Anyone have a better idea?
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