I was trying to get ExternalProjects generated with the Ninja generator to do a
better job of handling multiple CPUs and load, so I tried the naïve solution
below.
I needed to add flags to the program named in CMAKE_MAKE_PROGRAM. This is
difficult because CMAKE_MAKE_PROGRAM is a string; I can pass it as part of an
ExternalProjects’ CMAKE_ARGS, but then the resulting build tries to run
“/usr/bin/ninja –j 32” as the command, instead of adding –j 32 to ninja’s
command line.
Any ideas, or am I asking for a CMAKE_MAKE_PROGRAM_FLAGS command? Or to modify
the generator?
the only alternative is to explicitly set the BUILD_COMMAND for every
ExternalProject_add command.
#------------------------------
# For ninja generator, propagate ninja flags
#------------------------------
if(CMAKE_GENERATOR MATCHES ".*Ninja.*")
if(NOT DEFINED PROCESSOR_COUNT)
# Unknown:
set(PROCESSOR_COUNT 1)
# Linux:
if(CMAKE_SYSTEM_NAME MATCHES ".*Linux.*")
set(cpuinfo_file "/proc/cpuinfo")
if(EXISTS "${cpuinfo_file}")
file(STRINGS "${cpuinfo_file}" procs REGEX "^processor.: [0-9]+$")
list(LENGTH procs PROCESSOR_COUNT)
endif()
# Mac:
elseif(APPLE)
find_program(cmd_sys_pro "system_profiler")
if(cmd_sys_pro)
execute_process(COMMAND ${cmd_sys_pro} OUTPUT_VARIABLE info)
string(REGEX REPLACE "^.*Total Number Of Cores: ([0-9]+).*$" "\\1"
PROCESSOR_COUNT "${info}")
endif()
# Windows:
elseif(WIN32)
set(PROCESSOR_COUNT "$ENV{NUMBER_OF_PROCESSORS}")
endif()
endif()
set(CMAKE_MAKE_PROGRAM ${CMAKE_MAKE_PROGRAM} -l ${PROCESSOR_COUNT})
endif()
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