CMake: Enable VS parallel builds for a good reduction in compile times
This enables the /MP compiler flag, which parallelizes builds of by distributing compilation of individual object files across workes processes, instead of being limited to per-project parallelism. Reduces the time for a full compile from 72 s to 45 s on my machine.
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@ -17,6 +17,7 @@ else()
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# As far as I can tell, there's no way to override the CMake defaults while leaving user
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# As far as I can tell, there's no way to override the CMake defaults while leaving user
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# changes intact, so we'll just clobber everything and say sorry.
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# changes intact, so we'll just clobber everything and say sorry.
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message(STATUS "Cache compiler flags ignored, please edit CMakeFiles.txt to change the flags.")
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message(STATUS "Cache compiler flags ignored, please edit CMakeFiles.txt to change the flags.")
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# /MP - Multi-threaded compilation
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# /MD - Multi-threaded runtime
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# /MD - Multi-threaded runtime
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# /Ox - Full optimization
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# /Ox - Full optimization
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# /Oi - Use intrinsic functions
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# /Oi - Use intrinsic functions
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@ -24,7 +25,7 @@ else()
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# /GR- - Disable RTTI
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# /GR- - Disable RTTI
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# /GS- - No stack buffer overflow checks
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# /GS- - No stack buffer overflow checks
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# /EHsc - C++-only exception handling semantics
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# /EHsc - C++-only exception handling semantics
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set(optimization_flags "/MD /Ox /Oi /Oy- /DNDEBUG /GR- /GS- /EHsc")
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set(optimization_flags "/MP /MD /Ox /Oi /Oy- /DNDEBUG /GR- /GS- /EHsc")
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# /Zi - Output debugging information
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# /Zi - Output debugging information
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# /Zo - enahnced debug info for optimized builds
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# /Zo - enahnced debug info for optimized builds
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set(CMAKE_C_FLAGS_RELEASE "${optimization_flags} /Zi" CACHE STRING "" FORCE)
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set(CMAKE_C_FLAGS_RELEASE "${optimization_flags} /Zi" CACHE STRING "" FORCE)
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