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| author | Robert Dailey <rcdailey@gmail.com> | 2018-01-29 11:34:28 -0600 |
|---|---|---|
| committer | Robert Dailey <rcdailey@gmail.com> | 2018-02-15 10:45:37 -0600 |
| commit | a1dee224b8f92a16a84ac285620136d04adb880a (patch) | |
| tree | 2207f860ef9062a3cf79683537f5225ea008ecee /CompileFlags.cmake | |
| parent | a2ec98b7d97df67d50e90e790b2bd235f7c278cc (diff) | |
| download | cmake-a1dee224b8f92a16a84ac285620136d04adb880a.tar.gz | |
CMake: Enable /MP for MSVC toolchain
A new cache option named `CMake_MSVC_PARALLEL` is now available that can
be used to control the usage of [`/MP`][1] to the MSVC compiler. This
enables parallelized builds on a per-translation unit basis. To enable
`/MP`, specify value `ON` to the option. Using an integral non-zero
value will control the specific number of threads used with the `/MP`
option, as opposed to letting the toolchain decide for you.
Fixes #17696
[1]: https://docs.microsoft.com/en-us/cpp/build/reference/mp-build-with-multiple-processes
Diffstat (limited to 'CompileFlags.cmake')
| -rw-r--r-- | CompileFlags.cmake | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/CompileFlags.cmake b/CompileFlags.cmake index 32e7005b5d..ec9b31bd91 100644 --- a/CompileFlags.cmake +++ b/CompileFlags.cmake @@ -82,3 +82,26 @@ endif () if (CMAKE_ANSI_CFLAGS) set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${CMAKE_ANSI_CFLAGS}") endif () + +# Allow per-translation-unit parallel builds when using MSVC +if(CMAKE_GENERATOR MATCHES "Visual Studio" AND + (CMAKE_C_COMPILER_ID MATCHES "MSVC|Intel" OR + CMAKE_CXX_COMPILER_ID MATCHES "MSVC|Intel")) + + set(CMake_MSVC_PARALLEL ON CACHE STRING "\ +Enables /MP flag for parallel builds using MSVC. Specify an \ +integer value to control the number of threads used (Only \ +works on some older versions of Visual Studio). Setting to \ +ON lets the toolchain decide how many threads to use. Set to \ +OFF to disable /MP completely." ) + + if(CMake_MSVC_PARALLEL) + if(CMake_MSVC_PARALLEL GREATER 0) + string(APPEND CMAKE_C_FLAGS " /MP${CMake_MSVC_PARALLEL}") + string(APPEND CMAKE_CXX_FLAGS " /MP${CMake_MSVC_PARALLEL}") + else() + string(APPEND CMAKE_C_FLAGS " /MP") + string(APPEND CMAKE_CXX_FLAGS " /MP") + endif() + endif() +endif() |