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| author | David 'Digit' Turner <digit@google.com> | 2023-04-19 18:57:11 +0200 |
|---|---|---|
| committer | David 'Digit' Turner <digit+github@google.com> | 2023-04-21 19:31:18 +0200 |
| commit | 63415a419815d844149557aa16fa8a0f72b0c7e6 (patch) | |
| tree | 2f6c9828e6938af8f4ba587a72582733cb7c74ee | |
| parent | c266b21674171dfb39d10872bec6ac493665cc5d (diff) | |
| download | ninja-63415a419815d844149557aa16fa8a0f72b0c7e6.tar.gz | |
Enable ppoll() usage when available.
This patch modifies the CMakeLists.txt file to probe for
ppoll() on the target system, and define -DUSE_PPOLL=1 if
it is available.
This can be disabled by setting -DNINJA_FORCE_PSELECT=ON
when invoking CMake.
This matches the default behavior of the configure.py
script (and its `--force-pselect` option). Note that
there is no noticeable performance difference before
build commands are launched, so this
change is very hard to benchmark properly.
Fix for https://github.com/ninja-build/ninja/issues/1821
| -rw-r--r-- | CMakeLists.txt | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/CMakeLists.txt b/CMakeLists.txt index 98f7948..fd32ab1 100644 --- a/CMakeLists.txt +++ b/CMakeLists.txt @@ -4,6 +4,7 @@ include(CheckSymbolExists) include(CheckIPOSupported) option(NINJA_BUILD_BINARY "Build ninja binary" ON) +option(NINJA_FORCE_PSELECT "Use pselect() even on platforms that provide ppoll()" OFF) project(ninja CXX) @@ -35,6 +36,16 @@ else() if(flag_color_diag) add_compile_options(-fdiagnostics-color) endif() + + if(NOT NINJA_FORCE_PSELECT) + # Check whether ppoll() is usable on the target platform. + # Set -DUSE_PPOLL=1 if this is the case. + include(CheckSymbolExists) + check_symbol_exists(ppoll poll.h HAVE_PPOLL) + if(HAVE_PPOLL) + add_compile_definitions(USE_PPOLL=1) + endif() + endif() endif() # --- optional re2c |