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| author | Brad King <brad.king@kitware.com> | 2017-09-11 14:55:36 -0400 |
|---|---|---|
| committer | Brad King <brad.king@kitware.com> | 2017-09-12 09:13:44 -0400 |
| commit | 39be8a9d191410ad7dfe4ec033d7e91f55a71cf6 (patch) | |
| tree | 2092bed8196d633b4f67ba53d6378f71b1bea0c4 /Modules/Compiler/MSVC-CXX.cmake | |
| parent | bf19bb5609b409c9c4043b22a7bbdb38354af73a (diff) | |
| download | cmake-39be8a9d191410ad7dfe4ec033d7e91f55a71cf6.tar.gz | |
MSVC: Avoid unnecessary C++ feature detection steps
Since commit v3.9.0-rc1~17^2~4 (Compilers: Port to use default
cmake_record_lang_compile_features macros, 2017-05-10) we run full
per-language-standard feature detection for MSVC. This is not necessary
because the base mode for MSVC has all features we define except for the
meta-features for C++14 and above. Override the default C++ feature
detection macro for MSVC to run detection only once as before.
Fixes: #17274
Diffstat (limited to 'Modules/Compiler/MSVC-CXX.cmake')
| -rw-r--r-- | Modules/Compiler/MSVC-CXX.cmake | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/Modules/Compiler/MSVC-CXX.cmake b/Modules/Compiler/MSVC-CXX.cmake index 3a63e3fa9f..789fff53b9 100644 --- a/Modules/Compiler/MSVC-CXX.cmake +++ b/Modules/Compiler/MSVC-CXX.cmake @@ -24,6 +24,16 @@ if ((CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL 19.0.24215.1 AND endif() __compiler_check_default_language_standard(CXX 19.0 14) + + # All features that we define are available in the base mode, except + # for meta-features for C++14 and above. Override the default macro + # to avoid doing unnecessary work. + macro(cmake_record_cxx_compile_features) + list(APPEND CMAKE_CXX17_COMPILE_FEATURES cxx_std_17) + list(APPEND CMAKE_CXX14_COMPILE_FEATURES cxx_std_14) + list(APPEND CMAKE_CXX98_COMPILE_FEATURES cxx_std_11) # no flag needed for 11 + _record_compiler_features_cxx(98) + endmacro() elseif (CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL 16.0) # MSVC has no specific options to set language standards, but set them as # empty strings anyways so the feature test infrastructure can at least check @@ -39,4 +49,18 @@ elseif (CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL 16.0) # There is no meaningful default for this set(CMAKE_CXX_STANDARD_DEFAULT "") + + # There are no compiler modes so we only need to test features once. + # Override the default macro for this special case. Pretend that + # all language standards are available so that at least compilation + # can be attempted. + macro(cmake_record_cxx_compile_features) + list(APPEND CMAKE_CXX_COMPILE_FEATURES + cxx_std_98 + cxx_std_11 + cxx_std_14 + cxx_std_17 + ) + _record_compiler_features(CXX "" CMAKE_CXX_COMPILE_FEATURES) + endmacro() endif() |