From 8381bc12add724f1f262601b155485164b1842b1 Mon Sep 17 00:00:00 2001 From: Brad King Date: Wed, 11 Apr 2018 14:46:09 -0400 Subject: Clang: Avoid extra C++ feature detection when simulating MSVC Apply the optimization from commit v3.10.0-rc1~131^2 (MSVC: Avoid unnecessary C++ feature detection steps, 2017-09-11) to the case of Clang simulating a version of MSVC that does not define standards. Issue: #17274 --- Modules/Compiler/Clang-CXX.cmake | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/Modules/Compiler/Clang-CXX.cmake b/Modules/Compiler/Clang-CXX.cmake index c5dd081..b24aaf4 100644 --- a/Modules/Compiler/Clang-CXX.cmake +++ b/Modules/Compiler/Clang-CXX.cmake @@ -70,4 +70,19 @@ else() # 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 + cxx_std_20 + ) + _record_compiler_features(CXX "" CMAKE_CXX_COMPILE_FEATURES) + endmacro() endif() -- cgit v0.12