diff options
| -rw-r--r-- | CMakeLists.txt | 28 |
1 files changed, 12 insertions, 16 deletions
diff --git a/CMakeLists.txt b/CMakeLists.txt index 91ac63d5e50..c5992993f91 100644 --- a/CMakeLists.txt +++ b/CMakeLists.txt @@ -1705,22 +1705,18 @@ if(WITH_PYTHON) endif() endif() -if(MSVC) - string(APPEND CMAKE_CXX_FLAGS " /std:c++17") - # Make MSVC properly report the value of the __cplusplus preprocessor macro - # Available MSVC 15.7 (1914) and up, without this it reports 199711L regardless - # of the C++ standard chosen above - if(MSVC_VERSION GREATER 1913) - string(APPEND CMAKE_CXX_FLAGS " /Zc:__cplusplus") - endif() -elseif( - CMAKE_COMPILER_IS_GNUCC OR - CMAKE_C_COMPILER_ID MATCHES "Clang" OR - CMAKE_C_COMPILER_ID MATCHES "Intel" -) - string(APPEND CMAKE_CXX_FLAGS " -std=c++17") -else() - message(FATAL_ERROR "Unknown compiler ${CMAKE_C_COMPILER_ID}, can't enable C++17 build") +# Select C++17 as the standard for C++ projects. +set(CMAKE_CXX_STANDARD 17) +# If C++17 is not available, downgrading to an earlier standard is NOT OK. +set(CMAKE_CXX_STANDARD_REQUIRED ON) +# Do not enable compiler specific language extentions. +set(CMAKE_CXX_EXTENSIONS OFF) + +# Make MSVC properly report the value of the __cplusplus preprocessor macro +# Available MSVC 15.7 (1914) and up, without this it reports 199711L regardless +# of the C++ standard chosen above. +if(MSVC AND MSVC_VERSION GREATER 1913) + string(APPEND CMAKE_CXX_FLAGS " /Zc:__cplusplus") endif() # Visual Studio has all standards it supports available by default |