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CMake now uses C++17 if supported by the compiler

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We only set this when C++ version or requirement flag is not overridden
externally to be able to rely on CMake automatically downgrading the
standard version when the compiler doesn't support it.

CXX_STANDARD 17 also requires CMake 3.8 or later; on earlier versions we
use the old behavior and set C++11.
This commit is contained in:
Arseny Kapoulkine 2024-10-30 12:02:30 -07:00
parent ae163d5f06
commit 0f22f71f60
1 changed files with 6 additions and 4 deletions
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10
CMakeLists.txt
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@ -64,11 +64,13 @@ if (NOT DEFINED CMAKE_MSVC_RUNTIME_LIBRARY)
MultiThreaded$<$<CONFIG:Debug>:Debug>$<$<NOT:$<BOOL:${PUGIXML_STATIC_CRT}>>:DLL>)
endif()
if (NOT DEFINED CMAKE_CXX_STANDARD_REQUIRED)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
endif()
# Set the default C++ standard to C++17 if not set; CMake will automatically downgrade this if the compiler does not support it
# When CMAKE_CXX_STANDARD_REQUIRED is set, we fall back to C++11 to avoid breaking older compilers
if (NOT DEFINED CMAKE_CXX_STANDARD_REQUIRED AND NOT DEFINED CMAKE_CXX_STANDARD AND NOT CMAKE_VERSION VERSION_LESS 3.8)
if (NOT DEFINED CMAKE_CXX_STANDARD)
set(CMAKE_CXX_STANDARD 17)
set(CMAKE_CXX_STANDARD_REQUIRED OFF)
elseif (NOT DEFINED CMAKE_CXX_STANDARD)
set(CMAKE_CXX_STANDARD 11)
endif()