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Update CMakeLists.txt

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This commit is contained in:
Sandu Liviu Catalin 2021-02-01 01:49:03 +02:00
parent 2a719c18c2
commit 8df5f03d7b
1 changed files with 74 additions and 69 deletions
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29
CMakeLists.txt
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@ -13,9 +13,16 @@ if(WIN32 AND MINGW)
option(COPY_DEPENDENCIES "Copy deppendent DLLs into the deps folder." OFF) option(COPY_DEPENDENCIES "Copy deppendent DLLs into the deps folder." OFF)
endif() endif()
# C++14 is mandatory
set(CPP_STD_NUMBER 14)
include(CheckCXXCompilerFlag) include(CheckCXXCompilerFlag)
# C++ standard availability check # C++ standard availability check
if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU") if(${CMAKE_CXX_COMPILER_ID} MATCHES "(GNU)+")
# Specific flags
set(CPP_STD_COMPILER_FLAG "-std=c++14")
# Don't even bother with previous version
if(CPP_STD_NUMBER LESS 20 AND NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 8.0)
check_cxx_compiler_flag(-std=c++20 HAVE_FLAG_STD_CXX20) check_cxx_compiler_flag(-std=c++20 HAVE_FLAG_STD_CXX20)
check_cxx_compiler_flag(-std=c++2a HAVE_FLAG_STD_CXX2A) check_cxx_compiler_flag(-std=c++2a HAVE_FLAG_STD_CXX2A)
if(HAVE_FLAG_STD_CXX20 OR HAVE_FLAG_STD_CXX2A) if(HAVE_FLAG_STD_CXX20 OR HAVE_FLAG_STD_CXX2A)
@ -23,9 +30,9 @@ if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
set(CPP_STD_NUMBER 20) set(CPP_STD_NUMBER 20)
# Specific flags # Specific flags
if (HAVE_FLAG_STD_CXX2A AND NOT HAVE_FLAG_STD_CXX20) if (HAVE_FLAG_STD_CXX2A AND NOT HAVE_FLAG_STD_CXX20)
set(CPP_STD_COMPILER_FLAG "-std=c++20")
else()
set(CPP_STD_COMPILER_FLAG "-std=c++2a") set(CPP_STD_COMPILER_FLAG "-std=c++2a")
else()
set(CPP_STD_COMPILER_FLAG "-std=c++20")
endif() endif()
# Need these workarounds for older CMake # Need these workarounds for older CMake
if(${CMAKE_VERSION} VERSION_LESS "3.8.0") if(${CMAKE_VERSION} VERSION_LESS "3.8.0")
@ -37,17 +44,20 @@ if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
set(CMAKE_CXX20_EXTENSION_COMPILE_OPTION "-std=gnu++2a") set(CMAKE_CXX20_EXTENSION_COMPILE_OPTION "-std=gnu++2a")
endif() endif()
endif() endif()
else() endif()
endif()
# Don't even bother with previous version
if(CPP_STD_NUMBER LESS 17 AND NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 7.0)
check_cxx_compiler_flag(-std=c++17 HAVE_FLAG_STD_CXX17) check_cxx_compiler_flag(-std=c++17 HAVE_FLAG_STD_CXX17)
check_cxx_compiler_flag(-std=c++1z HAVE_FLAG_STD_CXX1Z) check_cxx_compiler_flag(-std=c++1z HAVE_FLAG_STD_CXX1Z)
if(HAVE_FLAG_STD_CXX17 OR HAVE_FLAG_STD_CXX1Z) if(HAVE_FLAG_STD_CXX17 OR HAVE_FLAG_STD_CXX1Z)
# We can use C++17 # We can use C++17
set(CPP_STD_NUMBER 17) set(CPP_STD_NUMBER 17)
# Specific flags # Specific flags
if (HAVE_FLAG_STD_CXX17 AND NOT HAVE_FLAG_STD_CXX1Z) if (HAVE_FLAG_STD_CXX1Z AND NOT HAVE_FLAG_STD_CXX17)
set(CPP_STD_COMPILER_FLAG "-std=c++17")
else()
set(CPP_STD_COMPILER_FLAG "-std=c++1z") set(CPP_STD_COMPILER_FLAG "-std=c++1z")
else()
set(CPP_STD_COMPILER_FLAG "-std=c++17")
endif() endif()
# Need these workarounds for older CMake # Need these workarounds for older CMake
if(${CMAKE_VERSION} VERSION_LESS "3.8.0") if(${CMAKE_VERSION} VERSION_LESS "3.8.0")
@ -59,11 +69,6 @@ if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
set(CMAKE_CXX17_EXTENSION_COMPILE_OPTION "-std=gnu++1z") set(CMAKE_CXX17_EXTENSION_COMPILE_OPTION "-std=gnu++1z")
endif() endif()
endif() endif()
else()
# C++14 is mandatory
set(CPP_STD_NUMBER 14)
# Specific flags
set(CPP_STD_COMPILER_FLAG "-std=c++14")
endif() endif()
endif() endif()
else() else()