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Lower requirements for gcc and clang #1693

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Lower requirements for gcc and clang #1693

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38 changes: 31 additions & 7 deletions CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -4,7 +4,13 @@ project(QLever C CXX)
# C/C++ Versions
set(CMAKE_C_STANDARD 11)
set(CMAKE_C_STANDARD_REQUIRED ON)
set(CMAKE_CXX_STANDARD 20)

if (${USE_CPP_17_BACKPORTS})
set(CMAKE_CXX_STANDARD 17)
else()
set(CMAKE_CXX_STANDARD 20)
endif()

set(CMAKE_CXX_STANDARD_REQUIRED ON)

if (CMAKE_INSTALL_PREFIX_INITIALIZED_TO_DEFAULT)
Expand All @@ -25,15 +31,33 @@ add_definitions("-DBOOST_ASIO_DISABLE_AWAITABLE_FRAME_RECYCLING")
# Coroutines require an additional compiler flag that is called differently
# on clang and g++
if (CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
if (CMAKE_CXX_COMPILER_VERSION VERSION_LESS "11.0.0")
MESSAGE(FATAL_ERROR "G++ versions older than 11.0 are not supported by QLever")

set(GCC_REQUIRED_VERSION "11.0.0")

if (${USE_CPP_17_BACKPORTS})
set(GCC_REQUIRED_VERSION "9.4.0")
endif ()


if (CMAKE_CXX_COMPILER_VERSION VERSION_LESS ${GCC_REQUIRED_VERSION})
MESSAGE(FATAL_ERROR "G++ version ${CMAKE_CXX_COMPILER_VERSION} older than ${GCC_REQUIRED_VERSION} is not supported by QLever")
else ()
add_compile_options(-fcoroutines)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -MD -MF")

if (${USE_CPP_17_BACKPORTS})
add_compile_options(-fconcepts) # this is needed to get templated lambdas and auto parameters
endif()
endif ()

elseif (CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
if (CMAKE_CXX_COMPILER_VERSION VERSION_LESS "16.0.0")
MESSAGE(FATAL_ERROR "Clang++ versions older than 16.0 are not supported by QLever")
elseif (CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
set(CLANG_REQUIRED_VERSION "16.0.0")

if (${USE_CPP_17_BACKPORTS})
set(GCC_REQUIRED_VERSION "15.0.0")
endif ()

if (CMAKE_CXX_COMPILER_VERSION VERSION_LESS ${CLANG_REQUIRED_VERSION})
MESSAGE(FATAL_ERROR "Clang++ version ${CMAKE_CXX_COMPILER_VERSION} older than ${CLANG_REQUIRED_VERSION} is not supported by QLever")
endif ()
else ()
MESSAGE(FATAL_ERROR "QLever currently only supports the G++ or LLVM-Clang++ compilers. Found ${CMAKE_CXX_COMPILER_ID}")
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