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Fix C++ standard version for LLVM subproject

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This commit is contained in:
Denis Glazachev 2021-03-29 17:09:50 +04:00
parent 3e68d14ed1
commit 9ab41fe4c4
1 changed files with 13 additions and 8 deletions
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21
contrib/CMakeLists.txt vendored
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@ -215,15 +215,17 @@ if (USE_EMBEDDED_COMPILER AND USE_INTERNAL_LLVM_LIBRARY)
set (LLVM_ENABLE_RTTI 1 CACHE INTERNAL "")
set (LLVM_ENABLE_PIC 0 CACHE INTERNAL "")
set (LLVM_TARGETS_TO_BUILD "X86;AArch64" CACHE STRING "")
# Yes it is set globally, but this is not enough, since llvm will add -std=c++11 after default
# And c++2a cannot be used, due to ambiguous operator !=
if (COMPILER_GCC OR COMPILER_CLANG)
set (_CXX_STANDARD "gnu++17")
else()
set (_CXX_STANDARD "c++17")
endif()
set (LLVM_CXX_STD ${_CXX_STANDARD} CACHE STRING "" FORCE)
# Need to use C++17 since the compilation is not possible with C++20 currently, due to ambiguous operator != etc.
# LLVM project will set its default value for the -std=... but our global setting from CMake will override it.
set (CMAKE_CXX_STANDARD_bak ${CMAKE_CXX_STANDARD})
set (CMAKE_CXX_STANDARD 17)
add_subdirectory (llvm/llvm)
set (CMAKE_CXX_STANDARD ${CMAKE_CXX_STANDARD_bak})
unset (CMAKE_CXX_STANDARD_bak)
target_include_directories(LLVMSupport SYSTEM BEFORE PRIVATE ${ZLIB_INCLUDE_DIR})
endif ()
@ -280,9 +282,12 @@ if (USE_AMQPCPP)
add_subdirectory (amqpcpp-cmake)
endif()
if (USE_CASSANDRA)
# Need to use C++17 since the compilation is not possible with C++20 currently.
set (CMAKE_CXX_STANDARD_bak ${CMAKE_CXX_STANDARD})
set (CMAKE_CXX_STANDARD 17)
add_subdirectory (cassandra)
set (CMAKE_CXX_STANDARD ${CMAKE_CXX_STANDARD_bak})
unset (CMAKE_CXX_STANDARD_bak)
endif()