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mdbx-cmake: fixes for old C/C++ compilers and/or CMake.

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This commit is contained in:
Leonid Yuriev
2020-06-26 02:57:46 +03:00
parent 505ee31635
commit 95199c754a
3 changed files with 97 additions and 30 deletions
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69
cmake/compiler.cmake
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@@ -254,6 +254,17 @@ else()
set(CMAKE_REQUIRED_FLAGS "")
endif()
# Crutch for old C++ compilers and/or CMake to enabling C++11
if(CMAKE_CXX_COMPILER_LOADED)
list(FIND CMAKE_CXX_COMPILE_FEATURES cxx_std_11 HAS_CXX11)
if(HAS_CXX11 LESS 0)
check_compiler_flag("-std=gnu++11" CXX_FALLBACK_STDGNU11)
if(NOT CXX_FALLBACK_STDGNU11)
check_compiler_flag("-std=c++11" CXX_FALLBACK_STD11)
endif()
endif()
endif()
# Check for LTO support by GCC
if(CMAKE_COMPILER_IS_GNU${CMAKE_PRIMARY_LANG})
unset(gcc_collect)
@@ -487,8 +498,12 @@ endif()
macro(setup_compile_flags)
# save initial C/CXX flags
if(NOT INITIAL_CMAKE_FLAGS_SAVED)
set(INITIAL_CMAKE_CXX_FLAGS ${CMAKE_CXX_FLAGS} CACHE STRING "Initial CMake's flags" FORCE)
set(INITIAL_CMAKE_C_FLAGS ${CMAKE_C_FLAGS} CACHE STRING "Initial CMake's flags" FORCE)
if(CMAKE_CXX_COMPILER_LOADED)
set(INITIAL_CMAKE_CXX_FLAGS ${CMAKE_CXX_FLAGS} CACHE STRING "Initial CMake's flags" FORCE)
endif()
if(CMAKE_C_COMPILER_LOADED)
set(INITIAL_CMAKE_C_FLAGS ${CMAKE_C_FLAGS} CACHE STRING "Initial CMake's flags" FORCE)
endif()
set(INITIAL_CMAKE_EXE_LINKER_FLAGS ${CMAKE_EXE_LINKER_FLAGS} CACHE STRING "Initial CMake's flags" FORCE)
set(INITIAL_CMAKE_SHARED_LINKER_FLAGS ${CMAKE_SHARED_LINKER_FLAGS} CACHE STRING "Initial CMake's flags" FORCE)
set(INITIAL_CMAKE_STATIC_LINKER_FLAGS ${CMAKE_STATIC_LINKER_FLAGS} CACHE STRING "Initial CMake's flags" FORCE)
@@ -497,8 +512,18 @@ macro(setup_compile_flags)
endif()
# reset C/CXX flags
set(CXX_FLAGS ${INITIAL_CMAKE_CXX_FLAGS})
set(C_FLAGS ${INITIAL_CMAKE_C_FLAGS})
if(CMAKE_CXX_COMPILER_LOADED)
set(CXX_FLAGS ${INITIAL_CMAKE_CXX_FLAGS})
# Crutch for old C++ compilers and/or CMake to enabling C++11
if(CXX_FALLBACK_STDGNU11)
add_compile_flags("CXX" "-std=gnu++11")
elseif(CXX_FALLBACK_STD11)
add_compile_flags("CXX" "-std=c++11")
endif()
endif()
if(CMAKE_C_COMPILER_LOADED)
set(C_FLAGS ${INITIAL_CMAKE_C_FLAGS})
endif()
set(EXE_LINKER_FLAGS ${INITIAL_CMAKE_EXE_LINKER_FLAGS})
set(SHARED_LINKER_FLAGS ${INITIAL_CMAKE_SHARED_LINKER_FLAGS})
set(STATIC_LINKER_FLAGS ${INITIAL_CMAKE_STATIC_LINKER_FLAGS})
@@ -721,31 +746,37 @@ macro(setup_compile_flags)
endif()
# push C/CXX flags into the cache
set(CMAKE_CXX_FLAGS ${CXX_FLAGS} CACHE STRING "Flags used by the C++ compiler during all build types" FORCE)
set(CMAKE_C_FLAGS ${C_FLAGS} CACHE STRING "Flags used by the C compiler during all build types" FORCE)
if(CMAKE_CXX_COMPILER_LOADED)
set(CMAKE_CXX_FLAGS ${CXX_FLAGS} CACHE STRING "Flags used by the C++ compiler during all build types" FORCE)
unset(CXX_FLAGS)
endif()
if(CMAKE_C_COMPILER_LOADED)
set(CMAKE_C_FLAGS ${C_FLAGS} CACHE STRING "Flags used by the C compiler during all build types" FORCE)
unset(C_FLAGS)
endif()
set(CMAKE_EXE_LINKER_FLAGS ${EXE_LINKER_FLAGS} CACHE STRING "Flags used by the linker" FORCE)
set(CMAKE_SHARED_LINKER_FLAGS ${SHARED_LINKER_FLAGS} CACHE STRING "Flags used by the linker during the creation of dll's" FORCE)
set(CMAKE_STATIC_LINKER_FLAGS ${STATIC_LINKER_FLAGS} CACHE STRING "Flags used by the linker during the creation of static libraries" FORCE)
set(CMAKE_MODULE_LINKER_FLAGS ${MODULE_LINKER_FLAGS} CACHE STRING "Flags used by the linker during the creation of modules" FORCE)
unset(CXX_FLAGS)
unset(C_FLAGS)
unset(EXE_LINKER_FLAGS)
unset(SHARED_LINKER_FLAGS)
unset(STATIC_LINKER_FLAGS)
unset(MODULE_LINKER_FLAGS)
endmacro(setup_compile_flags)
# determine library for for std::filesystem
set(LIBCXX_FILESYSTEM "")
if(CMAKE_COMPILER_IS_GNUCXX)
if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS 9.0)
set(LIBCXX_FILESYSTEM "stdc++fs")
endif()
elseif(CMAKE_COMPILER_IS_CLANG)
if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS 5.0)
set(LIBCXX_FILESYSTEM "c++experimental")
else()
set(LIBCXX_FILESYSTEM "stdc++fs")
if(CMAKE_CXX_COMPILER_LOADED)
# determine library for for std::filesystem
set(LIBCXX_FILESYSTEM "")
if(CMAKE_COMPILER_IS_GNUCXX)
if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS 9.0)
set(LIBCXX_FILESYSTEM "stdc++fs")
endif()
elseif(CMAKE_COMPILER_IS_CLANG)
if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS 5.0)
set(LIBCXX_FILESYSTEM "c++experimental")
else()
set(LIBCXX_FILESYSTEM "stdc++fs")
endif()
endif()
endif()