[ARM] Fix for MVE VPT block pass
[llvm-complete.git] / utils / benchmark / cmake / AddCXXCompilerFlag.cmake
blobd0d2099814402a3fc54ed2be2b61cd4f31d5c5f7
1 # - Adds a compiler flag if it is supported by the compiler
3 # This function checks that the supplied compiler flag is supported and then
4 # adds it to the corresponding compiler flags
6 #  add_cxx_compiler_flag(<FLAG> [<VARIANT>])
8 # - Example
10 # include(AddCXXCompilerFlag)
11 # add_cxx_compiler_flag(-Wall)
12 # add_cxx_compiler_flag(-no-strict-aliasing RELEASE)
13 # Requires CMake 2.6+
15 if(__add_cxx_compiler_flag)
16   return()
17 endif()
18 set(__add_cxx_compiler_flag INCLUDED)
20 include(CheckCXXCompilerFlag)
22 function(mangle_compiler_flag FLAG OUTPUT)
23   string(TOUPPER "HAVE_CXX_FLAG_${FLAG}" SANITIZED_FLAG)
24   string(REPLACE "+" "X" SANITIZED_FLAG ${SANITIZED_FLAG})
25   string(REGEX REPLACE "[^A-Za-z_0-9]" "_" SANITIZED_FLAG ${SANITIZED_FLAG})
26   string(REGEX REPLACE "_+" "_" SANITIZED_FLAG ${SANITIZED_FLAG})
27   set(${OUTPUT} "${SANITIZED_FLAG}" PARENT_SCOPE)
28 endfunction(mangle_compiler_flag)
30 function(add_cxx_compiler_flag FLAG)
31   mangle_compiler_flag("${FLAG}" MANGLED_FLAG)
32   set(OLD_CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS}")
33   set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} ${FLAG}")
34   check_cxx_compiler_flag("${FLAG}" ${MANGLED_FLAG})
35   set(CMAKE_REQUIRED_FLAGS "${OLD_CMAKE_REQUIRED_FLAGS}")
36   if(${MANGLED_FLAG})
37     set(VARIANT ${ARGV1})
38     if(ARGV1)
39       string(TOUPPER "_${VARIANT}" VARIANT)
40     endif()
41     set(CMAKE_CXX_FLAGS${VARIANT} "${CMAKE_CXX_FLAGS${VARIANT}} ${BENCHMARK_CXX_FLAGS${VARIANT}} ${FLAG}" PARENT_SCOPE)
42   endif()
43 endfunction()
45 function(add_required_cxx_compiler_flag FLAG)
46   mangle_compiler_flag("${FLAG}" MANGLED_FLAG)
47   set(OLD_CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS}")
48   set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} ${FLAG}")
49   check_cxx_compiler_flag("${FLAG}" ${MANGLED_FLAG})
50   set(CMAKE_REQUIRED_FLAGS "${OLD_CMAKE_REQUIRED_FLAGS}")
51   if(${MANGLED_FLAG})
52     set(VARIANT ${ARGV1})
53     if(ARGV1)
54       string(TOUPPER "_${VARIANT}" VARIANT)
55     endif()
56     set(CMAKE_CXX_FLAGS${VARIANT} "${CMAKE_CXX_FLAGS${VARIANT}} ${FLAG}" PARENT_SCOPE)
57     set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${FLAG}" PARENT_SCOPE)
58     set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} ${FLAG}" PARENT_SCOPE)
59     set(CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER_FLAGS} ${FLAG}" PARENT_SCOPE)
60     set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} ${FLAG}" PARENT_SCOPE)
61   else()
62     message(FATAL_ERROR "Required flag '${FLAG}' is not supported by the compiler")
63   endif()
64 endfunction()
66 function(check_cxx_warning_flag FLAG)
67   mangle_compiler_flag("${FLAG}" MANGLED_FLAG)
68   set(OLD_CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS}")
69   # Add -Werror to ensure the compiler generates an error if the warning flag
70   # doesn't exist.
71   set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -Werror ${FLAG}")
72   check_cxx_compiler_flag("${FLAG}" ${MANGLED_FLAG})
73   set(CMAKE_REQUIRED_FLAGS "${OLD_CMAKE_REQUIRED_FLAGS}")
74 endfunction()