Reapply working parts of CMake cleanup.
This patch adds the working parts of r243503. The difference with this patch
is that it doesn't include the HandleLLVMOptions.cmake file.
llvm-svn: 243698
Cr-Mirrored-From: sso://chromium.googlesource.com/_direct/external/github.com/llvm/llvm-project
Cr-Mirrored-Commit: 10ed6c361c1c0da0dcdae7366b9fb1809eb744f0
diff --git a/cmake/Modules/HandleLibcxxFlags.cmake b/cmake/Modules/HandleLibcxxFlags.cmake
new file mode 100644
index 0000000..2a450da
--- /dev/null
+++ b/cmake/Modules/HandleLibcxxFlags.cmake
@@ -0,0 +1,147 @@
+# HandleLibcxxFlags - A set of macros used to setup the flags used to compile
+# and link libc++. These macros add flags to the following CMake variables.
+# - LIBCXX_COMPILE_FLAGS: flags used to compile libc++
+# - LIBCXX_LINK_FLAGS: flags used to link libc++
+# - LIBCXX_LIBRARIES: libraries to link libc++ to.
+
+include(CheckCXXCompilerFlag)
+
+unset(add_flag_if_supported)
+
+# Mangle the name of a compiler flag into a valid CMake identifier.
+# Ex: --std=c++11 -> STD_EQ_CXX11
+macro(mangle_name str output)
+ string(STRIP "${str}" strippedStr)
+ string(REGEX REPLACE "^/" "" strippedStr "${strippedStr}")
+ string(REGEX REPLACE "^-+" "" strippedStr "${strippedStr}")
+ string(REGEX REPLACE "-+$" "" strippedStr "${strippedStr}")
+ string(REPLACE "-" "_" strippedStr "${strippedStr}")
+ string(REPLACE "=" "_EQ_" strippedStr "${strippedStr}")
+ string(REPLACE "+" "X" strippedStr "${strippedStr}")
+ string(TOUPPER "${strippedStr}" ${output})
+endmacro()
+
+# Remove a list of flags from all CMake variables that affect compile flags.
+# This can be used to remove unwanted flags specified on the command line
+# or added in other parts of LLVM's cmake configuration.
+macro(remove_flags)
+ foreach(var ${ARGN})
+ string(REPLACE "${var}" "" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
+ string(REPLACE "${var}" "" CMAKE_C_FLAGS "${CMAKE_C_FLAGS}")
+ string(REPLACE "${var}" "" CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS}")
+ string(REPLACE "${var}" "" CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS}")
+ string(REPLACE "${var}" "" CMAKE_SHARED_MODULE_FLAGS "${CMAKE_SHARED_MODULE_FLAGS}")
+ remove_definitions(${var})
+ endforeach()
+endmacro(remove_flags)
+
+# Add a macro definition if condition is true.
+macro(define_if condition def)
+ if (${condition})
+ add_definitions(${def})
+ endif()
+endmacro()
+
+# Add a macro definition if condition is not true.
+macro(define_if_not condition def)
+ if (NOT ${condition})
+ add_definitions(${def})
+ endif()
+endmacro()
+
+# Add a specified list of flags to both 'LIBCXX_COMPILE_FLAGS' and
+# 'LIBCXX_LINK_FLAGS'.
+macro(add_flags)
+ foreach(value ${ARGN})
+ list(APPEND LIBCXX_COMPILE_FLAGS ${value})
+ list(APPEND LIBCXX_LINK_FLAGS ${value})
+ endforeach()
+endmacro()
+
+# If the specified 'condition' is true then add a list of flags to both
+# 'LIBCXX_COMPILE_FLAGS' and 'LIBCXX_LINK_FLAGS'.
+macro(add_flags_if condition)
+ if (${condition})
+ add_flags(${ARGN})
+ endif()
+endmacro()
+
+# Add each flag in the list to LIBCXX_COMPILE_FLAGS and LIBCXX_LINK_FLAGS
+# if that flag is supported by the current compiler.
+macro(add_flags_if_supported)
+ foreach(flag ${ARGN})
+ mangle_name("${flag}" flagname)
+ check_cxx_compiler_flag("${flag}" "LIBCXX_SUPPORTS_${flagname}_FLAG")
+ add_flags_if(LIBCXX_SUPPORTS_${flagname}_FLAG ${flag})
+ endforeach()
+endmacro()
+
+# Add a list of flags to 'LIBCXX_COMPILE_FLAGS'.
+macro(add_compile_flags)
+ foreach(f ${ARGN})
+ list(APPEND LIBCXX_COMPILE_FLAGS ${f})
+ endforeach()
+endmacro()
+
+# If 'condition' is true then add the specified list of flags to
+# 'LIBCXX_COMPILE_FLAGS'
+macro(add_compile_flags_if condition)
+ if (${condition})
+ add_compile_flags(${ARGN})
+ endif()
+endmacro()
+
+# For each specified flag, add that flag to 'LIBCXX_COMPILE_FLAGS' if the
+# flag is supported by the C++ compiler.
+macro(add_compile_flags_if_supported)
+ foreach(flag ${ARGN})
+ mangle_name("${flag}" flagname)
+ check_cxx_compiler_flag("-Werror ${flag}" "LIBCXX_SUPPORTS_${flagname}_FLAG")
+ add_compile_flags_if(LIBCXX_SUPPORTS_${flagname}_FLAG ${flag})
+ endforeach()
+endmacro()
+
+# Add a list of flags to 'LIBCXX_LINK_FLAGS'.
+macro(add_link_flags)
+ foreach(f ${ARGN})
+ list(APPEND LIBCXX_LINK_FLAGS ${f})
+ endforeach()
+endmacro()
+
+# If 'condition' is true then add the specified list of flags to
+# 'LIBCXX_LINK_FLAGS'
+macro(add_link_flags_if condition)
+ if (${condition})
+ add_link_flags(${ARGN})
+ endif()
+endmacro()
+
+# For each specified flag, add that flag to 'LIBCXX_LINK_FLAGS' if the
+# flag is supported by the C++ compiler.
+macro(add_link_flags_if_supported)
+ foreach(flag ${ARGN})
+ mangle_name("${flag}" flagname)
+ check_cxx_compiler_flag("${flag}" "LIBCXX_SUPPORTS_${flagname}_FLAG")
+ add_link_flags_if(LIBCXX_SUPPORTS_${flagname}_FLAG ${flag})
+ endforeach()
+endmacro()
+
+# Add a list of libraries or link flags to 'LIBCXX_LIBRARIES'.
+macro(add_library_flags)
+ foreach(lib ${ARGN})
+ list(APPEND LIBCXX_LIBRARIES ${lib})
+ endforeach()
+endmacro()
+
+# if 'condition' is true then add the specified list of libraries and flags
+# to 'LIBCXX_LIBRARIES'.
+macro(add_library_flags_if condition)
+ if(${condition})
+ add_library_flags(${ARGN})
+ endif()
+endmacro()
+
+# Turn a comma separated CMake list into a space separated string.
+macro(split_list listname)
+ string(REPLACE ";" " " ${listname} "${${listname}}")
+endmacro()