Squashed 'third_party/google-benchmark/' content from commit 785e2c3
Change-Id: Iaaca5eca89f717081452e643a233e86425b03e89
git-subtree-dir: third_party/google-benchmark
git-subtree-split: 785e2c3158589e8ef48c59ba80e48d76bdbd8902
diff --git a/cmake/AddCXXCompilerFlag.cmake b/cmake/AddCXXCompilerFlag.cmake
new file mode 100644
index 0000000..d0d2099
--- /dev/null
+++ b/cmake/AddCXXCompilerFlag.cmake
@@ -0,0 +1,74 @@
+# - Adds a compiler flag if it is supported by the compiler
+#
+# This function checks that the supplied compiler flag is supported and then
+# adds it to the corresponding compiler flags
+#
+# add_cxx_compiler_flag(<FLAG> [<VARIANT>])
+#
+# - Example
+#
+# include(AddCXXCompilerFlag)
+# add_cxx_compiler_flag(-Wall)
+# add_cxx_compiler_flag(-no-strict-aliasing RELEASE)
+# Requires CMake 2.6+
+
+if(__add_cxx_compiler_flag)
+ return()
+endif()
+set(__add_cxx_compiler_flag INCLUDED)
+
+include(CheckCXXCompilerFlag)
+
+function(mangle_compiler_flag FLAG OUTPUT)
+ string(TOUPPER "HAVE_CXX_FLAG_${FLAG}" SANITIZED_FLAG)
+ string(REPLACE "+" "X" SANITIZED_FLAG ${SANITIZED_FLAG})
+ string(REGEX REPLACE "[^A-Za-z_0-9]" "_" SANITIZED_FLAG ${SANITIZED_FLAG})
+ string(REGEX REPLACE "_+" "_" SANITIZED_FLAG ${SANITIZED_FLAG})
+ set(${OUTPUT} "${SANITIZED_FLAG}" PARENT_SCOPE)
+endfunction(mangle_compiler_flag)
+
+function(add_cxx_compiler_flag FLAG)
+ mangle_compiler_flag("${FLAG}" MANGLED_FLAG)
+ set(OLD_CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS}")
+ set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} ${FLAG}")
+ check_cxx_compiler_flag("${FLAG}" ${MANGLED_FLAG})
+ set(CMAKE_REQUIRED_FLAGS "${OLD_CMAKE_REQUIRED_FLAGS}")
+ if(${MANGLED_FLAG})
+ set(VARIANT ${ARGV1})
+ if(ARGV1)
+ string(TOUPPER "_${VARIANT}" VARIANT)
+ endif()
+ set(CMAKE_CXX_FLAGS${VARIANT} "${CMAKE_CXX_FLAGS${VARIANT}} ${BENCHMARK_CXX_FLAGS${VARIANT}} ${FLAG}" PARENT_SCOPE)
+ endif()
+endfunction()
+
+function(add_required_cxx_compiler_flag FLAG)
+ mangle_compiler_flag("${FLAG}" MANGLED_FLAG)
+ set(OLD_CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS}")
+ set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} ${FLAG}")
+ check_cxx_compiler_flag("${FLAG}" ${MANGLED_FLAG})
+ set(CMAKE_REQUIRED_FLAGS "${OLD_CMAKE_REQUIRED_FLAGS}")
+ if(${MANGLED_FLAG})
+ set(VARIANT ${ARGV1})
+ if(ARGV1)
+ string(TOUPPER "_${VARIANT}" VARIANT)
+ endif()
+ set(CMAKE_CXX_FLAGS${VARIANT} "${CMAKE_CXX_FLAGS${VARIANT}} ${FLAG}" PARENT_SCOPE)
+ set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${FLAG}" PARENT_SCOPE)
+ set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} ${FLAG}" PARENT_SCOPE)
+ set(CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER_FLAGS} ${FLAG}" PARENT_SCOPE)
+ set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} ${FLAG}" PARENT_SCOPE)
+ else()
+ message(FATAL_ERROR "Required flag '${FLAG}' is not supported by the compiler")
+ endif()
+endfunction()
+
+function(check_cxx_warning_flag FLAG)
+ mangle_compiler_flag("${FLAG}" MANGLED_FLAG)
+ set(OLD_CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS}")
+ # Add -Werror to ensure the compiler generates an error if the warning flag
+ # doesn't exist.
+ set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -Werror ${FLAG}")
+ check_cxx_compiler_flag("${FLAG}" ${MANGLED_FLAG})
+ set(CMAKE_REQUIRED_FLAGS "${OLD_CMAKE_REQUIRED_FLAGS}")
+endfunction()