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/CXXFeatureCheck.cmake b/cmake/CXXFeatureCheck.cmake
new file mode 100644
index 0000000..99b56dd
--- /dev/null
+++ b/cmake/CXXFeatureCheck.cmake
@@ -0,0 +1,64 @@
+# - Compile and run code to check for C++ features
+#
+# This functions compiles a source file under the `cmake` folder
+# and adds the corresponding `HAVE_[FILENAME]` flag to the CMake
+# environment
+#
+# cxx_feature_check(<FLAG> [<VARIANT>])
+#
+# - Example
+#
+# include(CXXFeatureCheck)
+# cxx_feature_check(STD_REGEX)
+# Requires CMake 2.8.12+
+
+if(__cxx_feature_check)
+ return()
+endif()
+set(__cxx_feature_check INCLUDED)
+
+function(cxx_feature_check FILE)
+ string(TOLOWER ${FILE} FILE)
+ string(TOUPPER ${FILE} VAR)
+ string(TOUPPER "HAVE_${VAR}" FEATURE)
+ if (DEFINED HAVE_${VAR})
+ set(HAVE_${VAR} 1 PARENT_SCOPE)
+ add_definitions(-DHAVE_${VAR})
+ return()
+ endif()
+
+ if (NOT DEFINED COMPILE_${FEATURE})
+ message(STATUS "Performing Test ${FEATURE}")
+ if(CMAKE_CROSSCOMPILING)
+ try_compile(COMPILE_${FEATURE}
+ ${CMAKE_BINARY_DIR} ${CMAKE_CURRENT_SOURCE_DIR}/cmake/${FILE}.cpp
+ CMAKE_FLAGS ${BENCHMARK_CXX_LINKER_FLAGS}
+ LINK_LIBRARIES ${BENCHMARK_CXX_LIBRARIES})
+ if(COMPILE_${FEATURE})
+ message(WARNING
+ "If you see build failures due to cross compilation, try setting HAVE_${VAR} to 0")
+ set(RUN_${FEATURE} 0)
+ else()
+ set(RUN_${FEATURE} 1)
+ endif()
+ else()
+ message(STATUS "Performing Test ${FEATURE}")
+ try_run(RUN_${FEATURE} COMPILE_${FEATURE}
+ ${CMAKE_BINARY_DIR} ${CMAKE_CURRENT_SOURCE_DIR}/cmake/${FILE}.cpp
+ CMAKE_FLAGS ${BENCHMARK_CXX_LINKER_FLAGS}
+ LINK_LIBRARIES ${BENCHMARK_CXX_LIBRARIES})
+ endif()
+ endif()
+
+ if(RUN_${FEATURE} EQUAL 0)
+ message(STATUS "Performing Test ${FEATURE} -- success")
+ set(HAVE_${VAR} 1 PARENT_SCOPE)
+ add_definitions(-DHAVE_${VAR})
+ else()
+ if(NOT COMPILE_${FEATURE})
+ message(STATUS "Performing Test ${FEATURE} -- failed to compile")
+ else()
+ message(STATUS "Performing Test ${FEATURE} -- compiled but failed to run")
+ endif()
+ endif()
+endfunction()