Ensure all informational cmake messages have STATUS type

CMakeLists.txt

@@ -79,7 +79,7 @@ get_git_version(GIT_VERSION)
 
 # Tell the user what versions we are using
 string(REGEX MATCH "[0-9]+\\.[0-9]+\\.[0-9]+" VERSION ${GIT_VERSION})
-message("-- Version: ${VERSION}")
+message(STATUS "Version: ${VERSION}")
 
 # The version of the libraries
 set(GENERIC_LIB_VERSION ${VERSION})
@@ -224,7 +224,7 @@ if (BENCHMARK_USE_LIBCXX)
   elseif ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU" OR
           "${CMAKE_CXX_COMPILER_ID}" STREQUAL "Intel")
     add_cxx_compiler_flag(-nostdinc++)
-    message("libc++ header path must be manually specified using CMAKE_CXX_FLAGS")
+    message(WARNING "libc++ header path must be manually specified using CMAKE_CXX_FLAGS")
     # Adding -nodefaultlibs directly to CMAKE_<TYPE>_LINKER_FLAGS will break
     # configuration checks such as 'find_package(Threads)'
     list(APPEND BENCHMARK_CXX_LINKER_FLAGS -nodefaultlibs)

cmake/CXXFeatureCheck.cmake

@@ -28,7 +28,7 @@ function(cxx_feature_check FILE)
   endif()
 
   if (NOT DEFINED COMPILE_${FEATURE})
-    message("-- Performing Test ${FEATURE}")
+    message(STATUS "Performing Test ${FEATURE}")
     if(CMAKE_CROSSCOMPILING)
       try_compile(COMPILE_${FEATURE}
               ${CMAKE_BINARY_DIR} ${CMAKE_CURRENT_SOURCE_DIR}/cmake/${FILE}.cpp
@@ -42,7 +42,7 @@ function(cxx_feature_check FILE)
         set(RUN_${FEATURE} 1)
       endif()
     else()
-      message("-- Performing Test ${FEATURE}")
+      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}
@@ -51,14 +51,14 @@ function(cxx_feature_check FILE)
   endif()
 
   if(RUN_${FEATURE} EQUAL 0)
-    message("-- Performing Test ${FEATURE} -- success")
+    message(STATUS "Performing Test ${FEATURE} -- success")
     set(HAVE_${VAR} 1 PARENT_SCOPE)
     add_definitions(-DHAVE_${VAR})
   else()
     if(NOT COMPILE_${FEATURE})
-      message("-- Performing Test ${FEATURE} -- failed to compile")
+      message(STATUS "Performing Test ${FEATURE} -- failed to compile")
     else()
-      message("-- Performing Test ${FEATURE} -- compiled but failed to run")
+      message(STATUS "Performing Test ${FEATURE} -- compiled but failed to run")
     endif()
   endif()
 endfunction()

cmake/GetGitVersion.cmake

@@ -49,6 +49,6 @@ function(get_git_version var)
       set(GIT_VERSION "v0.0.0")
   endif()
 
-  message("-- git Version: ${GIT_VERSION}")
+  message(STATUS "git Version: ${GIT_VERSION}")
   set(${var} ${GIT_VERSION} PARENT_SCOPE)
 endfunction()