cxx11: deprecate and use cxx-standard

cxx11.cmake

@@ -13,44 +13,16 @@
 # You should have received a copy of the GNU General Public License along with
 # this program.  If not, see <http://www.gnu.org/licenses/>.
 
-include(CheckCXXCompilerFlag)
-
-# .rst: .. ifmode:: user
-#
-# .. command:: CHECK_CXX11_SUPPORT
-#
-# Set ouput variable CXX11_SUPPORTED to TRUE if C++11 is supported by the
-# current compiler. Set to FALSE otherwise.
-#
-function(CHECK_CXX11_SUPPORT CXX11_SUPPORTED)
-  check_cxx_compiler_flag("-std=c++0x" COMPILER_SUPPORTS_CXX0X)
-  check_cxx_compiler_flag("-std=c++11" COMPILER_SUPPORTS_CXX11)
-
-  if(COMPILER_SUPPORTS_CXX0X OR COMPILER_SUPPORTS_CXX11)
-    set(${CXX11_SUPPORTED}
-        TRUE
-        PARENT_SCOPE)
-  else()
-    set(${CXX11_SUPPORTED}
-        FALSE
-        PARENT_SCOPE)
-  endif()
-endfunction(CHECK_CXX11_SUPPORT)
-
 # .rst: .. ifmode:: user
 #
 # .. command:: PROJECT_USE_CXX11
 #
-# This macro set up the project to compile the whole project with C++11
-# standards.
+# DEPRECATED. This macro set up the project to compile the whole project with
+# C++11 standards.
 #
 macro(PROJECT_USE_CXX11)
-  check_cxx_compiler_flag("-std=c++0x" COMPILER_SUPPORTS_CXX0X)
-  check_cxx_compiler_flag("-std=c++11" COMPILER_SUPPORTS_CXX11)
-  if(COMPILER_SUPPORTS_CXX0X OR COMPILER_SUPPORTS_CXX11)
-    set(CMAKE_CXX_STANDARD 11)
-    set(CXX_STANDARD_REQUIRED ON)
-  else()
-    message(STATUS "The compiler ${CMAKE_CXX_COMPILER} has no C++11 support.")
-  endif()
+  message(
+    DEPRECATION
+      "This macro is deprecated. Use CHECK_MINIMAL_CXX_STANDARD instead.")
+  check_minimal_cxx_standard(11 REQUIRED)
 endmacro(PROJECT_USE_CXX11)