cmake: Fix detecting -Wformat-* warnings for gcc

gcc expects -Wformat to be set along with these type of warnings.

Signed-off-by: Ralf Habacker <ralf.habacker@freenet.de>

diff --git a/cmake/modules/Macros.cmake b/cmake/modules/Macros.cmake
index 04ee287d3671afac3ec7ec0803539f4b444c8a9f..c3c057e6f48a89361abcda48763ab00130e8ae8c 100644 (file)
--- a/cmake/modules/Macros.cmake
+++ b/cmake/modules/Macros.cmake
@@ -126,6 +126,9 @@ function(check_compiler_warning_flag _flag _result _cxx)
     string(MAKE_C_IDENTIFIER "${_flag}" _varname)
     # required to get errors
     list(APPEND _flag -Werror)
+    if(_flag MATCHES "-Wformat-.*")
+        list(APPEND _flag -Wformat)
+    endif()
     if (_cxx)
         check_cxx_compiler_flag("${_flag}" HAVE_CXX_FLAG${_varname})
         set(${_result} ${HAVE_CXX_FLAG${_varname}} PARENT_SCOPE)