build: don't warn on unused parameters

Signed-off-by: Steve Markgraf <steve@steve-m.de>

CMakeLists.txt

@@ -49,6 +49,7 @@ include(Version) # setup version info
 if(CMAKE_COMPILER_IS_GNUCC AND NOT WIN32)
     ADD_DEFINITIONS(-Wall)
     ADD_DEFINITIONS(-Wextra)
+    ADD_DEFINITIONS(-Wno-unused-parameter)
     ADD_DEFINITIONS(-Wno-unused)
     ADD_DEFINITIONS(-Wsign-compare)
     #http://gcc.gnu.org/wiki/Visibility

configure.ac

@@ -61,7 +61,7 @@ AC_SUBST(SYMBOL_VISIBILITY)
 
 AC_MSG_CHECKING(whether compiler understands -Wall)
 old_CFLAGS="$CFLAGS"
-CFLAGS="$CFLAGS -Wall -Wextra -Wno-unused -Wsign-compare"
+CFLAGS="$CFLAGS -Wall -Wextra -Wno-unused-parameter -Wno-unused -Wsign-compare"
 AC_TRY_COMPILE([],[],
   AC_MSG_RESULT(yes),
   AC_MSG_RESULT(no)