no warnings

configure.ac

@@ -110,8 +110,6 @@ AX_CHECK_COMPILE_FLAG([-Wpedantic],
             [SKELETONS_CFLAGS="$SKELETONS_CFLAGS -pedantic"], [], [-Werror])
     ],
     [-Werror]) #clang 3.0 prints warning when the flag is not supported
-AX_CHECK_COMPILE_FLAG([-Wno-duplicate-decl-specifier],
-    [SKELETONS_CFLAGS="$SKELETONS_CFLAGS -Wno-duplicate-decl-specifier"])
 AC_SUBST(SKELETONS_CFLAGS)
 
 dnl Checks for header files.

skeletons/ANY.c

@@ -190,6 +190,9 @@ ANY_decode_uper(asn_codec_ctx_t *opt_codec_ctx, asn_TYPE_descriptor_t *td,
     int repeat;
     ANY_t *st = (ANY_t *)*sptr;
 
+    (void)opt_codec_ctx;
+    (void)constraints;
+
     /*
      * Allocate the structure.
      */
@@ -241,6 +244,8 @@ ANY_encode_uper(asn_TYPE_descriptor_t *td, asn_per_constraints_t *constraints,
     size_t size;
     int ret;
 
+    (void)constraints;
+
     if(!st || (!st->buf && st->size)) ASN__ENCODE_FAILED;
 
     buf = st->buf;