Quiet clang warnings about unused arguments in general.

Check if we are using clang, rather than simply if we are on OS X.
Note: recent LLVM releases do not seem to need this anyway.

1 files changed, 13 insertions, 1 deletions

diff --git a/configure.ac b/configure.ac
index e20d044..d4a8632 100644
--- a/configure.ac
+++ b/configure.ac
@@ -11,7 +11,6 @@ CFLAGS="$CFLAGS -Wall -std=gnu99 -g"
 case $host_os in
         *darwin*)
                 HOST_OS=darwin;
-                LDFLAGS="$LDFLAGS -Qunused-arguments"
                 ;;
         *freebsd*)
                 HOST_OS=freebsd;
@@ -63,6 +62,19 @@ AC_COMPILE_IFELSE([AC_LANG_PROGRAM([])],
 )
 CFLAGS="$save_cflags $AM_CFLAGS"
 
+AC_MSG_CHECKING([if compiling with clang])
+AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [[
+#ifndef __clang__
+        not clang
+#endif
+        ]])],
+        [AC_MSG_RESULT([yes])]
+        [CLANG_FLAGS=-Qunused-arguments],
+        [AC_MSG_RESULT([no])]
+)
+CFLAGS="$CFLAGS $CLANG_CFLAGS"
+LDFLAGS="$LDFLAGS $CLANG_FLAGS"
+
 AC_CHECK_FUNCS([arc4random_buf asprintf explicit_bzero funopen getauxval])
 AC_CHECK_FUNCS([getentropy issetugid memmem reallocarray])
 AC_CHECK_FUNCS([strlcat strlcpy strndup strnlen strtonum])