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-rw-r--r--ares/m4/cares-compilers.m49
1 files changed, 7 insertions, 2 deletions
diff --git a/ares/m4/cares-compilers.m4 b/ares/m4/cares-compilers.m4
index ae32988d7..3a5738971 100644
--- a/ares/m4/cares-compilers.m4
+++ b/ares/m4/cares-compilers.m4
@@ -835,11 +835,11 @@ AC_DEFUN([CARES_SET_COMPILER_WARNING_OPTS], [
#
if test "$want_warnings" = "yes"; then
dnl All versions of clang support the same warnings as at least
- dnl gcc 4.2.1.
+ dnl gcc 4.2.1 except -Wunused.
tmp_CFLAGS="$tmp_CFLAGS -pedantic"
tmp_CFLAGS="$tmp_CFLAGS -Wall -Wextra"
tmp_CFLAGS="$tmp_CFLAGS -Wpointer-arith -Wwrite-strings"
- tmp_CFLAGS="$tmp_CFLAGS -Wunused -Wshadow"
+ tmp_CFLAGS="$tmp_CFLAGS -Wshadow"
tmp_CFLAGS="$tmp_CFLAGS -Winline -Wnested-externs"
tmp_CFLAGS="$tmp_CFLAGS -Wmissing-declarations"
tmp_CFLAGS="$tmp_CFLAGS -Wmissing-prototypes"
@@ -853,6 +853,11 @@ AC_DEFUN([CARES_SET_COMPILER_WARNING_OPTS], [
tmp_CFLAGS="$tmp_CFLAGS -Wcast-align"
tmp_CFLAGS="$tmp_CFLAGS -Wno-system-headers"
tmp_CFLAGS="$tmp_CFLAGS -Wshorten-64-to-32"
+ #
+ dnl Only clang 1.1 or later
+ if test "$compiler_num" -ge "101"; then
+ tmp_CFLAGS="$tmp_CFLAGS -Wunused"
+ fi
fi
;;
#