Add -Wno-tautological-compare to the standard compile flags, if that
is accepted. With XCode 5.5.1 -Wtautological-compare appears to come
as standard, and it generates a lot of mostly useless noise.
git-svn-id: svn://svn.valgrind.org/valgrind/trunk@14136 a5019735-40e9-0310-863c-91ae7b9d1cf9
diff --git a/configure.ac b/configure.ac
index e87a2e4..c91ea94 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1727,6 +1727,25 @@
CFLAGS=$safe_CFLAGS
+# does this compiler support -Wno-tautological-compare ?
+
+AC_MSG_CHECKING([if gcc accepts -Wno-tautological-compare])
+
+safe_CFLAGS=$CFLAGS
+CFLAGS="-Wno-tautological-compare"
+
+AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[ ]], [[
+ return 0;
+]])], [
+AC_SUBST([FLAG_W_NO_TAUTOLOGICAL_COMPARE], [-Wno-tautological-compare])
+AC_MSG_RESULT([yes])
+], [
+AC_SUBST([FLAG_W_NO_TAUTOLOGICAL_COMPARE], [])
+AC_MSG_RESULT([no])
+])
+CFLAGS=$safe_CFLAGS
+
+
# does this compiler support -Wno-nonnull ?
AC_MSG_CHECKING([if gcc accepts -Wno-nonnull])