1 files changed, 13 insertions, 0 deletions
diff --git a/auto/clang b/auto/clang
index fc69bf6f..dc434940 100644
--- a/auto/clang
+++ b/auto/clang
@@ -87,6 +87,19 @@ nxt_feature_test="int main() {
 . auto/feature
 
 
+nxt_feature="GCC __builtin_clz()"
+nxt_feature_name=NXT_HAVE_BUILTIN_CLZ
+nxt_feature_run=
+nxt_feature_incs=
+nxt_feature_libs=
+nxt_feature_test="int main() {
+                      if (__builtin_clz(1) == 31)
+                          return 0;
+                      return 1;
+                  }"
+. auto/feature
+
+
 nxt_feature="GCC __attribute__ visibility"
 nxt_feature_name=NXT_HAVE_GCC_ATTRIBUTE_VISIBILITY
 nxt_feature_run=