Using acosh(0) to get NaN in runtime.

macOS clang 10 optimizes sqrt(-1) out using garbage value
instead.

diff --git a/nxt/auto/clang b/nxt/auto/clang
index b79abef4e11bb3c7d7a9de783f945f95ec1f339d..7aa675a1a6f7e178e51e83c4179bcf40fb4225dd 100644 (file)
--- a/nxt/auto/clang
+++ b/nxt/auto/clang
@@ -314,7 +314,7 @@ nxt_feature_test="#include <math.h>
                   #include <stdint.h>
 
                   int main(void) {
-                      int64_t  i64 = sqrt(-1);
+                      int64_t  i64 = acosh(0);
                       printf(\"%x\", (uint32_t) i64);
                       return 0;
                   }"