[njs] Using acosh(0) to get NaN in runtime.

[Dmitry Volyntsev]

details: https://hg.nginx.org/njs/rev/83b64328fbb2
branches:
changeset: 679:83b64328fbb2
user: Dmitry Volyntsev <***@nginx.com>
date: Thu Nov 29 21:01:59 2018 +0300
description:
Using acosh(0) to get NaN in runtime.

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

diffstat:

nxt/auto/clang | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)

diffs (12 lines):

diff -r b7706e03babc -r 83b64328fbb2 nxt/auto/clang
--- a/nxt/auto/clang Wed Nov 28 21:56:19 2018 +0300
+++ b/nxt/auto/clang Thu Nov 29 21:01:59 2018 +0300
@@ -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;
}"