https://git.ruby-lang.org/ruby.git/commit/?id=33e9601938

From 33e9601938a79dae149caa88ff1bc06d376dd376 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=8D=9C=E9=83=A8=E6=98=8C=E5=B9=B3?=
 <shyouhei@r...>
Date: Tue, 3 Dec 2019 11:02:10 +0900
Subject: TIMESPEC_SEC_MAX might be bigger than 53 bits.

The same as 41bc766763dba63ae2529f2f9070b8e26399745c.  Read that commit
for what is happening.

diff --git a/thread.c b/thread.c
index 39114db..da36b62 100644
--- a/thread.c
+++ b/thread.c
@@ -1192,11 +1192,21 @@ thread_value(VALUE self) https://github.com/ruby/ruby/blob/trunk/thread.c#L1192
 #define TIMESPEC_SEC_MAX TIMET_MAX
 #define TIMESPEC_SEC_MIN TIMET_MIN
 
+COMPILER_WARNING_PUSH
+#if __has_warning("-Wimplicit-int-float-conversion")
+COMPILER_WARNING_IGNORED(-Wimplicit-int-float-conversion)
+#elif defined(_MSC_VER)
+/* C4305: 'initializing': truncation from '__int64' to 'const double' */
+COMPILER_WARNING_IGNORED(4305)
+#endif
+static const double TIMESPEC_SEC_MAX_as_doube = TIMESPEC_SEC_MAX;
+COMPILER_WARNING_POP
+
 static rb_hrtime_t *
 double2hrtime(rb_hrtime_t *hrt, double d)
 {
     /* assume timespec.tv_sec has same signedness as time_t */
-    const double TIMESPEC_SEC_MAX_PLUS_ONE = 2.0 * (TIMESPEC_SEC_MAX / 2 + 1.0);
+    const double TIMESPEC_SEC_MAX_PLUS_ONE = 2.0 * (TIMESPEC_SEC_MAX_as_doube / 2.0 + 1.0);
 
     if (TIMESPEC_SEC_MAX_PLUS_ONE <= d) {
         return NULL;
-- 
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