[flang] Remove C++ runtime dependency from Sleep extension

DavidTruby · DavidTruby · commit fba6637edf00 · 2024-05-02T14:47:15.000+01:00
The Sleep extension currently has a potential dependency on the C++ runtime. I
run into this dependency using libc++ on Linux. This patch uses the POSIX
`sleep` function or the Windows `Sleep` function instead to avoid this
dependency.
diff --git a/flang/runtime/extensions.cpp b/flang/runtime/extensions.cpp
@@ -136,7 +136,11 @@ void RTNAME(Sleep)(std::int64_t seconds) {
   if (seconds < 1) {
     return;
   }
-  std::this_thread::sleep_for(std::chrono::seconds(seconds));
+#if _WIN32
+  Sleep(seconds * 1000);
+#else
+  sleep(seconds);
+#endif
 }
 
 // TODO: not supported on Windows

Original file line number	Diff line number	Diff line change
`@@ -136,7 +136,11 @@ void RTNAME(Sleep)(std::int64_t seconds) {`
`136`	`136`	`if (seconds < 1) {`
`137`	`137`	`return;`
`138`	`138`	`}`
`139`		`- std::this_thread::sleep_for(std::chrono::seconds(seconds));`
	`139`	`+#if _WIN32`
	`140`	`+ Sleep(seconds * 1000);`
	`141`	`+#else`
	`142`	`+ sleep(seconds);`
	`143`	`+#endif`
`140`	`144`	`}`
`141`	`145`
`142`	`146`	`// TODO: not supported on Windows`