[PATCH 1/2] testsuite: New effective-target sleep

See also PR libfortran/125005.  Ok for trunk and gcc-16?
-- >8 --
libgfortran calls sleep, which is not available on all targets.

gcc:
	* doc/sourcebuild.texi (Effective-Target Keywords): Document 'sleep'.

gcc/testsuite:
	* lib/target-supports.exp (check_effective_target_sleep): New.
---
 gcc/doc/sourcebuild.texi              |  3 +++
 gcc/testsuite/lib/target-supports.exp | 11 +++++++++++
 2 files changed, 14 insertions(+)

diff --git a/gcc/doc/sourcebuild.texi b/gcc/doc/sourcebuild.texi
index 3bccb1384d9f..4ca7a0810ec7 100644
--- a/gcc/doc/sourcebuild.texi
+++ b/gcc/doc/sourcebuild.texi
@@ -2838,6 +2838,9 @@ both scalar and vector modes.
 @item alarm
 Target supports @code{alarm}.
 
+@item sleep
+Target supports @code{sleep}.
+
 @item c
 The language for the compiler under test is C.
 
diff --git a/gcc/testsuite/lib/target-supports.exp b/gcc/testsuite/lib/target-supports.exp
index e7165e2e1b8c..1dd2e164daa5 100644
--- a/gcc/testsuite/lib/target-supports.exp
+++ b/gcc/testsuite/lib/target-supports.exp
@@ -14823,6 +14823,17 @@ proc check_effective_target_alarm { } {
     }]
 }
 
+# Return true if sleep is supported on the target.
+
+proc check_effective_target_sleep { } {
+    return [check_no_compiler_messages sleep executable {
+	#include <unistd.h>
+	int main (void) { 
+	  sleep (1);
+	}
+    }]
+}
+
 # Return true if a speculation barrier is defined on the target.
 proc check_effective_target_speculation_barrier_defined { } {
     return [check_no_compiler_messages speculation_barrier_defined assembly {
-- 
2.30.2