[newlib-cygwin] sched.h: Declare affinity functions only on targets supporting them

[newlib-cygwin] sched.h: Declare affinity functions only on targets supporting them

[Corinna Vinschen]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=8ef2461000797cf01d88eff11189b388709c0ac8

commit 8ef2461000797cf01d88eff11189b388709c0ac8
Author: Corinna Vinschen <corinna@vinschen.de>
Date:   Mon Aug 12 12:13:20 2019 +0200

    sched.h: Declare affinity functions only on targets supporting them

Diff:
---
 newlib/libc/include/sched.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/newlib/libc/include/sched.h b/newlib/libc/include/sched.h
index 79b775e..31599aa 100644
--- a/newlib/libc/include/sched.h
+++ b/newlib/libc/include/sched.h
@@ -93,10 +93,16 @@ int sched_yield( void );
 #if __GNU_VISIBLE
 int sched_getcpu(void);
 
+/* The following functions should only be declared if the type
+   cpu_set_t is defined through indirect inclusion of sys/cpuset.h,
+   only available on some targets. */
+#ifdef _SYS_CPUSET_H_
 int sched_getaffinity (pid_t, size_t, cpu_set_t *);
 int sched_get_thread_affinity (void *, size_t, cpu_set_t *);
 int sched_setaffinity (pid_t, size_t, const cpu_set_t *);
 int sched_set_thread_affinity (void *, size_t, const cpu_set_t *);
+#endif /* _SYS_CPUSET_H_ */
+
 #endif
 
 #ifdef __cplusplus