[newlib-cygwin/cygwin-2.0] Revert to exposing sys/select.h from sys/time.h on Cygwin

[Corinna Vinschen]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=a7a784c77460f86d9060140b44e7ffbcee36fbab

commit a7a784c77460f86d9060140b44e7ffbcee36fbab
Author: Corinna Vinschen <corinna@vinschen.de>
Date:   Sat May 2 15:07:44 2015 +0200

    Revert to exposing sys/select.h from sys/time.h on Cygwin
    
    	* libc/include/sys/time.h: Include sys/select.h on Cygwin.  Explain why.
    
    Signed-off-by: Corinna Vinschen <corinna@vinschen.de>

Diff:
---
 newlib/ChangeLog               | 4 ++++
 newlib/libc/include/sys/time.h | 6 ++++++
 2 files changed, 10 insertions(+)

diff --git a/newlib/ChangeLog b/newlib/ChangeLog
index 2e87063..e40d26b 100644
--- a/newlib/ChangeLog
+++ b/newlib/ChangeLog
@@ -1,3 +1,7 @@
+2015-05-02  Corinna Vinschen  <vinschen@redhat.com>
+
+	* libc/include/sys/time.h: Include sys/select.h on Cygwin.  Explain why.
+
 2015-04-29  Corinna Vinschen  <vinschen@redhat.com>
 
 	* libc/include/sys/config.h: Move evaluation of _UINTPTR_EQ_ULONG and
diff --git a/newlib/libc/include/sys/time.h b/newlib/libc/include/sys/time.h
index ce8cad6..e95240e 100644
--- a/newlib/libc/include/sys/time.h
+++ b/newlib/libc/include/sys/time.h
@@ -42,6 +42,12 @@
 #include <sys/types.h>
 #include <sys/timespec.h>
 
+/* Cygwin exposes sys/select.h to users of sys/time.h for a couple of years
+   so we have to maintain that.  Note that this is in accordance with POSIX. */
+#ifdef __CYGWIN__
+#include <sys/select.h>
+#endif /* __CYGWIN__ */
+
 struct timezone {
 	int	tz_minuteswest;	/* minutes west of Greenwich */
 	int	tz_dsttime;	/* type of dst correction */