[UNIKRAFT/NEWLIB PATCH] Define tzname

[Felipe Huici <felipe.huici@xxxxxxxxx>]

Currently, tzname is defined as an extern, which results in a
undefined reference linker error when attempting to use
it. This patch maps tzname to _tzanme, which *is*
defined. newlib does this mapping in OS-specific files that we
don't compile in, so this is a way to mimic that behavior.

 Signed-off-by: Felipe Huici <felipe.huici@xxxxxxxxx>
---
 include/time.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/include/time.h b/include/time.h
index a510293..0f94358 100644
--- a/include/time.h
+++ b/include/time.h
@@ -70,4 +70,8 @@ extern long _timezone;
 extern int _daylight;
 extern char *_tzname[2];
 
+#ifndef tzname
+#define tzname _tzname
+#endif
+
 #endif /* NEWLIBGLUE_TIME_H */
-- 
2.20.1