fix: define NAME_MAX from _XOPEN_NAME_MAX

pekdon · pekdon · commit 8fdf1b265d98 · 2021-12-06T09:19:24.000+01:00
On SunOS NAME_MAX is not defined, _XOPEN_NAME_MAX is so fall back to
defining NAME_MAX from _XOPEN_NAME_MAX.
diff --git a/src/nvim/os/os_defs.h b/src/nvim/os/os_defs.h
@@ -13,6 +13,10 @@
 # include "nvim/os/unix_defs.h"
 #endif
 
+#if !defined(NAME_MAX) && defined(_XOPEN_NAME_MAX)
+#define NAME_MAX _XOPEN_NAME_MAX
+#endif
+
 #define BASENAMELEN (NAME_MAX - 5)
 
 // Use the system path length if it makes sense.
