[setup - the official Cygwin setup program] branch master, updated. release_2.915

[Jon TURNEY]

https://sourceware.org/git/gitweb.cgi?p=cygwin-apps/setup.git;h=2fd81bdf6ad6fc0c116c4a9b4c888f6b9110c08e

commit 2fd81bdf6ad6fc0c116c4a9b4c888f6b9110c08e
Author: Jon Turney <jon.turney@dronecode.org.uk>
Date:   Sun Jan 9 21:17:14 2022 +0000

    Improve symlinks to absolute paths made for ' --symlink-type native'
    
    Match Cygwin DLL behaviour of not using '\\?\' prefix if the target path
    is short enough not to need it.
    
    This improves how the symlink is reported by CMD buildin 'DIR', and
    handled by File Explorer's file properties dialog.


Diff:
---
 mklink2.cc | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/mklink2.cc b/mklink2.cc
index 190b74d5..cf4df8b1 100644
--- a/mklink2.cc
+++ b/mklink2.cc
@@ -282,6 +282,11 @@ mknativesymlink (const char *from, const char *to)
       // convert back from nt namespace to win32 file namespace to use with
       // CreateSymbolicLinkW()
       wabsto[1] = '\\';
+      // Some parts of Windows don't correctly handle a win32 file namespace
+      // prefix in the symlink target. So, for maximum interoperability, we use
+      // a short path instead, if the target path will be less than MAX_PATH.
+      if (wcslen(wabsto) < (MAX_PATH + 4))
+        wto = wabsto + 4;
     }
   else
     {