I opened up a pull request for this issue a few weeks ago:
https://github.com/vim/vim/pull/505
The short version is that relative paths are handled differently in Cygwin
compared to other platforms. The most obvious manifestation of the bug is that
`fnamemodify('.', ':.')` returns an empty string instead of '.'. This breaks
some plugins (e.g. Unite's grep uses a sensible default path of '.' but that's
broken in Cygwin). The fix (in the pull request and copied below) is to use the
CCP_RELATIVE flag when requesting a full path name from any type of path name.
Thanks,
Jacob Niehus
--------------------------------------------------------------------------------
diff --git a/src/os_unix.c b/src/os_unix.c
index 314a906..7b98f9c 100644
--- a/src/os_unix.c
+++ b/src/os_unix.c
@@ -2500,7 +2500,8 @@ mch_FullName(fname, buf, len, force)
* This helps for when "/etc/hosts" is a symlink to "c:/something/hosts".
*/
# if CYGWIN_VERSION_DLL_MAJOR >= 1007
- cygwin_conv_path(CCP_WIN_A_TO_POSIX, fname, posix_fname, MAXPATHL);
+ cygwin_conv_path(CCP_WIN_A_TO_POSIX | CCP_RELATIVE,
+ fname, posix_fname, MAXPATHL);
# else
cygwin_conv_to_posix_path(fname, posix_fname);
# endif
--
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