stat: Fix time_t values and other problems on native Windows platforms.

* doc/posix-functions/stat.texi: Mention the problem with the Microsoft
implementations of stat().
* lib/stat.c: Include filename.h instead of dosname.h. Include
malloca.h, stat-w32.h.
(is_unc_root): New function.
(rpl_stat): New implementation for native Windows. Remove
REPLACE_FUNC_STAT_DIR code.
* m4/stat.m4 (gl_FUNC_STAT): On native Windows, set REPLACE_STAT always.
Don't define REPLACE_FUNC_STAT_DIR.
(gl_PREREQ_STAT): Require gl_HEADER_SYS_STAT_H.
* modules/stat (Files): Add lib/stat-w32.h, lib/stat-w32.c.
(Depends-on): Remove dosname. Add filename, malloca.
(configure.ac): Also compile lib/stat-w32.c.

1 files changed, 9 insertions, 0 deletions

diff --git a/doc/posix-functions/stat.texi b/doc/posix-functions/stat.texi
index 33af95d5ba..c30e7e18f8 100644
--- a/doc/posix-functions/stat.texi
+++ b/doc/posix-functions/stat.texi
@@ -13,6 +13,15 @@ On platforms where @code{off_t} is a 32-bit type, @code{stat} may not correctly
 report the size of files or block devices larger than 2 GB.
 (Cf. @code{AC_SYS_LARGEFILE}.)
 @item
+The @code{st_atime}, @code{st_ctime}, @code{st_mtime} field are affected by
+the current time zone and by the DST flag of the current time zone on some
+platforms:
+mingw, MSVC 14 (when the environment variable @code{TZ} is set).
+@item
+On MSVC 14, this function fails with error @code{ENOENT}
+on files such as @samp{C:\pagefile.sys} and
+on directories such as @samp{C:\System Volume Information}.
+@item
 On some platforms, @code{stat("link-to-file/",buf)} succeeds instead
 of failing with @code{ENOTDIR}.
 FreeBSD 7.2, AIX 7.1, Solaris 9, mingw64.