Generate nt/gnulib.mk from lib/gnulib.mk

This was proposed by Paul Eggert <eggert@cs.ucla.edu>,
with the purpose of avoiding manual maintenance of
nt/gnulib.mk.

* nt/gnulib-modules-to-delete.cfg: New file.
* nt/Makefile.in (AM_V_GEN, am__v_GEN_, am__v_GEN_0)
(am__v_GEN_1): New variables.
(${srcdir}/gnulib.mk): Rules to generate gnulib.mk from
lib/gnulib.mk and list of modules in gnulib-modules-to-delete.cfg.

* make-dist (nt): Add gnulib-modules-to-delete.cfg to the list of
files to link.
* configure.ac (GNULIB_MK): Compute the value according to $opsys.
* autogen.sh: Create nt/gnulib.mk if it doesn't exist, before
running autoreconf.
* Makefile.in (gnulib_mk): New variable.
($(srcdir)/nt/gnulib.mk): Rule to produce it.
(AUTOMAKE_INPUTS): Use $(gnulib_mk) instead of a literal file
name.
* .gitignore: Add nt/gnulib.mk.

* src/w32.c (acl_errno_valid): Implement it here, as we no longer
build the acl-permissions module from Gnulib.

1 files changed, 17 insertions, 0 deletions

diff --git a/src/w32.c b/src/w32.c
index 30aced9d9ff..f35ad67d829 100644
--- a/src/w32.c
+++ b/src/w32.c
@@ -6407,6 +6407,23 @@ acl_set_file (const char *fname, acl_type_t type, acl_t acl)
   return retval;
 }
 
+/* Return true if errno value ERRNUM indicates that ACLs are well
+   supported on this system.  ERRNUM should be an errno value obtained
+   after an ACL-related system call fails.  */
+bool
+acl_errno_valid (int errnum)
+{
+  switch (errnum)
+    {
+    case EBUSY:
+    case EINVAL:
+    case ENOTSUP:
+      return false;
+    default:
+      return true;
+    }
+}
+
 
 /* MS-Windows version of careadlinkat (cf. ../lib/careadlinkat.c).  We
    have a fixed max size for file names, so we don't need the kind of