* lib/at-func.c: If GNULIB_SUPPORT_ONLY_AT_FDCWD, then support
this function only if its first argument is AT_FDCWD.
Emacs wants faccessat for AT_EACCESS but not for any first-arg
values other than AT_FDCWD, so it doesn't want all the openat
machinery with fchdir etc.
* modules/faccessat, modules/fchmodat, modules/fchownat (Files):
* modules/fstatat, modules/mkdirat, modules/openat (Files):
* modules/unlinkat (Files):
Remove lib/openat-priv.h, as at-internal supplies this file.
Removing this file here allows us to support programs like Emacs
that avoid at-internal.

* modules/utimens (Depends-on): Add fcntl-h.
* modules/areadlinkat (Depends-on): Likewise.
* modules/areadlinkat-with-size (Depends-on): Likewise.
* modules/faccessat (Depends-on): Likewise.
* modules/fchmodat (Depends-on): Likewise.
* modules/fchownat (Depends-on): Likewise.
* modules/getcwd (Depends-on): Likewise.
* modules/mkdirat (Depends-on): Likewise.
* modules/mkfifoat (Depends-on): Likewise.
* modules/readlinkat (Depends-on): Likewise.
* modules/symlinkat (Depends-on): Likewise.
* modules/dup2-tests (Depends-on): Likewise.
* modules/fdutimensat-tests (Depends-on): Likewise.
* modules/futimens-tests (Depends-on): Likewise.

* modules/faccessat (Depends-on): Add conditions.
* modules/fchmodat (Depends-on): Likewise.
* modules/fchownat (Depends-on): Likewise.
* modules/fstatat (Depends-on): Likewise.
* modules/mkfifoat (Depends-on): Likewise.
* modules/readlinkat (Depends-on): Likewise.
* modules/symlinkat (Depends-on): Likewise.
* modules/unlinkat (Depends-on): Likewise.
* modules/utimensat (Depends-on): Likewise.
* modules/mkdirat (Depends-on): Add sys_stat. Add conditions.
* modules/linkat (Depends-on): Refine the conditions.
* modules/renameat (Depends-on): Likewise.

* m4/openat.m4 (gl_FUNC_OPENAT): Don't set GNULIB_OPENAT. Don't
invoke gl_PREREQ_OPENAT and gl_MODULE_INDICATOR.
* modules/openat (Description): Add reference to POSIX function.
(Files): Remove lib/openat.h, lib/openat-proc.c.
(Depends-on): Add at-internal, openat-h. Remove fdopendir, gettext-h,
intprops, unistd.
(configure.ac): Remove AC_LIBOBJ of openat-proc. Invoke
gl_PREREQ_OPENAT, gl_MODULE_INDICATOR here. Invoke
gl_FCNTL_MODULE_INDICATOR.
(Include): Remove unistd.h, openat.h.
* modules/areadlinkat (Files): Add lib/at-func.c.
(Depends-on): Add at-internal, dosname, errno, extensions, fchdir,
openat-die, openat-h, save-cwd.
* modules/areadlinkat-with-size (Files): Add lib/at-func.c.
(Depends-on): Add at-internal, dosname, errno, extensions, fchdir,
openat-die, openat-h, save-cwd, unistd.
* modules/faccessat (Files): Add lib/at-func.c, lib/openat-priv.h.
(Depends-on): Add at-internal, dosname, errno, fchdir, openat-die,
openat-h, save-cwd. Remove fcntl-h, openat.
* modules/fchmodat (Files): Remove lib/openat.h.
(Depends-on): Add at-internal, openat-h. Remove dirent, fcntl-h,
openat, stdbool, unistd.
* modules/fchownat (Files): Remove lib/openat.h.
(Depends-on): Add at-internal, openat-h. Remove dirent, fcntl-h,
openat, stdbool, sys_stat.
* modules/fdopendir (Files): Remove lib/openat-priv.h,
lib/openat-proc.c.
(Depends-on): Add at-internal.
(condigure.ac): Remove AC_LIBOBJ of openat-proc.
* modules/fstatat (Files): Remove lib/openat.h.
(Depends-on): Add at-internal, openat-h. Remove dirent, openat,
stdbool, unistd.
* modules/fts (Depends-on): Add openat-h.
* modules/linkat (Depends-on): Add at-internal, openat-h. Remove
openat.
* modules/mkdirat (Files): Remove lib/openat.h.
(Depends-on): Add at-internal, openat-h. Remove dirent, fcntl-h,
openat, stdbool, sys_stat.
* modules/mkfifoat (Files): Add lib/at-func.c.
(Depends-on): Add at-internal, dosname, errno, fchdir, openat-die,
openat-h, save-cwd. Remove fcntl-h, openat.
* modules/openat-die (Depends-on): Add openat-h. Remove openat.
* modules/readlinkat (Files): Add lib/at-func.c.
(Depends-on): Add at-internal, dosname, errno, fchdir, openat-die,
openat-h, save-cwd. Remove fcntl-h, openat.
* modules/renameat (Depends-on): Add at-internal, openat-h. Remove
openat.
* modules/selinux-at (Files): Add lib/at-func.c.
(Depends-on): Add at-internal, dosname, errno, extensions, fchdir,
fcntl-h, openat-die, openat-h, save-cwd, unistd. Remove openat.
* modules/symlinkat (Files): Add lib/at-func.c.
(Depends-on): Add at-internal, dosname, errno, fchdir, openat-die,
openat-h, save-cwd. Remove fcntl-h, openat.
* modules/unlinkat (Files): Remove lib/openat.h.
(Depends-on): Add at-internal, openat-h. Remove dirent, openat,
stdbool.
* modules/utimensat (Files): Add lib/at-func.c.
(Depends-on): Add at-internal, dosname, errno, fchdir, fcntl-h,
openat-die, openat-h, save-cwd.
* modules/fchownat-tests (Depends-on): Add openat-h. Remove openat.
* modules/fdutimensat-tests (Depends-on): Add openat.
* modules/fstatat-tests (Depends-on): Add openat-h.
* modules/readlinkat-tests (Depends-on): Add openat.
* modules/symlinkat-tests (Depends-on): Add openat.

* m4/mkdirat.m4: New file. extracted from m4/openat.m4.
* m4/openat.m4 (gl_FUNC_OPENAT): Don't require gl_SYS_STAT_H_DEFAULTS.
Don't test for mkdirat. Don't set GNULIB_MKDIRAT, HAVE_MKDIRAT.
* modules/mkdirat: New file, extracted from modules/openat.
* modules/openat (Files): Remove lib/mkdirat.c.
(Depends-on): Remove mkdir.
(configure.ac): Remove AC_LIBOBJ of mkdirat.
(Include): Remove <sys/stat.h>.
* modules/mkdirat-tests: New file, extracted from modules/openat-tests.
* modules/openat-tests (Files): Remove tests/test-mkdirat.c,
tests/test-mkdir.h.
(Depends-on): Remove ignore-value.
(Makefile.am): Remove rules for test-mkdirat.
* doc/posix-functions/mkdirat.texi: Mention module 'mkdirat' instead
of module 'openat'.
* NEWS: Mention the change.