Update from Gnulib

This incorporates:
2020-02-08 lchmod: ensure declaration on HP-UX
2020-02-08 fchmodat: fix endless recursion on Cygwin
2020-02-08 Fix compilation errors in a testdir
2020-02-07 fchmodat: AT_SYMLINK_NOFOLLOW fix for non-symlinks
2020-02-04 Port _Noreturn to older Clang
2020-02-03 libc-config: port to Apple’s Clang variant
* lib/_Noreturn.h, lib/c++defs.h, lib/libc-config.h, lib/sys_stat.in.h:
* m4/gnulib-common.m4, m4/sys_stat_h.m4: Copy from Gnulib.
* lib/gnulib.mk.in: Regenerate.

5 files changed, 42 insertions, 24 deletions

diff --git a/lib/_Noreturn.h b/lib/_Noreturn.h
index 0d4b9c29e02..394ca3c2aa2 100644
--- a/lib/_Noreturn.h
+++ b/lib/_Noreturn.h
@@ -28,7 +28,10 @@
 #  define _Noreturn [[noreturn]]
 # elif ((!defined __cplusplus || defined __clang__)                     \
         && (201112 <= (defined __STDC_VERSION__ ? __STDC_VERSION__ : 0)  \
-            || 4 < __GNUC__ + (7 <= __GNUC_MINOR__)))
+            || 4 < __GNUC__ + (7 <= __GNUC_MINOR__) \
+            || (defined __apple_build_version__ \
+                ? 6000000 <= __apple_build_version__ \
+                : 3 < __clang_major__ + (5 <= __clang_minor__))))
    /* _Noreturn works as-is.  */
 # elif 2 < __GNUC__ + (8 <= __GNUC_MINOR__) || 0x5110 <= __SUNPRO_C
 #  define _Noreturn __attribute__ ((__noreturn__))
diff --git a/lib/c++defs.h b/lib/c++defs.h
index 7a057633883..3e6aaabc9ce 100644
--- a/lib/c++defs.h
+++ b/lib/c++defs.h
@@ -301,9 +301,6 @@
     _GL_WARN_ON_USE_CXX (func, rettype, parameters_and_attributes, \
                          "The symbol ::" #func " refers to the system function. " \
                          "Use " #namespace "::" #func " instead.")
-# elif __GNUC__ >= 3 && GNULIB_STRICT_CHECKING
-#  define _GL_CXXALIASWARN1_2(func,rettype,parameters_and_attributes,namespace) \
-     extern __typeof__ (func) func
 # else
 #  define _GL_CXXALIASWARN1_2(func,rettype,parameters_and_attributes,namespace) \
      _GL_EXTERN_C int _gl_cxxalias_dummy
diff --git a/lib/gnulib.mk.in b/lib/gnulib.mk.in
index 1c8085b1a41..6775db00015 100644
--- a/lib/gnulib.mk.in
+++ b/lib/gnulib.mk.in
@@ -854,6 +854,7 @@ REPLACE_DPRINTF = @REPLACE_DPRINTF@
 REPLACE_DUP = @REPLACE_DUP@
 REPLACE_DUP2 = @REPLACE_DUP2@
 REPLACE_FACCESSAT = @REPLACE_FACCESSAT@
+REPLACE_FCHMODAT = @REPLACE_FCHMODAT@
 REPLACE_FCHOWNAT = @REPLACE_FCHOWNAT@
 REPLACE_FCLOSE = @REPLACE_FCLOSE@
 REPLACE_FCNTL = @REPLACE_FCNTL@
@@ -885,6 +886,7 @@ REPLACE_GETTIMEOFDAY = @REPLACE_GETTIMEOFDAY@
 REPLACE_GMTIME = @REPLACE_GMTIME@
 REPLACE_INITSTATE = @REPLACE_INITSTATE@
 REPLACE_ISATTY = @REPLACE_ISATTY@
+REPLACE_LCHMOD = @REPLACE_LCHMOD@
 REPLACE_LCHOWN = @REPLACE_LCHOWN@
 REPLACE_LINK = @REPLACE_LINK@
 REPLACE_LINKAT = @REPLACE_LINKAT@
@@ -2935,9 +2937,11 @@ sys/stat.h: sys_stat.in.h $(top_builddir)/config.status $(CXXDEFS_H) $(ARG_NONNU
               -e 's|@''HAVE_MKNOD''@|$(HAVE_MKNOD)|g' \
               -e 's|@''HAVE_MKNODAT''@|$(HAVE_MKNODAT)|g' \
               -e 's|@''HAVE_UTIMENSAT''@|$(HAVE_UTIMENSAT)|g' \
+              -e 's|@''REPLACE_FCHMODAT''@|$(REPLACE_FCHMODAT)|g' \
               -e 's|@''REPLACE_FSTAT''@|$(REPLACE_FSTAT)|g' \
               -e 's|@''REPLACE_FSTATAT''@|$(REPLACE_FSTATAT)|g' \
               -e 's|@''REPLACE_FUTIMENS''@|$(REPLACE_FUTIMENS)|g' \
+              -e 's|@''REPLACE_LCHMOD''@|$(REPLACE_LCHMOD)|g' \
               -e 's|@''REPLACE_LSTAT''@|$(REPLACE_LSTAT)|g' \
               -e 's|@''REPLACE_MKDIR''@|$(REPLACE_MKDIR)|g' \
               -e 's|@''REPLACE_MKFIFO''@|$(REPLACE_MKFIFO)|g' \
diff --git a/lib/libc-config.h b/lib/libc-config.h
index aef1f793242..124f1d77e01 100644
--- a/lib/libc-config.h
+++ b/lib/libc-config.h
@@ -55,8 +55,17 @@
 
 #ifndef __glibc_clang_prereq
 # if defined __clang_major__ && defined __clang_minor__
-#  define __glibc_clang_prereq(maj, min) \
-     ((maj) < __clang_major__ + ((min) <= __clang_minor__))
+#  ifdef __apple_build_version__
+/* Apple for some reason renumbers __clang_major__ and __clang_minor__.
+   Gnulib code uses only __glibc_clang_prereq (3, 5); map it to
+   6000000 <= __apple_build_version__.  Support for other calls to
+   __glibc_clang_prereq can be added here as needed.  */
+#   define __glibc_clang_prereq(maj, min) \
+      ((maj) == 3 && (min) == 5 ? 6000000 <= __apple_build_version__ : 0)
+#  else
+#   define __glibc_clang_prereq(maj, min) \
+      ((maj) < __clang_major__ + ((min) <= __clang_minor__))
+#  endif
 # else
 #  define __glibc_clang_prereq(maj, min) 0
 # endif
diff --git a/lib/sys_stat.in.h b/lib/sys_stat.in.h
index c1e3243c1fe..e3ab3153fbf 100644
--- a/lib/sys_stat.in.h
+++ b/lib/sys_stat.in.h
@@ -392,13 +392,25 @@ struct stat
 
 
 #if @GNULIB_FCHMODAT@
-# if !@HAVE_FCHMODAT@
+# if @REPLACE_FCHMODAT@
+#  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
+#   undef fchmodat
+#   define fchmodat rpl_fchmodat
+#  endif
+_GL_FUNCDECL_RPL (fchmodat, int,
+                  (int fd, char const *file, mode_t mode, int flag)
+                  _GL_ARG_NONNULL ((2)));
+_GL_CXXALIAS_RPL (fchmodat, int,
+                  (int fd, char const *file, mode_t mode, int flag));
+# else
+#  if !@HAVE_FCHMODAT@
 _GL_FUNCDECL_SYS (fchmodat, int,
                   (int fd, char const *file, mode_t mode, int flag)
                   _GL_ARG_NONNULL ((2)));
-# endif
+#  endif
 _GL_CXXALIAS_SYS (fchmodat, int,
                   (int fd, char const *file, mode_t mode, int flag));
+# endif
 _GL_CXXALIASWARN (fchmodat);
 #elif defined GNULIB_POSIXCHECK
 # undef fchmodat
@@ -502,31 +514,24 @@ _GL_WARN_ON_USE (futimens, "futimens is not portable - "
 #if @GNULIB_LCHMOD@
 /* Change the mode of FILENAME to MODE, without dereferencing it if FILENAME
    denotes a symbolic link.  */
-# if !@HAVE_LCHMOD@
-/* The lchmod replacement follows symbolic links.  Callers should take
-   this into account; lchmod should be applied only to arguments that
-   are known to not be symbolic links.  On hosts that lack lchmod,
-   this can lead to race conditions between the check and the
-   invocation of lchmod, but we know of no workarounds that are
-   reliable in general.  You might try requesting support for lchmod
-   from your operating system supplier.  */
+# if @REPLACE_LCHMOD@
 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
-#   define lchmod chmod
+#   undef lchmod
+#   define lchmod rpl_lchmod
 #  endif
-/* Need to cast, because on mingw, the second parameter of chmod is
-                                                int mode.  */
-_GL_CXXALIAS_RPL_CAST_1 (lchmod, chmod, int,
-                         (const char *filename, mode_t mode));
+_GL_FUNCDECL_RPL (lchmod, int,
+                  (char const *filename, mode_t mode)
+                  _GL_ARG_NONNULL ((1)));
+_GL_CXXALIAS_RPL (lchmod, int,
+                  (char const *filename, mode_t mode));
 # else
-#  if 0 /* assume already declared */
+#  if !@HAVE_LCHMOD@ || defined __hpux
 _GL_FUNCDECL_SYS (lchmod, int, (const char *filename, mode_t mode)
                                _GL_ARG_NONNULL ((1)));
 #  endif
 _GL_CXXALIAS_SYS (lchmod, int, (const char *filename, mode_t mode));
 # endif
-# if @HAVE_LCHMOD@
 _GL_CXXALIASWARN (lchmod);
-# endif
 #elif defined GNULIB_POSIXCHECK
 # undef lchmod
 # if HAVE_RAW_DECL_LCHMOD