Update Gnulib.

All changes in this commit are autogenerated by running
admin/merge-gnulib.

3 files changed, 54 insertions, 21 deletions

diff --git a/m4/canonicalize.m4 b/m4/canonicalize.m4
index 14ea3e12fa0..c8da4dfcb6b 100644
--- a/m4/canonicalize.m4
+++ b/m4/canonicalize.m4
@@ -1,4 +1,4 @@
-# canonicalize.m4 serial 33
+# canonicalize.m4 serial 34
 
 dnl Copyright (C) 2003-2007, 2009-2020 Free Software Foundation, Inc.
 
@@ -11,7 +11,9 @@ dnl with or without modifications, as long as this notice is preserved.
 AC_DEFUN([gl_FUNC_CANONICALIZE_FILENAME_MODE],
 [
   AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
-  AC_CHECK_FUNCS_ONCE([canonicalize_file_name])
+  AC_REQUIRE([gl_FUNC_FACCESSAT_EOVERFLOW])
+  AC_REQUIRE([gl_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK])
+  AC_CHECK_FUNCS_ONCE([canonicalize_file_name faccessat])
   AC_REQUIRE([gl_DOUBLE_SLASH_ROOT])
   AC_REQUIRE([gl_FUNC_REALPATH_WORKS])
   if test $ac_cv_func_canonicalize_file_name = no; then
@@ -56,7 +58,9 @@ AC_DEFUN([gl_CANONICALIZE_LGPL],
 AC_DEFUN([gl_CANONICALIZE_LGPL_SEPARATE],
 [
   AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
-  AC_CHECK_FUNCS_ONCE([canonicalize_file_name readlink])
+  AC_REQUIRE([gl_FUNC_FACCESSAT_EOVERFLOW])
+  AC_REQUIRE([gl_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK])
+  AC_CHECK_FUNCS_ONCE([canonicalize_file_name faccessat])
 
   dnl On native Windows, we use _getcwd(), regardless whether getcwd() is
   dnl available through the linker option '-loldnames'.
diff --git a/m4/faccessat.m4 b/m4/faccessat.m4
index 7a8b979f8db..a4ad31a469b 100644
--- a/m4/faccessat.m4
+++ b/m4/faccessat.m4
@@ -1,4 +1,4 @@
-# serial 8
+# serial 9
 # See if we need to provide faccessat replacement.
 
 dnl Copyright (C) 2009-2020 Free Software Foundation, Inc.
@@ -8,6 +8,31 @@ dnl with or without modifications, as long as this notice is preserved.
 
 # Written by Eric Blake.
 
+AC_DEFUN([gl_FUNC_FACCESSAT_EOVERFLOW],
+[
+  AC_CHECK_FUNCS_ONCE([faccessat])
+  if test "$ac_cv_func_faccessat" = yes; then
+    AC_CACHE_CHECK([whether faccessat works when stat would EOVERFLOW],
+      [gl_cv_func_faccessat_never_eoverflows],
+      [AC_COMPILE_IFELSE(
+         [AC_LANG_PROGRAM([],
+            [[#ifdef __linux__
+               #include <linux/version.h>
+               #if (! (KERNEL_VERSION (5, 8, 0) <= LINUX_VERSION_CODE \
+                    && 2 < (__GLIBC__ + (33 <= __GLIBC_MINOR__))))
+                #error "faccessat might fail with EOVERFLOW"
+               #endif
+              #endif
+            ]])],
+         [gl_cv_func_faccessat_never_eoverflows=yes],
+         [gl_cv_func_faccessat_never_eoverflows=no])])
+    if test "$gl_cv_func_faccessat_never_eoverflows" = yes; then
+      AC_DEFINE([FACCESSAT_NEVER_EOVERFLOWS], 1,
+        [Define to 1 if faccessat is EOVERFLOW-free.])
+    fi
+  fi
+])
+
 AC_DEFUN([gl_FUNC_FACCESSAT],
 [
   AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
@@ -16,12 +41,14 @@ AC_DEFUN([gl_FUNC_FACCESSAT],
   dnl Persuade glibc <unistd.h> to declare faccessat().
   AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
 
+  AC_REQUIRE([gl_FUNC_FACCESSAT_EOVERFLOW])
+
   AC_CHECK_FUNCS_ONCE([faccessat])
   if test $ac_cv_func_faccessat = no; then
     HAVE_FACCESSAT=0
   else
-    case "$gl_cv_func_lstat_dereferences_slashed_symlink" in
-      *yes) ;;
+    case $gl_cv_func_lstat_dereferences_slashed_symlink,$gl_cv_func_faccessat_never_eoverflows in
+      *yes,*yes) ;;
       *)    REPLACE_FACCESSAT=1 ;;
     esac
   fi
diff --git a/m4/gnulib-comp.m4 b/m4/gnulib-comp.m4
index beb9817d266..0971636c33d 100644
--- a/m4/gnulib-comp.m4
+++ b/m4/gnulib-comp.m4
@@ -75,6 +75,7 @@ AC_DEFUN([gl_EARLY],
   # Code from module dtoastr:
   # Code from module dtotimespec:
   # Code from module dup2:
+  # Code from module eloop-threshold:
   # Code from module environ:
   # Code from module errno:
   # Code from module euidaccess:
@@ -291,6 +292,12 @@ AC_DEFUN([gl_INIT],
   if test $gl_cv_func___fpending = no; then
     AC_LIBOBJ([fpending])
   fi
+  gl_FUNC_FREE
+  if test $REPLACE_FREE = 1; then
+    AC_LIBOBJ([free])
+    gl_PREREQ_FREE
+  fi
+  gl_STDLIB_MODULE_INDICATOR([free-posix])
   gl_FUNC_FSTATAT
   if test $HAVE_FSTATAT = 0 || test $REPLACE_FSTATAT = 1; then
     AC_LIBOBJ([fstatat])
@@ -510,8 +517,8 @@ AC_DEFUN([gl_INIT],
   gl_gnulib_enabled_260941c0e5dc67ec9e87d1fb321c300b=false
   gl_gnulib_enabled_cloexec=false
   gl_gnulib_enabled_dirfd=false
+  gl_gnulib_enabled_925677f0343de64b89a9f0c790b4104c=false
   gl_gnulib_enabled_euidaccess=false
-  gl_gnulib_enabled_ef07dc4b3077c11ea9cef586db4e5955=false
   gl_gnulib_enabled_getdtablesize=false
   gl_gnulib_enabled_getgroups=false
   gl_gnulib_enabled_be453cec5eecf5731a274f2de7f2db36=false
@@ -557,6 +564,12 @@ AC_DEFUN([gl_INIT],
       gl_gnulib_enabled_dirfd=true
     fi
   }
+  func_gl_gnulib_m4code_925677f0343de64b89a9f0c790b4104c ()
+  {
+    if ! $gl_gnulib_enabled_925677f0343de64b89a9f0c790b4104c; then
+      gl_gnulib_enabled_925677f0343de64b89a9f0c790b4104c=true
+    fi
+  }
   func_gl_gnulib_m4code_euidaccess ()
   {
     if ! $gl_gnulib_enabled_euidaccess; then
@@ -573,18 +586,6 @@ AC_DEFUN([gl_INIT],
       func_gl_gnulib_m4code_6099e9737f757db36c47fa9d9f02e88c
     fi
   }
-  func_gl_gnulib_m4code_ef07dc4b3077c11ea9cef586db4e5955 ()
-  {
-    if ! $gl_gnulib_enabled_ef07dc4b3077c11ea9cef586db4e5955; then
-      gl_FUNC_FREE
-      if test $REPLACE_FREE = 1; then
-        AC_LIBOBJ([free])
-        gl_PREREQ_FREE
-      fi
-      gl_STDLIB_MODULE_INDICATOR([free-posix])
-      gl_gnulib_enabled_ef07dc4b3077c11ea9cef586db4e5955=true
-    fi
-  }
   func_gl_gnulib_m4code_getdtablesize ()
   {
     if ! $gl_gnulib_enabled_getdtablesize; then
@@ -734,7 +735,7 @@ AC_DEFUN([gl_INIT],
     fi
   }
   if test $HAVE_CANONICALIZE_FILE_NAME = 0 || test $REPLACE_CANONICALIZE_FILE_NAME = 1; then
-    func_gl_gnulib_m4code_ef07dc4b3077c11ea9cef586db4e5955
+    func_gl_gnulib_m4code_925677f0343de64b89a9f0c790b4104c
   fi
   if test $HAVE_CANONICALIZE_FILE_NAME = 0 || test $REPLACE_CANONICALIZE_FILE_NAME = 1; then
     func_gl_gnulib_m4code_idx
@@ -818,8 +819,8 @@ AC_DEFUN([gl_INIT],
   AM_CONDITIONAL([gl_GNULIB_ENABLED_260941c0e5dc67ec9e87d1fb321c300b], [$gl_gnulib_enabled_260941c0e5dc67ec9e87d1fb321c300b])
   AM_CONDITIONAL([gl_GNULIB_ENABLED_cloexec], [$gl_gnulib_enabled_cloexec])
   AM_CONDITIONAL([gl_GNULIB_ENABLED_dirfd], [$gl_gnulib_enabled_dirfd])
+  AM_CONDITIONAL([gl_GNULIB_ENABLED_925677f0343de64b89a9f0c790b4104c], [$gl_gnulib_enabled_925677f0343de64b89a9f0c790b4104c])
   AM_CONDITIONAL([gl_GNULIB_ENABLED_euidaccess], [$gl_gnulib_enabled_euidaccess])
-  AM_CONDITIONAL([gl_GNULIB_ENABLED_ef07dc4b3077c11ea9cef586db4e5955], [$gl_gnulib_enabled_ef07dc4b3077c11ea9cef586db4e5955])
   AM_CONDITIONAL([gl_GNULIB_ENABLED_getdtablesize], [$gl_gnulib_enabled_getdtablesize])
   AM_CONDITIONAL([gl_GNULIB_ENABLED_getgroups], [$gl_gnulib_enabled_getgroups])
   AM_CONDITIONAL([gl_GNULIB_ENABLED_be453cec5eecf5731a274f2de7f2db36], [$gl_gnulib_enabled_be453cec5eecf5731a274f2de7f2db36])
@@ -1020,6 +1021,7 @@ AC_DEFUN([gl_FILE_LIST], [
   lib/dtoastr.c
   lib/dtotimespec.c
   lib/dup2.c
+  lib/eloop-threshold.h
   lib/errno.in.h
   lib/euidaccess.c
   lib/execinfo.c