Merge from gnulib

This incorporates:
2015-06-06 acl-permissions: pacify -Wsuggest-attribute=const
2015-06-05 stdio: Don't redefine gets when using C++
2015-06-05 acl-permissions: port to AIX, C89 HP-UX
2015-06-02 file-has-acl: fix build on Mac OS X 10
2015-06-01 gnulib-tool: concatenate lib_SOURCES to a single line
2015-06-01 pthread_sigmask: discount system version if a simple macro
2015-05-31 readlinkat: avoid OS X 10.10 trailing slash bug
* doc/misc/texinfo.tex, lib/acl-internal.h, lib/get-permissions.c:
* lib/readlinkat.c, lib/set-permissions.c, lib/stdio.in.h:
* m4/acl.m4, m4/pthread_sigmask.m4, m4/readlinkat.m4: Copy from gnulib.
* lib/gnulib.mk: Regenerate.

3 files changed, 58 insertions, 10 deletions

diff --git a/m4/acl.m4 b/m4/acl.m4
index 5da6a43ab6..75fc9ce4c0 100644
--- a/m4/acl.m4
+++ b/m4/acl.m4
@@ -1,5 +1,5 @@
 # acl.m4 - check for access control list (ACL) primitives
-# serial 20
+# serial 21
 
 # Copyright (C) 2002, 2004-2015 Free Software Foundation, Inc.
 # This file is free software; the Free Software Foundation
@@ -181,12 +181,26 @@ AC_DEFUN([gl_FILE_HAS_ACL],
 [
   AC_REQUIRE([gl_FUNC_ACL_ARG])
   if test "$enable_acl" != no; then
-    AC_CHECK_HEADERS([linux/xattr.h])
-    AC_CHECK_HEADERS([sys/xattr.h],
-      [AC_CHECK_FUNCS([getxattr])])
+    AC_CACHE_CHECK([for getxattr with XATTR_NAME_POSIX_ACL macros],
+      [gl_cv_getxattr_with_posix_acls],
+      [gl_cv_getxattr_with_posix_acls=no
+       AC_LINK_IFELSE(
+         [AC_LANG_PROGRAM(
+            [[#include <sys/types.h>
+              #include <sys/xattr.h>
+              #include <linux/xattr.h>
+            ]],
+            [[ssize_t a = getxattr (".", XATTR_NAME_POSIX_ACL_ACCESS, 0, 0);
+              ssize_t b = getxattr (".", XATTR_NAME_POSIX_ACL_DEFAULT, 0, 0);
+              return a < 0 || b < 0;
+            ]])],
+         [gl_cv_getxattr_with_posix_acls=yes])])
   fi
-  if test "$ac_cv_header_sys_xattr_h,$ac_cv_func_getxattr" = yes,yes; then
+  if test "$gl_cv_getxattr_with_posix_acls" = yes; then
     LIB_HAS_ACL=
+    AC_DEFINE([GETXATTR_WITH_POSIX_ACLS], 1,
+      [Define to 1 if getxattr works with XATTR_NAME_POSIX_ACL_ACCESS
+       and XATTR_NAME_POSIX_ACL_DEFAULT.])
   else
     dnl Set gl_need_lib_has_acl to a nonempty value, so that any
     dnl later gl_FUNC_ACL call will set LIB_HAS_ACL=$LIB_ACL.
diff --git a/m4/pthread_sigmask.m4 b/m4/pthread_sigmask.m4
index 5c17dfcd85..2598856646 100644
--- a/m4/pthread_sigmask.m4
+++ b/m4/pthread_sigmask.m4
@@ -1,4 +1,4 @@
-# pthread_sigmask.m4 serial 15
+# pthread_sigmask.m4 serial 16
 dnl Copyright (C) 2011-2015 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -40,6 +40,30 @@ AC_DEFUN([gl_FUNC_PTHREAD_SIGMASK],
              LIBS="$gl_save_LIBS"
             ])
           if test $gl_cv_func_pthread_sigmask_in_LIBMULTITHREAD = yes; then
+            AC_CACHE_CHECK([whether pthread_sigmask is only a macro],
+              [gl_cv_func_pthread_sigmask_is_macro],
+              [gl_save_LIBS="$LIBS"
+               LIBS="$LIBS $LIBMULTITHREAD"
+               AC_LINK_IFELSE(
+                 [AC_LANG_PROGRAM(
+                    [[#include <pthread.h>
+                      #include <signal.h>
+                      #undef pthread_sigmask
+                    ]],
+                    [[return pthread_sigmask (0, (sigset_t *) 0, (sigset_t *) 0);]])
+                 ],
+                 [gl_cv_func_pthread_sigmask_is_macro=no],
+                 [gl_cv_func_pthread_sigmask_is_macro=yes])
+               LIBS="$gl_save_LIBS"
+              ])
+            if test $gl_cv_func_pthread_sigmask_is_macro = yes; then
+              dnl On MinGW pthread_sigmask is just a macro which always returns 0.
+              dnl It does not exist as a real function, which is required by POSIX.
+              REPLACE_PTHREAD_SIGMASK=1
+              gl_cv_func_pthread_sigmask_in_LIBMULTITHREAD=no
+            fi
+          fi
+          if test $gl_cv_func_pthread_sigmask_in_LIBMULTITHREAD = yes; then
             dnl pthread_sigmask is available with -pthread or -lpthread.
             LIB_PTHREAD_SIGMASK="$LIBMULTITHREAD"
           else
diff --git a/m4/readlinkat.m4 b/m4/readlinkat.m4
index d0f5e69274..3477602a14 100644
--- a/m4/readlinkat.m4
+++ b/m4/readlinkat.m4
@@ -1,4 +1,4 @@
-# serial 4
+# serial 5
 # See if we need to provide readlinkat replacement.
 
 dnl Copyright (C) 2009-2015 Free Software Foundation, Inc.
@@ -13,6 +13,7 @@ AC_DEFUN([gl_FUNC_READLINKAT],
   AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
   AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
   AC_CHECK_FUNCS_ONCE([readlinkat])
+  AC_REQUIRE([gl_FUNC_READLINK])
   if test $ac_cv_func_readlinkat = no; then
     HAVE_READLINKAT=0
   else
@@ -25,8 +26,17 @@ AC_DEFUN([gl_FUNC_READLINKAT],
              ssize_t readlinkat (int, char const *, char *, size_t);]])],
          [gl_cv_decl_readlinkat_works=yes],
          [gl_cv_decl_readlinkat_works=no])])
-    if test "$gl_cv_decl_readlink_works" != yes; then
-      REPLACE_READLINKAT=1
-    fi
+    # Assume readinkat has the same trailing slash bug as readlink,
+    # as is the case on Mac Os X 10.10
+    case "$gl_cv_func_readlink_works" in
+      *yes)
+        if test "$gl_cv_decl_readlinkat_works" != yes; then
+          REPLACE_READLINKAT=1
+        fi
+        ;;
+      *)
+        REPLACE_READLINKAT=1
+        ;;
+    esac
   fi
 ])