Merge from gnulib

This incorporates:
2015-04-24 file-has-acl: new module, split from acl
2015-04-24 manywarnings: add GCC 5.1 warnings
2015-04-21 lstat: fix cross-compilation 'ln -s' problem
2015-04-15 qacl: Simplify HP-UX acl_nontrivial check
2015-04-15 acl: On Linux, check for acls without libacl
2015-04-14 tempname: avoid unused parameter warnings (trivial)
* lib/acl-internal.c: New file, from gnulib.
* lib/file-has-acl.c: Remove; no longer imported from gnulib.
* lib/acl-internal.h, lib/gnulib.mk, lib/qcopy-acl.c, lib/tempname.c:
* m4/acl.m4, m4/gnulib-comp.m4, m4/lstat.m4, m4/manywarnings.m4:
Update from gnulib.

4 files changed, 82 insertions, 38 deletions

diff --git a/m4/acl.m4 b/m4/acl.m4
index c77f0edd0e7..186353c395b 100644
--- a/m4/acl.m4
+++ b/m4/acl.m4
@@ -1,5 +1,5 @@
 # acl.m4 - check for access control list (ACL) primitives
-# serial 17
+# serial 18
 
 # Copyright (C) 2002, 2004-2015 Free Software Foundation, Inc.
 # This file is free software; the Free Software Foundation
@@ -8,23 +8,29 @@
 
 # Written by Paul Eggert and Jim Meyering.
 
-AC_DEFUN([gl_FUNC_ACL],
+AC_DEFUN([gl_FUNC_ACL_ARG],
 [
+  gl_need_lib_has_acl=
   AC_ARG_ENABLE([acl],
     AS_HELP_STRING([--disable-acl], [do not support ACLs]),
     , [enable_acl=auto])
+])
+
 
+AC_DEFUN([gl_FUNC_ACL],
+[
+  AC_REQUIRE([gl_FUNC_ACL_ARG])
   AC_CHECK_FUNCS_ONCE([fchmod])
   LIB_ACL=
   use_acl=0
-  if test "x$enable_acl" != "xno"; then
+  if test "$enable_acl" != no; then
     dnl On all platforms, the ACL related API is declared in <sys/acl.h>.
     AC_CHECK_HEADERS([sys/acl.h])
     if test $ac_cv_header_sys_acl_h = yes; then
       ac_save_LIBS=$LIBS
 
-      dnl Test for POSIX-draft-like API (Linux, FreeBSD, Mac OS X, IRIX, Tru64).
-      dnl -lacl is needed on Linux, -lpacl is needed on OSF/1.
+      dnl Test for POSIX-draft-like API (GNU/Linux, FreeBSD, Mac OS X,
+      dnl IRIX, Tru64).  -lacl is needed on GNU/Linux, -lpacl on OSF/1.
       if test $use_acl = 0; then
         AC_SEARCH_LIBS([acl_get_file], [acl pacl],
           [if test "$ac_cv_search_acl_get_file" != "none required"; then
@@ -40,7 +46,7 @@ AC_DEFUN([gl_FUNC_ACL],
            # If the acl_get_file bug is detected, don't enable the ACL support.
            gl_ACL_GET_FILE([use_acl=1], [])
            if test $use_acl = 1; then
-             dnl On Linux, additional API is declared in <acl/libacl.h>.
+             dnl On GNU/Linux, an additional API is declared in <acl/libacl.h>.
              AC_CHECK_HEADERS([acl/libacl.h])
              AC_REPLACE_FUNCS([acl_entries])
              AC_CACHE_CHECK([for ACL_FIRST_ENTRY],
@@ -124,13 +130,15 @@ int type = ACL_TYPE_EXTENDED;]])],
 
       LIBS=$ac_save_LIBS
     fi
-    if test "x$enable_acl$use_acl" = "xyes0"; then
+
+    if test "$enable_acl$use_acl" = yes0; then
       AC_MSG_ERROR([ACLs enabled but support not detected])
-    elif test "x$enable_acl$use_acl" = "xauto0"; then
+    elif test "$enable_acl$use_acl" = auto0; then
       AC_MSG_WARN([libacl development library was not found or not usable.])
       AC_MSG_WARN([AC_PACKAGE_NAME will be built without ACL support.])
     fi
   fi
+  test $gl_need_lib_has_acl && LIB_HAS_ACL=$LIB_ACL
   AC_SUBST([LIB_ACL])
   AC_DEFINE_UNQUOTED([USE_ACL], [$use_acl],
     [Define to nonzero if you want access control list support.])
@@ -139,7 +147,7 @@ int type = ACL_TYPE_EXTENDED;]])],
 ])
 
 # gl_ACL_GET_FILE(IF-WORKS, IF-NOT)
-# -------------------------------------
+# ---------------------------------
 # If 'acl_get_file' works (does not have a particular bug),
 # run IF-WORKS, otherwise, IF-NOT.
 # When building natively, test for a Darwin 8.7.0 bug, whereby acl_get_file
@@ -166,3 +174,24 @@ AC_DEFUN([gl_ACL_GET_FILE],
         fi])])
   AS_IF([test "$gl_cv_func_working_acl_get_file" != no], [$1], [$2])
 ])
+
+# On GNU/Linux, testing if a file has an acl can be done with the getxattr
+# syscall which doesn't require linking against additional libraries.
+AC_DEFUN([gl_FILE_HAS_ACL],
+[
+  AC_REQUIRE([gl_FUNC_ACL_ARG])
+  if test "$enable_acl" != no; then
+    AC_CHECK_HEADERS([linux/xattr.h],
+      [AC_CHECK_HEADERS([sys/xattr.h],
+         [AC_CHECK_FUNCS([getxattr])])])
+  fi
+  if test "$ac_cv_header_sys_xattr_h,$ac_cv_header_linux_xattr_h,$ac_cv_func_getxattr" = yes,yes,yes; then
+    LIB_HAS_ACL=
+  else
+    dnl Set gl_need_lib_has_acl to a nonempty value, so that any
+    dnl later gl_FUNC_ACL call will set LIB_HAS_ACL=$LIB_ACL.
+    gl_need_lib_has_acl=1
+    LIB_HAS_ACL=$LIB_ACL
+  fi
+  AC_SUBST([LIB_HAS_ACL])
+])
diff --git a/m4/gnulib-comp.m4 b/m4/gnulib-comp.m4
index f32a4ddca5c..06636cfe76c 100644
--- a/m4/gnulib-comp.m4
+++ b/m4/gnulib-comp.m4
@@ -818,6 +818,7 @@ AC_DEFUN([gl_FILE_LIST], [
   build-aux/snippet/warn-on-use.h
   build-aux/update-copyright
   lib/acl-errno-valid.c
+  lib/acl-internal.c
   lib/acl-internal.h
   lib/acl.h
   lib/acl_entries.c
@@ -856,7 +857,6 @@ AC_DEFUN([gl_FILE_LIST], [
   lib/fcntl.in.h
   lib/fdatasync.c
   lib/fdopendir.c
-  lib/file-has-acl.c
   lib/filemode.c
   lib/filemode.h
   lib/fpending.c
diff --git a/m4/lstat.m4 b/m4/lstat.m4
index f6c7dd1ce44..adf752c0dfa 100644
--- a/m4/lstat.m4
+++ b/m4/lstat.m4
@@ -1,4 +1,4 @@
-# serial 26
+# serial 27
 
 # Copyright (C) 1997-2001, 2003-2015 Free Software Foundation, Inc.
 #
@@ -37,30 +37,28 @@ AC_DEFUN([gl_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK],
     [gl_cv_func_lstat_dereferences_slashed_symlink],
     [rm -f conftest.sym conftest.file
      echo >conftest.file
-     if test "$as_ln_s" = "ln -s" && ln -s conftest.file conftest.sym; then
-       AC_RUN_IFELSE(
-         [AC_LANG_PROGRAM(
-            [AC_INCLUDES_DEFAULT],
-            [[struct stat sbuf;
-              /* Linux will dereference the symlink and fail, as required by
-                 POSIX.  That is better in the sense that it means we will not
-                 have to compile and use the lstat wrapper.  */
-              return lstat ("conftest.sym/", &sbuf) == 0;
-            ]])],
-         [gl_cv_func_lstat_dereferences_slashed_symlink=yes],
-         [gl_cv_func_lstat_dereferences_slashed_symlink=no],
-         [case "$host_os" in
-                    # Guess yes on glibc systems.
-            *-gnu*) gl_cv_func_lstat_dereferences_slashed_symlink="guessing yes" ;;
-                    # If we don't know, assume the worst.
-            *)      gl_cv_func_lstat_dereferences_slashed_symlink="guessing no" ;;
-          esac
-         ])
-     else
-       # If the 'ln -s' command failed, then we probably don't even
-       # have an lstat function.
-       gl_cv_func_lstat_dereferences_slashed_symlink="guessing no"
-     fi
+     AC_RUN_IFELSE(
+       [AC_LANG_PROGRAM(
+          [AC_INCLUDES_DEFAULT],
+          [[struct stat sbuf;
+            if (symlink ("conftest.file", "conftest.sym") != 0)
+              return 1;
+            /* Linux will dereference the symlink and fail, as required by
+               POSIX.  That is better in the sense that it means we will not
+               have to compile and use the lstat wrapper.  */
+            return lstat ("conftest.sym/", &sbuf) == 0;
+          ]])],
+       [gl_cv_func_lstat_dereferences_slashed_symlink=yes],
+       [gl_cv_func_lstat_dereferences_slashed_symlink=no],
+       [case "$host_os" in
+          *-gnu*)
+            # Guess yes on glibc systems.
+            gl_cv_func_lstat_dereferences_slashed_symlink="guessing yes" ;;
+          *)
+            # If we don't know, assume the worst.
+            gl_cv_func_lstat_dereferences_slashed_symlink="guessing no" ;;
+        esac
+       ])
      rm -f conftest.sym conftest.file
     ])
   case "$gl_cv_func_lstat_dereferences_slashed_symlink" in
diff --git a/m4/manywarnings.m4 b/m4/manywarnings.m4
index 44da98e38da..b4e38d94463 100644
--- a/m4/manywarnings.m4
+++ b/m4/manywarnings.m4
@@ -108,12 +108,13 @@ AC_DEFUN([gl_MANYWARN_ALL_GCC],
     -Waddress \
     -Waggressive-loop-optimizations \
     -Wall \
-    -Warray-bounds \
     -Wattributes \
     -Wbad-function-cast \
+    -Wbool-compare \
     -Wbuiltin-macro-redefined \
     -Wcast-align \
     -Wchar-subscripts \
+    -Wchkp \
     -Wclobbered \
     -Wcomment \
     -Wcomments \
@@ -122,7 +123,10 @@ AC_DEFUN([gl_MANYWARN_ALL_GCC],
     -Wdate-time \
     -Wdeprecated \
     -Wdeprecated-declarations \
+    -Wdesignated-init \
     -Wdisabled-optimization \
+    -Wdiscarded-array-qualifiers \
+    -Wdiscarded-qualifiers \
     -Wdiv-by-zero \
     -Wdouble-promotion \
     -Wempty-body \
@@ -133,6 +137,7 @@ AC_DEFUN([gl_MANYWARN_ALL_GCC],
     -Wformat-extra-args \
     -Wformat-nonliteral \
     -Wformat-security \
+    -Wformat-signedness \
     -Wformat-y2k \
     -Wformat-zero-length \
     -Wfree-nonheap-object \
@@ -140,15 +145,19 @@ AC_DEFUN([gl_MANYWARN_ALL_GCC],
     -Wimplicit \
     -Wimplicit-function-declaration \
     -Wimplicit-int \
+    -Wincompatible-pointer-types \
     -Winit-self \
     -Winline \
+    -Wint-conversion \
     -Wint-to-pointer-cast \
     -Winvalid-memory-model \
     -Winvalid-pch \
     -Wjump-misses-init \
+    -Wlogical-not-parentheses \
     -Wlogical-op \
     -Wmain \
     -Wmaybe-uninitialized \
+    -Wmemset-transposed-args \
     -Wmissing-braces \
     -Wmissing-declarations \
     -Wmissing-field-initializers \
@@ -159,6 +168,7 @@ AC_DEFUN([gl_MANYWARN_ALL_GCC],
     -Wnarrowing \
     -Wnested-externs \
     -Wnonnull \
+    -Wodr \
     -Wold-style-declaration \
     -Wold-style-definition \
     -Wopenmp-simd \
@@ -176,6 +186,9 @@ AC_DEFUN([gl_MANYWARN_ALL_GCC],
     -Wreturn-type \
     -Wsequence-point \
     -Wshadow \
+    -Wshift-count-negative \
+    -Wshift-count-overflow \
+    -Wsizeof-array-argument \
     -Wsizeof-pointer-memaccess \
     -Wstack-protector \
     -Wstrict-aliasing \
@@ -185,7 +198,10 @@ AC_DEFUN([gl_MANYWARN_ALL_GCC],
     -Wsuggest-attribute=format \
     -Wsuggest-attribute=noreturn \
     -Wsuggest-attribute=pure \
+    -Wsuggest-final-methods \
+    -Wsuggest-final-types \
     -Wswitch \
+    -Wswitch-bool \
     -Wswitch-default \
     -Wsync-nand \
     -Wsystem-headers \
@@ -217,8 +233,9 @@ AC_DEFUN([gl_MANYWARN_ALL_GCC],
     gl_manywarn_set="$gl_manywarn_set $gl_manywarn_item"
   done
 
-  # gcc --help=warnings outputs an unusual form for this option; list
-  # it here so that the above 'comm' command doesn't report a false match.
+  # gcc --help=warnings outputs an unusual form for these options; list
+  # them here so that the above 'comm' command doesn't report a false match.
+  gl_manywarn_set="$gl_manywarn_set -Warray-bounds=2"
   gl_manywarn_set="$gl_manywarn_set -Wnormalized=nfc"
 
   # These are needed for older GCC versions.