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[libvirt] [PATCH] maint: update to latest gnulib

The latest mingw headers on Fedora 19 fail to build with gnulib
without an update.

Meanwhile, now that upstream gnulib has better handling of -W
probing for clang, we can drop some of our own solutions in
favor of upstream; thus this reverts commit c1634100, "Correctly
detect warning flags with clang".

* .gnulib: Update to latest, for mingw and clang.

Signed-off-by: Eric Blake <eblake redhat com>

Pushing under the build-breaker rule.

* .gnulib a363f4e...f40e61e (41):
  > update from texinfo
  > ignore-value: port to gcc -pedantic
  > extern-inline: port to gcc -std=c89
  > doc: document extern-inline
  > doc: chatter less
  > fflush, fseeko: port to musl cross-compiles
  > msvc-inval: port to mingw-w64
  > getcwd-lgpl: port to Tru64
  > autoupdate
  > tests: port large-fd POSIX spawn tests to OS X
  > autoupdate
  > tests/nap.h: use an adaptive delay to avoid ctime update issues
  > sig2str: port to C++
  > docs: mention cygwin shortcoming in <sys/un.h>
  > vasnprintf: silence mingw compiler warning
  > c-ctype, regex, verify: port to gcc -std=c90 -pedantic
  > regex: adapt to locking regime instead of depending on pthread
  > getgroups: document portability issues
  > test-lchown, test-chown: also skip test if lchown/chown fails with EPERM
  > regex: fix dfa race in multithreaded uses
  > malloca: port to compilers that reject size-zero arrays
  > parse-datetime, tests: don't use "string" + int
  > argmatch: port to C++
  > argp: typo fix
  > autoupdate
  > manywarnings: update for GCC 4.8.0
  > spawn-tests, sys_socket-tests, sys_wait-tests: port to clang
  > getaddrinfo-tests: port --enable-gcc-warnings to clang
  > thread: port --enable-gcc-warnings to clang
  > stdio: use __REDIRECT for fwrite, fwrite_unlocked
  > stdio: port --enable-gcc-warnings to clang
  > sig2str: port --enable-gcc-warnings to clang
  > obstack: port --enable-gcc-warnings to clang
  > memchr2: port --enable-gcc-warnings to clang
  > mbsstr: port --enable-gcc-warnings to clang
  > malloca: port --enable-gcc-warnings to clang
  > inttostr: port --enable-gcc-warnings to clang
  > warnings: port to clang
  > quotearg: do not read beyond end of buffer
  > lock: work around pthread recursive mutexes bug in Mac OS X 10.6
  > mkdir-p: remove assumptions about umask and mode

 .gnulib                     |  2 +-
 m4/virt-compile-warnings.m4 | 22 ----------------------
 2 files changed, 1 insertion(+), 23 deletions(-)

diff --git a/.gnulib b/.gnulib
index a363f4e..f40e61e 160000
--- a/.gnulib
+++ b/.gnulib
@@ -1 +1 @@
-Subproject commit a363f4ed4a0e69187c97686ac44502c49c7f4b3d
+Subproject commit f40e61ea0c4940b027aade7dd48948aa93f133a4
diff --git a/m4/virt-compile-warnings.m4 b/m4/virt-compile-warnings.m4
index ce4e244..c6794b7 100644
--- a/m4/virt-compile-warnings.m4
+++ b/m4/virt-compile-warnings.m4
     # gcc 4.4.6 complains this is C++ only; gcc 4.7.0 implies this from -Wall
     dontwarn="$dontwarn -Wenum-compare"

-    # clang rather horribly ignores unknown warning flags by
-    # default. Thus to get gl_WARN_ADD to reliably detect
-    # flags, we need to set '-Werror -Wunknown-warning-option'
-    # in CFLAGS while probing support
-    orig_CFLAGS="$CFLAGS"
-    gl_WARN_ADD([-Wunknown-warning-option])
-    if test -n "$WARN_CFLAGS" ; then
-        WARN_CFLAGS=
-        CFLAGS="-Werror -Wunknown-warning-option $CFLAGS"
-    fi
     # gcc 4.2 treats attribute(format) as an implicit attribute(nonnull),
     # which triggers spurious warnings for our usage
     AC_CACHE_CHECK([whether gcc -Wformat allows NULL strings],
@@ -197,13 +185,6 @@ AC_DEFUN([LIBVIRT_COMPILE_WARNINGS],[
        dnl gl_WARN_ADD([-fstack-protector])
-       dnl Even though it supports it, clang complains about
-       dnl use of --param=ssp-buffer-size=4 unless used with
-       dnl the -c arg. It doesn't like it when used with args
-       dnl that just link together .o files. Unfortunately
-       dnl we can't avoid that with automake, so we must turn
-       dnl off the following clang specific warning
-       gl_WARN_ADD([-Wno-unused-command-line-argument])
        dnl FreeBSD ships old gcc 4.2.1 which doesn't handle
        [Define to 1 if gcc -Wlogical-op reports false positives on strchr])
-    # Remove stuff we set for clang
-    CFLAGS="$orig_CFLAGS"

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