Move gnulib to top level

This patch moves the gdb/gnulib subdirectory to the top level.

It adjusts the top-level build system to build gnulib when necessary,
and changes gdb to use this.  However, gdbserver still builds its own
copy of gnulib, just from the new source location.

A small hack was needed to ensure that gnulib is only built when gdb
is enabled.  The Makefile only provides an ordering -- the directory
must be mentioned in configdirs to actually be compiled at all.

Most of the patch is just a "git mv" of gnulib, though a few minor
path adjustments were needed in some files there.

Tested by the buildbot.

ChangeLog
2019-06-14  Tom Tromey  <tom@tromey.com>

	* MAINTAINERS: Add gnulib.
	* gnulib: New directory, move from gdb/gnulib.
	* configure.ac (host_libs): Add gnulib.
	* configure: Rebuild.
	* Makefile.def (host_modules, dependencies): Add gnulib.
	* Makefile.in: Rebuild.

gdb/ChangeLog
2019-06-14  Tom Tromey  <tom@tromey.com>

	* gnulib: Move directory to top-level.
	* configure.ac: Don't configure gnulib.
	* configure: Rebuild.
	* common/common-defs.h: Use new path to gnulib.
	* Makefile.in (GNULIB_BUILDDIR): Now ../gnulib.
	(GNULIB_H): Remove.
	(INCGNU): Look in new gnulib location.
	(HFILES_NO_SRCDIR): Remove gnulib files.
	(SUBDIR, REQUIRED_SUBDIRS): Remove gnulib.
	(generated_files): Remove GNULIB_H.
	($(LIBGNU), all-lib): Remove targets.
	(distclean): Don't mention GNULIB_BUILDDIR.
	($(GNULIB_BUILDDIR)/Makefile): Remove target.

gdb/gdbserver/ChangeLog
2019-06-14  Tom Tromey  <tom@tromey.com>

	* configure.ac: Use new path to gnulib.
	* configure: Rebuild.
	* Makefile.in (INCGNU, $(GNULIB_BUILDDIR)/Makefile): Use new path
	to gnulib.

gnulib/ChangeLog
2019-06-14  Tom Tromey  <tom@tromey.com>

	* update-gnulib.sh: Adjust paths.
	* Makefile.in: Adjust paths.
	* configure.ac: Adjust paths.  Use ACX_LARGEFILE.
	* configure: Rebuild.

1 files changed, 77 insertions, 0 deletions

diff --git a/gnulib/import/m4/socklen.m4 b/gnulib/import/m4/socklen.m4
new file mode 100644
index 00000000000..634c43a35c1
--- /dev/null
+++ b/gnulib/import/m4/socklen.m4
@@ -0,0 +1,77 @@
+# socklen.m4 serial 10
+dnl Copyright (C) 2005-2007, 2009-2016 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+dnl From Albert Chin, Windows fixes from Simon Josefsson.
+
+dnl Check for socklen_t: historically on BSD it is an int, and in
+dnl POSIX 1g it is a type of its own, but some platforms use different
+dnl types for the argument to getsockopt, getpeername, etc.:
+dnl HP-UX 10.20, IRIX 6.5, OSF/1 4.0, Interix 3.5, BeOS.
+dnl So we have to test to find something that will work.
+
+AC_DEFUN([gl_TYPE_SOCKLEN_T],
+  [AC_REQUIRE([gl_CHECK_SOCKET_HEADERS])dnl
+   AC_CHECK_TYPE([socklen_t], ,
+     [AC_MSG_CHECKING([for socklen_t equivalent])
+      AC_CACHE_VAL([gl_cv_socklen_t_equiv],
+        [# Systems have either "struct sockaddr *" or
+         # "void *" as the second argument to getpeername
+         gl_cv_socklen_t_equiv=
+         for arg2 in "struct sockaddr" void; do
+           for t in int size_t "unsigned int" "long int" "unsigned long int"; do
+             AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
+                 [[#include <sys/types.h>
+                   #include <sys/socket.h>
+
+                   int getpeername (int, $arg2 *, $t *);]],
+                 [[$t len;
+                  getpeername (0, 0, &len);]])],
+               [gl_cv_socklen_t_equiv="$t"])
+             test "$gl_cv_socklen_t_equiv" != "" && break
+           done
+           test "$gl_cv_socklen_t_equiv" != "" && break
+         done
+      ])
+      if test "$gl_cv_socklen_t_equiv" = ""; then
+        AC_MSG_ERROR([Cannot find a type to use in place of socklen_t])
+      fi
+      AC_MSG_RESULT([$gl_cv_socklen_t_equiv])
+      AC_DEFINE_UNQUOTED([socklen_t], [$gl_cv_socklen_t_equiv],
+        [type to use in place of socklen_t if not defined])],
+     [gl_SOCKET_HEADERS])])
+
+dnl On mingw32, socklen_t is in ws2tcpip.h ('int'), so we try to find
+dnl it there too.  But on Cygwin, wc2tcpip.h must not be included.  Users
+dnl of this module should use the same include pattern as gl_SOCKET_HEADERS.
+dnl When you change this macro, keep also in sync:
+dnl   - gl_CHECK_SOCKET_HEADERS,
+dnl   - the Include section of modules/socklen.
+AC_DEFUN([gl_SOCKET_HEADERS],
+[
+/* <sys/types.h> is not needed according to POSIX, but the
+   <sys/socket.h> in i386-unknown-freebsd4.10 and
+   powerpc-apple-darwin5.5 required it. */
+#include <sys/types.h>
+#if HAVE_SYS_SOCKET_H
+# include <sys/socket.h>
+#elif HAVE_WS2TCPIP_H
+# include <ws2tcpip.h>
+#endif
+])
+
+dnl Tests for the existence of the header for socket facilities.
+dnl Defines the C macros HAVE_SYS_SOCKET_H, HAVE_WS2TCPIP_H.
+dnl This macro must match gl_SOCKET_HEADERS.
+AC_DEFUN([gl_CHECK_SOCKET_HEADERS],
+  [AC_CHECK_HEADERS_ONCE([sys/socket.h])
+   if test $ac_cv_header_sys_socket_h = no; then
+     dnl We cannot use AC_CHECK_HEADERS_ONCE here, because that would make
+     dnl the check for those headers unconditional; yet cygwin reports
+     dnl that the headers are present but cannot be compiled (since on
+     dnl cygwin, all socket information should come from sys/socket.h).
+     AC_CHECK_HEADERS([ws2tcpip.h])
+   fi
+  ])