Integrate GNU poke in GDBusers/jemarch/poke-gdb

This patch integrates GNU poke (http://jemarch.net/poke) in GDB by
mean of libpoke.  It allows the GDB user to execute Poke code from
within the debugger with access to the target memory, types and
values.

How this stuff works:

- GDB links with libpoke.so and uses the interface in libpoke.h.
  This is also how the GNU poke application (the command-line
  editor) is implemented.

- There are three commands:

  poke STR
  poke-add-type EXPR
  poke-add-types REGEXP
  poke-dump-types

  All three commands make sure to start the poke incremental
  compiler if it isn't running already.

- Access to the target's memory is provided by GDB by installing
  a Foreign IO device in the incremental compiler.  This is
  `iod_if' in poke.c.

- Access to the terminal is provided by GDB by providing a
  pk_term_if implementation to the incremental compiler.  This is
  `poke_term_if' in poke.c.

- Access to GDB values is provided by GDB by installing an alien
  token handler in the incremental compiler.  This is
  `poke_alien_token_handler' in poke.c.

gdb/ChangeLog:

2021-05-10  Jose E. Marchesi  <jose.marchesi@oracle.com>

	* configure.ac: Support --enable-poke.
	* configure: Regenerate.
	* Makefile.in (POKE_OBS): Define based on @POKE_OBS@.
	(DEPFILES): Add POKE_OBS.
	* poke.c: New file.

gdb/doc/ChangeLog:

2021-05-10  Jose E. Marchesi  <jose.marchesi@oracle.com>

	* Makefile.in (GDB_DOC_FILES): Add poke.texi.
	* poke.texi: New file.
	* gdb.texinfo (Data): Add meny entry for Poke and @include poke.texi.

2 files changed, 20 insertions, 3 deletions

diff --git a/intl/aclocal.m4 b/intl/aclocal.m4
index 0a42b42..abe4923 100644
--- a/intl/aclocal.m4
+++ b/intl/aclocal.m4
@@ -1,6 +1,6 @@
-# generated automatically by aclocal 1.15.1 -*- Autoconf -*-
+# generated automatically by aclocal 1.16.3 -*- Autoconf -*-
 
-# Copyright (C) 1996-2017 Free Software Foundation, Inc.
+# Copyright (C) 1996-2020 Free Software Foundation, Inc.
 
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
diff --git a/intl/configure b/intl/configure
index e75f072..7f370f2 100755
--- a/intl/configure
+++ b/intl/configure
@@ -696,6 +696,7 @@ infodir
 docdir
 oldincludedir
 includedir
+runstatedir
 localstatedir
 sharedstatedir
 sysconfdir
@@ -775,6 +776,7 @@ datadir='${datarootdir}'
 sysconfdir='${prefix}/etc'
 sharedstatedir='${prefix}/com'
 localstatedir='${prefix}/var'
+runstatedir='${localstatedir}/run'
 includedir='${prefix}/include'
 oldincludedir='/usr/include'
 docdir='${datarootdir}/doc/${PACKAGE}'
@@ -1027,6 +1029,15 @@ do
   | -silent | --silent | --silen | --sile | --sil)
     silent=yes ;;
 
+  -runstatedir | --runstatedir | --runstatedi | --runstated \
+  | --runstate | --runstat | --runsta | --runst | --runs \
+  | --run | --ru | --r)
+    ac_prev=runstatedir ;;
+  -runstatedir=* | --runstatedir=* | --runstatedi=* | --runstated=* \
+  | --runstate=* | --runstat=* | --runsta=* | --runst=* | --runs=* \
+  | --run=* | --ru=* | --r=*)
+    runstatedir=$ac_optarg ;;
+
   -sbindir | --sbindir | --sbindi | --sbind | --sbin | --sbi | --sb)
     ac_prev=sbindir ;;
   -sbindir=* | --sbindir=* | --sbindi=* | --sbind=* | --sbin=* \
@@ -1164,7 +1175,7 @@ fi
 for ac_var in	exec_prefix prefix bindir sbindir libexecdir datarootdir \
 		datadir sysconfdir sharedstatedir localstatedir includedir \
 		oldincludedir docdir infodir htmldir dvidir pdfdir psdir \
-		libdir localedir mandir
+		libdir localedir mandir runstatedir
 do
   eval ac_val=\$$ac_var
   # Remove trailing slashes.
@@ -1317,6 +1328,7 @@ Fine tuning of the installation directories:
   --sysconfdir=DIR        read-only single-machine data [PREFIX/etc]
   --sharedstatedir=DIR    modifiable architecture-independent data [PREFIX/com]
   --localstatedir=DIR     modifiable single-machine data [PREFIX/var]
+  --runstatedir=DIR       modifiable per-process data [LOCALSTATEDIR/run]
   --libdir=DIR            object code libraries [EPREFIX/lib]
   --includedir=DIR        C header files [PREFIX/include]
   --oldincludedir=DIR     C header files for non-gcc [/usr/include]
@@ -4656,6 +4668,8 @@ main ()
     if (*(data + i) != *(data3 + i))
       return 14;
   close (fd);
+  free (data);
+  free (data3);
   return 0;
 }
 _ACEOF
@@ -6857,6 +6871,9 @@ case "${host}" in
 	# sets the default TLS model and affects inlining.
 	PICFLAG=-fPIC
 	;;
+    loongarch*-*-*)
+	PICFLAG=-fpic
+	;;
     mips-sgi-irix6*)
 	# PIC is the default.
 	;;