gnu: gdb: Remove Hurd patch.

The patch was useful for GDB 11 on the previous Hurd version that was
used; it's unnecessary on GDB 12 and GDB 11 has other build issues on
the current GNU/Hurd.

This change fixes "guix build gdb-minimal --target=i586-pc-gnu".

* gnu/packages/patches/gdb-fix-gnu-nat-build.patch: Remove.
* gnu/local.mk (dist_patch_DATA): Remove it.
* gnu/packages/gdb.scm (gdb-11)[arguments]: Remove 'patch-gdb/hurd' phase.
[inputs]: Remove "hurd-build.patch" input.
[supported-systems]: New field.
(gdb-12)[supported-systems]: New field.

3 files changed, 10 insertions, 266 deletions

diff --git a/gnu/local.mk b/gnu/local.mk
index 9372ff0119..7ec3af9c46 100644
--- a/gnu/local.mk
+++ b/gnu/local.mk
@@ -1191,7 +1191,6 @@ dist_patch_DATA =						\
   %D%/packages/patches/gd-fix-tests-on-i686.patch		\
   %D%/packages/patches/gd-brect-bounds.patch			\
   %D%/packages/patches/gd-Revert-fix-303-gdlib.pc.patch		\
-  %D%/packages/patches/gdb-fix-gnu-nat-build.patch		\
   %D%/packages/patches/gdm-default-session.patch		\
   %D%/packages/patches/gdm-elogind-support.patch		\
   %D%/packages/patches/gdm-remove-hardcoded-xwayland-path.patch	\
diff --git a/gnu/packages/gdb.scm b/gnu/packages/gdb.scm
index 493b30f841..b9fbf1480a 100644
--- a/gnu/packages/gdb.scm
+++ b/gnu/packages/gdb.scm
@@ -72,12 +72,6 @@
                                        "gdbsupport/pathstuff.cc")
                           (("\"/bin/sh\"")
                            (format #f "~s" sh))))))
-                  ,@(if (hurd-target?)
-                        '((add-after 'unpack 'patch-gdb/hurd
-                            (lambda* (#:key inputs #:allow-other-keys)
-                              (let ((patch (assoc-ref inputs "hurd-build.patch")))
-                                (invoke "patch" "-p1" "--force" "-i" patch)))))
-                        '())
                   (add-after 'configure 'post-configure
                     (lambda _
                       (for-each patch-makefile-SHELL
@@ -119,9 +113,7 @@
 
        ;; The Hurd needs -lshouldbeinlibc.
        ,@(if (hurd-target?)
-             `(("hurd" ,hurd)
-               ("hurd-build.patch"
-                ,(search-patch "gdb-fix-gnu-nat-build.patch")))
+             `(("hurd" ,hurd))
              '())))
     (native-inputs
      `(("texinfo" ,texinfo)
@@ -148,7 +140,11 @@ doing while it runs or what it was doing just before a crash.  It allows you
 to specify the runtime conditions, to define breakpoints, and to change how
 the program is running to try to fix bugs.  It can be used to debug programs
 written in C, C++, Ada, Objective-C, Pascal and more.")
-    (license gpl3+)))
+    (license gpl3+)
+
+    ;; GDB 11 now fails to build on GNU/Hurd (undefined references to process
+    ;; RPC stubs).
+    (supported-systems (fold delete %supported-systems %hurd-systems))))
 
 (define-public gdb-12
   (package
@@ -160,7 +156,10 @@ written in C, C++, Ada, Objective-C, Pascal and more.")
                                   version ".tar.xz"))
               (sha256
                (base32
-                "1vczsqcbh5y0gx7qrclpna0qzx26sk7lra6y8qzxam1biyzr65qf"))))))
+                "1vczsqcbh5y0gx7qrclpna0qzx26sk7lra6y8qzxam1biyzr65qf"))))
+
+    ;; GDB 12 builds fine on GNU/Hurd.
+    (supported-systems %supported-systems)))
 
 (define-public gdb
   ;; This is the fixed version that packages depend on.  Update it rarely
diff --git a/gnu/packages/patches/gdb-fix-gnu-nat-build.patch b/gnu/packages/patches/gdb-fix-gnu-nat-build.patch
deleted file mode 100644
index b0249d9cec..0000000000
--- a/gnu/packages/patches/gdb-fix-gnu-nat-build.patch
+++ /dev/null
@@ -1,254 +0,0 @@
-Fix build on the Hurd.
-
-Patch #1 taken from upstream
-
-    https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=a1700a3199d31910b87cd7db3c394ddd091cfcde
-
-Patch #2 taken from upstream mailing list
-
-    https://sourceware.org/pipermail/gdb/2021-November/049777.html
-
-Patch #3 sent to upstream
-
-    https://sourceware.org/pipermail/gdb/2021-November/049788.html
-
-From 30d89407ad6bb62fafc72fa9c547c2d7ff371401 Mon Sep 17 00:00:00 2001
-From: Simon Marchi <simon.marchi@polymtl.ca>
-Date: Wed, 3 Nov 2021 15:09:19 -0400
-Subject: [PATCH 1/3] gdb: fix gnu-nat build
-Content-Transfer-Encoding: 8bit
-Content-Type: text/plain; charset=UTF-8
-
-When building gnu-nat.c, we get:
-
-      CXX    gnu-nat.o
-    gnu-nat.c: In member function 'virtual void gnu_nat_target::create_inferior(const char*, const string&, char**, int)':
-    gnu-nat.c:2117:13: error: 'struct inf' has no member named 'target_is_pushed'
-     2117 |   if (!inf->target_is_pushed (this))
-          |             ^~~~~~~~~~~~~~~~
-    gnu-nat.c:2118:10: error: 'struct inf' has no member named 'push_target'
-     2118 |     inf->push_target (this);
-          |          ^~~~~~~~~~~
-
-This is because of a confusion between the generic `struct inferior`
-variable and the gnu-nat-specific `struct inf` variable.  Fix by
-referring to `inferior`, not `inf`.
-
-Adjust the comment on top of `struct inf` to clarify the purpose of that
-type.
-
-Co-Authored-By: Andrea Monaco <andrea.monaco@autistici.org>
-Change-Id: I2fe2f7f6ef61a38d79860fd262b08835c963fc77
----
- gdb/gnu-nat.c | 6 +++---
- 1 file changed, 3 insertions(+), 3 deletions(-)
-
-diff --git a/gdb/gnu-nat.c b/gdb/gnu-nat.c
-index 67ce00e9c30..ab539b4d8b4 100644
---- a/gdb/gnu-nat.c
-+++ b/gdb/gnu-nat.c
-@@ -149,7 +149,7 @@ struct inf_wait
-     int suppress;		/* Something trivial happened.  */
-   };
- 
--/* The state of an inferior.  */
-+/* Further Hurd-specific state of an inferior.  */
- struct inf
-   {
-     /* Fields describing the current inferior.  */
-@@ -2114,8 +2114,8 @@ gnu_nat_target::create_inferior (const char *exec_file,
- 
-   inf_debug (inf, "creating inferior");
- 
--  if (!inf->target_is_pushed (this))
--    inf->push_target (this);
-+  if (!inferior->target_is_pushed (this))
-+    inferior->push_target (this);
- 
-   pid = fork_inferior (exec_file, allargs, env, gnu_ptrace_me,
- 		       NULL, NULL, NULL, NULL);
-From ebc0837f4693232f74eb2cc3033515b18a8f0900 Mon Sep 17 00:00:00 2001
-From: "Jan (janneke) Nieuwenhuizen" <janneke@gnu.org>
-Date: Mon, 22 Nov 2021 07:47:28 +0100
-Subject: [PATCH 2/3] gdb: gnu-nat.c: port-rights.
-Content-Transfer-Encoding: 8bit
-Content-Type: text/plain; charset=UTF-8
-
-Taken from:
-
-    https://sourceware.org/pipermail/gdb/2021-November/049777.html
----
- gdb/gnu-nat.c | 18 ++++++++++--------
- 1 file changed, 10 insertions(+), 8 deletions(-)
-
-diff --git a/gdb/gnu-nat.c b/gdb/gnu-nat.c
-index ab539b4d8b4..8cd876b21d0 100644
---- a/gdb/gnu-nat.c
-+++ b/gdb/gnu-nat.c
-@@ -3292,15 +3292,17 @@ This is the same as setting `task pause', `exceptions', and\n\
- 	    _("Show information about the task's send rights."));
-   add_info ("receive-rights", info_recv_rights_cmd,
- 	    _("Show information about the task's receive rights."));
--  add_info ("port-rights", info_port_rights_cmd,
--	    _("Show information about the task's port rights."));
--  add_info ("port-sets", info_port_sets_cmd,
--	    _("Show information about the task's port sets."));
-+  cmd_list_element *port_rights_cmd =
-+    add_info ("port-rights", info_port_rights_cmd,
-+             _("Show information about the task's port rights."));
-+  cmd_list_element *port_sets_cmd =
-+    add_info ("port-sets", info_port_sets_cmd,
-+             _("Show information about the task's port sets."));
-   add_info ("dead-names", info_dead_names_cmd,
--	    _("Show information about the task's dead names."));
--  add_info_alias ("ports", "port-rights", 1);
--  add_info_alias ("port", "port-rights", 1);
--  add_info_alias ("psets", "port-sets", 1);
-+            _("Show information about the task's dead names."));
-+  add_info_alias ("ports", port_rights_cmd, 1);
-+  add_info_alias ("port", port_rights_cmd, 1);
-+  add_info_alias ("psets", port_sets_cmd, 1);
- }
- 
- 
-From e8df985cdd95e4808c390e226a0e852d23c502f9 Mon Sep 17 00:00:00 2001
-From: "Jan (janneke) Nieuwenhuizen" <janneke@gnu.org>
-Date: Mon, 22 Nov 2021 08:22:15 +0100
-Subject: [PATCH 3/3] gdb: More compile fixes for gnu-nat.c.
-MIME-Version: 1.0
-Content-Type: text/plain; charset=UTF-8
-Content-Transfer-Encoding: 8bit
-Content-Transfer-Encoding: 8bit
-Content-Type: text/plain; charset=UTF-8
-
-This fixes compile errors like
-
-    ../../gdb-11.1/gdb/gnu-nat.c: In function ‘void add_task_commands()’:
-    ../../gdb-11.1/gdb/gnu-nat.c:3204:17: error: no matching function for call to ‘add_cmd(const char [8], command_class, cmd_list_element*&, char*, cmd_list_element**)’
-     3204 |         &setlist);
-          |                 ^
-    In file included from ../../gdb-11.1/gdb/completer.h:21,
-                     from ../../gdb-11.1/gdb/symtab.h:36,
-                     from ../../gdb-11.1/gdb/infrun.h:21,
-                     from ../../gdb-11.1/gdb/target.h:42,
-                     from ../../gdb-11.1/gdb/inf-child.h:23,
-                     from ../../gdb-11.1/gdb/gnu-nat.h:38,
-                     from ../../gdb-11.1/gdb/gnu-nat.c:24:
-    ../../gdb-11.1/gdb/command.h:160:33: note: candidate: ‘cmd_list_element* add_cmd(const char*, command_class, void (*)(const char*, int), const char*, cmd_list_element**)’
-      160 | extern struct cmd_list_element *add_cmd (const char *, enum command_class,
-          |                                 ^~~~~~~
-    ../../gdb-11.1/gdb/command.h:161:30: note:   no known conversion for argument 3 from ‘cmd_list_element*’ to ‘void (*)(const char*, int)’
-      161 |       cmd_const_cfunc_ftype *fun,
-          |       ~~~~~~~~~~~~~~~~~~~~~~~^~~
-    ../../gdb-11.1/gdb/command.h:167:33: note: candidate: ‘cmd_list_element* add_cmd(const char*, command_class, const char*, cmd_list_element**)’
-      167 | extern struct cmd_list_element *add_cmd (const char *, enum command_class,
-          |                                 ^~~~~~~
-    ../../gdb-11.1/gdb/command.h:167:33: note:   candidate expects 4 arguments, 5 provided
-    ../../gdb-11.1/gdb/gnu-nat.c:3210:18: error: no matching function for call to ‘add_cmd(const char [8], command_class, cmd_list_element*&, char*, cmd_list_element**)’
-     3210 |         &showlist);
-          |                  ^
-
-* gdb/gnu-nat.c (add_task_commands): Use a fresh variable instead of
-shadowing set_signals_cmd etc.
-(add_thread_commands): Likewise.
----
- gdb/gnu-nat.c | 33 +++++++++++++++++----------------
- 1 file changed, 17 insertions(+), 16 deletions(-)
-
-diff --git a/gdb/gnu-nat.c b/gdb/gnu-nat.c
-index 8cd876b21d0..7aecc2295f8 100644
---- a/gdb/gnu-nat.c
-+++ b/gdb/gnu-nat.c
-@@ -3197,31 +3197,31 @@ Show whether new threads are allowed to run (once gdb has noticed them)."),
- 	   _("Show the default detach-suspend-count value for new threads."),
- 	   &show_thread_default_cmd_list);
- 
--  cmd_list_element *set_signals_cmd
-+  cmd_list_element *set_signals_cmd_
-     = add_cmd ("signals", class_run, set_signals_cmd, _("\
- Set whether the inferior process's signals will be intercepted.\n\
- Mach exceptions (such as breakpoint traps) are not affected."),
- 	       &setlist);
--  add_alias_cmd ("sigs", set_signals_cmd, class_run, 1, &setlist);
-+  add_alias_cmd ("sigs", set_signals_cmd_, class_run, 1, &setlist);
- 
--  cmd_list_element *show_signals_cmd
-+  cmd_list_element *show_signals_cmd_
-     = add_cmd ("signals", no_class, show_signals_cmd, _("\
- Show whether the inferior process's signals will be intercepted."),
- 	       &showlist);
--  add_alias_cmd ("sigs", show_signals_cmd, no_class, 1, &showlist);
-+  add_alias_cmd ("sigs", show_signals_cmd_, no_class, 1, &showlist);
- 
--  cmd_list_element *set_signal_thread_cmd
-+  cmd_list_element *set_signal_thread_cmd_
-     = add_cmd ("signal-thread", class_run, set_sig_thread_cmd, _("\
- Set the thread that gdb thinks is the libc signal thread.\n\
- This thread is run when delivering a signal to a non-stopped process."),
- 	       &setlist);
--  add_alias_cmd ("sigthread", set_signal_thread_cmd, class_run, 1, &setlist);
-+  add_alias_cmd ("sigthread", set_signal_thread_cmd_, class_run, 1, &setlist);
- 
--  cmd_list_element *show_signal_thread_cmd
-+  cmd_list_element *show_signal_thread_cmd_
-     = add_cmd ("signal-thread", no_class, show_sig_thread_cmd, _("\
- Set the thread that gdb thinks is the libc signal thread."),
- 	       &showlist);
--  add_alias_cmd ("sigthread", show_signal_thread_cmd, no_class, 1, &showlist);
-+  add_alias_cmd ("sigthread", show_signal_thread_cmd_, no_class, 1, &showlist);
- 
-   add_cmd ("stopped", class_run, set_stopped_cmd, _("\
- Set whether gdb thinks the inferior process is stopped as with SIGSTOP.\n\
-@@ -3231,13 +3231,13 @@ Stopped process will be continued by sending them a signal."),
- Show whether gdb thinks the inferior process is stopped as with SIGSTOP."),
- 	   &showlist);
- 
--  cmd_list_element *set_exceptions_cmd
-+  cmd_list_element *set_exceptions_cmd_
-     = add_cmd ("exceptions", class_run, set_exceptions_cmd, _("\
- Set whether exceptions in the inferior process will be trapped.\n\
- When exceptions are turned off, neither breakpoints nor single-stepping\n\
- will work."), &setlist);
-   /* Allow `set exc' despite conflict with `set exception-port'.  */
--  add_alias_cmd ("exc", set_exceptions_cmd, class_run, 1, &setlist);
-+  add_alias_cmd ("exc", set_exceptions_cmd_, class_run, 1, &setlist);
- 
-   add_cmd ("exceptions", no_class, show_exceptions_cmd, _("\
- Show whether exceptions in the inferior process will be trapped."),
-@@ -3269,14 +3269,14 @@ used to pause individual threads by default instead."),
- 	     "on the thread when detaching."),
- 	   &show_task_cmd_list);
- 
--  cmd_list_element *set_task_exception_port_cmd
-+  cmd_list_element *set_task_exception_port_cmd_
-     = add_cmd ("exception-port", no_class, set_task_exc_port_cmd, _("\
- Set the task exception port to which we forward exceptions.\n\
- The argument should be the value of the send right in the task."),
- 	       &set_task_cmd_list);
--  add_alias_cmd ("excp", set_task_exception_port_cmd, no_class, 1,
-+  add_alias_cmd ("excp", set_task_exception_port_cmd_, no_class, 1,
- 		 &set_task_cmd_list);
--  add_alias_cmd ("exc-port", set_task_exception_port_cmd, no_class, 1,
-+  add_alias_cmd ("exc-port", set_task_exception_port_cmd_, no_class, 1,
- 		 &set_task_cmd_list);
- 
-   /* A convenient way of turning on all options require to noninvasively
-@@ -3464,14 +3464,15 @@ Note that this is relative to suspend count when gdb noticed the thread;\n\
- use the `thread takeover-suspend-count' to force it to an absolute value."),
- 	   &show_thread_cmd_list);
- 
--  add_cmd ("exception-port", no_class, set_thread_exc_port_cmd, _("\
-+  cmd_list_element *set_thread_exception_port_cmd_
-+    = add_cmd ("exception-port", no_class, set_thread_exc_port_cmd, _("\
- Set the thread exception port to which we forward exceptions.\n\
- This overrides the task exception port.\n\
- The argument should be the value of the send right in the task."),
- 	   &set_thread_cmd_list);
--  add_alias_cmd ("excp", set_thread_exception_port_cmd, no_class, 1,
-+  add_alias_cmd ("excp", set_thread_exception_port_cmd_, no_class, 1,
- 		 &set_thread_cmd_list);
--  add_alias_cmd ("exc-port", set_thread_exception_port_cmd, no_class, 1,
-+  add_alias_cmd ("exc-port", set_thread_exception_port_cmd_, no_class, 1,
- 		 &set_thread_cmd_list);
- 
-   add_cmd ("takeover-suspend-count", no_class, thread_takeover_sc_cmd, _("\