gnu: gdb: Add support for the Hurd.

* gnu/packages/gdb.scm (gdb-9.1)[native-inputs]: When compiling for the Hurd,
add required build dependency mig.
["arguments"]: Add "binutils" fall-back lookup in native-inputs for
cross-builds.
* gnu/packages/patches/gdb-hurd.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it.
* gnu/packages/gdb.scm (gdb-9.2): Use it.

1 files changed, 69 insertions, 0 deletions

diff --git a/gnu/packages/patches/gdb-hurd.patch b/gnu/packages/patches/gdb-hurd.patch
new file mode 100644
index 0000000000..0af8d4dc28
--- /dev/null
+++ b/gnu/packages/patches/gdb-hurd.patch
@@ -0,0 +1,69 @@
+Taken from upstream, removed ChangeLog.
+
+From 6930bffe3373690b3431d6291f9f7c116d6a1ec4 Mon Sep 17 00:00:00 2001
+From: Samuel Thibault <samuel.thibault@ens-lyon.org>
+Date: Sat, 30 May 2020 18:35:59 +0000
+Subject: [PATCH] hurd: fix gnu_debug_flag type
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+Fixes
+
+../../gdb/gnu-nat.c:96:6: error: conflicting declaration ‘bool gnu_debug_flag’
+   96 | bool gnu_debug_flag = false;
+../../gdb/gnu-nat.c: In function ‘void _initialize_gnu_nat()’:
+../../gdb/gnu-nat.c:3511:7: error: cannot
+
+gdb/ChangeLog:
+
+	* gnu-nat.h (gnu_debug_flag): Set type to bool.
+---
+ gdb/ChangeLog | 4 ++++
+ gdb/gnu-nat.h | 2 +-
+ 2 files changed, 5 insertions(+), 1 deletion(-)
+
+diff --git a/gdb/gnu-nat.h b/gdb/gnu-nat.h
+index 77c57817b2..766f716587 100644
+--- a/gdb/gnu-nat.h
++++ b/gdb/gnu-nat.h
+@@ -111,7 +111,7 @@ extern char *proc_string (struct proc *proc);
+ 	      __proc_pid (__proc), __proc->tid, \
+ 	      host_address_to_string (__proc) , ##args); } while (0)
+ 
+-extern int gnu_debug_flag;
++extern bool gnu_debug_flag;
+ 
+ #define debug(msg, args...) \
+  do { if (gnu_debug_flag) \
+-- 
+Jan Nieuwenhuizen <janneke@gnu.org> | GNU LilyPond http://lilypond.org
+Freelance IT http://JoyofSource.com | Avatar® http://AvatarAcademy.com
+
+commit 366f550a593c7e6bae3699a4b6d65fe937af5603
+Author: Samuel Thibault <samuel.thibault@ens-lyon.org>
+Date:   Sat May 30 18:41:30 2020 +0000
+
+    hurd: add missing include
+    
+    Fixes
+    
+    ../../gdb/gnu-nat.c:2522:14: error: ‘target_gdbarch’ was not declared in this scope; did you mean ‘target_detach’?
+     2522 |    paddress (target_gdbarch (), memaddr), pulongest (len),
+    
+    gdb/Changelog:
+    
+            * gnu-nat.c: Include "gdbarch.h".
+
+diff --git a/gdb/gnu-nat.c b/gdb/gnu-nat.c
+index 3b438a9a43..9b93488b41 100644
+--- a/gdb/gnu-nat.c
++++ b/gdb/gnu-nat.c
+@@ -64,6 +64,7 @@ extern "C"
+ #include "language.h"
+ #include "target.h"
+ #include "gdbsupport/gdb_wait.h"
++#include "gdbarch.h"
+ #include "gdbcmd.h"
+ #include "gdbcore.h"
+ #include "gdbthread.h"