fix record "run" regression

This fixes the record "run" regression pointed out by Marc Khouzam:

    https://sourceware.org/ml/gdb/2014-06/msg00096.html

The bug is that target_require_runnable must agree with the handling
of the "run" target, but currently it is out of sync.  This patch
fixes the problem by changing target_require_runnable to also ignore
the record_stratum.

Built and regtested on x86-64 Fedora 20.
New test case included.

2014-07-14  Tom Tromey  <tromey@redhat.com>

	* target.c (target_require_runnable): Also check record_stratum.
	Update comment.

2014-07-14  Tom Tromey  <tromey@redhat.com>

	* gdb.reverse/rerun-prec.c: New file.
	* gdb.reverse/rerun-prec.exp: New file.

5 files changed, 68 insertions, 1 deletions

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 1ccacd3..c917718 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,8 @@
+2014-07-14  Tom Tromey  <tromey@redhat.com>
+
+	* target.c (target_require_runnable): Also check record_stratum.
+	Update comment.
+
 2014-07-11  Yao Qi  <yao@codesourcery.com>
 
 	* arm-tdep.c (thumb_analyze_prologue): Break the loop if
diff --git a/gdb/target.c b/gdb/target.c
index c9c5e4b..07d029a 100644
--- a/gdb/target.c
+++ b/gdb/target.c
@@ -2425,10 +2425,11 @@ target_require_runnable (void)
       if (t->to_create_inferior != NULL)
 	return;
 
-      /* Do not worry about thread_stratum targets that can not
+      /* Do not worry about targets at certain strata that can not
 	 create inferiors.  Assume they will be pushed again if
 	 necessary, and continue to the process_stratum.  */
       if (t->to_stratum == thread_stratum
+	  || t->to_stratum == record_stratum
 	  || t->to_stratum == arch_stratum)
 	continue;
 
diff --git a/gdb/testsuite/ChangeLog b/gdb/testsuite/ChangeLog
index 0652230..71987a7 100644
--- a/gdb/testsuite/ChangeLog
+++ b/gdb/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2014-07-14  Tom Tromey  <tromey@redhat.com>
+
+	* gdb.reverse/rerun-prec.c: New file.
+	* gdb.reverse/rerun-prec.exp: New file.
+
 2014-07-12  Maciej W. Rozycki  <macro@mips.com>
 	    Maciej W. Rozycki  <macro@codesourcery.com>
 
diff --git a/gdb/testsuite/gdb.reverse/rerun-prec.c b/gdb/testsuite/gdb.reverse/rerun-prec.c
new file mode 100644
index 0000000..c0f90cb
--- /dev/null
+++ b/gdb/testsuite/gdb.reverse/rerun-prec.c
@@ -0,0 +1,21 @@
+/* This testcase is part of GDB, the GNU debugger.
+
+   Copyright 2014 Free Software Foundation, Inc.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+int main (int argc, char **argv)
+{
+  return 0;
+}
diff --git a/gdb/testsuite/gdb.reverse/rerun-prec.exp b/gdb/testsuite/gdb.reverse/rerun-prec.exp
new file mode 100644
index 0000000..995577e
--- /dev/null
+++ b/gdb/testsuite/gdb.reverse/rerun-prec.exp
@@ -0,0 +1,35 @@
+# Copyright 2014 Free Software Foundation, Inc.
+
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+if {![supports_reverse] || ![supports_process_record]} {
+    return
+}
+
+standard_testfile
+
+if {[prepare_for_testing $testfile.exp $testfile [list $srcfile]]} {
+    return -1
+}
+
+# The bug is a regression in the sequence "run; record; run".
+runto main
+gdb_test_no_output "record" "Turn on process record"
+
+gdb_run_cmd
+gdb_test_multiple "" "restarting inferior" {
+    -re "Breakpoint .*${gdb_prompt} " {
+	pass "restarting inferior"
+    }
+}