btrace: fix tests for 32-bit

The x86-record_goto.S assembly source file does not build on 32-bit.
This breaks many tests that use this file.

Split it into x86_64-record_goto.S and i686-record_goto.S.  Luckily, we
can use either one with the same test .exp file.

It further turned out that most tests do not really need a fixed binary;
they should work pretty well with a newly-compiled C program.  The
one thing that breaks this is the heavy use of "record goto" to navigate
inside the recorded execution.

Combine step.exp, next,exp, and finish.exp into a single test step.exp
and use normal stepping and reverse-stepping commands for navigation.

testsuite/
	* gdb.btrace/next.exp: Merged into step.exp.
	* gdb.btrace/finish.exp: Merged into step.exp.
	* gdb.btrace/nexti.exp: Merged into stepi.exp.
	* gdb.btrace/step.exp: Use record_goto.c as test file.  Avoid using
	"record goto" and checking the exact replay position.
	* gdb.btrace/stepi.exp: Choose test file based on target.  Do not
	check for "Recording format" in "info record" output.
	* gdb.btrace/record_goto.exp: Choose test file based on target.
	* gdb.btrace/x86-record_goto.S: Renamed into ...
	* gdb.btrace/x86_64-record_goto.S: ... this.
	* gdb.btrace/i686-record_goto.S: New.
	* gdb.btrace/x86-tailcall.S: Renamed into ...
	* gdb.btrace/x86_64-tailcall.S: ... this.
	* gdb.btrace/i686-tailcall.S: New.
	* gdb.btrace/x86-tailcall.c: Renamed into ...
	* gdb.btrace/tailcall.c: ... this.  Split "return ++answer" into two
	separate statements.  Update test.
	* gdb.btrace/delta.exp: Use record_goto.c as test file.
	* gdb.btrace/gcore.exp: Use record_goto.c as test file.
	* gdb.btrace/nohist.exp: Use record_goto.c as test file.
	* gdb.btrace/tailcall.exp: Choose test file based on target.
	* gdb.btrace/Makefile.in: Remove next, finish, and nexti.

1 files changed, 41 insertions, 0 deletions

diff --git a/gdb/testsuite/gdb.btrace/tailcall.c b/gdb/testsuite/gdb.btrace/tailcall.c
new file mode 100644
index 0000000..6c7b580
--- /dev/null
+++ b/gdb/testsuite/gdb.btrace/tailcall.c
@@ -0,0 +1,41 @@
+/* This testcase is part of GDB, the GNU debugger.
+
+   Copyright 2013-2015 Free Software Foundation, Inc.
+
+   Contributed by Intel Corp. <markus.t.metzger@intel.com>
+
+   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/>.  */
+
+static __attribute__ ((noinline)) int
+bar (void)
+{
+  return 42;
+}
+
+static __attribute__ ((noinline)) int
+foo (void)
+{
+  return bar ();
+}
+
+int
+main (void)
+{
+  int answer;
+
+  answer = foo ();
+  answer += 1;
+
+  return answer;
+}