[PATCH][gdb/testsuite] Dump /proc/cpuinfo into gdb.log

[Tom de Vries via Gdb-patches <gdb-patches@sourceware.org>]

Hi,

When interpreting the testsuite results, it's often relevant what kind of
machine the testsuite ran on.  On a local machine one can just do
/proc/cpuinfo, but in case of running tests using a remote system
that distributes test runs to other remote systems that are not directly
accessible, that's not possible.

Fix this by dumping /proc/cpuinfo into the gdb.log.

We could do this at the start of each test run, by putting it into unix.exp
or some such.  However, this might be too verbose, so we choose to put it into
its own test-case, such that it get triggered in a full testrun, but not when
running one or a subset of tests.

We put the test-case into the gdb.testsuite directory, which is currently the
only place in the testsuite where we do not test gdb.   Though perhaps this
should be put into a new gdb.info directory, since the test-case doesn't
actually test the testsuite.

Tested on x86_64-linux.

Any comments?

Thanks,
- Tom

[gdb/testsuite] Dump /proc/cpuinfo into gdb.log

---
 gdb/testsuite/gdb.testsuite/dump-cpuinfo.exp | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/gdb/testsuite/gdb.testsuite/dump-cpuinfo.exp b/gdb/testsuite/gdb.testsuite/dump-cpuinfo.exp
new file mode 100644
index 00000000000..ee94aa1ae32
--- /dev/null
+++ b/gdb/testsuite/gdb.testsuite/dump-cpuinfo.exp
@@ -0,0 +1,27 @@
+# Copyright 2021 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/>.
+
+# The purpose of this test-case is to dump /proc/cpuinfo into gdb.log.
+
+# Check if /proc/cpuinfo is available.
+set res [remote_exec target "test -r /proc/cpuinfo"]
+set status [lindex $res 0]
+set output [lindex $res 1]
+
+if { $status == 0 && $output == "" } {
+    verbose -log "Cpuinfo available, dumping:"
+    remote_exec target "cat /proc/cpuinfo"
+} else {
+    verbose -log "Cpuinfo not available"
+}