gdb/testsuite: add a new check-all-boards target

The make-check-all.sh script (gdb/testsuite/make-check-all.sh) is
great, it makes it super easy to run some test(s) using all the
available board files.

This commit aims to make this script even easier to access by adding a
check-all-boards target to the GDB Makefile.  This new target checks
for (and requires) a number of environment variables, so the target
should be used like this:

  make check-all-boards GDB_TARGET_USERNAME=remote-target \
                        GDB_HOST_USERNAME=remote-host \
			TESTS="gdb.base/break.exp"

Where GDB_TARGET_USERNAME and GDB_HOST_USERNAME are the user names
that should be passed to the make-check-all.sh --target-user and
--host-user command line options respectively.

My personal intention is to set these variables in my environment, so
all I'll need to do is:

  make check-all-boards TESTS="gdb.base/break.exp"

The make rule always passes --keep-results to the make-check-all.sh
script, as I find that the most useful.  It's super frustrating to run
the tests and realise you forgot that option and the results have been
discarded.

1 files changed, 8 insertions, 0 deletions

diff --git a/gdb/Makefile.in b/gdb/Makefile.in
index a50628e..3510577 100644
--- a/gdb/Makefile.in
+++ b/gdb/Makefile.in
@@ -1971,6 +1971,14 @@ check-parallel: force
 	  $(MAKE) $(TARGET_FLAGS_TO_PASS) check-parallel; \
 	else true; fi
 
+check-all-boards: force
+	@if [ -f testsuite/Makefile ]; then \
+	  rootme=`pwd`; export rootme; \
+	  rootsrc=`cd $(srcdir); pwd`; export rootsrc; \
+	  cd testsuite; \
+	  $(MAKE) $(TARGET_FLAGS_TO_PASS) check-all-boards; \
+	else true; fi
+
 # The idea is to parallelize testing of multilibs, for example:
 #   make -j3 check//sh-hms-sim/{-m1,-m2,-m3,-m3e,-m4}/{,-nofpu}
 # will run 3 concurrent sessions of check, eventually testing all 10