gdb/testsuite: use TESTS from make-check-all.sh

Update the make-check-all.sh script to use TESTS rather than passing
the test names within RUNTESTFLAGS.  This addresses the following
issue:

I was running some tests like this:

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

And I was finding that I would get lots of DUPLICATE test results,
which is not what I expected.

What's happening here is that the 'make check-all-boards' rule runs
the 'make-check-all.sh' script, which then runs 'make check' with
various board files.

However, passing TESTS=... to the initial 'make check-all-boards'
command invocation automatically causes the TESTS value to be added to
the MAKEFLAGS environment variable, this is then picked up by the
later calls to 'make check'.

Now, in GDB's testfile/Makefile, we check for TESTS, and if this is
set, we expand the value and set `expanded_tests_or_none`.  Otherwise,
if TESTS is not set, expanded_tests_or_none is left empty.

Finally, when handling 'make check', the value of
`expanded_tests_or_none` is passed through to dejagnu, along with the
RUNTESTFLAGS value.

What this means is that, when make-check-all.sh passes the test names
in the RUNTESTFLAGS, then dejagnu ends up seeing the list of tests
twice, once from RUNTESTFLAGS, and once from expanded_tests_or_none,
and this is why I was seeing duplicate testnames.

The easiest fix for the above is to have make-check-all.sh pass the
test names using TESTS="...", this will override the TESTS="..." value
already present in MAKEFLAGS, and means dejagnu will see the test
names just once.

Additionally, this is a start towards allowing parallel test running
from the make-check-all.sh script.  Parallel test running only works
if the test names are passed in TESTS, and not in RUNTESTFLAGS.
Currently, in testsuite/Makefile, if RUNTESTFLAGS is not empty, then
we force single threaded test running.  But with this change, at least
for the `local` board, we can now benefit from multi-threaded test
running, as this board has an empty RUNTESTFLAGS now.  For the other
boards we'd need to set FORCE_PARALLEL in order to benefit from
parallel test running, but we'll need to double check that all the
board files actually support parallel test running first, so I'm
leaving that for another day.

diff --git a/gdb/testsuite/make-check-all.sh b/gdb/testsuite/make-check-all.sh
index c2fbadb88df9c84d2ca969ddcc129280f9e61f48..ab7257476c3770e17f2b77ae0e95650eb2d29be2 100755 (executable)
--- a/gdb/testsuite/make-check-all.sh
+++ b/gdb/testsuite/make-check-all.sh
@@ -192,7 +192,7 @@ do_tests ()
 
     # Run make check.
     make $maketarget \
-        RUNTESTFLAGS="${rtf[*]} ${tests[*]}" \
+        RUNTESTFLAGS="${rtf[*]}" TESTS="${tests[*]}" \
         2>&1 \
        | summary
 
@@ -216,7 +216,7 @@ do_tests ()
        cp gdb.sum gdb.log "$dir"
 
        # Record the 'make check' command to enable easy re-running.
-       echo "make $maketarget RUNTESTFLAGS=\"${rtf[*]} ${tests[*]}\"" \
+       echo "make $maketarget RUNTESTFLAGS=\"${rtf[*]}\" TESTS=\"${tests[*]}\"" \
             > "$dir/make-check.sh"
     fi
 }