Re: [PATCH 5/8] gen-pert-test: parallel build support

[Patrick Palka <patrick at parcs dot ath dot cx>]

On Tue, Jul 21, 2015 at 9:44 AM, Doug Evans <dje@google.com> wrote:
> Hi.
>
> This patch adds parallel build support for perf testcases.
> To use the existing machinery, GDB_PARALLEL now contains
> the subdirectory in which to put the parallel builds.
>
> 2015-07-20  Doug Evans  <dje@google.com>
>
>         * Makefile.in (check/%.exp): Pass directory for GDB_PARALLEL.
>         (workers/%.worker, build-perf): New rule.
>         (GDB_PERFTEST_MODE): New variable.
>         (check-perf): Use it.
>         (clean): Clean up gdb.perf parallel build subdirs.
>         * lib/build-piece.exp: New file.
>         * lib/cache.exp (gdb_do_cache): Include $GDB_PARALLEL in path name.
>         * lib/gdb.exp (standard_output_file): Include $GDB_PARALLEL in path
>         name.
>         (standard_temp_file): Ditto.
>         (GDB_PARALLEL handling): Make outputs,temp,cache directories as
> subdirs
>         of $GDB_PARALLEL.

This patch seems to have caused a number of regressions:

http://gdb-build.sergiodj.net/builders/Fedora-x86_64-m64/builds/1502
http://gdb-build.sergiodj.net/builders/Fedora-x86_64-m32/builds/1501
http://gdb-build.sergiodj.net/builders/Fedora-i686/builds/1510

(possibly among others)

Reverting this patch locally makes the regressions disappear for me,
at least on x86_64-m64.