t/perf/run: copy config.mak.autogen & friends to build area

Otherwise for people who use autotools-based configure in main worktree,
the performance testing results will be inconsistent as work and build
trees could be using e.g. different optimization levels.

See e.g.

	http://public-inbox.org/git/20160818175222.bmm3ivjheokf2qzl@sigill.intra.peff.net/

for example.

NOTE config.status has to be copied because otherwise without it the build
would want to run reconfigure this way loosing just copied config.mak.autogen.

Signed-off-by: Kirill Smelkov <kirr@nexedi.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/t/perf/run b/t/perf/run
index cfd7012..e8adeda 100755 (executable)
--- a/t/perf/run
+++ b/t/perf/run
@@ -30,7 +30,13 @@ unpack_git_rev () {
 }
 build_git_rev () {
        rev=$1
-       cp ../../config.mak build/$rev/config.mak
+       for config in config.mak config.mak.autogen config.status
+       do
+               if test -e "../../$config"
+               then
+                       cp "../../$config" "build/$rev/"
+               fi
+       done
        (cd build/$rev && make $GIT_PERF_MAKE_OPTS) ||
        die "failed to build revision '$mydir'"
 }