submodules: overhaul documentation

diff --git a/t/perf/run b/t/perf/run
index c788d713ae927007866b5b73920de2674f816207..beb4acc0e428d20280a649c428da8b0b3aa5b4c6 100755 (executable)
--- a/t/perf/run
+++ b/t/perf/run
@@ -24,6 +24,7 @@ run_one_dir () {
 
 unpack_git_rev () {
        rev=$1
+       echo "=== Unpacking $rev in build/$rev ==="
        mkdir -p build/$rev
        (cd "$(git rev-parse --show-cdup)" && git archive --format=tar $rev) |
        (cd build/$rev && tar x)
@@ -37,8 +38,16 @@ build_git_rev () {
                        cp "../../$config" "build/$rev/"
                fi
        done
-       (cd build/$rev && make $GIT_PERF_MAKE_OPTS) ||
-       die "failed to build revision '$mydir'"
+       echo "=== Building $rev ==="
+       (
+               cd build/$rev &&
+               if test -n "$GIT_PERF_MAKE_COMMAND"
+               then
+                       sh -c "$GIT_PERF_MAKE_COMMAND"
+               else
+                       make $GIT_PERF_MAKE_OPTS
+               fi
+       ) || die "failed to build revision '$mydir'"
 }
 
 run_dirs_helper () {