[PATCH v2] build: fix out-of-tree builds

[Jani Nikula]

Support for out-of-tree builds was added in
commit 3e4a9d60a9419621b08c647a306843d76c47c2cb
Author: Carl Worth <cworth at cworth.org>
Date:   Wed Mar 9 15:02:42 2011 -0800

    build: Add support for non-source-directory builds.

and broken in
commit 7beeb8c88a014ecbc53d8241f10683b3c4c16228
Author: David Bremner <bremner at debian.org>
Date:   Sat Nov 17 12:28:15 2012 -0400

    test: initial performance testing infrastructure

Fix the build breakage.

Out-of-tree 'make test' has been broken since earlier than the above,
and remains broken, as does out-of-tree perf test, but at least the
build now works.

---

I didn't have the time to dig into the test and perf test breakage.
---
 Makefile                        |    7 ++++---
 performance-test/Makefile.local |    2 +-
 2 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/Makefile b/Makefile
index 73a8554..0428160 100644
--- a/Makefile
+++ b/Makefile
@@ -2,9 +2,10 @@
 # given explicitly on the command line) so mention it first.
 all:
 
-# List all subdirectories here. Each contains its own Makefile.local
-subdirs := compat completion emacs lib man parse-time-string
-subdirs += performance-test util test
+# List all subdirectories here. Each contains its own Makefile.local.
+# Use of '=', without '+=', seems to be required for out-of-tree
+# builds to work.
+subdirs = compat completion emacs lib man parse-time-string performance-test util test
 
 # We make all targets depend on the Makefiles themselves.
 global_deps = Makefile Makefile.config Makefile.local \
diff --git a/performance-test/Makefile.local b/performance-test/Makefile.local
index 73aa963..e47219a 100644
--- a/performance-test/Makefile.local
+++ b/performance-test/Makefile.local
@@ -2,7 +2,7 @@
 
 dir := performance-test
 
-include $(dir)/version.sh
+include $(srcdir)/$(dir)/version.sh
 
 TIME_TEST_SCRIPT := ${dir}/notmuch-time-test
 MEMORY_TEST_SCRIPT := ${dir}/notmuch-memory-test
-- 
1.7.10.4