[PATCH v4 02/11] tools/ocaml/xenstored/Makefile: use ocamldep -sort for linking order

[Edwin Török <edvin.torok@xxxxxxxxxx>]

A better solution is being worked on for master,
but for now use ocamldep -sort instead of a manually established link
order.
The manually established link order will be wrong when (security)
patches introduce new dependencies between files that would require
changing the link order.

If dune was used as a build system this wouldn't be a problem, but we
can't use Dune yet due to OSSTest, which is stuck on Debian oldstable.

No functional change.

Signed-off-by: Edwin Török <edvin.torok@xxxxxxxxxx>
Acked-by: Christian Lindig <christian.lindig@xxxxxxxxxx>
---
Reason for inclusion in 4.17:

Avoids having to put this patch as a prerequisite into a security update.
Earlier versions of XSA-326 needed this, and although latest version
didn't we don't know whether it might be needed again in the future or not.

Changes since v2:
- new in v3 (was previously emailed to security team though)

Changes since v3:
- add Acked-by line
---
 tools/ocaml/xenstored/Makefile | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/tools/ocaml/xenstored/Makefile b/tools/ocaml/xenstored/Makefile
index 6f7333926e..e8aaecf2e6 100644
--- a/tools/ocaml/xenstored/Makefile
+++ b/tools/ocaml/xenstored/Makefile
@@ -72,7 +72,11 @@ XENSTOREDLIBS = \
 PROGRAMS = oxenstored
 
 oxenstored_LIBS = $(XENSTOREDLIBS)
-oxenstored_OBJS = $(OBJS)
+# use ocamldep to figure out link order, otherwise the Makefile would have
+# to be continously adjusted for security patches that introduce new
+# dependencies between files
+oxenstored_MLSORTED = $(shell $(OCAMLDEP) -sort $(OBJS:=.ml))
+oxenstored_OBJS = $(oxenstored_MLSORTED:.ml=)
 
 OCAML_PROGRAM = oxenstored
 
-- 
2.34.1