[PATCH pve-cluster 08/12] buildsys: link pmxcfs against the rust notify staticlib

[Hannes Laimer <h.laimer@proxmox.com>]

The C convenience library calls nothing in the staticlib, so the
database tool and the test programs link as before. The pmxcfs
Makefile builds the staticlib itself, so a standalone make in
src/pmxcfs keeps working. The staticlib's prerequisites come from the
dependency file cargo writes, so a changed Rust source rebuilds it.

Signed-off-by: Hannes Laimer <h.laimer@proxmox.com>
---
 src/pmxcfs/Makefile | 19 +++++++++++++++++--
 1 file changed, 17 insertions(+), 2 deletions(-)

diff --git a/src/pmxcfs/Makefile b/src/pmxcfs/Makefile
index 90bc6a5..e05b4e3 100644
--- a/src/pmxcfs/Makefile
+++ b/src/pmxcfs/Makefile
@@ -1,3 +1,4 @@
+include ../defines.mk
 
 DEPENDENCIES=libcpg libcmap libcorosync_common libquorum libqb glib-2.0 fuse sqlite3 librrd
 
@@ -12,9 +13,18 @@ CFLAGS += -I../rust/pmxcfs-ffi/include
 
 LDFLAGS += -Wl,-z,relro $(shell pkg-config --libs $(DEPENDENCIES))
 
+NOTIFY_LIB := $(abspath ../rust/$(RUST_COMPILE_DIR)/libpmxcfs_ffi.a)
+# from `cargo rustc -p pmxcfs-ffi --release -- --print native-static-libs`
+NOTIFY_LIBS := -lgcc_s -lutil -lrt -lpthread -lm -ldl -lc
+
 AR = ar
 ARFLAGS = crs
 
+-include $(NOTIFY_LIB:.a=.d)
+# a source file deleted since cargo wrote the dep file has no rule, and make
+# would stop before the rebuild that drops it from the list
+%.rs: ;
+
 .c.o:
 	$(CC) $(CFLAGS) -c -o $@ $< -MMD -MT $@ -MF $@.d
 
@@ -26,9 +36,14 @@ libpmxcfs.a: cfs-utils.o memdb.o database.o
 libpmxcfs.a:
 	$(AR) $(ARFLAGS) $@ $^
 
-pmxcfs: pmxcfs.o libpmxcfs.a
-	$(CC) -o $@ $^ $(LDFLAGS)
+pmxcfs: pmxcfs.o libpmxcfs.a $(NOTIFY_LIB)
+	$(CC) -o $@ $^ $(LDFLAGS) $(NOTIFY_LIBS)
 
+$(NOTIFY_LIB): ../rust/Cargo.toml ../rust/.cargo/config.toml \
+	../rust/pmxcfs-ffi/Cargo.toml ../rust/pmxcfs-notify/Cargo.toml
+	$(MAKE) -C ../rust all
+.PHONY: notify-lib
+notify-lib: $(NOTIFY_LIB)
 
 create_pmxcfs_db: create_pmxcfs_db.o libpmxcfs.a
 	$(CC) $(CFLAGS) -o $@ $^ $(LDFLAGS)
-- 
2.47.3