Makefile: protect .po file and gen_db files with SHA256STAMP.

And rename them so they're not cleared by `make clean`.  We leave the
old rules in place so old files get cleaned still.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

wallet/Makefile

@@ -25,12 +25,12 @@ WALLET_OBJS := $(WALLET_SRC:.c=.o)
 $(WALLET_OBJS): $(WALLET_HDRS) $(LIGHTNINGD_HEADERS)
 
 # Make sure these depend on everything.
-ALL_C_SOURCES += $(WALLET_SRC)
+ALL_C_SOURCES += $(WALLET_SRC) wallet/db_sqlite3_sqlgen.c wallet/db_postgres_sqlgen.c
 ALL_C_HEADERS += $(WALLET_HDRS)
 
 # Each database driver depends on its rewritten statements.
-wallet/db_sqlite3.o: wallet/gen_db_sqlite3.c
-wallet/db_postgres.o: wallet/gen_db_postgres.c
+wallet/db_sqlite3.o: wallet/db_sqlite3_sqlgen.c
+wallet/db_postgres.o: wallet/db_postgres_sqlgen.c
 
 # The following files contain SQL-annotated statements that we need to extact
 SQL_FILES := 				\
@@ -40,11 +40,11 @@ SQL_FILES := 				\
 	wallet/test/run-db.c		\
 	wallet/test/run-wallet.c	\
 
-wallet/statements.po: $(SQL_FILES)
-	xgettext -kNAMED_SQL -kSQL --add-location --no-wrap --omit-header -o $@ $(SQL_FILES)
+wallet/statements_gettextgen.po: $(SQL_FILES) FORCE
+	@if $(call SHA256STAMP_CHANGED,); then $(call VERBOSE,"xgettext $@",xgettext -kNAMED_SQL -kSQL --add-location --no-wrap --omit-header -o $@ $(SQL_FILES) && $(call SHA256STAMP,,# )); fi
 
-wallet/gen_db_%.c:  wallet/statements.po devtools/sql-rewrite.py
-	devtools/sql-rewrite.py wallet/statements.po $* > wallet/gen_db_$*.c
+wallet/db_%_sqlgen.c: wallet/statements_gettextgen.po devtools/sql-rewrite.py FORCE
+	@if $(call SHA256STAMP_CHANGED,); then $(call VERBOSE,"sql-rewrite $@",devtools/sql-rewrite.py wallet/statements.po $* > $@ && $(call SHA256STAMP,,//)); fi
 
 clean: wallet_clean
 wallet-clean:
@@ -52,4 +52,8 @@ wallet-clean:
 	$(RM) wallet/gen_db_sqlite3.c
 	$(RM) wallet/gen_db_postgres.c
 
+maintainer-clean: wallet_maintainer-clean
+wallet-maintainer-clean:
+	$(RM) wallet/statements_gettextgen.po
+
 include wallet/test/Makefile

wallet/db_postgres.c

@@ -1,5 +1,5 @@
 #include <wallet/db_common.h>
-#include "gen_db_postgres.c"
+#include "db_postgres_sqlgen.c"
 #include <ccan/ccan/tal/str/str.h>
 #include <ccan/endian/endian.h>
 #include <lightningd/log.h>

wallet/db_sqlite3.c

@@ -1,5 +1,5 @@
 #include <wallet/db_common.h>
-#include "gen_db_sqlite3.c"
+#include "db_sqlite3_sqlgen.c"
 #include <ccan/ccan/tal/str/str.h>
 #include <lightningd/log.h>
 #include <stdio.h>