Makefile: generalize whitespace check.

Spread to individual Makefiles, and include headers.

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

Makefile

@@ -252,8 +252,10 @@ check-bolt: check-bolt.o $(CCAN_OBJS)
 
 check-bolt.o: $(CCAN_HEADERS)
 
-check-whitespace:
-	@if grep -n '[ 	]$$' Makefile daemon/test/Makefile daemon/Makefile bitcoin/Makefile check-bolt.c $(CORE_SRC) $(BITCOIN_SRC) $(DAEMON_SRC); then echo Extraneous whitespace found >&2; exit 1; fi
+check-whitespace/%: %
+	@if grep -Hn '[ 	]$$' $<; then echo Extraneous whitespace found >&2; exit 1; fi
+
+check-whitespace: check-whitespace/Makefile check-whitespace/check-bolt.c $(CORE_SRC:%=check-whitespace/%) $(CORE_HEADERS:%=check-whitespace/%)
 
 check-source: check-makefile check-source-bolt check-whitespace	\
 	$(CORE_SRC:%=check-src-include-order/%)		\

bitcoin/Makefile

@@ -15,4 +15,6 @@ check: bitcoin-tests
 
 check-source-bolt: $(BITCOIN_SRC:%=bolt-check/%) $(BITCOIN_HEADERS:%=bolt-check/%)
 
+check-whitespace: $(BITCOIN_SRC:%=check-whitespace/%) $(BITCOIN_HEADERS:%=check-whitespace/%) check-whitespace/bitcoin/Makefile
+
 bitcoin-tests: $(BITCOIN_TEST_PROGRAMS:%=unittest/%)

daemon/Makefile

@@ -123,6 +123,8 @@ check-daemon-makefile:
 
 check-source-bolt: $(DAEMON_SRC:%=bolt-check/%) $(DAEMON_HEADERS:%=bolt-check/%)
 
+check-whitespace: $(DAEMON_SRC:%=check-whitespace/%) $(DAEMON_HEADERS:%=check-whitespace/%) check-whitespace/daemon/Makefile
+
 # Git submodules are seriously broken.
 daemon/jsmn/jsmn.h:
 	git submodule update daemon/jsmn/

wire/Makefile

@@ -28,6 +28,9 @@ wire/gen_wire.o: wire/gen_wire.h
 check-source: $(WIRE_SRC:%=check-src-include-order/%) $(WIRE_HEADERS:%=check-hdr-include-order/%)
 
 check-source-bolt: $(WIRE_SRC:%=bolt-check/%) $(WIRE_HEADERS:%=bolt-check/%)
+
+check-whitespace: $(WIRE_SRC:%=check-whitespace/%) $(WIRE_HEADERS:%=check-whitespace/%) check-whitespace/wire/Makefile
+
 clean: wire-clean
 
 wire-all: wire/gen_wire.o wire/fromwire.o wire/towire.o