Add a 'sparse' make target

Given the confusion on git@vger, we'd better not name
this target "check" or (worse) "test", but it's still
useful to have. As "sparse", noone should have problems
understanding what it does.

Signed-off-by: Andreas Ericsson <ae@op5.se>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>

Makefile

@@ -8,7 +8,8 @@ OS     = unix
 BASIC_CFLAGS := -Isrc
 BASIC_CFLAGS += -fvisibility=hidden
 
-OBJS = $(patsubst %.c,%.o,$(wildcard src/*.c))
+SRC_C = $(wildcard src/*.c)
+OBJS = $(patsubst %.c,%.o,$(SRC_C))
 HDRS = $(wildcard src/*.h)
 PUBLIC_HEADERS = $(wildcard src/git/*.h)
 HDRS += $(PUBLIC_HEADERS)
@@ -39,6 +40,9 @@ apidocs:
 
 test: $(TEST_RUN)
 
+sparse:
+	@for i in $(SRC_C); do sparse $$i $(SPARSE_FLAGS) $(BASIC_CFLAGS) $(CFLAGS); done
+
 install-headers: $(PUBLIC_HEADERS)
 	@mkdir -p /tmp/gitinc/git
 	@for i in $^; do cat .HEADER $$i > /tmp/gitinc/$${i##src/}; done
@@ -91,3 +95,4 @@ $(TEST_RUN): tests/%.run: tests/%.exe
 .PHONY: test $(TEST_RUN)
 .PHONY: apidocs
 .PHONY: install-headers
+.PHONY: sparse