[PATCH 1/7] fstests: enable sparse checking with make C=[12]

[Eric Sandeen <sandeen@redhat.com>]

Enable "make C=1" sparse checking when files get rebuilt. To check
all files, run "make clean" first.

Enable "make C=2" sparse checking of all files without rebuilding them.

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Reviewed-by: "Darrick J. Wong" <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
---
 Makefile           | 14 ++++++++++++++
 include/buildrules | 19 +++++++++++++++++++
 2 files changed, 33 insertions(+)

diff --git a/Makefile b/Makefile
index f955f0d3..a48d8d62 100644
--- a/Makefile
+++ b/Makefile
@@ -14,6 +14,20 @@ else
   Q = @
 endif
 
+CHECK=sparse
+CHECK_OPTS=-Wsparse-all -Wbitwise -Wno-transparent-union -Wno-return-void -Wno-undef \
+	-Wno-non-pointer-null -D__CHECK_ENDIAN__ -D__linux__
+
+ifeq ("$(origin C)", "command line")
+  CHECK_CMD=$(CHECK) $(CHECK_OPTS)
+  CHECKSRC=$(C)
+else
+  CHECK_CMD=@true
+  CHECKSRC=0
+endif
+
+export CHECK_CMD CHECKSRC
+
 MAKEOPTS = --no-print-directory Q=$(Q)
 
 TOPDIR = .
diff --git a/include/buildrules b/include/buildrules
index bf187662..6c2b7e18 100644
--- a/include/buildrules
+++ b/include/buildrules
@@ -35,6 +35,21 @@ endif
 # Standard targets
 #
 
+ifeq ($(CHECKSRC),2)
+
+# Check every .c file with sparse CHECK_CMD, do not call compiler
+$(LTCOMMAND) $(LTLIBRARY) : $(SUBDIRS) $(OBJECTS)
+.PHONY: $(LTCOMMAND) $(LTLIBRARY)
+
+%.lo %.o : %.c FORCE
+	@echo "    [CHECK]  $<"
+	$(Q)$(CHECK_CMD) $(CFLAGS) $<
+
+FORCE:
+
+else
+# Regular build, possibly calling sparse CHECK_CMD as well
+
 ifdef LTCOMMAND
 $(LTCOMMAND) : $(SUBDIRS) $(OBJECTS) $(LTDEPENDENCIES)
 	@echo "    [LD] $*"
@@ -49,12 +64,16 @@ $(LTLIBRARY) : $(SUBDIRS) $(LTOBJECTS)
 %.lo: %.c
 	@echo "    [CC] $@"
 	$(Q)$(LTCOMPILE) -c $<
+	$(Q)$(CHECK_CMD) $(CFLAGS) $<
 else
+
 %.o: %.c
 	@echo "    [CC] $@"
 	$(Q)$(CC) $(CFLAGS) -c $<
+	$(Q)$(CHECK_CMD) $(CFLAGS) $<
 
 endif
+endif
 
 ifdef POTHEAD
 %.pot: $(XGETTEXTFILES)
-- 
2.48.0