[PATCH 01/18] xfsprogs: enable sparse checking with "make C=[12]"

[Eric Sandeen <sandeen@redhat.com>]

Enable "make C=1" or "make C=2" to do sparse checking.
Blatantly ripped off from djwong's patch in e2fsprogs to do the same.

This is a bit simpler than redefining CC for the whole build, which
requires extra commandline definitions and apparently is enough of a
barrier that nobody's doing sparse checking.

Note, this requires unreleased sparse after v0.5, which enables the
CHAR_BIT definition; otherwise it chokes.

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
---
 Makefile           | 14 ++++++++++++++
 include/buildrules |  2 ++
 2 files changed, 16 insertions(+)

diff --git a/Makefile b/Makefile
index d031a60..7f3e774 100644
--- a/Makefile
+++ b/Makefile
@@ -16,6 +16,20 @@ else
   Q = @
 endif
 
+CHECK=sparse
+CHECK_OPTS=-Wsparse-all -Wno-transparent-union -Wno-return-void -Wno-undef \
+	-Wno-non-pointer-null -D__linux__
+ifeq ("$(C)", "2")
+  CHECK_CMD=$(CHECK) $(CHECK_OPTS) -Wbitwise -D__CHECK_ENDIAN__
+else
+  ifeq ("$(C)", "1")
+    CHECK_CMD=$(CHECK) $(CHECK_OPTS)
+   else
+    CHECK_CMD=@true
+  endif
+endif
+export CHECK_CMD
+
 MAKEOPTS = --no-print-directory Q=$(Q)
 
 TOPDIR = .
diff --git a/include/buildrules b/include/buildrules
index c57fdfc..23fc866 100644
--- a/include/buildrules
+++ b/include/buildrules
@@ -54,10 +54,12 @@ $(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
 
-- 
1.8.3.1