Use __CHECKER__ to detect when sparse is running

Signed-off-by: Ramsay Jones <ramsay@ramsay1.demon.co.uk>
Acked-by: Andreas Ericsson <ae@op5.se>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>

Makefile

@@ -38,7 +38,7 @@ apidocs:
 test: $(TEST_RUN)
 
 sparse:
-	cgcc -no-compile -DSPARSE_IS_RUNNING $(ALL_CFLAGS) $(SPARSE_FLAGS) $(SRC_C)
+	cgcc -no-compile $(ALL_CFLAGS) $(SPARSE_FLAGS) $(SRC_C)
 
 install-headers: $(PUBLIC_HEADERS)
 	@mkdir -p /tmp/gitinc/git

src/git/thread-utils.h

@@ -23,7 +23,7 @@
 #endif
 
 /* sparse doesn't grok thread-local variables */
-#ifdef SPARSE_IS_RUNNING
+#if defined(__CHECKER__)
 # undef GIT_HAS_TLS
 # undef GIT_TLS
 # define GIT_TLS