When I run sparse checking it gives following error:
$ make C=1 V=1
gcc -MM -MG -MF cmds-fi-usage.o.d -MT cmds-fi-usage.o -MT \
cmds-fi-usage.static.o -MT cmds-fi-usage.o.d -g -O1 -Wall \
-D_FORTIFY_SOURCE=2 -include config.h -DBTRFS_FLAT_INCLUDES \
-D_XOPEN_SOURCE=700 -fno-strict-aliasing -fPIC cmds-fi-usage.c
[SP] ctree.c
sparse -g -O1 -Wall -D_FORTIFY_SOURCE=2 -include config.h \
-DBTRFS_FLAT_INCLUDES -D_XOPEN_SOURCE=700 -fno-strict-aliasing -fPIC \
-include -D__CHECKER__ -D__CHECK_ENDIAN__ -Wbitwise -Wuninitialized \
-Wshadow -Wundef -U_FORTIFY_SOURCE ctree.c
builtin:1:15: error: unable to open '-D__CHECKER__'
Makefile:177: recipe for target 'ctree.o' failed
make: *** [ctree.o] Error 1
It means '$(check_defs)' is passed to sparse as NULL and looks
'$(check_defs)'should be assigned before assigning '$(CHECKER_FLAGS)'.
BTW, I'm not familiar with make tool so there could be some my
misunderstanding and better solution.
Signed-off-by: Byongho Lee <bhlee.kernel@xxxxxxxxx>
---
Makefile.in | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/Makefile.in b/Makefile.in
index 85b45e5bee3b..3b98709f31a5 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -60,6 +60,7 @@ STATIC_LIBS = @UUID_LIBS_STATIC@ @BLKID_LIBS_STATIC@ \
# generate so many sparse errors that sparse stops parsing,
# which masks real errors that we want to see.
CHECKER := sparse
+check_defs := .cc-defines.h
CHECKER_FLAGS := -include $(check_defs) -D__CHECKER__ \
-D__CHECK_ENDIAN__ -Wbitwise -Wuninitialized -Wshadow -Wundef \
-U_FORTIFY_SOURCE
@@ -154,7 +155,6 @@ lib_links = libbtrfs.so.0 libbtrfs.so
headers = $(libbtrfs_headers)
# make C=1 to enable sparse
-check_defs := .cc-defines.h
ifdef C
# We're trying to use sparse against glibc headers which go wild
# trying to use internal compiler macros to test features. We
--
2.6.4
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