[PATCH v2 3/3] Makefile: run coccicheck on more source files

[Denton Liu <liu.denton@gmail.com>]

Before, when running the "coccicheck" target, only the source files
which were being compiled would have been checked by Coccinelle.
However, just because we aren't compiling a source file doesn't mean we
have to exclude it from analysis. This will allow us to catch more
mistakes, in particular ones that affect Windows-only sources since
Coccinelle currently runs only on Linux.

Make the "coccicheck" target run on all C sources except for those that
are taken from some third-party source. We don't want to patch these
files since we want them to be as close to upstream as possible so that
it'll be easier to pull in upstream updates.

When running a build on Arch Linux with no additional flags provided,
after applying this patch, the following sources are now checked:

* block-sha1/sha1.c
* compat/access.c
* compat/basename.c
* compat/fileno.c
* compat/gmtime.c
* compat/hstrerror.c
* compat/memmem.c
* compat/mingw.c
* compat/mkdir.c
* compat/mkdtemp.c
* compat/mmap.c
* compat/msvc.c
* compat/pread.c
* compat/precompose_utf8.c
* compat/qsort.c
* compat/setenv.c
* compat/sha1-chunked.c
* compat/snprintf.c
* compat/stat.c
* compat/strcasestr.c
* compat/strdup.c
* compat/strtoimax.c
* compat/strtoumax.c
* compat/unsetenv.c
* compat/win32/dirent.c
* compat/win32/path-utils.c
* compat/win32/pthread.c
* compat/win32/syslog.c
* compat/win32/trace2_win32_process_info.c
* compat/win32mmap.c
* compat/winansi.c
* ppc/sha1.c

This also results in the following source now being excluded:

* compat/obstack.c

Signed-off-by: Denton Liu <liu.denton@gmail.com>
---
 Makefile | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/Makefile b/Makefile
index e2c693440b..7c88e0606f 100644
--- a/Makefile
+++ b/Makefile
@@ -2803,12 +2803,8 @@ check: command-list.h
 		exit 1; \
 	fi
 
-C_SOURCES = $(patsubst %.o,%.c,$(C_OBJ))
-ifdef DC_SHA1_SUBMODULE
-COCCI_SOURCES = $(filter-out sha1collisiondetection/%,$(C_SOURCES))
-else
-COCCI_SOURCES = $(filter-out sha1dc/%,$(C_SOURCES))
-endif
+FIND_C_SOURCES = $(filter %.c,$(shell $(FIND_SOURCE_FILES)))
+COCCI_SOURCES = $(filter-out $(THIRD_PARTY_SOURCES),$(FIND_C_SOURCES))
 
 %.cocci.patch: %.cocci $(COCCI_SOURCES)
 	@echo '    ' SPATCH $<; \
-- 
2.23.0.37.g745f681289