[PATCH 2/2] Makefile: suppress a sparse warning for pack-revindex.c

[PATCH 2/2] Makefile: suppress a sparse warning for pack-revindex.c

[Ramsay Jones]

Sparse has, for a long time, been issuing the following warning against
the pack-revindex.c file:

      SP pack-revindex.c
  pack-revindex.c:64:23: warning: memset with byte count of 262144

This results from a unconditional check, with a hard-coded limit, which
is really only appropriate for the kernel source code. (The check is for
a 'large' byte count in a call to memcpy(), memset(), copy_from_user()
and copy_to_user() functions).

A recent release of sparse (v0.5.1) has introduced some options to allow
this check to be turned off (-Wno-memcpy-max-count) or to specify the
actual limit used (-fmemcpy-max-count=COUNT), rather than a hard-coded
limit of 100000.

In order to suppress the warning, add a target for pack-revindex.sp that
adds the '-Wno-memcpy-max-count' option to the SPARSE_FLAGS variable.

Signed-off-by: Ramsay Jones <ramsay@ramsayjones.plus.com>
---
 Makefile | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Makefile b/Makefile
index 1a9b23b67..7f40f7673 100644
--- a/Makefile
+++ b/Makefile
@@ -2176,6 +2176,8 @@ gettext.sp gettext.s gettext.o: EXTRA_CPPFLAGS = \
 http-push.sp http.sp http-walker.sp remote-curl.sp imap-send.sp: SPARSE_FLAGS += \
 	-DCURL_DISABLE_TYPECHECK
 
+pack-revindex.sp: SPARSE_FLAGS += -Wno-memcpy-max-count
+
 ifdef NO_EXPAT
 http-walker.sp http-walker.s http-walker.o: EXTRA_CPPFLAGS = -DNO_EXPAT
 endif
-- 
2.16.0