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* [glibc] Disable spurious -Warray-bounds for ypclnt.c (bug 26687)
@ 2020-10-30 21:40 Joseph Myers
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From: Joseph Myers @ 2020-10-30 21:40 UTC (permalink / raw)
To: glibc-cvs
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=882774658cb8daee4c16677a3fd674f6052cc157
commit 882774658cb8daee4c16677a3fd674f6052cc157
Author: Joseph Myers <joseph@codesourcery.com>
Date: Fri Oct 30 21:40:25 2020 +0000
Disable spurious -Warray-bounds for ypclnt.c (bug 26687)
Included among the GCC 11 warnings listed in bug 26687, but not fixed
when that bug was marked as FIXED, are -Warray-bounds warnings in
nis/ypclnt.c. These are all for different calls to the same piece of
code, which already has a comment explaining that the element accessed
is in a common prefix of the various structures. On the basis of that
comment, this patch treats the warning as a false positive and
disables it for that code.
Tested with build-many-glibcs.py for arm-linux-gnueabi, where,
together with my previous two patches, this allows the build of glibc
to complete with GCC 11 (further build failures appear in the
testsuite).
Reviewed-by: DJ Delorie <dj@redhat.com>
Diff:
---
nis/ypclnt.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/nis/ypclnt.c b/nis/ypclnt.c
index ada08bf982..898f8143e9 100644
--- a/nis/ypclnt.c
+++ b/nis/ypclnt.c
@@ -30,6 +30,7 @@
#include <sys/uio.h>
#include <libc-lock.h>
#include <shlib-compat.h>
+#include <libc-diag.h>
/* This should only be defined on systems with a BSD compatible ypbind */
#ifndef BINDINGDIR
@@ -368,12 +369,19 @@ do_ypcall_tr (const char *domain, u_long prog, xdrproc_t xargs,
caddr_t req, xdrproc_t xres, caddr_t resp)
{
int status = do_ypcall (domain, prog, xargs, req, xres, resp);
+ DIAG_PUSH_NEEDS_COMMENT;
+ /* This cast results in a warning that a ypresp_val is partly
+ outside the bounds of the actual object referenced, but as
+ explained below only the stat element (in a common prefix) is
+ accessed. */
+ DIAG_IGNORE_NEEDS_COMMENT (11, "-Warray-bounds");
if (status == YPERR_SUCCESS)
/* We cast to ypresp_val although the pointer could also be of
type ypresp_key_val or ypresp_master or ypresp_order or
ypresp_maplist. But the stat element is in a common prefix so
this does not matter. */
status = ypprot_err (((struct ypresp_val *) resp)->stat);
+ DIAG_POP_NEEDS_COMMENT;
return status;
}
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2020-10-30 21:40 [glibc] Disable spurious -Warray-bounds for ypclnt.c (bug 26687) Joseph Myers
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