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* [Bug target/89788] trunk/liboffloadmic/runtime/emulator/coi_host.cpp:175]: (error) Null pointer dereference (missed -Wnull-dereference)
[not found] <bug-89788-4@http.gcc.gnu.org/bugzilla/>
@ 2020-06-08 19:57 ` msebor at gcc dot gnu.org
2022-11-04 10:55 ` tschwinge at gcc dot gnu.org
1 sibling, 0 replies; 2+ messages in thread
From: msebor at gcc dot gnu.org @ 2020-06-08 19:57 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89788
Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |msebor at gcc dot gnu.org
Blocks|86172 |
--- Comment #5 from Martin Sebor <msebor at gcc dot gnu.org> ---
The code is still in liboffloadmic/runtime/emulator/coi_host.cpp but I wonder
why it isn't diagnosed. Passing a null pointer of any other type but char* to
%s is diagnosed by -Wformat. Usually only with optimization, passing a null
pointer to %s is then diagnosed by -Wformat-overflow. A test case for the
latter is below.
Could something like -Wno-system-headers be somehow disablig it?
$ cat pr89788.c && gcc -O2 -S -Wall -Wextra pr89788.c
#include <dirent.h>
#include <stdio.h>
void f (const char *path)
{
DIR *p = opendir (path);
if (!p)
fprintf (stderr, "error: %s", (char*)p);
}
pr89788.c: In function ‘f’:
pr89788.c:8:5: warning: ‘%s’ directive argument is null [-Wformat-overflow=]
8 | fprintf (stderr, "error: %s", (char*)p);
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86172
[Bug 86172] [meta-bug] issues with -Wnull-dereference
^ permalink raw reply [flat|nested] 2+ messages in thread
* [Bug target/89788] trunk/liboffloadmic/runtime/emulator/coi_host.cpp:175]: (error) Null pointer dereference (missed -Wnull-dereference)
[not found] <bug-89788-4@http.gcc.gnu.org/bugzilla/>
2020-06-08 19:57 ` [Bug target/89788] trunk/liboffloadmic/runtime/emulator/coi_host.cpp:175]: (error) Null pointer dereference (missed -Wnull-dereference) msebor at gcc dot gnu.org
@ 2022-11-04 10:55 ` tschwinge at gcc dot gnu.org
1 sibling, 0 replies; 2+ messages in thread
From: tschwinge at gcc dot gnu.org @ 2022-11-04 10:55 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89788
Thomas Schwinge <tschwinge at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target|i?86-intelmic |
CC| |tschwinge at gcc dot gnu.org
--- Comment #6 from Thomas Schwinge <tschwinge at gcc dot gnu.org> ---
This liboffloadmic code is gone after commit
r13-3652-ge4cba49413ca429dc82f6aa2e88129ecb3fdd943 "Remove support for Intel
MIC offloading", but I'm leaving this PR open, as it's not specifically about
liboffloadmic code, but rather about a missing GCC compile-time diagnostic, as
I understand this.
^ permalink raw reply [flat|nested] 2+ messages in thread
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[not found] <bug-89788-4@http.gcc.gnu.org/bugzilla/>
2020-06-08 19:57 ` [Bug target/89788] trunk/liboffloadmic/runtime/emulator/coi_host.cpp:175]: (error) Null pointer dereference (missed -Wnull-dereference) msebor at gcc dot gnu.org
2022-11-04 10:55 ` tschwinge at gcc dot gnu.org
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