[Bug c/96554] New: -Wall does not include -Wnull-dereference

[Bug c/96554] New: -Wall does not include -Wnull-dereference

[R.E.Wolff at BitWizard dot nl]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96554

            Bug ID: 96554
           Summary: -Wall does not include -Wnull-dereference
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: R.E.Wolff at BitWizard dot nl
  Target Milestone: ---

As reported in c/96550, the fact that -Wall didn't include -Wnull-dereference
cost me a lot of time in trying to figure out what the problem was with my
code. 

I add -Wall to get lots of warnings about potential bugs. if (a = 3) is an
example where a simple typo in the code leads to perfectly valid C, but such a
"high likelyhood of a bug" that a warning is warranted. 

Same here: I wrote a bug that caused the compiler to a) not warn me and b) do
unexpected things. I think the -Wnull-dreference is a valid warning to enable
with -Wall.

[Bug c/96554] -Wall does not include -Wnull-dereference

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96554

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jakub at gcc dot gnu.org

--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
This warning is intentionally not enabled at -Wall, because it has too many
false positives (technically correct warnings, but about dead code).
See e.g. https://gcc.gnu.org/bugzilla/show_bug.cgi?id=16351#c35

[Bug c/96554] -Wall does not include -Wnull-dereference

[R.E.Wolff at BitWizard dot nl]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96554

--- Comment #2 from Roger Wolff <R.E.Wolff at BitWizard dot nl> ---
In my case it promotes a function I didn't declare as <does not return> into
one that <does not return> and thereby it caused 80% of my code to become
"dead". It'd be nice to differentiate between the case where a simple
optimization removes a few lines of code due to an extra null-check not being
reachable due to the trap  on the null dereference and the case where big
unexpected things start happening. 

Maybe the promotion of a function from "does return" to "does not return" is
something you might warn about. This satisfies the "you can easily modify the
code to silence the warning".

[Bug c/96554] -Wall does not include -Wnull-dereference

[schwab@linux-m68k.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96554

--- Comment #3 from Andreas Schwab <schwab@linux-m68k.org> ---
*** Bug 96550 has been marked as a duplicate of this bug. ***

[Bug c/96554] -Wall does not include -Wnull-dereference

[R.E.Wolff at BitWizard dot nl]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96554

--- Comment #4 from Roger Wolff <R.E.Wolff at BitWizard dot nl> ---
Update: LTO messes with the warning. When LTO is enabled, the warning from
-Wnull-dreference is suppressed.

[Bug tree-optimization/96554] -Wall does not include -Wnull-dereference

[msebor at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96554

Martin Sebor <msebor at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |msebor at gcc dot gnu.org
   Last reconfirmed|                            |2020-08-10
          Component|c                           |tree-optimization
             Blocks|                            |86172
             Status|UNCONFIRMED                 |NEW
     Ever confirmed|0                           |1

--- Comment #5 from Martin Sebor <msebor at gcc dot gnu.org> ---
The latest trunk of GCC 11 has over 700 distinct instances of the
-Wnull-dereference warning so some work is still needed before it can be
enabled in either -Wextra or -Wall.  Here's the breakdown:

Diagnostic                        Count   Unique    Files
-Wnull-dereference                 3862      713      168
-Wimplicit-fallthrough=               4        1        1
-Wstringop-truncation                 3        1        1
-Wreturn-local-addr                   2        1        1
-Wmaybe-uninitialized                 2        2        2

-Wnull-dereference Instances:
  cc1plus: warning: potential null pointer dereference [-Wnull-dereference]
  /src/gcc/trunk/gcc/analyzer/checker-path.cc:737
  /src/gcc/trunk/gcc/analyzer/checker-path.cc:745
  /src/gcc/trunk/gcc/analyzer/checker-path.cc:958
  /src/gcc/trunk/gcc/analyzer/diagnostic-manager.cc:339
  /src/gcc/trunk/gcc/analyzer/diagnostic-manager.cc:456
  /src/gcc/trunk/gcc/analyzer/diagnostic-manager.cc:777
  /src/gcc/trunk/gcc/analyzer/diagnostic-manager.cc:778
  /src/gcc/trunk/gcc/analyzer/engine.cc:1844
  /src/gcc/trunk/gcc/analyzer/engine.cc:2683
  /src/gcc/trunk/gcc/analyzer/engine.cc:3570
  /src/gcc/trunk/gcc/analyzer/engine.cc:3656
  /src/gcc/trunk/gcc/analyzer/engine.cc:834
  /src/gcc/trunk/gcc/analyzer/exploded-graph.h:263
  /src/gcc/trunk/gcc/analyzer/program-point.h:225
  /src/gcc/trunk/gcc/analyzer/program-state.cc:134
  /src/gcc/trunk/gcc/analyzer/program-state.cc:241
  /src/gcc/trunk/gcc/analyzer/program-state.cc:266
  /src/gcc/trunk/gcc/analyzer/program-state.cc:267
  /src/gcc/trunk/gcc/analyzer/program-state.cc:472
  /src/gcc/trunk/gcc/analyzer/program-state.cc:473
  /src/gcc/trunk/gcc/analyzer/program-state.cc:488
  /src/gcc/trunk/gcc/analyzer/program-state.cc:489
  /src/gcc/trunk/gcc/analyzer/program-state.cc:514
  /src/gcc/trunk/gcc/analyzer/program-state.cc:584
  /src/gcc/trunk/gcc/analyzer/program-state.cc:585
  /src/gcc/trunk/gcc/analyzer/region-model.cc:1486
  /src/gcc/trunk/gcc/analyzer/region-model.cc:1571
  /src/gcc/trunk/gcc/analyzer/region-model.cc:2126
  /src/gcc/trunk/gcc/analyzer/region-model.cc:2606
  /src/gcc/trunk/gcc/analyzer/region-model.cc:424
  /src/gcc/trunk/gcc/analyzer/region-model.h:1195
  /src/gcc/trunk/gcc/analyzer/region-model.h:121
  /src/gcc/trunk/gcc/analyzer/region-model.h:129
  /src/gcc/trunk/gcc/analyzer/region-model.h:1583
  /src/gcc/trunk/gcc/analyzer/region-model.h:1587
  /src/gcc/trunk/gcc/analyzer/region-model.h:484
  /src/gcc/trunk/gcc/analyzer/region-model.h:869
  /src/gcc/trunk/gcc/analyzer/region-model.h:882
  /src/gcc/trunk/gcc/analyzer/region-model.h:912
  /src/gcc/trunk/gcc/analyzer/state-purge.h:95
  /src/gcc/trunk/gcc/analyzer/supergraph.cc:177
  /src/gcc/trunk/gcc/analyzer/supergraph.cc:198
  /src/gcc/trunk/gcc/analyzer/supergraph.cc:221
  /src/gcc/trunk/gcc/analyzer/supergraph.cc:240
  /src/gcc/trunk/gcc/analyzer/supergraph.h:106
  /src/gcc/trunk/gcc/analyzer/supergraph.h:126
  /src/gcc/trunk/gcc/analyzer/supergraph.h:132
  /src/gcc/trunk/gcc/analyzer/supergraph.h:138
  /src/gcc/trunk/gcc/analyzer/supergraph.h:144
  /src/gcc/trunk/gcc/analyzer/supergraph.h:163
  /src/gcc/trunk/gcc/auto-profile.c:1517
  /src/gcc/trunk/gcc/bb-reorder.c:467
  /src/gcc/trunk/gcc/bitmap.h:393
  /src/gcc/trunk/gcc/bitmap.h:532
  /src/gcc/trunk/gcc/bitmap.h:576
  /src/gcc/trunk/gcc/bitmap.h:579
  /src/gcc/trunk/gcc/caller-save.c:906
  /src/gcc/trunk/gcc/calls.c:1960
  /src/gcc/trunk/gcc/c/c-parser.c:4442
  /src/gcc/trunk/gcc/c-family/c-ada-spec.c:1905
  /src/gcc/trunk/gcc/c-family/c-attribs.c:3906
  /src/gcc/trunk/gcc/c-family/c-common.c:721
  /src/gcc/trunk/gcc/cfg.c:338
  /src/gcc/trunk/gcc/cfgcleanup.c:2143
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  /src/gcc/trunk/gcc/cfgloop.c:332
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  /src/gcc/trunk/gcc/cgraphbuild.c:403
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  /src/gcc/trunk/gcc/cgraph.c:3298
  /src/gcc/trunk/gcc/cgraph.c:3848
  /src/gcc/trunk/gcc/cgraph.c:3875
  /src/gcc/trunk/gcc/cgraphclones.c:186
  /src/gcc/trunk/gcc/cgraphclones.c:259
  /src/gcc/trunk/gcc/cgraph.h:1350
  /src/gcc/trunk/gcc/cgraph.h:1356
  /src/gcc/trunk/gcc/cgraph.h:2189
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  /src/gcc/trunk/gcc/cgraph.h:3097
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  /src/gcc/trunk/gcc/cp/parser.c:20725
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  /src/gcc/trunk/gcc/vec.h:1297
  /src/gcc/trunk/gcc/vec.h:1298
  /src/gcc/trunk/gcc/vec.h:1416
  /src/gcc/trunk/gcc/vec.h:1422
  /src/gcc/trunk/gcc/vec.h:1444
  /src/gcc/trunk/gcc/vec.h:1450
  /src/gcc/trunk/gcc/vec.h:1866
  /src/gcc/trunk/gcc/vec.h:579
  /src/gcc/trunk/gcc/vec.h:878
  /src/gcc/trunk/gcc/vec.h:889
  /src/gcc/trunk/gcc/vec.h:904
  /src/gcc/trunk/gcc/vec.h:919
  /src/gcc/trunk/libcpp/include/line-map.h:589
  /src/gcc/trunk/libcpp/macro.c:1588
  /src/gcc/trunk/libcpp/macro.c:2079
  /src/gcc/trunk/libcpp/macro.c:2117
  /src/gcc/trunk/libiberty/cp-demangle.c:2457
  /src/gcc/trunk/libiberty/cp-demangle.c:2657
  /src/gcc/trunk/libiberty/cp-demangle.c:2662
  /src/gcc/trunk/libiberty/cp-demangle.c:2667
  /src/gcc/trunk/libiberty/cp-demangle.c:2672
  /src/gcc/trunk/libiberty/cp-demangle.c:2677
  /src/gcc/trunk/libiberty/cp-demangle.c:2682
  /src/gcc/trunk/libiberty/cp-demangle.c:2687
  /src/gcc/trunk/libiberty/cp-demangle.c:2693
  /src/gcc/trunk/libiberty/cp-demangle.c:2694
  /src/gcc/trunk/libiberty/cp-demangle.c:2713
  /src/gcc/trunk/libiberty/obstack.c:210
  /src/gcc/trunk/libiberty/obstack.c:211


Referenced Bugs:

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86172
[Bug 86172] [meta-bug] issues with -Wnull-dereference

[Bug tree-optimization/96554] -Wall does not include -Wnull-dereference

[rsandifo at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96554

rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |rsandifo at gcc dot gnu.org

--- Comment #6 from rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> ---
(In reply to Martin Sebor from comment #5)
> The latest trunk of GCC 11 has over 700 distinct instances of the
> -Wnull-dereference warning so some work is still needed before it can be
> enabled in either -Wextra or -Wall.  Here's the breakdown:

It'd be interesting to know how many would still be caught by a
“must” version of the option, if it was split into a may/must pair
(as per earlier suggestions in Wnull-dereference).  Maybe we could
emulate that by sticking in a postdominannce test and rerunning
the numbers…