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From: "msebor at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/96554] -Wall does not include
 -Wnull-dereference
Date: Mon, 10 Aug 2020 15:50:31 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D96554

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=3D               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
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  /src/gcc/trunk/gcc/calls.c:1960
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  /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
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  /src/gcc/trunk/gcc/cgraphclones.c:186
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  /src/gcc/trunk/gcc/cgraph.h:1350
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  /src/gcc/trunk/gcc/cgraph.h:3212
  /src/gcc/trunk/gcc/cgraph.h:3250
  /src/gcc/trunk/gcc/cgraph.h:3375
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  /src/gcc/trunk/gcc/cgraph.h:3585
  /src/gcc/trunk/gcc/cgraphunit.c:1419
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  /src/gcc/trunk/gcc/cgraphunit.c:626
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  /src/gcc/trunk/gcc/config/i386/i386-features.c:690
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  /src/gcc/trunk/gcc/coverage.c:335
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  /src/gcc/trunk/gcc/cp/cp-tree.h:1530
  /src/gcc/trunk/gcc/cp/cp-tree.h:1537
  /src/gcc/trunk/gcc/cp/cp-tree.h:731
  /src/gcc/trunk/gcc/cp/decl2.c:5076
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  /src/gcc/trunk/gcc/cp/parser.c:20725
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  /src/gcc/trunk/gcc/cp/parser.c:31572
  /src/gcc/trunk/gcc/cp/pt.c:10709
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  /src/gcc/trunk/gcc/cp/tree.c:3780
  /src/gcc/trunk/gcc/df.h:1198
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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=3D86172
[Bug 86172] [meta-bug] issues with -Wnull-dereference=