[Bug c/116284] New: incorrect classification of zero-sized array as variably modified

Thu, 08 Aug 2024 00:37:19 -0700 

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116284

            Bug ID: 116284
           Summary: incorrect classification of zero-sized array as
                    variably modified
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: muecker at gwdg dot de
  Target Milestone: ---

In the following example we can an error because 'd' is classified as variably
modified.

static int a[0];
static int b[sizeof a];

void foo(int (*x)[*]);

static int c[0];
static int d[sizeof c];


<source>:11:12: error: variably modified 'd' at file scope
   11 | static int d[sizeof c];

https://godbolt.org/z/a8Ej6c5jr



Found by Alejandro Colomar.

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