This is a GNU extension to C99:

void foo(int n)
{
  struct S { int x[n]; };
}

It is not mentioned in the C Extensions section of the manual.


-- 
           Summary: GNU VLA-in-structure extension is undocumented
           Product: gcc
           Version: 4.4.0
            Status: UNCONFIRMED
          Severity: minor
          Priority: P3
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: drow at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37428

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