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/* { dg-do compile } */

/* { dg-options "" } */

/* Check compatibility of array declarations.  */

/* Incomplete decl matches.  */

extern char arr0[];

char arr0[1];

/* Two integral expressions must be the same.  Note that 0 is

   a gcc extension, but it should work like any other constant.  */

extern char arr1[1];

char arr1[1];

extern char arr2[0];

char arr2[0];

extern char arr3[0];            /* { dg-message "note: previous declaration" } */

char arr3[1];                   /* { dg-error "conflicting types" } */

/* Variable size matches.  */

void func(int n, int m)

{

  /* The next two are from the example in c99 6.7.5.2/9.  */

  {

    /* Invalid: not compatible because 4 != 6.  */

    int a[n][6][m];

    int (*p)[4][n+1];

    p = a;                      /* { dg-warning "incompatible" } */

  }

  {

    /* Compatible, but defined behavior only if n == 6 and m == n+1.  */

    int c[n][n][6][m];

    int (*r)[n][n][n+1];

    r = c;

  }

  {

    /* Compatible, but undefined behavior; (2, 2) is not a constant

       expression, and thus A is a VLA.  */

    int a[6][(2, 2)];

    int (*p)[3];

    p = a; /* { dg-bogus "incompatible" "bad vla handling" } */

  }

}