/* { 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-error "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-error "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" { xfail *-*-* } } */ } }