llvm-project/clang/test/Sema/vla.c

// RUN: clang %s -verify -fsyntax-only

int test1() {
  typedef int x[test1()];  // vla
  static int y = sizeof(x);  // expected-error {{not a compile-time constant}}
}

// PR2347
void f (unsigned int m)
{
  int e[2][m];

  e[0][0] = 0;
}

// PR3048
int x = sizeof(struct{char qq[x];}); // expected-error {{fields must have a constant size}}

// PR2352
void f2(unsigned int m)
{
  extern int e1[2][m]; // expected-error {{variable length array declaration can not have 'extern' linkage}}

  e1[0][0] = 0;
  
}

// PR2361
int i; 
int c[][i]; // expected-error {{variably modified type declaration not allowed at file scope}}
int d[i]; // expected-error {{variable length array declaration not allowed at file scope}}

int (*e)[i]; // expected-error {{variably modified type declaration not allowed at file scope}}

void f3()
{
  static int a[i]; // expected-error {{variable length array declaration can not have 'static' storage duration}}
  extern int b[i]; // expected-error {{variable length array declaration can not have 'extern' linkage}}

  extern int (*c1)[i]; // expected-error {{variably modified type declaration can not have 'extern' linkage}}
  static int (*d)[i];
}