clang/test/Sema/flexible-array-init.c

   1 // RUN: %clang_cc1 -fsyntax-only -pedantic -verify %s
   2 struct one {
   3   int a;
   4   int values[]; // expected-note 4{{initialized flexible array member 'values' is here}}
   5 } x = {5, {1, 2, 3}}; // expected-warning{{flexible array initialization is a GNU extension}}
   6
   7 struct one x2 = { 5, 1, 2, 3 }; // expected-warning{{flexible array initialization is a GNU extension}}
   8
   9 void test(void) {
  10   struct one x3 = {5, {1, 2, 3}}; // expected-error{{initialization of flexible array member is not allowed}}
  11   struct one x3a = { 5 };
  12   struct one x3b = { .a = 5 };
  13   struct one x3c = { 5, {} }; // expected-warning{{use of an empty initializer is a C23 extension}} \
  14   // expected-warning{{flexible array initialization is a GNU extension}} \
  15   // expected-warning{{zero size arrays are an extension}}
  16 }
  17
  18 struct foo {
  19   int x;
  20   int y[]; // expected-note 8 {{initialized flexible array member 'y' is here}}
  21 };
  22 struct bar { struct foo z; }; // expected-warning {{'z' may not be nested in a struct due to flexible array member}}
  23
  24 struct foo a = { 1, { 2, 3, 4 } };        // expected-warning{{flexible array initialization is a GNU extension}}
  25 struct bar b = { { 1, { 2, 3, 4 } } };    // expected-error{{initialization of flexible array member is not allowed}}
  26 struct bar c = { { 1, { } } };            // // expected-warning{{flexible array initialization is a GNU extension}} \
  27               // expected-warning{{use of an empty initializer is a C23 extension}} \
  28               // expected-warning{{zero size arrays are an extension}}
  29 struct foo d[1] = { { 1, { 2, 3, 4 } } };  // expected-warning{{'struct foo' may not be used as an array element due to flexible array member}} \
  30               // expected-error{{initialization of flexible array member is not allowed}}
  31
  32 struct foo desig_foo = { .y = {2, 3, 4} }; // expected-warning{{flexible array initialization is a GNU extension}}
  33 struct bar desig_bar = { .z.y = { } }; // expected-warning{{use of an empty initializer is a C23 extension}} \
  34   // expected-warning{{zero size arrays are an extension}} \
  35   // expected-warning{{flexible array initialization is a GNU extension}}
  36 struct bar desig_bar2 = { .z.y = { 2, 3, 4} }; // expected-error{{initialization of flexible array member is not allowed}}
  37 struct foo design_foo2 = { .y = 2 }; // expected-error{{flexible array requires brace-enclosed initializer}}
  38
  39 struct point {
  40   int x, y;
  41 };
  42
  43 struct polygon {
  44   int numpoints;
  45   struct point points[]; // expected-note{{initialized flexible array member 'points' is here}}
  46 };
  47 struct polygon poly = {
  48   .points[2] = { 1, 2} }; // expected-error{{designator into flexible array member subobject}}
  49
  50 // PR3540
  51 struct X {
  52   int a;
  53   int b;
  54   char data[];
  55 };
  56
  57 struct Y {
  58   int a:4;
  59   int b:4;
  60   int c;
  61   int d;
  62   int e;
  63   struct X xs[]; // expected-warning{{'struct X' may not be used as an array element due to flexible array member}}
  64 };
  65
  66
  67 // PR8217
  68 struct PR8217a {
  69   int  i;
  70   char v[]; // expected-note 2 {{initialized flexible array member 'v' is here}}
  71 };
  72
  73 void PR8217(void) {
  74   struct PR8217a foo1 = { .i = 0, .v = "foo" }; // expected-error {{initialization of flexible array member is not allowed}}
  75   struct PR8217a foo2 = { .i = 0 };
  76   struct PR8217a foo3 = { .i = 0, .v = { 'b', 'a', 'r', '\0' } }; // expected-error {{initialization of flexible array member is not allowed}}
  77   struct PR8217a bar;
  78 }
  79
  80 typedef struct PR10648 {
  81  unsigned long n;
  82  int v[]; // expected-note {{initialized flexible array member 'v' is here}}
  83 } PR10648;
  84 int f10648(void) {
  85   return (PR10648){2, {3, 4}}.v[1]; // expected-error {{initialization of flexible array member is not allowed}}
  86 }
  87
  88 struct FlexWithUnnamedBitfield { int : 10; int x; int y[]; }; // expected-note {{initialized flexible array member 'y' is here}}
  89 void TestFlexWithUnnamedBitfield(void) {
  90   struct FlexWithUnnamedBitfield x = {10, {3}}; // expected-error {{initialization of flexible array member is not allowed}}
  91 }