c - -Wmissing-field-initializer 使用指定的初始值设定项时

Question

我正在使用 GCC 4.6.2 (Mingw) 并使用 -Wextra 进行编译。每当我使用指定的初始值设定项时，我都会收到奇怪的警告。对于以下代码

typedef struct
{
  int x;
  int y;
} struct1;

typedef struct
{
  int x;
  int y;
} struct2;

typedef struct
{
  struct1 s1;
  struct2 s2[4];

} bug_struct;

bug_struct bug_struct1 =
{
  .s1.x = 1,
  .s1.y = 2,

  .s2[0].x = 1,
  .s2[0].y = 2,

  .s2[1].x = 1,
  .s2[1].y = 2,

  .s2[2].x = 1,
  .s2[2].y = 2,

  .s2[3].x = 1,
  .s2[3].y = 2,
};

我收到警告

bug.c:24:3: warning: missing initializer [-Wmissing-field-initializers]
bug.c:24:3: warning: (near initialization for 'bug_struct1.s1.y') [-Wmissing-field-initializers]

那么到底缺少了什么？我已经初始化了每个成员。这个警告是否过于生硬而无法使用指定的初始化程序，我做错了什么，还是编译器错误？

Answer 1

看来，正如您所说，警告“太生硬了”。

这种访问模式，将每个成员结构初始化为一个整体，满足编译器:

bug_struct bug_struct1 =
{
    .s1 = {.x = 1, .y = 2},
    .s2[0] = {.x = 1, .y = 2},
    .s2[1] = {.x = 1, .y = 2},
    .s2[2] = {.x = 1, .y = 2},
    .s2[3] = {.x = 1, .y = 2}
};