初始化器周围缺少大括号答案

【问题标题】：missing braces around initializer初始化器周围缺少大括号
【发布时间】：2011-09-05 01:18:22
【问题描述】：

编译器是 MPLAB 8 下的 GCC，dsPIC33 ver 3.30c

// Note: the first block below generates no error's with the compiler, but the data
//  in the structurer is wrong.
//  the 2nd block give warning, but the data is correct... why??
//      NMEA2000.c:289: warning: missing braces around initializer
//      NMEA2000.c:289: warning: (near initialization for 'static_can_filter[0]')

const tSCF static_can_filter[] = {
    {(uint32) 0x01FFFFFF}, {(uint8) 2}, // Filter 0 (Process data)
    {(uint32) 0x00000000}, {(uint8) 2}, // Filter 1       
    {(uint32) 0x00000000}, {(uint8) 2}, // Filter 2 (receive P2P-Message)
    {(uint32) 0x0000FF00}, {(uint8) 2}, // Filter 3 (receive P2P-Message)
    {(uint32) 0x00000000}, {(uint8) 2}, // Filter 4
    {(uint32) 0x00000000}, {(uint8) 2}, // Filter 5
    {(uint32) 0x00000000}, {(uint8) 2}, // Filter 6
    {(uint32) 0x00000000}, {(uint8) 2}, // Filter 7
    {(uint32) 0x00000000}, {(uint8) 2}, // Filter 8
    {(uint32) 0x00000000}, {(uint8) 2}, // Filter 9
    {(uint32) 0x00000000}, {(uint8) 2}, // Filter 10
    {(uint32) 0x00000000}, {(uint8) 2}, // Filter 11
    {(uint32) 0x00000000}, {(uint8) 2}, // Filter 12
    {(uint32) 0x00000000}, {(uint8) 2}, // Filter 13
    {(uint32) 0x00000000}, {(uint8) 2}, // Filter 14
    (uint32) 0x00000000}, {(uint8) 2}   // Filter 15
};


const tSCF static_can_filter[] = {
    (uint32) 0x01FFFFFF, (uint8) 2, // Filter 0 (Process data)
    (uint32) 0x00000000, (uint8) 2, // Filter 1       
    (uint32) 0x00000000, (uint8) 2, // Filter 2 (receive P2P-Message)
    (uint32) 0x0000FF00, (uint8) 2, // Filter 3 (receive P2P-Message)
    (uint32) 0x00000000, (uint8) 2, // Filter 4
    (uint32) 0x00000000, (uint8) 2, // Filter 5
    (uint32) 0x00000000, (uint8) 2, // Filter 6
    (uint32) 0x00000000, (uint8) 2, // Filter 7
    (uint32) 0x00000000, (uint8) 2, // Filter 8
    (uint32) 0x00000000, (uint8) 2, // Filter 9
    (uint32) 0x00000000, (uint8) 2, // Filter 10
    (uint32) 0x00000000, (uint8) 2, // Filter 11
    (uint32) 0x00000000, (uint8) 2, // Filter 12
    (uint32) 0x00000000, (uint8) 2, // Filter 13
    (uint32) 0x00000000, (uint8) 2, // Filter 14
    (uint32) 0x00000000, (uint8) 2  // Filter 15
};

【问题讨论】：

标签： gcc mplab

【解决方案1】：

假设 tSCF 定义如下：

typedef struct tSCF {
  uint32 a;
  uint8 b;
} tSCF;

你想要的可能如下所示：

const tSCF static_can_filter[] = {
    { (uint32) 0x01FFFFFF, (uint8) 2 }, // Filter 0 (Process data)
    { (uint32) 0x00000000, (uint8) 2 }, // Filter 1
    [...]

每个带大括号的初始化器都会初始化数组的不同元素。您的问题{(uint32) 0x01FFFFFF}, {(uint8) 2}, 中的第一种形式最终构建了数组的两个成员（每个成员都将a 设置为给定值，b 设置为零）。您可以通过添加显式数组绑定来在示例中看到这一点（这将导致编译器抱怨过多的初始化程序。

您问题的第二种形式完全符合您的要求：当没有任何大括号并且数组元素是结构时，值将分配给连续的字段。这里有一个可选的警告（可能用-Wall 或类似的东西打开），因为这个答案中给出的表格让你的意图更清楚了。

【讨论】：

【解决方案2】：

您似乎错过了此行开头的{：

(uint32) 0x00000000}, {(uint8) 2}   // Filter 15

【讨论】：

他在代码中承认这一点（见顶部的评论）

【解决方案3】：

可能是文件中较高的未闭合大括号......我们需要在上下文中看到这一点 - 单独放入一个文件，您的第二个数组编译得很好。我使用查找和替换更改了类型，这不会产生任何错误或警告

gcc -c -Wall -Wextra

所以，错误一定在其他地方。

#include <stdint.h>
const uint32_t static_can_filter[] = {
    (uint32_t) 0x01FFFFFF, (uint8_t) 2, // Filter 0 (Process data)
    (uint32_t) 0x00000000, (uint8_t) 2, // Filter 1       
    (uint32_t) 0x00000000, (uint8_t) 2, // Filter 2 (receive P2P-Message)
    (uint32_t) 0x0000FF00, (uint8_t) 2, // Filter 3 (receive P2P-Message)
    (uint32_t) 0x00000000, (uint8_t) 2, // Filter 4
    (uint32_t) 0x00000000, (uint8_t) 2, // Filter 5
    (uint32_t) 0x00000000, (uint8_t) 2, // Filter 6
    (uint32_t) 0x00000000, (uint8_t) 2, // Filter 7
    (uint32_t) 0x00000000, (uint8_t) 2, // Filter 8
    (uint32_t) 0x00000000, (uint8_t) 2, // Filter 9
    (uint32_t) 0x00000000, (uint8_t) 2, // Filter 10
    (uint32_t) 0x00000000, (uint8_t) 2, // Filter 11
    (uint32_t) 0x00000000, (uint8_t) 2, // Filter 12
    (uint32_t) 0x00000000, (uint8_t) 2, // Filter 13
    (uint32_t) 0x00000000, (uint8_t) 2, // Filter 14
    (uint32_t) 0x00000000, (uint8_t) 2  // Filter 15
};

【讨论】：