没有锵在结构未初始化的警告场 [英] No Clang warning for uninitialized field in struct

问题描述

考虑以下结构：

typedef struct foo {
    int a;
    int b;
} foo;

我的编译器的问题为下面的语句没有警告：

My compiler issues no warning for the following statement:

foo m = {300}

为什么没有发出警告？我期望的警告，因为我还没有对结构的决赛场上提供的任何值。

Why is no warning emitted? I expected a warning, since I have not provided any value for the final field of the struct.

下面是我的编译器调用：

Here is my compiler invocation:

gcc -Wall -Wpadded -Wuninitialized -g bar.c

下面是我的gcc版本：

Here is my gcc version:

Apple LLVM version 6.0 (clang-600.0.57) (based on LLVM 3.5svn)
Target: x86_64-apple-darwin15.0.0
Thread model: posix

请问flipped_move场只包含垃圾？这安全吗？

Will the flipped_move field just contain garbage? Is this safe?

推荐答案

-Wmissing场初始化值会警告你在你的结构初始化缺少字段初始化。

-Wmissing-field-initializers will warn you about missing field initializers in your struct initialization.

然而，它看起来像铿锵该标志的不会警告你，如果你选择初始化结构没有值。
例如：

However, it looks like on clang that flag won't warn you if you choose to initialize a struct with no values. For example

struct foo{
  int a;
};

int main(int argc, char **argv) {
  struct foo f = {};
  return 0;
}

将发出任何警告，即使 -Wmissing场初始化值上。如果您想在这种情况下，警告以及您应该添加 -Wgnu空初始值设定。

Will emit no warnings even with -Wmissing-field-initializers on. If you'd like warnings in this case as well you should add the -Wgnu-empty-initializer.

虽然你问铛，这也适用于GCC

当你在 -Wmissing场初始化值通过GCC将发出警告，这两种情况。没有 -Wgnu空初始值设定标志GCC。

Although you asked about clang, this also works in GCC
GCC will emit warnings for both cases when you pass in -Wmissing-field-initializers. There is no -Wgnu-empty-initializer flag for GCC.

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