函数的隐式声明 - C99
我目前使用的是 Xcode 4，在我的 .pch 文件中我有这个宏： #define localize(s) NSLocalizedString((s), nil)。
当我尝试在某些 .m 文件中使用此宏时，我收到此警告：函数“localize”的隐式声明在 C99 中无效。
这段代码编译没有问题，但是我该如何解决这个问题以免收到警告？
I am currently using Xcode 4, and in my .pch file I have this macro:#define localize(s) NSLocalizedString((s), nil).
When I try to use this macro in some .m file, I receive this warning: Implicit declaration of function 'localize' is invalid in C99.
This code compiles without a problem, but how can I fix this so I don't get a warning?
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当我用 DLog 全局替换 NSLog 时遇到了这个问题。我愚蠢地包含了这些
语句，所以我最终
导致了警告和链接器错误。
I had this problem when I did a global replace of NSLog with DLog. I foolishly included the
statements, so I ended up with
which caused the warnings, and a linker error.
隐式函数声明是编译器第一次看到用作函数调用的声明（与首先看到原型或函数定义的声明相反）。
显然您的代码使用了
localize(foo)但宏定义不可见。可能的原因：您忘记#include包含localize宏的文件，或者标头的预编译出错，没有包含localize宏，因此它没有展开。Implicit function declarations are those that the compiler sees the first time used as a function call (as opposed to those where a prototype or the function definition is seen first).
Apparently your code used
localize(foo)but the macro definition was not visible. Possible reasons: you forgot to#includethe file containing thelocalizemacro or the precompilation of headers went south an did not include thelocalizemacro so it was left unexpanded.我遇到的另一个“愚蠢”错误是我的 DLog 是在 iOS 目标的前缀标头中定义的，因此我也必须将其复制到 OSX 目标的前缀......
Another "foolish" mistake I ran into was the fact that my DLog was defined in the prefix header of the iOS target, so I had to copy it over to the prefix of the OSX target, as well...
我遇到这个问题是因为我不小心导入了 CocoaLumberjack，如下所示：
显然 CocoaLumberjack 团队对代码进行了更多模块化；像
DDLogError这样的宏现在在它们自己的头文件中单独定义。我用这个替换了导入语句，错误消失了：
I had this problem because I accidentally imported CocoaLumberjack like this:
Apparently the CocoaLumberjack team modularized the code some more; and macros like
DDLogErrorare now defined separately in their own header file.I replaced the import statement with this and the error went away:
就我而言，只有一个文件出现此错误。结果我将它添加到了项目的测试目标成员资格中（在右侧的文件检查器中）。
In my case only one file was giving this error. Turned out that I added it to the project's tests target membership (in the File Inspector on the right).