不，那里使用纯C没什么问题。通常，源文件将被命名为 *。c 而不是 *。m ，但是将 *。c 重命名为 *。m 应该不会引起错误。

No, there is no problem with using pure C. Usually, the source files will be named *.c instead of *.m, but renaming *.c to *.m shouldn't cause errors.

但是，有一个线索：

Operation（MyStruct）$ c $从 x

Operation(MyStruct) referenced from x

引用的c>如果链接器知道函数的类型参数，这是因为您正在从C ++代码中调用函数。您将必须在标题中放入 extern C {...} ，如下所示：

If the linker knows the type of the function parameters, it's because you're calling the function from C++ code. You will have to put extern "C" { ... } in the header as follows:

#ifdef __cplusplus
extern "C" {
#endif

typedef struct
{
    float n;
} MyStruct;

float Operation(MyStruct ms);

#ifdef __cplusplus
}
#endif

如果您的项目中没有任何C ++（包括Objective-C ++ *。mm 文件），那么这不是您的问题。

If you don't have any C++ in your project (including Objective-C++ *.mm files), then this isn't your problem.