[英]How do I suppress C++ vtable generation for pure virtual classes using G++?
Supressing C++ vtable generation can be done in MSVC using the __declspec(novtable)
attribute. 可以使用
__declspec(novtable)
属性在MSVC中完成C ++ vtable的生成。 However, it seems that there is no equivalent attribute for the GNU C++ compiler. 但是,似乎GNU C ++编译器没有等效属性 。 The fact is that leaving the vtables for pure virtual classes unnecessarily links in
__cxa_abort()
and many others, and I want to avoid this happening because I'm programming for an embedded system. 事实是,将纯虚拟类的vtable不必要地链接到
__cxa_abort()
和许多其他类中,并且我想避免这种情况的发生,因为我正在为嵌入式系统编程。 So, what should I do? 所以我该怎么做?
struct ISomeInterface
{
virtual void Func() = 0;
};
class CSomeClass : public ISomeInterface
{
virtual void Func();
}
void CSomeClass::Func()
{
//...
}
There is something that will achieve a similar result: #pragma interface
. 有一些可以达到类似结果的东西:
#pragma interface
。
#pragma implementation
can override this, however. #pragma implementation
可以覆盖此设置。
http://www.emerson.emory.edu/services/gcc/html/CPP_Interface.html http://www.emerson.emory.edu/services/gcc/html/CPP_Interface.html
The compiler flag -fno-rtti
stops run-time type information generation. 编译器标志
-fno-rtti
停止运行时类型信息的生成。
In my experience with C++ on embedded platforms, this has prevented vtable compiler errors from occurring, suggesting it prevents them from being created (and consequentially, virtual functions won't work). 根据我在嵌入式平台上使用C ++的经验,这防止了vtable编译器错误的发生,这表明它阻止了它们的创建(因此,虚函数将不起作用)。
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