C++ pure virtual base class memory consumption

[fueb <fueb at gmx dot net>]

Hi out there, I hope someone can give me a hint on a problem building a c++
static library using newlib and lpcxpresso. Everything works fine, but I
have a size-problem.

I have got a class that has pure virtual methods. Another class derives this
base class and implements the function:

Code:

class A {
 public:
   virtual void method() = 0;
}
class B : public A {
   virtual void method() { // do something } 
 }

Using the above code links appr. 60kB more code from newlib into the
application than if I use the following code, where the base class method is
already implemented but overwritten in the derived class:

Code:

class A {
 public:
   virtual void method() {} // <-- the only change
}
class B : public A {
   virtual void method() { // do something } 
}

I know that gcc for other small devices is capable to build this with
smaller code, probably with a commandline switch, but I do not know how.

Does someone have a hint on how I could prevent the compiler to
auto-implement that much functions used for the pure virtual class? 
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