Error compiling with GCC

Pavel Rosenboim pavelr at coresma.com
Mon Dec 15 08:31:53 UTC 2003


André Felício wrote:

> Hi,
> 
> I am trying to compile a simple program in C++ and I am not obtaining.  This 
> returning the following error:
> 
> [andre at antigerme poli]$ g++ test.cpp
> /tmp/ccwB8kUB.o(.text+0x18): In function `main':
> : undefined reference to `B::B[in-charge]()'
> /tmp/ccwB8kUB.o(.text+0x2d): In function `main':
> : undefined reference to `B::~B [in-charge]()'
> collect2: ld returned 1 exit status
> [andre at antigerme poli]$
> 
> Basically I am trying you work with polimorf in the GCC.
> 
> The simple program is:
> 
> class A {
>      public:
>              A();
>              ~A();
> };
> 
> class B: public A {
>      public:
>              B();
>              ~B();
> };
> 
> int main(void) {
>       A *a;
>       B b;
>       a = new B();
> }

You only declared constructors and destructors for the classes, but did 
not define them. You could write A() {}; ~A() {}; instead to define 
empty constructor and destructor.

HTH,
Pavel.





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