Linker strips too much

Michael Greminger -- michael.greminger@dial.eunet.ch
Wednesday, July 03, 1996

Environment VC4.1, NT4.0 beta2

I have a serious problem.

I created two macros in my project:

#define DECLARE_HI \
        virtual CString GetName(); \
        virtual long GetID(); \

#define IMPLEMENT_HI(class_name, id, name, long_name) \
        CHI* class_name##Creator(short side) { return (new class_name(side)); } \
        static CHIDesc foo(id, name, long_name, class_name##Creator); \
        CString class_name::GetName() { return  name;} \
        long class_name::GetID() { return  id; }

These two macros appear in the header and the implementation of class, for example

class CFoo : public CFoo2
{
public:
        DECLARE_SERIAL( CFoo )
        DECLARE_HI


and in the implementation file

IMPLEMENT_HI(CFoo , 17, "Foo", "Long foo")

As you can see in the IMPLEMENT_HI macro there is a "static CHIDesc
foo" where the constructor should be executed at start time. All works
fine but when put these classes in a library the constructor is not
called !! I suppose that the linker sees no reference to this class so
it removes everything. When I add some explicit references to this
class anywhere in my code (for example CFoo* foo = new CFoo; delete
foo;) everythins works fine again.

Is there a solution for this problem, so that the constructor is also
called if the class is in a library.



Michael

---

Niels Ull Jacobsen -- nuj@kruger.dk
Wednesday, July 10, 1996

At 08:14 03-07-96 +0200, you wrote:
>Environment VC4.1, NT4.0 beta2
>
>I have a serious problem.
>
>I created two macros in my project:
>
>#define DECLARE_HI \
>        virtual CString GetName(); \
>        virtual long GetID(); \
>
>#define IMPLEMENT_HI(class_name, id, name, long_name) \
>        CHI* class_name##Creator(short side) { return (new
class_name(side)); } \
>        static CHIDesc foo(id, name, long_name, class_name##Creator); \
>        CString class_name::GetName() { return  name;} \
>        long class_name::GetID() { return  id; }
>
>These two macros appear in the header and the implementation of class, f=
or
example
>
>class CFoo : public CFoo2
>{
>public:
>        DECLARE_SERIAL( CFoo )
>        DECLARE_HI
>
>
>and in the implementation file
>
>IMPLEMENT_HI(CFoo , 17, "Foo", "Long foo")
>
>As you can see in the IMPLEMENT_HI macro there is a "static CHIDesc
>foo" where the constructor should be executed at start time. All works
>fine but when put these classes in a library the constructor is not
>called !! I suppose that the linker sees no reference to this class so
>it removes everything. When I add some explicit references to this
>class anywhere in my code (for example CFoo* foo =3D new CFoo; delete
>foo;) everythins works fine again.
>
>Is there a solution for this problem, so that the constructor is also
>called if the class is in a library.

A probable work-around would be to use the "Force Symbol References" in
the link settings (/INCLUDE:symbol). You would have to use the decorated=20
name of CHiDesc::CHiDesc, gotten from the map file.
   =20
>Michael
Niels Ull Jacobsen, Kr=FCger A/S (nuj@kruger.dk)
Everything stated herein is THE OFFICIAL POLICY of the entire Kruger=20
group and should be taken as legally binding in every respect.=20
Pigs will grow wings and fly.

---

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