can't compile!

[Steve]

Hi,

I know this is not a compiler newsgroup but I really can't find an
answer to this anwhere and it's very very trivial (I'm sure).

I have a few files: file1.h, file1.cpp, file2.cpp

file1.h has a class with a few functions. Now when I try to compile and
then link the files, the linker says that it can't find a reference to a
function defined in file1.h!! Why!! I have two object files: file1.o and
file2.o. Why can't it find a reference from file1.o when the file is in
the same directory? Please help!

Steve

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[Jorge Rivera]

Re: can't compile!

Steve wrote:[color=blue]
> I have a few files: file1.h, file1.cpp, file2.cpp[/color]
Withouth being specific, it's hard to tell what's really going on.
[color=blue]
> file1.h has a class with a few functions. Now when I try to compile and
> then link the files, the linker says that it can't find a reference to a
> function defined in file1.h!! Why!! I have two object files: file1.o and
> file2.o. Why can't it find a reference from file1.o when the file is in
> the same directory? Please help!
>[/color]
Look at all the function signatures in file1.h, and make sure that every
function is defined in either file1.cpp or file2.cpp. What your
compiler is telling you is that neither file1.o nor file2.o have the
definition to a function defined in file1.h.

Jorge L.

[Steve]

Re: can't compile!



Jorge Rivera wrote:[color=blue]
> Steve wrote:
>[color=green]
>> I have a few files: file1.h, file1.cpp, file2.cpp[/color]
>
> Withouth being specific, it's hard to tell what's really going on.
>[color=green]
>> file1.h has a class with a few functions. Now when I try to compile
>> and then link the files, the linker says that it can't find a
>> reference to a function defined in file1.h!! Why!! I have two object
>> files: file1.o and file2.o. Why can't it find a reference from file1.o
>> when the file is in the same directory? Please help!
>>[/color]
> Look at all the function signatures in file1.h, and make sure that every
> function is defined in either file1.cpp or file2.cpp. What your
> compiler is telling you is that neither file1.o nor file2.o have the
> definition to a function defined in file1.h.
>
> Jorge L.[/color]

Thanks Jorge. I just discovered that adding 'inline' to a function that
is in a separate file becomes inaccessible to other files! Is that
normal? After I Removed 'inline' from all functions, everything started
to work fine.


Cheers,
Steve

[John Harrison]

Re: can't compile!

>[color=blue]
> Thanks Jorge. I just discovered that adding 'inline' to a function that
> is in a separate file becomes inaccessible to other files! Is that
> normal? After I Removed 'inline' from all functions, everything started
> to work fine.
>[/color]

Yes its normal. Put inline functions in header files, the compiler can't
inline a function unless it can see its definition at the point of use.
Putting inline functions in a header file is a simple way to make sure this
is so.

john

[Michiel Salters]

Re: can't compile!

Steve <nospam@nopes > wrote in message news:<40b15612$ 1@clarion.carno .net.au>...[color=blue]
> Hi,
>
> I know this is not a compiler newsgroup but I really can't find an
> answer to this anwhere and it's very very trivial (I'm sure).
>
> I have a few files: file1.h, file1.cpp, file2.cpp
>
> file1.h has a class with a few functions. Now when I try to compile and
> then link the files, the linker says that it can't find a reference to a
> function defined in file1.h!![/color]

Post code. We're not psychic.

Ok, a bit. Perhaps

// file1.h
class C
{
void foo();
};
// file1.cpp
void foo(); // new function, not void C::foo()

Regards,
Michiel Salters