Hi,

I was creating a small OpenGL test program at the weekend and found that when linking in the the OpenGL libraries that sin and cos were missing.

The project was a standard console application, with no changes to the compiler or linker settings (other then setting up include directories) and adding the OpenGL libraries.

To fix the problem I had to do the following:

#ifdef __DMC__
#undef cos
#undef sin
extern "C" double cos(double a)
{
    return _inline_cos(a);
}

extern "C" double sin(double a)
{
    return _inline_sin(a);
}
#endif


This was on Windows 98 not using the OpenGL libraries supplied with the compiler (which may be the problem).

By the way the link phase works on NT with the OpenGL libraries supplied with the compiler.

I will do some further investigation and also give it a go with the new CD-ROM
when I have been able to order the CD-ROM (Takes awhile setting up an
international pay-pal account, so my order will not be able to
go in until the end of this week :< Looking foraward to a signed copy :>> ).

Regards
Damain

Damian,

Are you sure you're using the latest math,h?
Mine seems to be from 02/25/2001!

Jan



Damian Dixon wrote:

> Hi,
>
> I was creating a small OpenGL test program at the weekend and found that when linking in the the OpenGL libraries that sin and cos were missing.
>
> The project was a standard console application, with no changes to the compiler or linker settings (other then setting up include directories) and adding the OpenGL libraries.
>
> To fix the problem I had to do the following:
>
> #ifdef __DMC__
> #undef cos
> #undef sin
> extern "C" double cos(double a)
> {
>     return _inline_cos(a);
> }
>
> extern "C" double sin(double a)
> {
>     return _inline_sin(a);
> }
> #endif
>
> This was on Windows 98 not using the OpenGL libraries supplied with the compiler (which may be the problem).
>
> By the way the link phase works on NT with the OpenGL libraries supplied with the compiler.
>
> I will do some further investigation and also give it a go with the new CD-ROM
> when I have been able to order the CD-ROM (Takes awhile setting up an
> international pay-pal account, so my order will not be able to
> go in until the end of this week :< Looking foraward to a signed copy :>> ).
>
> Regards
> Damain

The compiler normally inlines sin() and cos(). To defeat that,  just #undef
them. What you did will work too. -Walter


Damian Dixon wrote in message <1103_992332827@dilbert>...
>Hi,
>
>I was creating a small OpenGL test program at the weekend and found that when linking in the the OpenGL libraries that sin and cos were missing.
>
>The project was a standard console application, with no changes to the compiler or linker settings (other then setting up include directories) and adding the OpenGL libraries.
>
>To fix the problem I had to do the following:
>
>#ifdef __DMC__
>#undef cos
>#undef sin
>extern "C" double cos(double a)
>{
>    return _inline_cos(a);
>}
>
>extern "C" double sin(double a)
>{
>    return _inline_sin(a);
>}
>#endif
>
>
>This was on Windows 98 not using the OpenGL libraries supplied with the compiler (which may be the problem).
>
>By the way the link phase works on NT with the OpenGL libraries supplied with the compiler.
>
>I will do some further investigation and also give it a go with the new
CD-ROM
>when I have been able to order the CD-ROM (Takes awhile setting up an
>international pay-pal account, so my order will not be able to
>go in until the end of this week :< Looking foraward to a signed copy
:>> ).
>
>Regards
>Damain
>