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March 16, 2005
Using NASM and DMD with OptLink
Im writing a d version of a basic c kernel I found a tutorial on. I am having
trouble getting the assmebly code to link to the D code using OptLink.

Is there a good way to do this that i don't know of? MASM diddn't seem to work
like I hoped.

I am trying to use NASMW and i am telling it to output to obj format. All other
formats are "Unrecognized" by OptLink. I get this error when linking my D code
with my ASM code.

link /TINY Objects\Startup.o Objects\Core.obj, Core.bin
OPTLINK (R) for Win32  Release 7.50B1
Copyright (C) Digital Mars 1989 - 2001  All Rights Reserved

Objects\Startup.o(Startup)
Error 42: Symbol Undefined _core_main
OPTLINK : Warning 134: No Start Address
Objects\Startup.o(Startup)
Warning 47: Below 100H Cannot Be Initialized
OPTLINK : Error 46: Start Address Must Be 100H


My d code Does indeed have the core_main function defined.

Thanks in advance
- Trevor
March 16, 2005
Re: Using NASM and DMD with OptLink
In article <d19979$11a2$1@digitaldaemon.com>, Trevor says...
>
>Im writing a d version of a basic c kernel I found a tutorial on. I am having
>trouble getting the assmebly code to link to the D code using OptLink.
>
>Is there a good way to do this that i don't know of? MASM diddn't seem to work
>like I hoped.
>
>I am trying to use NASMW and i am telling it to output to obj format. All other
>formats are "Unrecognized" by OptLink. I get this error when linking my D code
>with my ASM code.
>
>link /TINY Objects\Startup.o Objects\Core.obj, Core.bin
>OPTLINK (R) for Win32  Release 7.50B1
>Copyright (C) Digital Mars 1989 - 2001  All Rights Reserved
>
>Objects\Startup.o(Startup)
>Error 42: Symbol Undefined _core_main
>OPTLINK : Warning 134: No Start Address
>Objects\Startup.o(Startup)
>Warning 47: Below 100H Cannot Be Initialized
>OPTLINK : Error 46: Start Address Must Be 100H
>
>
>My d code Does indeed have the core_main function defined.
>
>Thanks in advance
>- Trevor

Most likely you need to declare it as extern(C).

_______________________
Carlos Santander Bernal
March 16, 2005
Re: Using NASM and DMD with OptLink
Lets say I am stupid. Where do i put the extern (c) code.. Cause I tried it
before the core_main function and it gave me errors.

my code:

extern(c) int core_main()
{
ClearScreen();
Write("Welcome to my Kernel");
return(0);
}

my errors:

Source\Core.d(48): valid linkage identifiers are D, C, C++, Pascal, Windows
Source\Core.d(48): Declaration expected, not ')'

Source\Core.d(51): found 'Welcome to My Kernel
' when expecting ')'
Source\Core.d(51): no identifier for declarator
Source\Core.d(51): no identifier for declarator
Source\Core.d(51): semicolon expected, not '0'
Source\Core.d(51): Declaration expected, not '0'

Source\Core.d(52): Declaration expected, not 'return'

Source\Core.d(53): unrecognized declaration

Anyhoo... I hope this can be fixed easily.

Thanks in advance,
Trevor
March 16, 2005
Re: Using NASM and DMD with OptLink
Trevor wrote:
> Lets say I am stupid. Where do i put the extern (c) code.. Cause I tried it
> before the core_main function and it gave me errors.
> 
> my code:
> 
> extern(c) int core_main()
> {
> ClearScreen();
> Write("Welcome to my Kernel");
> return(0);
> }
> 
> my errors:
> 
> Source\Core.d(48): valid linkage identifiers are D, C, C++, Pascal, Windows
> Source\Core.d(48): Declaration expected, not ')'
> 
> Source\Core.d(51): found 'Welcome to My Kernel
> ' when expecting ')'
> Source\Core.d(51): no identifier for declarator
> Source\Core.d(51): no identifier for declarator
> Source\Core.d(51): semicolon expected, not '0'
> Source\Core.d(51): Declaration expected, not '0'
> 
> Source\Core.d(52): Declaration expected, not 'return'
> 
> Source\Core.d(53): unrecognized declaration
> 
> Anyhoo... I hope this can be fixed easily.
> 
> Thanks in advance,
> Trevor



Use a big 'C' in extern(C).  You used a little 'c'.
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