Date: Fri, 25 Feb 2005 08:28:30 +0200 From: Giorgos Keramidas <keramida@ceid.upatras.gr> To: Kathy Quinlan <kat-free@kaqelectronics.dyndns.org> Cc: freebsd-hackers@freebsd.org Subject: Re: gcc question Message-ID: <20050225062830.GD886@gothmog.gr> In-Reply-To: <421E9CD7.5060503@kaqelectronics.dyndns.org> References: <421D584A.90203@kaqelectronics.dyndns.org> <200502241532.50010.doconnor@gsoft.com.au> <421D81E9.809@kaqelectronics.dyndns.org> <200502251230.59147.doconnor@gsoft.com.au> <421E9CD7.5060503@kaqelectronics.dyndns.org>
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On 2005-02-25 11:34, Kathy Quinlan <kat-free@kaqelectronics.dyndns.org> wrote:
>Daniel O'Connor wrote:
>>On Thu, 24 Feb 2005 17:57, Kathy Quinlan wrote:
>>> ATM it is written in codevisionAVR which is where the function is
>>> called, so I guess for now I will just break the AVR support;)
>>
>> Ahh..
>> So.. are you talking about getting the coding running _in FreeBSD_ or
>> compiled on FreeBSD and running on an AVR?
>
> I am talking about getting the same code running under FreeBSD AND the
> AVR with minimal changes.
The easiest way is to hide the differences of the two platforms under a
properly designed abstraction layer. IIRC, it was putchar() that was
giving you trouble. Don't call it as putchar(), then. Write a wrapper
function, which gets properly defined either for either system. The
header that defines the wrapped functions' API can be common, i.e.:
#ifndef __WRAPPER_H
#define __WRAPPER_H
#ifdef __cplusplus
extern "C" {
#endif
int sendbyte(int val);
#ifdef __cplusplus
}
#endif
#endif /* __WRAPPER_H */
The implementation of the sendbyte() function may be in either a common
file sprinkled with #ifdef's for othe various platforms, or in separate
files that are conditionally added to the build depending on the current
platform.
I hope this helps,
Giorgos
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