modbus team mailing list archive

[Alex Stapleton <alexs@xxxxxxxxxxxxx>]

On 12/07/2011 20:10, Stéphane Raimbault wrote:
> 2011/7/12 Alex Stapleton<alexs@xxxxxxxxxxxxx>:
> > It would seem that the RS485 code that's been put into libmodbus could use
> > some ifdefs for better platform compatibility.
>
> It's already the case (since one month) on github:
>
> #if defined(HAVE_DECL_TIOCSRS485)
> #include<sys/ioctl.h>
> #include<linux/serial.h>
> #endif
>
> Could test again with 3.0.0 release, please?

The problem with this is that sometimes HAVE_DECL_TIOCSRS485 is set
but TIOCSRS485 is not. For me this was because the emdebian armel headers
don't seem to line up properly.

Normally sys/ioctl.h indirectly includes
asm-generic/ioctls.h which has the actual defines in. On some cross-compile
headers asm-generic/ioctls.h must be included directly. This is an upstream
bug but it might be worth working around it in the libmodbus tree. Maybe 
throw
a #warning in if it's detected?