Re: Compiler Hosts and Targets

[dennison@telepath.com]

In article <75ffh3$cgk$1@nnrp1.dejanews.com>,
  dewarr@my-dejanews.com wrote:
> In article <75dr0b$h$1@nnrp1.dejanews.com>,
>   dennison@telepath.com wrote:
> > The gcc
> > we get is a prebuilt version for the 386 (not "Pentium",
> > 386). With this
> > system as shipped, you cannot build Pentium targetted
> > code.
>
> That is surely wrong, there is no such thing as gcc
> specifically targetted to the 386, you build a version of
> gcc for the x86, and then use the switches in the normal
> manner to control which target (386/486, 586=pentium,
> 686=pentium-pro) you want.
>
> Are you really saying that Wind River cripples this
> standard gcc feature? I doubt it!

No. But the system gets built from the Tornado GUI. There's no Pentium option
in Tornado. There's no mention in any of the VxWorks manuals about a "586"
option. When WindRiver came here to sell VxWorks to us, we asked them about
Pentium code generation, and they said they couldn't do it yet, and didn't
have a BSP for it (but of course the 486 one would work). There may a way to
turn on any Pentium II optimizations their version of gcc may have by hand
modifying their makefiles. But that implies spending the engieering effort
required to reverse engineer their whole build process, and debug the
results. Frankly just figuring out how to get our hardware working has taken
too much of our engineering effort. I have already mentioned in another post
one of the problems we encountered due to the BSP being 486 targetted.

So some parts of the system (like gcc) may have explicit support for the
Pentium (as opposed to the 486). But VxWorks/Tornado itself does not. A 486
targetted system may work on a Pentium II, but that's not the same thing as
having a Pentuim II targetted system.

--
T.E.D.

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