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Re: Change -mcpu option for VR41xx

To: Yoichi Yuasa <>
Subject: Re: Change -mcpu option for VR41xx
From: "Maciej W. Rozycki" <>
Date: Tue, 25 Feb 2003 14:18:38 +0100 (MET)
Cc: Ralf Baechle <>,
In-reply-to: <>
Organization: Technical University of Gdansk
Original-recipient: rfc822;
On Tue, 25 Feb 2003, Yoichi Yuasa wrote:

> binutils -mcpu option for VR4100 series
> 2.10:
>         * VR4100
>         * vr4100
>         * 4100
>         * mips64vr4100
>         * r4100
> 2.11:
> 2.12:
> 2.13:
>         * VR4100
>         * 4100
>         * mips64vr4100
>         * r4100

 They are case insensitive, which is why the redundancy was removed.

> In addition for the VR4100 series, there is an -m4100 option.

 Which is deprecated and scheduled for removal in the future.

> As for us, it is best to use the following option.
> GCCFLAGS        += -mcpu=r4100 -mips2 -Wa,-m4100,--trap
> Would you apply this patch to CVS?

 The trunk version of gas only supports "-m4100" and "vr4100" (but leading
letters are dropped if no exact match happens) for "-mcpu=" (which is also
deprecated), "-march=" and "-mtune=".  Additionally it supports "vr4111",
"vr4111", "vr4120", "vr4130" and "vr4181".  I suggest you go for: 

GCCFLAGS        += -mcpu=vr4100 -mips2 -Wa,--trap

for now as other options may trigger an error depending on the version of
tools used ("-mcpu=" is passed down to gas).

 I think we'll soon have to cook up a run-time gcc check for what is
accepted and use the "-march=" and "-mtune=" options preferably and
failing that, revert to legacy options like above.

+  Maciej W. Rozycki, Technical University of Gdansk, Poland   +
+        e-mail:, PGP key available        +

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