Re: CPU vs architecture

[Stefan Schaeckeler <schaecsn%gmx.net@localhost>]

Hello,

> > I have a package that can use for certain CPUs different asm code.
> >
> > How do I check in the Makefile for pentium and above vs everything lower?
> 
> Why need such a check?
>   * Need to specify CPU architecture to build?

Yes.

It's perhaps easier to show the Makefile than to explain in English. It's 
package wip/bogomips. Relevant part of Makefile:

--- snip ---------------------------------------------------------------------
.if ${MACHINE_ARCH} == "i386" || ${MACHINE_ARCH} == "x86_64"
BUILD_TARGET=bogo586
.elif ${MACHINE_ARCH} == "alpha"
BUILD_TARGET=bogoAlpha
.elif ${MACHINE_ARCH} == "sparc64"
BUILD_TARGET=bogoSparc64
.elif ${MACHINE_ARCH} == "sparc"
BUILD_TARGET=bogoSparc
.elif ${MACHINE_ARCH} == "powerpc"
BUILD_TARGET=bogoPPC
.elif ${MACHINE_ARCH} == "hppa"
BUILD_TARGET=bogoPPC
.else
BUILD_TARGET=bogoport
.endif

do-install:
        ${INSTALL_PROGRAM} ${WRKSRC}/${BUILD_TARGET} 
${DESTDIR}${PREFIX}/bin/bogomips
--- snip ---------------------------------------------------------------------

Every CPU has an own Makefile target. For IA-32, there are two targets: bogo386 
and bogo586

The Readme file says "Use [bogo386] for anything that came before a Pentium." I 
get different results for both targets on my i686.


>   * Package auto detect CUP, result in different PLIST?

Don't understand.
 

> Anyway, it is nice to be selectable (with PKG_OPTIONS?).
> Maybe, someone want to build a fast machine, use the binary package with old 
> machines.

I see several ways to address this problem:

a) leave it as is. Not many ppl have 386 or 486 computers.

b) leave it as is. Not many ppl have 386 or 486 computers. Use PKG_OPTIONS to 
choose [34]86. Default is 586 and above.

c) compile and install both versions (/usr/pkg/bin/bogo386 and 
/usr/pkg/bin/bogo586). I don't know what to write in PLIST, then. For other 
architectures, I'll have a different program name (/usr/pkg/bin/bogomips).

Further ideas? What is the best way to solve this?

- Stefan

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