Date: Mon, 19 Mar 2001 11:42:55 +0200 From: Maxim Sobolev <sobomax@FreeBSD.org> To: Alex Kapranoff <kapr@acm.org> Cc: ports@FreeBSD.ORG Subject: Re: Conditionalizing MACHINE_CPU checks Message-ID: <3AB5D49E.3DB82C00@FreeBSD.org> References: <20010319091353.A4146@kapran.bitmcnit.bryansk.su>
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Alex Kapranoff wrote:
> Good day to all.
>
> Do I really need to wrap MACHINE_CPU tests (like ${MACHINE_CPU:Mmmx})
> inside ${OSVERSION} >= 500018 tests?
>
> Or is it safe to assume that MACHINE_CPU:Mmmx will just fail on older
> systems and go with it?
>
> E.g. is it ok to do tests in this way:
>
> .if defined(WITH_MMX) || ${MACHINE_CPU:Mmmx}
> SRCS+= mmx.c
> .elif ${ARCH} == "i386"
> @${ECHO_MSG} "You can define WITH_MMX to use MMX instructions"
> .endif
No, because ${MACHINE_CPU:Mmmx}will be considered as an invalid conditional if
MACHINE_CPU is undefined.
-Maxim
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