Michael Eager - Re: Updating top-level autoconf to 2.59 (original) (raw)

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Erik Christiansen wrote:

If neither --host nor --target are specified, we're building native.

OK

If both --target and --host default to native, then specifying one or
both creates a single or double cross.

OK

But autoconf doesn't seem to distinguish between --host or --build being specified explicitly and when it guesses what they should be.

--build seems to be a synonym for --host, so its only useful purpose that I've imagined so far is to specify a native build if configure fails to detect that to the user's satisfaction. (And that could be done with --host, if that did not spuriously trigger a cross.)

I've built compilers for Cywin on Linux: --host=i686-cygwin --build=i686-linux-gnu --target=powerpc. I might also build --host=i686-Solaris on --build=i686-linux-gnu

(If there's a need to build a native compiler as if it were a cross, then --host and --target would only need to be specified as native.)

More guessing than that wouldn't help this cross compiler builder. (On PowerPc, AVR, and V850, the required fudges haven't been too bad so far, IIRC. But then I'm a few tool releases behind.)

Unfortunately, it seems that every time I update or upgrade my system, it installs newer versions of autoconf and automake. I don't notice that this has broken things until I try to make a configuration change. Then I'm off down a rat hole trying to debug autoconf once more.

-- Michael Eager eager@eagercon.com 1960 Park Blvd., Palo Alto, CA 94306 650-325-8077

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