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Re: [PATCH] remove warning for --host without --build

From: Peter Rosin
Subject: Re: [PATCH] remove warning for --host without --build
Date: Mon, 23 Apr 2012 08:37:13 +0200
User-agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:11.0) Gecko/20120327 Thunderbird/11.0.1

On 2012-04-22 19:42, Bruno Haible wrote:
> Hi,
> On bi-arch systems (such as x86 / x86_64) it is often necessary to pass
> the --host option together with an appropriate value for CC. But this
> triggers a warning:
> $ ./configure --host=i686-pc-linux-gnu CC="gcc -m32 -march=i586"
> configure: WARNING: if you wanted to set the --build type, don't use --host.
>     If a cross compiler is detected then cross compile mode will be used
> ...

(CC on the configure line is not involved in triggering the warning)

> This warning was introduced on 2000-06-30, in commit
> <;a=commitdiff;h=cb2e761b8e1181f97e8e09d85526bd22078433db>
> with the remark "Re-enable the old behavior of --host and --build."
> This warning was meant to warn users about a changed semantics of
> --build and --host. This change is now 12 years in the past; users
> have had enough time to learn it. I therefore suggest to remove the
> warning.
> I've done lots of cross and bi-arch compilations in the last 10 years,
> all with --host and without --build, and have never observed a problem
> with it, except for the warning. Simply relying on config.guess is sufficient.

If you don't specify --build when you are cross-compiling (i.e. host != build),
in an environment where the build system -- for one reason or another -- is able
to execute the host code, the heuristic to detect a cross-compiler fails.

So, maybe also change the

        checking whether we are cross compiling... yes/no

outcome to a simple $host != $build (or something along those lines) so that

        ./configure --host=whatever

is made more similar to

        ./configure --host=whatever --build=the-default


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