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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
..
This warning was introduced on 2000-06-30, in commit
<http://git.savannah.gnu.org/gitweb/?p=autoconf.git;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.
* lib/autoconf/general.m4 (_AC_INIT_PARSE_ARGS): Don't warn if --host
given without --build.
Signed-off-by: Eric Blake <eblake@redhat.com>
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