Factor out common warning in programs.m4

[Stepan Kasal]

Hello,
  I factored out common code from AC_*TOOL macros.

Then I changed
        test "$build" != "$host"
to
        test "$cross_compiling" = yes

as we are recommending this in the manual.

This induced some hacks in the testsuite.  (In cases where the tests
set cross_compilig=yes.)

I committed the resulting patch, as attached to this mail.

Have a nice day,
        Stepan

autoconf-20060317-cross-warn.patch
Description: Text document