Re: AC_GNU_SOURCE and cross compiling

[Bonzini]

> There is no target machine to consider here.  If you talk about a target
> machine then you are compiling a compiler that can generate code for a
> different machine than the host.  When compiling _with_ a cross-compiler
> then you have the build and the host machine, but all autoconf checks
> still apply to the host.

I think that Tobias meant "build" instead of "host" and "host" instead of 
"target", but
his diagnosis is not right anyway.

The host does have to define _GNU_SOURCE because it does have GNU functions -- 
it is
the test for getline that guesses wrong when cross-compiling; the solution is 
to say
that getline is available if GNU functions are available based on the outcome of
AC_GNU_SOURCE.

Paolo