first iceadtea cross-compile patch: disable sanity checks

[Robert Schuster]

Hi Matthew,

Matthew Flaschen schrieb:
> I definitely think it should be optional, as you suggest in a comment.
> Otherwise, you're making things more difficult for someone building the
> code for the first time (or building on a new system).
Done.

Please let me know if it is OK that way.

There is one thing I would like to have but I don't know how to do it.
Autoconf already checks whether one is cross-compiling:

configure:3182: checking whether we are cross compiling
configure:3184: result: yes

In which variable is this result stored and when can I retrieve the
value for sure?

I want to implement the following algorithm in configure.ac:

if (cross-compiling)
  disable sanity checks by default
else if (--disable-sanity-checks was given)
  disable sanity checks
else
  do sanity check

I only have the last part so far but the proposed automatism would be
useful, since some of the sanity checks really can't be done when
cross-compiling. Well, except if your host can run the target's binaries.

Regards
Robert

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