Cross compiling GRUB

[Klaus Reichl]

Hi GRUBies,

As our production is done on Solaris (this is no advertisment for
Sun), I integrated GRUB in our source tree and gave it a try with
cross-compiling.

A `config.site' file for autoconf packages was already available, and
it worked, HEUREKA.

The only problem I had was with --enable-preset-menu.  

The grub_DEFINE_FILE macro, which is a tool supposed to run on the
BUILD machine, used the cross-compiler (CC) and was apparently not
able to run and produce the expected PRESET_MENU file. 

To fix this we need autoconf expertise wrt. cross compiling (Okuji,
you or to whom can we talk to?).

>From aclocal.m4:

  AC_DEFUN(grub_DEFINE_FILE,
  [AC_REQUIRE([AC_PROG_CC])
  ...

Here we need something along the lines of 

>From glibc's configure.in:

  if test $host != $build; then
    AC_CHECK_PROGS(BUILD_CC, gcc cc)
  fi
  AC_SUBST(cross_compiling)

Any autoconf/cross-compiling specialists out there?  Otherwise I'll
start experimenting on it myself.

KR
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