Building a cross compiler, and unsure about the use of --without-headers

[Kai Ruottu]

17.3.2011 12:58, David Paterson kirjoitti:

> I'm currently rebuilding using the methods you recommended, and so far
> it's working fine... :-)

It seems that preinstalling the target headers into the
'$prefix/$target/include' and putting them to be seen
also in '$prefix/$target/sys-include' (the GCC build
expects to see them there for investigation) is always
obligatory!  If putting only the 'newlib' and 'libgloss'
among the GCC sources, the C library will be built but
for instance the GCC's own 'limits.h' will not be fixed
to include the newlib's 'limits.h'.

Don't ask me why the GCC build expects the target headers
in '$prefix/$target/sys-include' and not in the assumed
'$prefix/$target/include' for where the newlib install
will put the final headers... I have never got any answer
to this insanity. The '--with-headers=' will copy the
pointed headers into the '$prefix/$target/sys-include'
and if one uses this to copy the generic newlib headers
there, the result will be totally wrong :(  When using
the compiler the '$prefix/$target/sys-include' will be
searched before the '$prefix/$target/include' for headers
and the possibly changed target-specific newlib headers
will never be found! So I suggest manual copying with
'cp -r' and a symlink... Or knowing that what the
'--with-headers=' copied, must be removed after the GCC
installation!