Building OS independant cross compilers (for ia64)

[Tom Bachmann <e_mc_h2 at web dot de>]

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[Please cc me, I'm not registered to the list.]
Hello,

I try to write a little toy kernel for ppc64 and ia64, mainly to get to
know the architectures. Actually this message is about 2 question, one
the one hand, they're tightly related, on the other hand they're
relatively different (therefore I wasn't sure whether to send 2 messages
or not).

The first question is about what target to build in my case.
Conceptually I want a completely OS-independant toolchain only
consisting of binutils and a C compiler, but which target expresses
this? <target>-unknown-unknown doesn't work (system not recognized). For
ppc64, the following configuration options seem to do what I want:
"--prefix=... --target=powerpc64-unknown-linux-gnu --enable-languages=c
- --disable-shared --disable-threads --without-headers --disable-libssp
- --disable-libmudflap".

But the ia64 cross toolchains thing seems to be even more tricky. For
what I know it depends on glibc (depending on kernel-headers?), but I
definitely don't want glibc. I don't think it is conceptually right to
depend on linux kernel headers or glibc headers if neither is used. So
what should one pass here? I tried some options
(--target=ia64-unknown-elf, --with-newlib) to workaround this, without
success (always problems compiling fde-glibc.c obviously related to
headers [stdlib.h, link.h] not found).

Thanks for any help.
- --
- -ness-
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