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Re: Cross compiler questions
Tom Hawkins wrote:
Hi,
I'm attempting to build a GCC cross compiler to target embedded
powerpc targets with no OS. I have a couple questions. Sorry if
these have been answered before.
Build --target=powerpc-eabi.
First, why does GCC needed to be built twice -- once before, and once
after building the standard library -- even if GCC is already
installed on the host platform?
This is to insure that target system characteristics specified in
the library's header files are used to build the final gcc.
And second, is it possible to build a GCC cross compiler without a
standard library? My applications are very low level. Basically my C
code just reads and writes hardware registers; it has no use for
anything in stdlib.h, stdio.h, math.h, etc. I'm having a hard time
finding the magic combinations of binutils, gcc, and newlib that can
build without errors. I may have better luck if I can remove newlib
and the second GCC build from the equation.
You'll probably find it easier to use an established build model
rather than try to create your own. Build binutils, gcc, and newlib
for --target=powerpc-eabi. If you never use any of the functionality
in the library, then there's really no cost.
You will need to create *crt* files which set up the C runtime
environment for your target if one of the variants in GCC or
Newlib/libgloss is not suitable.
--
Michael Eager eager@eagercon.com
1960 Park Blvd., Palo Alto, CA 94306 650-325-8077