Re: Some Cross Compiling Questions

On Wed, Jul 14, 1999 at 05:41:33PM +0200, Grant Carter wrote:

Hi all

I am very new at using the GNU tools and cross compilers etc and am
wanting to compile Linux for the RPXLite Board running a PowerPC 823. I
have gone throught the CrossGCC FAQ as well as a document on Cross
Development for Linux/PPC but I still have a few questions/problems
which I hope someone can help me with please.

I am running an i386-FreeBSD system and, as I said before, am wanting to
build a PowerPC-linux system. I have built binutils-2.9.1.0.25 and
egcs-1.1.2 successfully and have used that to build the LinuxPPC kernel
(2.2.5). Everything compiled fine but I want to know 2 things: I have
read about libgcc.o and was wondering if I had to provide my own one or
if gcc knew enough about the 823 to build its own. Secondly, how do I
get floating point emulation running as the 823 doesn't provide hardware
floating point. I saw a --nfp in the configuration options - should I
enable this?

You want -msoft-float.  Most likely when you build egcs it will build a
bunch of files in subdirectories named nof.  These are used when you
specify -msoft-float on the command line.

Next I tried to compile both glibc which failed. The error message was
as follows:

../sysdeps/powerpc/s_isnan.c: In function `__isnan':
../sysdeps/powerpc/s_isnan.c:32: fixed or forbidden register 32 (0) was
spilled for class FLOAT_REGS. This may be due to a compiler bug or to
impossible asm statements or clauses.

Is this related to my needing the correct libgcc.o file so that the
assembler knows how to implement these functions or what?

Bad version of gcc.  Try the latest 2.95 snapshots.

I also tried newlib 1.8.1 and newlib 1.7.1. They were complaining about
crt1.0 and crt1.s respectively. I believe that I need one of these files
built for my target platform. Can someone provide me with one or do I
have to write my own? If so, can someone please point me in the
direction of some documentation about the contents of these files? 

crt*.o come partly with glibc and partly with egcs; crt1.o is from
glibc.  I would expect newlib to have it.

Dan

/--------------------------------\  /--------------------------------\
|       Daniel Jacobowitz        |__|        SCS Class of 2002       |
|   Debian GNU/Linux Developer    __    Carnegie Mellon University   |
|         dan@debian.org         |  |       dmj+@andrew.cmu.edu      |
\--------------------------------/  \--------------------------------/

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