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From: Peter Grehan <grehan@freebsd.org>
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cc: freebsd-ppc@freebsd.org
Subject: Re: cross compile?
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> I have a FreeBSD 5.1 machine here anyway. Knocking up a PPC version
> on it for my Pegasos would be a sweet deal.

  You're all set - FreeBSD already cross-compiles:

cd /usr/src
make -DNO_WERROR TARGET_ARCH=powerpc buildworld
make -DNO_WERROR TARGET_ARCH=powerpc buildkernel

  I've made two changes that might be required:

RCS file: /usr/home/ncvs/src/lib/libc/powerpc/_fpmath.h,v
diff -u -r1.2 _fpmath.h
--- _fpmath.h   5 Apr 2003 22:10:13 -0000       1.2
+++ _fpmath.h   18 Nov 2003 02:41:36 -0000
@@ -29,14 +29,13 @@
  union IEEEl2bits {
         long double     e;
         struct {
-               unsigned int    sign    :1;
-               unsigned int    exp     :15;
-               unsigned long   manh    :48;
-               unsigned long   manl    :64;
+               unsigned int            sign    :1;
+               unsigned int            exp     :15;
+               unsigned long long      manh    :48;
+               unsigned long long      manl    :64;
         } bits;
  };

-/* XXX does powerpc have a normalization bit? */
  #define        mask_nbit_l(u)  ((void)0)
  #define        LDBL_IMPLICIT_NBIT

RCS file: /usr/home/ncvs/src/sys/conf/kern.mk,v
retrieving revision 1.37
diff -u -r1.37 kern.mk
--- kern.mk     4 Nov 2003 23:29:17 -0000       1.37
+++ kern.mk     18 Nov 2003 03:42:58 -0000
@@ -68,6 +68,14 @@
  .endif

  #
+# For powerpc disable kernel floating point
+#
+.if ${MACHINE_ARCH} == "powerpc"
+CFLAGS+=       -msoft-float
+INLINE_LIMIT?= 15000
+.endif
+
+#
  # GCC 3.0 and above like to do certain optimizations based on the
  # assumption that the program is linked against libc.  Stop this.
  #