Greetings all,
After several obstacles, I think I successfully upgraded the toolchain
on 4.10-RELEASE. My Google searches along the way yielded tales of
several other attempts, but no documented successes.
Here's what I had to do:
* Fix bug in binutils-2.15 ./bfd/configure that lumps 4.10 in
with 4.[0-4] via a bad regexp, thus trying to compile
trad-core.c when it should not.
* Force binutils OUTPUT_FORMAT to "elf32-i386" to match stock
4.10-R, lest I must make world due to binutils' default
"elf32-i386-freebsd". AFAICT, I did this correctly, but
wouldn't yet bet large sums of money on it.
* Build binutils-2.15, /usr/lib/crt*.o, and gcc-3.3.5.
* Rebuild same using new binutils/gcc/crt.
* Rebuild another time or two for good measure.
* In /usr/share/mk/bsd.kern.mk, remove "-fformat-extensions"
and add "-ffreestanding -fno-builtin".
* Fix kernel source that gcc-3.3 hates. Some parts I know are
correct, but others (fortunately in modules I don't use) left
me a bit less confident.
I've compiled several userland programs and a GENERIC kernel, and soon
will try running a non-GENERIC kernel that's building with the new
toolchain as I type.
I used gcc-3.3.5 because kernel compilation attempts were an utter
failure on gcc-3.4.3:
-O1 (or was it "-O0"?) emitted "movb %sil,..."
-O3 crashed somewhere along the way
Both scare me greatly. I'm tempted to try rebuilding gcc-3.4.3 with the
new toolchain, but a bit reluctant to tear things up again just yet.
Hopefully someone finds all this useful. I presume I'm not the only one
who wants to try a newer toolchain on RELENG_4.
Eddy
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