Trouble cross compiling for powerpc

[Paul Bolle]

[Added David Howells.]

On Mon, 2015-02-02 at 09:29 +1100, Tony Breeds wrote:
> Sorry to get to the party late but I just grabbed:
> https://www.kernel.org/pub/tools/crosstool/files/bin/x86_64/4.8.0/x86_64-gcc-4.8.0-nolibc_powerpc64-linux.tar.xz
> 
> and built adma.o without issue.
> 
> I used 44x/katmai_defconfig with the following additions.
> +CONFIG_DMADEVICES=y
> +CONFIG_AMCC_PPC440SPE_ADMA=y

So I downgraded to cross-gcc-common-4.8.2-2.fc20 and
gcc-powerpc64-linux-gnu-4.8.2-2.fc20 (not sure if that version was ever
released but I downloaded it from Koji anyhow). Result is comparable to
the result I got with the current version of those packages:

make CROSS_COMPILE=powerpc64-linux-gnu- ARCH=powerpc drivers/dma/ppc4xx/adma.o
[...]
{standard input}: Assembler messages:
{standard input}:2122: Error: junk at end of line: `128'
{standard input}:2367: Error: junk at end of line: `128'
{standard input}:5136: Error: junk at end of line: `1'
{standard input}:5165: Error: junk at end of line: `1'
{standard input}:5174: Error: junk at end of line: `1'
make[1]: *** [drivers/dma/ppc4xx/adma.o] Error 1
make: *** [drivers/dma/ppc4xx/adma.o] Error 2

make CROSS_COMPILE=powerpc64-linux-gnu- ARCH=powerpc  CFLAGS_adma.o="-S" drivers/dma/ppc4xx/adma.o
  CHK     include/config/kernel.release
  CHK     include/generated/uapi/linux/version.h
  CHK     include/generated/utsrelease.h
  CALL    scripts/checksyscalls.sh
  CC      drivers/dma/ppc4xx/adma.o

sed -n -e "2122p; 2367p; 5136p; 5165p; 5174p" drivers/dma/ppc4xx/adma.o 
	mfcr 9,128
	mfcr 9,128
	mfcr 9,1
	mfcr 9,1
	mfcr 9,1

So this is apparently not some gcc regression. Now Fedora doesn't care
anymore about PPC32. On the other hand it does provide _kernel_ cross
builders for almost all current kernel architectures. So apparently
Fedora hopes to cover as many kernel builds as is possible. Did I get
that right?

So would it be worth David's (mostly) and my (a little) time to try to
get at least 32 bit PPC code to build? 


Paul Bolle