Re: [gentoo-user] Difference between "normal distcc" and "distcc with pump"?

[Fernando Rodriguez <frodriguez.developer@outlook.com>]

On Monday, May 04, 2015 5:29:34 AM Fernando Rodriguez wrote:
> On Sunday, May 03, 2015 11:59:08 PM Walter Dnes wrote:
> > On Sun, May 03, 2015 at 02:57:46PM -0400, Fernando Rodriguez wrote
> > 
> > > Some packages do custom preprocessing and other weird things during
> > > the build process that cause problems with pump mode since it caches
> > > copies of the unmodified headers. If you're lucky it just fails (and
> > > usually falls back on compiling locally), if you're not then it may
> > > succeed and you'll get runtime bugs. I haven't find a package yet
> > > that fails without pump mode as long as your CFLAGS are set properly.
> > 
> >   Seamonkey fails during the build process.  Two tries, and the build
> > log was 74,046 bytes each time.  I have an Intel x86_64 as the host, and
> > an Atom i686 (32-bit only) as the client.  Given your description, I may
> > drop "pump" altogether from my "xmerge" script.  I'll unmerge
> > seamonkey-bin, and try distcc-building seamonkey from source, without
> > "pump", Monday when I have more time.  Here are a few lines from the
> > failed build log, using "pump"...
> > 
> > Executing: gcc -o nsinstall_real -march=atom -mtune=atom -fstack-protector 
-
> pipe -mno-avx -DXP_UNIX -MD -MP -MF .deps/nsinstall_real.pp -O2 -DUNICODE -
> D_UNICODE -Wl,-O1 -Wl,--as-needed host_nsinstall.o host_pathsub.o
> > 
> > /usr/lib/gcc/i686-pc-linux-gnu/4.8.4/../../../../i686-pc-linux-gnu/bin/ld: 
> i386:x86-64 architecture of input file `host_nsinstall.o' is incompatible 
with 
> i386 output
> > 
> > /usr/lib/gcc/i686-pc-linux-gnu/4.8.4/../../../../i686-pc-linux-gnu/bin/ld: 
> i386:x86-64 architecture of input file `host_pathsub.o' is incompatible with 
> i386 output
> > 
> > /usr/lib/gcc/i686-pc-linux-gnu/4.8.4/../../../../i686-pc-linux-gnu/bin/ld: 
> host_nsinstall.o: file class ELFCLASS64 incompatible with ELFCLASS32
> > 
> > /usr/lib/gcc/i686-pc-linux-gnu/4.8.4/../../../../i686-pc-linux-gnu/bin/ld: 
> final link failed: File in wrong format
> > 
> > 
> 
> The error on the link that you posted looks like cause by pump mode, this 
one 
> I'm not so sure.
> 
> It looks like you're not using the cross compiler on the host as it would 
not 
> generate 64 bit code. Did you add -m32 to your CFLAGS on the client box? 
Also 
> you may need to set the custom-cflags use flag. Can you verify that it is 
using 
> the cross compiler on the host?
> 
> I'm not sure exactly what the gentoo recommended distcc/cross compile setup 
> but if you do it like I suggested on your other thread (using the host 64bit 
> compiler) it should work. Look at the links you got under 
/usr/lib/distcc/bin. 
> All you need to do is create scripts on the host with the exact same names 
and 
> have them execute the compiler that you want with the options you want (I 
just 
> have it execute the 64bit compiler with -m32). Then make sure that distccd 
(on 
> host) finds them before the actual compiler by putting it in the PATH 
> environment variable before anything else. For that you may need to modify 
the 
> init script or unit file if using systemd or just start distccd manually.
> 
> A simpler hack is to just delete the c++, cc, gcc, and g++ symlinks from the 
> /usr/lib/distcc/bin directory. That will force distcc to only trap the 
> compiler invocations that use the full compiler name and end up using the 
> cross compiler in the host, but if you do this you may end up compiling more 
> stuff locally.

Or you just replace them (c++, cc, gcc, and g++) with a wrapper to make sure 
it invokes the full compiler name. That's what they recommend here: 
https://wiki.gentoo.org/wiki/Raspberry_Pi_Cross_building

-- 
Fernando Rodriguez