Include server not covering... about distcc HOT 6 CLOSED

Basically this message means that distcc's "pump" mode does not support the 
"-isysroot" flag, so distcc is falling back to using local preprocessing.  This 
is not new, so I guess something in your build environment recently changed 
which flags you are passing to distcc.

See
http://lists.samba.org/archive/distcc/2008q3/003790.html
for a work-around.

So from the workaround you pointed me at, essentially hiding that option from 
distcc is enough to make things work?  Couldn’t distcc be made to ignore the 
presence of that option and just pass it through?  Applying the workaround as 
described complicates my build system considerably.

Thanks!

Hi Dave,

> So from the workaround you pointed me at, essentially hiding that option from
> distcc is enough to make things work?

I don't know, but it's probably worth a try.  If you do try it, please let us 
know how it turns out.

> Couldn’t distcc be made to ignore the presence of that option and just pass
> it through? 

It would be awesome if you could make a patch for distcc to handle -isysroot.

It's not quite just a matter of passing it through; distcc notices that the 
compiler name is different and computes the set of built-in system directories 
separately for that compiler.  (The file include_server/compiler_defaults.py in 
the distcc sources keeps a table of built-in system directories, indexed by 
compiler name and -sysroot flag value.)

But you're right that it is probably not hard to do in distcc.
distcc already has code to handle -sysroot; handling -isysroot should be 
similar.

Documentation for -isysroot is hard to come by, but according to 
the documentation for -sysroot at 
<http://gcc.gnu.org/onlinedocs/gcc/Directory-Options.html>, which mentions 
-isysroot in passing,
"If you use both this option [-sysroot] and the -isysroot option, then the 
--sysroot option applies to libraries, but the -isysroot option applies to 
header files."

Since distcc's option processing is essentially only concerned with the effect 
on preprocessing, that means that for distcc, -isysroot should have exactly the 
same effect as -sysroot except that if -isysroot is present then distcc should 
use the -isysroot value and ignore the -sysroot value.

Distcc is open source.  If you are getting benefit from distcc, I would 
encourage you to improve it to make it even better and to contribute your 
changes back to the community.

Cheers,
  Fergus.

Actually it looks like Rafael Ávila de Espíndola has already made a patch for 
this.
I'll take on the task of fixing and integrating that patch.

Fixed in revision 783.

Thanks Fergus!  I would love to contribute, but my current circumstances make 
that very difficult.  These days I am forced to be a “taker” of FOSS 
without being able to give much back.  Your work is very much appreciated, 
though!