New cpp0 warning in 3.1 breaks configure (autoconf)

[Phil Edwards]

On Sat, Jun 08, 2002 at 12:44:07AM +0200, H}kan Hjort wrote:
> And reports in that thread of extra failurs in the testsuite from this
> change.

Yep.

> Further evidens of problems with these warnings can be found here
> http://gcc.gnu.org/ml/gcc-bugs/2002-04/msg00149.html
> 
> Where can the forbidden directories be found?  
> (Guessing based on gcc -v -E ..., /usr/local/include /usr/include)

Pretty much.  Any of the "standard system" directories on a particular
platform, also (IIRC) any of the include directories under the --prefix
directory.  Which means you must be careful installing symlinks to the
compiler.

> Is there anyway to get rid of this warning?

Nope.

> Why is it on by default?

Nobody knows.

> How are one supposed to workaround this in configure scripts?

You can't.  I changed my local copy of the compiler sources to no longer
warn about it.


Phil

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