Re: [avr-gcc-list] PR46779: Arduino W5100.h does not compile correctly

[Georg-Johann Lay]

Please don't forget to CC the lists

Daved a écrit:
> http://gcc.gnu.org/PR46779 doesn't look like a duplicate to me. It is 
> talking about array access which is not the case  in my problem.

Forget about what users are babbling ;-) Just because there are array 
accesses in the source that exposed the PR, it's still not the *root 
cause* of the bug.

Many bug descriptons and "resonings" are confusing, and even more 
confusing after the root cause is clear.

> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51445 does indeed provide a 
> fix, a patch, or whatever you want to call it, to the w5100.h source.

The compiler dump shows that it's a bug in the compiler. Thus, any 
attempt to try to "fix" that in the application is *not* a fix. It hacks 
around the very problem, and in particular for a header the problem is 
likely to return. All depends on surrounding code and inlining and 
command line options. Moreover, other modules might be affected, too. 
Arduino or user's code or any other code.

The only correct fix is to use a corrected compiler version, recommended 
is 4.6.3 or later.  You also can backport the patch attached to PR46779 
to 4.5.

Johann