Re: Bug in egcs-2.90.29 (Linux systems)

[Horst von Brand <vonbrand at sleipnir dot valparaiso dot cl>]

Cautaerts Vincent <vincent@comf5.comm.eng.osaka-u.ac.jp> said:
> Bug trigger by 
>   g++ -c Debug.cc -Wall -I . -I /home/vincent/include -O2
> Messages:
>  Debug.cc: In method `double VectorC::ChirpFWHM(const class VectorC &) const':
>  Debug.cc:24: warning: unused variable `int i2'
>  Debug.cc:23: warning: unused variable `int i1'
>  Debug.cc:26: Internal compiler error.
>  Debug.cc:26: Please submit a full bug report to `egcs-bugs@cygnus.com'.
> 
> [file Debug.cc provided here after]
> 
> Note: 
> 1. The program have been trimmed to the minimum necessary to show the
>    bug.

Thanks! But you should try to send preprocessed sources, since the bug
might be in (or triggered by) a #include:d file.


> 2. The bug does no apper if any of the following is done:
> 2.1. Run the preprocessor separately
>   gcc -E Debug.cc -O2 >Debug2.c; gcc -c Debug2.c -Wall

In that case no optimization is done (the last gcc call is the one really
doing the compiling).  Also, you are compiling the resulting file as C, not
C++. This is very weird, as your testcase definitely _isn't_ C. I get loads
of errors that way.

> 4. The bug does not happen on FreeBSD

Same compiler? Same libc et al?

BTW, here with linux-2.1.131ac13, egcs-19981213, glibc-2.0.108 it compiles
fine. It would seem that the bug is fixed in the latest snapshot. You might
try with egcs-1.1.1 (I understand the relevant RPMs are in the rawhide
distribution), at least here it compiles without complaints using
self-compiled egcs-1.1.1 C++ compiler.

Thanks for the report!
-- 
Horst von Brand                             vonbrand@sleipnir.valparaiso.cl
Casilla 9G, Viņa del Mar, Chile                               +56 32 672616