floating point operations in gcc 3.3.3, glibc 2.3.2

Daniel Kegel dank@kegel.com
Wed Jun 23 20:11:00 GMT 2004


Ollie Wild wrote:
>  We've found the problem.  Turns out our build script was to blame, not 
> the patches.  We were executing a loop like:
> 
>    for cpu in sh4 i686 powerpc-405 powerpc-750; do
>            cd $TOP_DIR
>                                                                                   
> 
>            # Load definitions for current CPU into environment and build
>            eval `cat $cpu.dat ../$TOOLCOMBO.dat` buildit
>    done
> 
> Interestingly, this behaves differently if executed with /bin/sh instead 
> of /bin/bash.  In the former case, any variables set by $cpu.dat are 
> preserved between iterations.  In the latter case, they are only valid 
> for a single execution of buildit.
> We were all executing the script with "sh ./doit.sh", which was causing 
> the ppc750 build to give weird floating point results *only* if it was 
> built after sh4 and powerpc-405.

Aha!  OK, that explains a lot.  Maybe I'll include a note in the
doc about this.

- Dan

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