[M3devel] random notes: gcc 4.5, sparc, etc.

[Tony Hosking]

On 6 Oct 2010, at 09:30, Jay K wrote:

> 
> some random notes
> 
> Solaris/sparc32 using gcc 4.3 backend, -O3 breaks exception handling
>   Easy test is to run cm3 without a neighboring cm3.cfg and the error
>   is that cm3.cfg didn't define BUILD_DIR, rather than couldn't find cm3.cfg

Used not to break.  I did test this at one point.

> Solaris/sparc32 using gcc 4.5, exception handling is broken, without optimization
>   Same easy test, but it crashes upon first attempt to raise an exception.
> 
> Solaris/sparc32 using gcc 4.3 is broken by the typeinfo and/or stabilize_reference + O3.
>   NULL derefence in backend. Unless you go down to -O2, which parse.c does now.
>   
> Linux/sparc32 using gcc 4.5 is very broken, I think without optimization.
>   Actually doesn't seem to crash but exit(0) before it finishes initializing all modules.
> 
> Meanwhile I think many other targets are working ok with 4.5.
> Hudson doesn't use -O2 or -O3 but I use them fairly often, at least on Darwin.
> 
>  - Jay
>