[mercury-users] Is -O0 actually necessary on MacOS X with gcc-4.0?

[Julien Fischer]

On Sun, 19 Aug 2007, Michael Day wrote:

>> It would be good if it would be possible to isolate exactly which gcc 
>> option or optimisation is incompatible with Mercury, and then just disable 
>> that. Does anyone know why the -O0 is required?
>
> I built the compiler in reg.gc with -O0, but when I recompiled the compiler 
> in hlc.gc I forgot to add the -O0 to the Mmake.params. However, it seemed to 
> build fine, and programs built with it seem to work. Is the -O0 actually 
> necessary with gcc-4.0?

For low-level C grades**, yes.  For the hlc grades, (most probably) no.

Julien.

** Actually only those low-level grades that use gcc global register 
variables.


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