gcc4.7.2: try/finally, CLOBBER

[Vini Kanvar]

Hi,

gcc-4.7.2 adds exception handling constructs (try/finally block) for
pointer and array variables. These variables are CLOBBERed in the
finally block.

What is the meaning and use of CLOBBER? In which cases is it required?
What will happen if gcc does not CLOBBER these variables (e.g.
gcc-4.6.2 does not add try/finally and CLOBBER in the gimple code. How
does gcc-4.6.2 deal with such variables?).

Thanks and regards,

Vini Kanvar.