inlining default

[David Edelsohn]

>>>>> Mark Mitchell writes:

>> It seems that Neil's 2001-11-15 changes to option parsing had a side
>> effect of turning on tree inlining at -O0 for C and C++ unless suppressed
>> with -fno-inline, because we now set flag_tree_inline from flag_no_inline
>> before setting flag_no_inline from optimize.  Is this what we want?  I
>> would prefer to leave it off by default with -O0, but many compilers turn
>> it on unless specifically disabled.  What do other people think?

Mark> I think we should leave it off at -O0.  I can't see a compelling
Mark> reason to change our historical practice.

	Without inlining a -O0, GCC fundamentally uses a different source
stream with and without optimization.  This makes debugging at -O0 more
difficult. 

David