That's a good point.  Not all compilers use -O3 (for instance, that
option would cause an error on Sun Studio.)  So I guess it isn't really
a good idea to modify the CFLAGS/CXXFLAGS in that manner.  I will look
into changing the default for post 1.0.0.  I also need to quantify
exactly how much boost I get from -O3 at the aggregate level.


Adam Tkac wrote:
>> No, that just adds to the CFLAGS/CXXFLAGS defined implicitly by
>> autoconf.  Thus, I end up with 'cc -O2 -O3'.
>>
>> What I want is a way to change the implicit -O2 C flag based on whether
>> or not a particular build condition is true.
>>
>>     
>
> When you add "-Ox" flag to the end of current C*FLAGS the last option
> is effective. It is true for GCC but I think other compilers have same
> behavior.
>
> Adam
>
>   


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