[petsc-dev] CFLAGS and COPTFLAGS

[Jed Brown]

Barry Smith <bsmith at mcs.anl.gov> writes:
>    User runs
>
>      —with-cc=cc CFLAGS=“-m64” —with-debugging=0
>
>    gets the same performance as
>
>      —with-cc=cc CFLAGS=“-m64” —with-debugging=1
>
>     Can’t understand why.

It wouldn't have quite the _same_ performance because of PETSc debugging
overhead, but point taken.  OTOH, we may be squashing optimization flags
internal to the wrappers and some compilers have funny names for
optimization flags.
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