[petsc-dev] CFLAGS and COPTFLAGS

[Jed Brown]

As far as I know, this is not a widespread convention.  Lots of users
put in CFLAGS=-O3 and either don't notice that it doesn't get used or
are frustrated that it's not used.  Is the "auto" value of splitting out
COPTFLAGS worth this confusion?  Or can we make the behavior more
obvious?
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