[Wien] $DEC! NOOPTIMIZE equivalents in gfortran?

[Laurence Marks]

I am testing adding the compiler directive !DEC$ NOOPTIMIZE to the Kahan
summations in charge.f in order to prevent ifort from optimizing the
summation away. It seems to help.

Does anyone know if there are equivalents in gfortran or other compilers?
(I can't find anything for gfortran.)

N.B., if anyone has experience with directives and wants to suggest others
that may be faster but will avoid optimizing away the summation I am open
to suggestions.

-- 
Professor Laurence Marks
"Research is to see what everybody else has seen, and to think what nobody
else has thought", Albert Szent-Gyorgi
www.numis.northwestern.edu ; Corrosion in 4D: MURI4D.numis.northwestern.edu
Partner of the CFW 100% program for gender equity, www.cfw.org/100-percent
Co-Editor, Acta Cryst A
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