[Wien] gfortran compilation and run problems for 19.1

[Gavin Abo]

The == should work for C/C++ language.  I don't recall ever seeing that 
being used for Fortran.

A quote from a HP Doctor Fortran article [ 
https://software.intel.com/en-us/forums/intel-visual-fortran-compiler-for-windows/topic/274462 
]:

"The real trouble with making assumptions about the internal value of 
LOGICALs is when you try testing them for "equality" against another 
logical expression. The way many Fortran programmers would naturally do 
this is as follows:

IF (LOGVAL1 .EQ. LOGVAL2) ...

but the results of this can vary depending on the internal 
representation. The Fortran language defines two operators exclusively 
for use on logical values, .EQV. ("equivalent to") and .NEQV. ("not 
equivalent to"). So the above test would be properly written as:

IF (LOGVAL1 .EQV. LOGVAL2) ..."

On 6/25/2019 3:14 PM, Fecher, Gerhard wrote:
> Does == work ?
>
> Ciao
> Gerhard
>
> DEEP THOUGHT in D. Adams; Hitchhikers Guide to the Galaxy:
> "I think the problem, to be quite honest with you,
> is that you have never actually known what the question is."
>
> ====================================
> Dr. Gerhard H. Fecher
> Institut of Inorganic and Analytical Chemistry
> Johannes Gutenberg - University
> 55099 Mainz
> and
> Max Planck Institute for Chemical Physics of Solids
> 01187 Dresden
> ________________________________________
> Von: Wien [wien-bounces at zeus.theochem.tuwien.ac.at] im Auftrag von Sam Trickey [trickey at qtp.ufl.edu]
> Gesendet: Dienstag, 25. Juni 2019 15:13
> An: wien at zeus.theochem.tuwien.ac.at
> Betreff: Re: [Wien] gfortran compilation and run problems for 19.1
>
> See below
>
> On 6/25/19 5:47 AM, Peter Blaha wrote:
> Hi,
>
> I can confirm the fix for   inputpars.F.   Of course, according to fortran standards a logical if should have an .eqv. operator (although I never "understood" what that should be good for ...).
>
> Keeps computer scientists occupied introducing needless and annoying distinctions.
>
> peace, Sam
>
>
> --
> Samuel B. Trickey
> QTP, Depts. of Physics and Chemistry
> 2324 Physics Building
> Box 118435
> Univ. of Florida
> Gainesville, FL 32611-8435
> Vox: 352-392-6978 (direct)
> Vox: 352-392-1597 (receptionist)
> Fax: 352-392-8722
> http://www.qtp.ufl.edu/ofdft
> http://users.clas.ufl.edu/trickey
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