[ET Trac] [Einstein Toolkit] #849: Drop explicit support for Fortran 77 in Cactus

[Einstein Toolkit]

#849: Drop explicit support for Fortran 77 in Cactus
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 Reporter:  eschnett     |       Owner:     
     Type:  enhancement  |      Status:  new
 Priority:  minor        |   Milestone:     
Component:  Cactus       |     Version:     
 Keywords:               |  
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 I suggest to drop explicit support for Fortran 77 in Cactus. Fortran 77
 is, for all practical purposes, a subset of Fortran 90, and thus Fortran
 77 code can be compiled by Fortran 90 compilers.

 There is currently no platform that has a Fortran 77 and no Fortran 90
 compiler, and there is no Fortran source code in Cactus that cannot be
 compiled by a Fortran 90 compiler.

 In a way, supporting Fortran 77 as language is similar to supporting K&R C
 as a language. We don't do this either.

 I suggest to remove/ignore all configuration options regarding Fortran 77,
 and to compile .f77 and .F77 files with a Fortran 90 compiler. This change
 will simplify the configuration stage of Cactus. I don't expect any user
 to notice.

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/849>
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