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The upgrade to MacOS Ventura has broken my Fortran programming environment, mainly by moving the directories of the operating system around so that older versions of gfortran and gcc cannot find their proper libraries. Rather than spend hours recreating the original file structures and libraries from old backups and the Relocated Items folders, I decided to level up to the latest GNU C and Fortran compilers as maintained by MacPorts. These are gcc12 -- version 12 of the venerable GNU freeware package. The old Fortran programmers must have retired, because these new compilers have discarded several aspects of Fortran 66 syntax that I learned as a teenager. I don't write code with this older syntax, having transitioned to the Fortran 77 syntax of do/end do loops and if/then/else branches while in graduate school. Nevertheless, there is plenty of legacy code in my toolboxes, and some of these subroutines have do loops that end on an executable statement, and others contain nested loops that terminate on the same numbered statements. The new Fortran boffins outlawed these syntaxes, along with the arithmetic IF statement, in Fortran 2018. My legacy codes have plenty of arithmetic IF statements, so all of these had to be reprogrammed to comply with gcc12.
This post is the second of a handful of posts that will provide these upgraded codes. Here is the venerable EISPACK package of linear-algebra subroutines for inclusion within a Fortran program.
gfortran -c eispack_fort18.for
ar r eislib.a eispack.o
ranlib eislib.a
gfortran -o PROGRAM PROGRAM.f eislib.a
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