[Bug 249351] [patch] cad/calculix-ccx: Re-enable multithreading with spooles (lost after 2.17 update)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=249351

            Bug ID: 249351
           Summary: [patch] cad/calculix-ccx: Re-enable multithreading
                    with spooles (lost after 2.17 update)
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: pfg at FreeBSD.org
          Reporter: rsmith at xs4all.nl
             Flags: maintainer-feedback?(pfg at FreeBSD.org)
          Assignee: pfg at FreeBSD.org

Created attachment 217982
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=217982&action=edit
Patch to re-enable USE_MT.

With the 2.17 update the fix for using multithreaded spooles (see bug #242995)
was lost. The enclosed patch re-enables it.

Note that without this patch ccx *reports* that it is using multiple cores, but
if you look at the actual CPU usage, it isn't.

Also, I've slightly changed the pkg-message; Using the environment variable
OMP_NUM_THREADS makes CalculiX use threads wherever it can. Otherwise you might
have to set *several* environment variables, like CCX_NPROC_STIFFNESS,
CCX_NPROC_EQUATION_SOLVER, CCX_NPROC_RESULTS et cetera. See "How to perform
CalculiX calculations in parallel" in "CalculiX CrunchiX USER'S MANUAL version
2.17".

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