[Bug 237515] textproc/htmldoc hangs at runtime when compiled with clang 8

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=237515

            Bug ID: 237515
           Summary: textproc/htmldoc hangs at runtime when compiled with
                    clang 8
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Keywords: regression
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: toolchain at FreeBSD.org
          Reporter: tobik at freebsd.org
                CC: jose at diasfernandes.pt
                CC: jose at diasfernandes.pt
             Flags: maintainer-feedback?(jose at diasfernandes.pt)

This might be an optimizer regression in clang 8 since it builds and runs fine
when compiled with clang 7.  Please see the upstream issue [1] and recent build
logs [2] for a tiny bit more details.

I don't know how to really debug this, so help would be appreciated.
I've applied a workaround for this in ports r499817, so to test use
a revision before that or directly build from the upstream repository.

[1] https://github.com/michaelrsweet/htmldoc/issues/349
[2]
http://beefy12.nyi.freebsd.org/data/head-amd64-default/p499421_s346424/logs/errors/htmldoc-1.9.3.log

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