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Description of problem:

ocamlfind has a known bug in the version we ship on RHEL 7.3 where
it takes forever to link certain libraries.

This is fixed in the next upstream release in:

  https://gitlab.camlcity.org/gerd/lib-findlib/commit/d5838369130057d207a8140c426d0394989951f2

The release notes say:

   Fixed performance bug when many arguments need to be processed (Jérôme 
   Vouillon).

Version-Release number of selected component (if applicable):

ocaml-findlib-1.3.3-6.el7.x86_64

How reproducible:

100%

Steps to Reproduce:
1. Compile libguestfs >= 1.34 from source.

Actual results:

It will take an hour or so to compile in the mllib/ subdirectory.

Expected results:

It should run very quickly, in not more than a second.

*** Bug 1409309 has been marked as a duplicate of this bug. ***

I put fixed packages here for anyone else annoyed by this bug:

http://oirase.annexia.org/tmp/bz1403897/

Reproducer / verifier:

$ rm test.*
$ touch test.c
$ gcc -c test.c
$ ocamlfind mklib -o testlib test.o test.o test.o test.o test.o test.o test.o test.o test.o test.o test.o test.o test.o test.o test.o test.o test.o test.o test.o test.o test.o test.o test.o test.o test.o test.o test.o test.o test.o test.o test.o test.o test.o test.o test.o test.o test.o

If the bug exists, the final command will sit there for several minutes
using 100% CPU.

If the bug is fixed, the final command will run almost instantly.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2017:1926