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Subject: [boost] Fw: Mysterious Boost.System-related errors when running Beast tests
From: Peter Dimov (lists_at_[hidden])
Date: 2018-05-05 12:10:23

The story starts with

which gives the error

dyld: Symbol not found: __ZN5boost6system6detail19system_category_ncxEv
  Referenced from:
  Expected in: /usr/local/lib/libboost_system.dylib

boost::system::detail::system_category_ncx is a new function (in develop),
and careful reading of the above reveals that the compiler is trying to link
to a preinstalled libboost_system.dylib, in /usr/local/lib.

Looking at the log, Boost.System is not even being built. This is odd; the
Beast root Jamfile contains



but even if it didn't, it also links to Filesystem, which _is_ being built,
and Filesystem also depends on System in its build/Jamfile:

So Boost.System should be built, but it isn't. Its Jamfile hasn't been
touched in 10 years:

In addition, there's not even a `mklink-or-dir boost/system` in the log,
even though the link must be created because the new headers are being used
(this could be a separate issue).

The Linux/g++ job,,
also doesn't seem to build Boost.System, but it works for some reason.

When I try `b2 libs/beast/test` on Windows, with msvc-14.1, Boost.System is
being built, in the very beginning:

...found 6992 targets...
...updating 1090 targets...
link.hardlink ..\..\boost\utility\string_view.hpp
Hardlink created for ..\..\boost\utility\string_view.hpp <<===>>

(The 1.66 version instead of 1.68 was caused by a typo in the superproject
which is now fixed.)

When I try the same on Ubuntu Trusty, the result is the same as on Travis;
no `mklink-or-dir boost/system`, no building of Boost.System, yet everything
compiles and works, and I don't have a preinstalled Boost on my VM.

It makes no sense at all.

Does anyone have any ideas what might be happening here?

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