Hi Boost Users,
First, a great thanks to the authors of the boost serialisation
library, which I have used successfully across projects and has proven
invaluable. Now to my problem. I have been investigating for a little
while a strange warning I get when linking on OSX; the results of my
investigation can be found here [1].
The TL; DR of it is as follows: my OSX debug build has a warning
(indented for ease of reading):
ld: warning: direct access in function
'boost::archive::basic_text_oprimitive<
std::__1::basic_ostream<char, std::__1::char_traits<char> >
>::~basic_text_oprimitive()'
from file
'vcpkg_installed/x64-osx/debug/lib/libboost_serialization.a(basic_text_oprimitive.o)'
to global weak symbol
'std::__1::basic_ostream<char, std::__1::char_traits<char> >&
std::__1::endl<char, std::__1::char_traits<char> >
(std::__1::basic_ostream<char, std::__1::char_traits<char> >&)'
This warning is caused by a mismatch in visibility settings between my
project and vcpkg's build of boost. However, as far as I can see, both
projects are using "-fvisibility=default", meaning there should be no
mismatch. Also, no other warnings show up but if I change the project
settings I then get hundreds of warnings (again, for details see
ticket).
What I find even more puzzling is that I am using all three types of
archives (Text, XML and Binary). Of these three, only Text produces
this warning. As the problem is with the destructors, I did a quick
inventory of the destructors to see how they differ:
basic_xml_oarchive.hpp: [2]
BOOST_ARCHIVE_OR_WARCHIVE_DECL
~basic_xml_oarchive() BOOST_OVERRIDE;
basic_text_oarchive.hpp: [3]
~basic_text_oarchive() BOOST_OVERRIDE {}
basic_binary_oarchive.hpp: [4] no destructor.
So my question is, should text archive also have a
BOOST_ARCHIVE_OR_WARCHIVE_DECL macro, and would that fix my warning?
If so I can submit a PR.
Many thanks for your time.
Marco
[1] https://github.com/Microsoft/vcpkg/issues/4497
[2]
https://github.com/boostorg/serialization/blob/develop/include/boost/archive/basic_xml_oarchive.hpp
[3]
https://github.com/boostorg/serialization/blob/develop/include/boost/archive/basic_text_oarchive.hpp
[4]
https://github.com/boostorg/serialization/blob/develop/include/boost/archive/basic_binary_oarchive.hpp
--
Marco Craveiro
MD, Domain Driven Consulting
blog: https://mcraveiro.github.io/index.html
twitter: https://twitter.com/MarcoCraveiro
That the Ideas are themselves manifestations (of the Idea-Idea) and
that the Idea-Idea is a-kind-of Manifestation-Idea—which is a-kind-of
itself, so that the system is completely self-describing— would have
been appreciated by Plato as an extremely practical joke [Plato]. --
Alan Key
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