[Boost-bugs] [Boost C++ Libraries] #13048: Static libraries and visibility hidden

Subject: [Boost-bugs] [Boost C++ Libraries] #13048: Static libraries and visibility hidden
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2017-05-26 18:21:46

#13048: Static libraries and visibility hidden
----------------------------+----------------------------------------------
 Reporter:  Mark M          |       Type:  Bugs
  <mememory359@…>           |
   Status:  new             |  Milestone:  To Be Determined
Component:  Building Boost  |    Version:  Boost Development Trunk
 Severity:  Problem         |   Keywords:  static library visibility hidden
----------------------------+----------------------------------------------
 I've been told that I can compile the Boost libraries with
 "-fvisibility=hidden".
 But I think it will work only for shared libraries, and I am building
 static libraries.

 If I'm wrong, please point out what I am missing.
 I will use the Filesystem library as an example, but I think this applies
 to Boost in general.

 There are a number of functions that need to have default visibility to
 allow the libraries to link with other code without error. These functions
 have the BOOST_FILESYSTEM_DECL macro in their declaration. I am using
 Xcode. The config/compiler/clang.hpp file has defined BOOST_SYMBOL_EXPORT
 with the attribute-visibility-default setting. So I look for code that
 sets BOOST_FILESYSTEM_DECL to be BOOST_SYMBOL_EXPORT.

 When I look at the filesystem/config.hpp file, BOOST_FILESYSTEM_DECL is
 blank, unless (BOOST_ALL_DYN_LINK or BOOST_FILESYSTEM_DYN_LINK) and
 BOOST_FILESYSTEM_SOURCE are set. But with static libraries, I don't want
 those settings, right?

 There is another preprocessor macro called BOOST_SYMBOL_VISIBLE, but it is
 only used one place in filesystem (for the filesystem_error class).

 Any help in the right direction would be appreciated.
 Or if this is an oversight, that would be helpful to know.

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/13048>
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