[Boost-bugs] [Boost C++ Libraries] #12805: Build time config is not consistent with compile time config macros.

Subject: [Boost-bugs] [Boost C++ Libraries] #12805: Build time config is not consistent with compile time config macros.
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2017-02-02 16:08:18

#12805: Build time config is not consistent with compile time config macros.
-------------------------------------+-------------------------
 Reporter:  takahashi                |      Owner:  johnmaddock
     Type:  Support Requests         |     Status:  new
Milestone:  To Be Determined         |  Component:  config
  Version:  Boost Development Trunk  |   Severity:  Problem
 Keywords:                           |
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 Some permissive compilers allow to use some of c++11 (or 14/1z/...)
 features as a extension: e.g. clang allows using of rvalue references in
 gnu++98 mode.
 In that case, build time config (i.e. cxx11_rvalue_references) tells `yes`
 but `boost/config.hpp` defines `BOOST_NO_CXX11_RVALUE_REFERENCES` and
 `<utility>` doesn't define `std::move`, `std::forward`, and so on.
 Thus, the regression tests that depending on macros will be issued and
 failure.

 This is not only cland and rv-ref combination but also any other compiler
 and feature combinations: gcc allows lambda in gnu++98 mode but clang
 doesn't.

 IMO, the build time config should be compliant compile time config than
 compiler error.
 Any thoughts?

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/12805>
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