[jira] [Commented] (PROTON-1281) Odd link error when optimisation level is -O2 or -O3 when compiling with libc++ (clang C++ library)

["ASF subversion and git services (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/PROTON-1281?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15417505#comment-15417505 ] 

ASF subversion and git services commented on PROTON-1281:
---------------------------------------------------------

Commit 5afa455a5982eab0e5a4e6e6cf01fe12605870d9 in qpid-proton's branch refs/heads/master from [~astitcher]
[ https://git-wip-us.apache.org/repos/asf?p=qpid-proton.git;h=5afa455 ]

PROTON-1281: [C++ Binding] Missed #include <ostream>
- This was causing a difficult to find link error on FreeBSD/clang++

  The code in question was using ostream& << std::string("whatever");
  but only including <string> which only declares the operator<< used.

  However you need <ostream> to define the necessary template instantiation.
  If you don't include <ostream> then it becomes an unknown symbol.

  This only happens when compiling with -O2 or -O3. I think this is
  because these options inline the template instantiation in other
  places so that the symbol is not available in the library anymore.


> Odd link error when optimisation level is -O2 or -O3 when compiling with libc++ (clang C++ library)
> ---------------------------------------------------------------------------------------------------
>
>                 Key: PROTON-1281
>                 URL: https://issues.apache.org/jira/browse/PROTON-1281
>             Project: Qpid Proton
>          Issue Type: Bug
>          Components: cpp-binding
>    Affects Versions: 0.12.0
>         Environment: FreeBSD 10
>            Reporter: Andrew Stitcher
>            Assignee: Andrew Stitcher
>
> Building in the RelWithDebInfo or Release configurations on FreeBSD fails to build executables that use the C++ binding with a link error which is effectively this demangled symbol not found:
> std::ostream& operator<<(std::ostream&, std::string)
> [But it's much longer in real life because it's massively templated]



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