[Octave-bug-tracker] [bug #44818] clang: error: implicit instantiation of undefined template

[Mike Miller]

URL:
  <http://savannah.gnu.org/bugs/?44818>

                 Summary: clang: error: implicit instantiation of undefined
template
                 Project: GNU Octave
            Submitted by: mtmiller
            Submitted on: Sun 12 Apr 2015 10:37:15 AM EDT
                Category: Libraries
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Build Failure
                  Status: Patch Submitted
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: dev
        Operating System: Any

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Details:

Building with clang 3.6 catches the following C++ errors (selected subset):


../../libinterp/corefcn/c-file-ptr-stream.h:31:25: error: implicit
instantiation of undefined template 'std::__1::basic_streambuf<char,
std::__1::char_traits<char> >'
../../libinterp/corefcn/c-file-ptr-stream.h:38:16: error: implicit
instantiation of undefined template 'std::__1::basic_streambuf<char,
std::__1::char_traits<char> >'
…
../../libinterp/corefcn/procstream.h:73:22: error: implicit instantiation of
undefined template 'std::__1::basic_istream<char, std::__1::char_traits<char>
>'
../../libinterp/corefcn/procstream.h:78:29: error: type 'std::istream' (aka
'basic_istream<char>') is not a direct or virtual base of 'iprocstream'
…
../../libinterp/corefcn/procstream.h:103:22: error: implicit instantiation of
undefined template 'std::__1::basic_ostream<char, std::__1::char_traits<char>
>'
../../libinterp/corefcn/procstream.h:108:29: error: type 'std::ostream' (aka
'basic_ostream<char>') is not a direct or virtual base of 'oprocstream'
…
../../libinterp/corefcn/procstream.h:133:21: error: implicit instantiation of
undefined template 'std::__1::basic_iostream<char, std::__1::char_traits<char>
>'
../../libinterp/corefcn/procstream.h:138:28: error: type 'std::iostream' (aka
'basic_iostream<char>') is not a direct or virtual base of 'procstream'


The problem being that only the "iosfwd" header is included before the
definition of classes deriving from std::streambuf, std::istream, etc. For
some reason I haven't figured out yet, gcc is ok with this but clang 3.6 is
not. Replacing "iosfwd" with the full headers needed for all base class
definitions works for me. Any reason these header changes would cause
problems?

See attached diff.

Also this is not critical for the 4.0 release.



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File Attachments:


-------------------------------------------------------
Date: Sun 12 Apr 2015 10:37:15 AM EDT  Name: streams.diff  Size: 734B   By:
mtmiller

<http://savannah.gnu.org/bugs/download.php?file_id=33645>

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