#7653: Ensure that C++ libraries linked are ISO standard with commerical
compilers
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Reporter: drkirkby | Owner: GeorgSWeber
Type: defect | Status: new
Priority: major | Milestone:
Component: build | Keywords:
Work_issues: | Author:
Upstream: N/A | Reviewer:
Merged: |
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Several C++ compilers from commercial vendors (Sun and HP being two
examples I am aware of), created C++ libraries based on an older version
of the C++ standard. This is incompatible with the current standard, so
both HP and Sun ship two libraries - one for backward compatibility, the
other which implements the last ISO standard, but at the expense of
backward compatibility.
In contrast, g++ only uses on library.
Sun take their usual attitude of ensuring Solaris is backward compatible,
so by default their C++ compiler uses a library which does not conform to
the latest C++ standard. Alexander Dreyer has found that the magic switch
to get Sun Studio to use the latest C++ library is
{{{
-library=stlport4
}}}
Further details can be found on the Sun web site at
http://developers.sun.com/solaris/articles/cmp_stlport_libCstd.html
Looking at the HP C++ compiler for HP-UX, I see that it too has two C++
libraries - one for backward compatibility, one for latest C++
conformance.
http://docs.hp.com/en/14487/faq.htm
Like the Sun compiler, the HP compiler defaults to an older C++ library
standard. The option to enable the latest standard is
{{{
-AA
}}}
In both cases, the same library must be used for all objects - you can't
mix them.
Hence at some point, all code in Sage that uses C++ must have the
appropriate option to C++ compiler to use the latest libraries, if it is
to be built with Sun Studio or any other compiler which ships with two
libraries.
I would invisage creating individual trac tickets for each package which
uses C++. The sensible option it to add this flag to a CXXFLAGS and hope
all packages respect CXXFLAGS. In practice, this will not happen, so many
will require changes to ensure they do respect flags from a global CXX
flags.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/7653>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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