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(gcc-300.info)Deprecated Features

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Deprecated Features
===================

   In the past, the GNU C++ compiler was extended to experiment with new
features, at a time when the C++ language was still evolving.  Now that
the C++ standard is complete, some of those features are superseded by
superior alternatives.  Using the old features might cause a warning in
some cases that the feature will be dropped in the future.  In other
cases, the feature might be gone already.

   While the list below is not exhaustive, it documents some of the
options that are now deprecated:

`-fexternal-templates'
`-falt-external-templates'
     These are two of the many ways for g++ to implement template
     instantiation.  Note: Template Instantiation.  The C++ standard
     clearly defines how template definitions have to be organized
     across implementation units.  g++ has an implicit instantiation
     mechanism that should work just fine for standard-conforming code.

`-fstrict-prototype'
`-fno-strict-prototype'
     Previously it was possible to use an empty prototype parameter
     list to indicate an unspecified number of parameters (like C),
     rather than no parameters, as C++ demands.  This feature has been
     removed, except where it is required for backwards compatibility
     Note: Backwards Compatibility.

   The named return value extension has been deprecated, and will be
removed from g++ at some point.

   The use of initializer lists with new expressions has been
deprecated, and will be removed from g++ at some point.

   Floating point and complex template constant parameters are
deprecated, and will be removed from g++ at some point.