[C++ PATCH] PR13676 resubmission: Detect additional file extensions as C++ headers

["Alfred Minarik" <alfred dot minarik at aon dot at>]

This is the resubmission of a very simple patch to automatically recognice
files ending .hp,.hxx,.hpp,h++,.HPP as C++ headers. (As we accept
.cc,.cp,.cxx,.cpp,.C,.c++,.CPP for C++ sources) usefull for
PCH generation. First submitted 2003 and accepted. 
http://gcc.gnu.org/ml/gcc-patches/2004-01/msg01210.html

Copyright assignment is done.

Benjamin Kosnik has later requested another C++ header type for
template instantiation headers: tcc.

Included in this updated patch.

gcc/gcc/cp/Changelog
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2007-02-04  Alfred Minarik  <a.minarik@aon.at>

	* lang-specs.h: Add .hp,.hxx,.hpp,.h,.HPP,.tcc as c++ header
	* g++spec.c (lang_specific_driver): check them.

----

gcc/gcc/Changelog
----
2007-02-04  Alfred Minarik  <a.minarik@aon.at>

	* doc/invoke.texi: Add .hp,.hxx,.hpp,.h,.HPP,.tcc as c++ header

----

tested on i686-pc-linux-gnu (no regressions)

OK ? (I have no SVN write permission)

-Alfred

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