>860
ありがとうございます。がんばってみます。

>868
gcc(1)に

file.cc
file.cp
file.cxx
file.cpp
file.CPP
file.c++
file.C
C++ source code which must be preprocessed. Note that in .cxx, the
last two letters must both be literally x. Likewise, .C refers to
a literal capital C.

とあるので、そうなのかと思ったんですが...