g++ does not set correct Preprocessorvariable if Fileextension is .cpp

[Klaus Steinberger <Klaus dot Steinberger at Physik dot Uni-Muenchen dot DE>]

Hello,

I've trying to port KDE to an SGI IRIX system. Through this work, I discovered
a bug in g++. It does not set the correct preprocessor variables if the
extension is not the usual .C,.cxx,.c++. The KDE people did use .cpp (for
whatever reason). g++ then defines -D__LANGUAGE_C instead of the correct
value -D__LANGUAGE_C_PLUS_PLUS, which is needed for IRIX include Files.

egcs Version:  
distr@beethoven> gcc -v
Reading specs from /usr/local/lib/gcc-lib/mips-sgi-irix6.4/egcs-2.91.66/specs
gcc version egcs-2.91.66 19990314 (egcs-1.1.2 release)

I append a patch which adds the necessary things to gcc/config/mips/mips.h,
but I think the mechanism in mips.h to decide between C and C++ should be 
changed to more generic way.

Sincerely,
Klaus

-- 
Klaus Steinberger               Beschleunigerlabor der TU und LMU Muenchen
Phone: (+49 89)289 14287        Hochschulgelaende, D-85748 Garching, Germany
FAX:   (+49 89)289 14280        EMail: Klaus.Steinberger@Physik.Uni-Muenchen.DE
URL: http://www.bl.physik.tu-muenchen.de/~k2/
In a world without fences and walls, who needs Windows and Gates?
*** mips.h.orig	Tue Jun  8 14:11:01 1999
--- mips.h	Tue Jun  8 14:11:30 1999
***************
*** 918,929 ****
  #ifndef CPP_SPEC
  #define CPP_SPEC "\
  %{.cc:	-D__LANGUAGE_C_PLUS_PLUS -D_LANGUAGE_C_PLUS_PLUS} \
  %{.cxx:	-D__LANGUAGE_C_PLUS_PLUS -D_LANGUAGE_C_PLUS_PLUS} \
  %{.C:	-D__LANGUAGE_C_PLUS_PLUS -D_LANGUAGE_C_PLUS_PLUS} \
  %{.m:	-D__LANGUAGE_OBJECTIVE_C -D_LANGUAGE_OBJECTIVE_C -D__LANGUAGE_C -D_LANGUAGE_C} \
  %{.S:	-D__LANGUAGE_ASSEMBLY -D_LANGUAGE_ASSEMBLY %{!ansi:-DLANGUAGE_ASSEMBLY}} \
  %{.s:	-D__LANGUAGE_ASSEMBLY -D_LANGUAGE_ASSEMBLY %{!ansi:-DLANGUAGE_ASSEMBLY}} \
! %{!.S: %{!.s: %{!.cc: %{!.cxx: %{!.C: %{!.m: -D__LANGUAGE_C -D_LANGUAGE_C %{!ansi:-DLANGUAGE_C}}}}}}} \
  %(subtarget_cpp_size_spec) \
  %{mips3:-U__mips -D__mips=3 -D__mips64} \
  %{mips4:-U__mips -D__mips=4 -D__mips64} \
--- 918,930 ----
  #ifndef CPP_SPEC
  #define CPP_SPEC "\
  %{.cc:	-D__LANGUAGE_C_PLUS_PLUS -D_LANGUAGE_C_PLUS_PLUS} \
+ %{.cpp:	-D__LANGUAGE_C_PLUS_PLUS -D_LANGUAGE_C_PLUS_PLUS} \
  %{.cxx:	-D__LANGUAGE_C_PLUS_PLUS -D_LANGUAGE_C_PLUS_PLUS} \
  %{.C:	-D__LANGUAGE_C_PLUS_PLUS -D_LANGUAGE_C_PLUS_PLUS} \
  %{.m:	-D__LANGUAGE_OBJECTIVE_C -D_LANGUAGE_OBJECTIVE_C -D__LANGUAGE_C -D_LANGUAGE_C} \
  %{.S:	-D__LANGUAGE_ASSEMBLY -D_LANGUAGE_ASSEMBLY %{!ansi:-DLANGUAGE_ASSEMBLY}} \
  %{.s:	-D__LANGUAGE_ASSEMBLY -D_LANGUAGE_ASSEMBLY %{!ansi:-DLANGUAGE_ASSEMBLY}} \
! %{!.S: %{!.s: %{!.cc: %{!.cpp: %{!.cxx: %{!.C: %{!.m: -D__LANGUAGE_C -D_LANGUAGE_C %{!ansi:-DLANGUAGE_C}}}}}}}} \
  %(subtarget_cpp_size_spec) \
  %{mips3:-U__mips -D__mips=3 -D__mips64} \
  %{mips4:-U__mips -D__mips=4 -D__mips64} \

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