c++/4661: g++ recognize a c++ header file (.hpp) as c header file

[acss@altavista.net]

>Number:         4661
>Category:       c++
>Synopsis:       g++ recognize a c++ header file (.hpp) as c header file
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Thu Oct 25 16:26:06 PDT 2001
>Closed-Date:
>Last-Modified:
>Originator:     acss@altavista.net
>Release:        gcc 3.0.1
>Organization:
>Environment:
Sun SPARC
Solaris 5.6
>Description:
C++ included headers, located outside current directory are evaluated as C headers.

If we include a .hpp file in a C++ source file (either with <> or "") and they are outside, we receive the lots of errors like:
In file included from smalldate.cpp:4:
/opt/tuxedo/include/smalldate.hpp:29: declaration of C function `const 
   middleware::smalldate middleware::operator-(const middleware::smalldate&, 
   int)' conflicts with
/opt/tuxedo/include/smalldate.hpp:27: previous declaration `const int 
   middleware::operator-(const middleware::smalldate&, const 
   middleware::smalldate&)' here

Actually, these are overloaded C++ functions ...
>How-To-Repeat:
cat> test.hpp
int test(int i);
int test(float f);
ctrl-D
mv test.hpp <somewhere on the C++ include path>
cat> test.cpp
#include <test.hpp>
int main() {
 test(0);
}
ctrl-D
g++ -c test.cpp
>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted: