c++/5845: Seemingly correct code gets "syntax error", but only on gcc 3.0

[rodrigc@gcc.gnu.org]

Synopsis: Seemingly correct code gets "syntax error", but only on gcc 3.0

State-Changed-From-To: open->feedback
State-Changed-By: rodrigc
State-Changed-When: Tue Mar  5 18:06:06 2002
State-Changed-Why:
    There is a bug in the configure script for Common C++.
    http://cplusplus.sourceforge.net
    
    During the configure, it does not detect the
    <exception> header file:
    
    configure:5784: checking for exception
    configure:5794: gcc -E  conftest.c >/dev/null 2>conftest.out
    configure:5790:21: exception: No such file or directory
    configure: failed program was:
    #line 5789 "configure"
    #include "confdefs.h"
    #include <exception>
    
    Basically the problem is in configure.in:
    
    AC_CHECK_HEADERS(sys/file.h syslog.h posix_evlog.h exception ss.h)    
    
    What happens is, the configure script creates
    a header file with these two lines:
    #include "confdefs.h"
    #include <exception>
    
    and then calls:
    gcc -E
    on that file.
    
    The C compiler doesn't know where the C++ headers are,
    so the test fails.
    
    Can you tell the Common C++ people to improve their
    autoconf test?

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=5845