From:	Richard Dawe <richdawe AT bigfoot DOT com>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Problem with g++ 2.95.2 & C structures
Date:	Sat, 04 Nov 2000 14:36:19 +0000
Organization:	Customer of Energis Squared
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To:	djgpp AT delorie DOT com
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Reply-To:	djgpp AT delorie DOT com

Hello.

I'm having a problem with structures and C++. Here is a program that
demonstrates the problem:

extern "C"
{
  struct pointless {
    int pointless;
  };
}

int main (void)
{
  struct pointless no_point;

  return(1);
}

If I try making this, I get the following problem:

bash-2.04$ make test-struct
gpp     test-struct.cc   -o test-struct
test-struct.cc:5: ANSI C++ forbids data member `pointless' with same name
as enclosing class
make.exe: *** [test-struct] Error 1

Why doesn't this work? Surely the extern statement should inform the
compiler it's in C code, not C++?

Here's the gpp version:

bash-2.04$ gpp -v
Reading specs from c:/djgpp/lib/gcc-lib/djgpp/2.952/specs
gcc version 2.95.2 19991024 (release)

FYI on Linux this works fine with egcs:

iolanthe:/usr/include =] g++ -v
Reading specs from /usr/lib/gcc-lib/i386-redhat-linux/egcs-2.91.66/specs
gcc version egcs-2.91.66 19990314/Linux (egcs-1.1.2 release)

I'd appreciate help with this problem, because the libsocket header
netinet/in.h has a structure called ip_opts with a field called ip_opts.
This stops C++ programs using libsocket from building. :(

TIA, bye,

-- 
Richard Dawe
[ mailto:richdawe AT bigfoot DOT com | http://www.bigfoot.com/~richdawe/ ]

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