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From: pwebb@yoyodyne.ncsa.uiuc.edu (Peter Webb)
Newsgroups: comp.windows.x.motif
Subject: g++ and Motif
Message-ID: <1991Feb9.210235.9051@ux1.cso.uiuc.edu>
Date: 9 Feb 91 21:02:35 GMT
Sender: news@ux1.cso.uiuc.edu (News)
Distribution: na
Organization: National Center for Supercomputing Applications at Urbana Illinois
Lines: 55

I'm having trouble getting a g++ program that uses Motif/X to compile.  I've
localized the problem as follows:


In <X11/Intrinsics.h> there is the following code fragment:

#if defined(__cplusplus) || defined(c_plusplus)
#define CONST const
/* make const String do the right thing */
#define String               char* 
#else
#define CONST
#endif /* __cplusplus */

This is followed (at some distance) by the following line:

typedef char *String;

So, when __cplusplus or c_plusplus is defined, the compiler tries to parse

typedef char *char *;

which is clearly non-sensical. 

I have installed patches to the X code up to number 18, the latest I saw on
expo.lcs.mit.edu.  Are there later patches?  Is this a known problem?  Are
there other fixes for compiling with g++?  

FYI, I am using g++ 1.37.1, Motif 1.1, X11R4 - patch level 18, on a Sun3 
running SunOS4.  

The error can be reproduced with the following code:

#include <stream.h>
#include <X11/Intrinsic.h>

main()
{
  Widget x;

  cout << "Party on!\n";
}

I use the following compile line:

g++ -I/stg2/GNU/lib/gcc-include -D__cplusplus -Dc_plusplus   -sun3 -o test2 test2.c 

And get this error:

In file included from //usr/include/sys/file.h:39, from /stg2/GNU/lib/g++-include/sys/file.h:18, from /usr/include/X11/Xos.h:81, from /usr/include/X11/Intrinsic.h:36, from test2.c:2:
/usr/include/sys/fcntlcom.h:62: warning: `flock' was declared `extern' and later `static'
In file included from test2.c:2:
/usr/include/X11/Intrinsic.h:102: parse error before `char'

			Peter Webb (pwebb@ncsa.uiuc.edu)