From:	pavenis AT lanet DOT lv
To:	djgpp-workers AT delorie DOT com
Date:	Tue, 27 Mar 2001 11:45:51 +0300
MIME-Version:	1.0
Subject:	Problems with using std::* in DJGPP headers
Message-ID:	<3AC07D6F.24425.6B1305@localhost>
X-mailer:	Pegasus Mail for Win32 (v3.12c)
Reply-To:	djgpp-workers AT delorie DOT com

Some of DJGPP headers (current CVS) uses 
	
using std::something;

to get symbols visible in global namespace (when C++ compiler is 
being used, of course).

When some of header files doesn't put these definitions in std 
namespace I'm getting compilation error with gcc-3.0 prerelease.

One of examples of such bad headers in current CVS is go32.h which 
defines size_t when included early enough but not in std namespace.
Other such headers (which doesn't put definitions in std namespace 
are stdio.h, stdlib.h, string.h, time.h, unistd.h and others). I only tested
definitions of size_t

As result I'm getting compilation error on following source

#include <go32.h>
#include <stddef.h>

or 

#include <stdio.h>
#include <stddef.h>

I think one need binaries of gcc-3.0 snapshot for DJGPP to mess with 
these things or problems cannot be avoided

Here is one example which shows  how we could workaround these 
problems (tested with gcc-3.0 snapshot only)

#define __DJ_size_t	typedef long unsigned int size_t;

#ifdef __cplusplus
#  define __DJ_std_namespace_begin namespace std {
#  define __DJ_std_namespace_end   }
#else
#  define __DJ_std_namespace_begin 
#  define __DJ_std_namespace_end   
#endif

#define __DJ_apply_def_std(a) __DJ_std_namespace_begin a 
__DJ_std_namespace_end \

__DJ_apply_def_std(__DJ_size_t);
#define __DJ_size_t 

__DJ_apply_def_std(__DJ_size_t);

-----------------  output of gcc -E  -------------------------------------------
# 1 "bar.cc"
# 1 "c:/djgpp/bin2/../lib/gcc-
lib/djgpp/3.0/../../../../include/sys/version.h" 1
# 2 "bar.cc" 2
# 14 "bar.cc"
namespace std { typedef long unsigned int size_t; };


namespace std { };



Andris

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