NGPT + C++ = ?

Hi,

We wanted to switch to using NGPT for our MT apps (since the
non-Posixicity of LinuxThreads is killing us...) so of we went
installing 2.0.1 (first upgrading our system to 2.4.19, and patching
it)... so far so good...

We did not install ngpt in the default location but in /usr/local.
We had to change to makefile since it could not cope with that.

We moved on, trying to compile one of the modules of our project, which
does not use threads. We told the compiler (g++ 2.95.3) not to look in
the standard include paths, but rather in the paths we specified. Made
sure that /usr/local/include was before /usr/include.

So far so good. However, the compiler barfs on the netinet/in.h file
(through inclusion of bits/in.h) over the following construction:

<<< snippet from /usr/include/bits/in.h >>>

/* Structure used to describe IP options for IP_OPTIONS. The `ip_dst'
   field is used for the first-hop gateway when using a source route
   (this gets put into the header proper).  */
struct ip_opts
  {
    struct in_addr ip_dst;	/* First hop; zero without source route.  */
    char ip_opts[40];		/* Actually variable in size.  */

    ^^^^^^^^^^^^^^^^^
	this is where the compiler barfs on...
  };

<<< /snippet >>>

The output from g++:

[master]:Okay->gmake
g++ -fPIC -nostdinc -g -Wall -fexceptions -ftemplate-depth-25
-D_REENTRANT -DBUILDTIME="\"Tuesday 13 August 2002/09:22:09\""
-D_POSIX_PTHREAD_SEMANTICS
-I/usr/lib/gcc-lib/i486-suse-linux/2.95.3/include -I/usr/local/include
-I/usr/include -I/usr/include/g++ -I/jop200_0/verkout/pci/src/libs/ -c
-o /jop200_0/verkout/pci/src/libs/myutil/Repos/i686/hostname.o
hostname.cc ;
In file included from /usr/include/netinet/in.h:250,
                 from
/jop200_0/verkout/pci/src/libs/myutil/hostname.h:28,
                 from hostname.cc:21:
/usr/include/bits/in.h:69: ANSI C++ forbids data member `ip_opts' with
same name as enclosing class
gmake: *** [/jop200_0/verkout/pci/src/libs/myutil/Repos/i686/hostname.o]
Error 1
[master]:Okay->



When I cut and paste the struct definition (as in the snippet) into a .c
file and compile using gcc -> no problemo. If a write it to a .cc file
and compile with g++, I get exactly the same error about ANSI C++
forbidding etc.

This would indicate that somehow, the compiler does not recognize the
ip_opts as a C-style struct... 

I've tried with an extern "C" {} declaration around it (in the test
file) but that made no difference (was to be expected, of course, but
you could always give it a try).



Does anyone have an idea what's causing this and/or how to fix it?


The system is a dual PIII 1.13GHz running patched (fmutex-<..>-2.0.1
patch) 2.4.19 SMP kernel.





Thanx in advance,


-- 

Groeten,


Harro Verkouter                 Joint Institute for VLBI in Europe
[email protected]		Radiosterrenwacht Dwingeloo 
			        Postbus 2
tel.: (+31)(0)521-596516	7990 AA DWINGELOO, the Netherlands
fax.: (+31)(0)521-597332 	

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