[Bug libc/2486] New: <netinet/in.h> does not compile in C++. Patch with conventional fix available.

[Bug libc/2486] New: <netinet/in.h> does not compile in C++. Patch with conventional fix available.

[dank at kegel dot com]

This is a classic, longstanding bug in all versions of glibc
and many other C libraries.  The essence is that

struct ip_opts {
    ...
    char ip_opts[40]; 
    ...

is not legal C++.  The traditional way of fixing this is to
capitalize the first letter of the member when compiling for C++.
A patch which does this, and applies to all versions of glibc is at
http://www.pengutronix.de/software/ptxdist/patches-0.5.2/glibc-2.2.5/generic/glibc-2.2.5-ip_opts.patch

There have been repeated requests to fix this over the years,
but for some reason, nobody filed a glibc bug report before!
Here are a few old posts about the problem in general, and how it's
been fixed elsewhere:
http://cvs.openbsd.org/cgi-bin/query-pr-wrapper?full=yes&numbers=681
http://gcc.gnu.org/ml/gcc/2002-05/msg00791.html
http://www.cygwin.com/ml/ecos-patches/2002-06/msg00005.html
http://www.netbsd.org/cgi-bin/query-pr-single.pl?number=19880

So, time to apply this patch in glibc head (and to the head of
the 2.3 branch, if possible)?

-- 
           Summary: <netinet/in.h> does not compile in C++.  Patch with
                    conventional fix available.
           Product: glibc
           Version: 2.4
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
        AssignedTo: drepper at redhat dot com
        ReportedBy: dank at kegel dot com
                CC: glibc-bugs at sources dot redhat dot com


http://sourceware.org/bugzilla/show_bug.cgi?id=2486

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[Bug libc/2486] <netinet/in.h> does not compile in C++. Patch with conventional fix available.

[dank at kegel dot com]

------- Additional Comments From dank at kegel dot com  2006-03-25 00:51 -------
Minor detail: the only version of gcc in common use
that reports this error is gcc-2.95.3. 
The gcc296 shipped by Fedora does not report this error.
So perhaps this is only of interest to embedded system developers
and/or those who use ancient compilers.

I'm marking this bug WONTFIX for now; affected
developers can apply the patch. 

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |WONTFIX


http://sourceware.org/bugzilla/show_bug.cgi?id=2486

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[Bug libc/2486] <netinet/in.h> does not compile in C++. Patch with conventional fix available.

[dank at kegel dot com]

------- Additional Comments From dank at kegel dot com  2006-03-25 00:52 -------
Created an attachment (id=940)
 --> (http://sourceware.org/bugzilla/attachment.cgi?id=940&action=view)
Patch to make glibc's in.h compatible with gcc-2.95.3 and perhaps other C++
compilers.


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[Bug libc/2486] <netinet/in.h> does not compile in C++. Patch with conventional fix available.

[mec at google dot com]

------- Additional Comments From mec at google dot com  2006-03-25 01:18 -------
Actually I think this is not a bug at all:

Older versions of gcc suppress the warning when compiling system header files.

Newer versions of gcc implement DR#80 for C++, which allows data fields to have
the same name as the class if the class does not have a user-declared constructor.

http://std.dkuug.dk/jtc1/sc22/wg21/docs/cwg_defects.html#80


-- 


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