Re: c++/5821: Solaris: C++ compiler defines _XOPEN_SOURCE

[Phil Edwards <phil at jaj dot com>]

On Mon, Mar 04, 2002 at 11:55:31PM +0100, Dimitri Papadopoulos wrote:
> > It's not "practical".  It's "required".  As in, if it's not defined,
> > nothing works.
> 
> As I said if libstdc++ requires _XOPEN_SOURCE just
> define it when building libstdc++. But then maybe
> it's required by libstdc++ headers made available to
> end-users. In that case I do understand the problem
> better. But it still can be worked around by writing
> wrappers or modifying headers appropriately. Then
> maybe it's still something else: in that case please
> someone explain me. I have good knowledge of Solaris
> and I may help to remove the need for _XOPEN_SOURCE.

Large parts of the C++ standard library are actually defined in the header
files (until the compiler supports 'export'), so maintainer build-time
details are often also end-user compile-time details.


> Finally if your concern is 64-bit targets, then you
> need to define 
> 	-xarch=v9 -D_XOPEN_SOURCE=500 -D__EXTENSIONS__
> as documented in the solaris documentation, but still,
> the Solaris environment leaves it to the user to define
> these variables.

This would be handled by the compiler config files for 64-bit Solaris.


> > This has been discussed to death on the mailing lists.  See the archives
> > before resubmitting the same bug report.
> 
> This bug report was not in the archives when this bug was
> reported.

I may have confused you with one of the other reporters.  If I did,
I apologize.

> And in any case searching the archive gives:
> 	No matches were found for '_xopen_source and solaris'.
> Consider fixing the search engine first...

Eh?  I get 72 matches for both terms, and 234 matches for _XOPEN_SOURCE
alone.


> I do understand you have limited time, and I do appreciate
> your efforts to bring out a free compiler. But maybe someone
> could have told me this was discussed in the mailing lists
> and given a short explanation (something better than "It's
> not practical.  It's required." which is supposed to make
> me feel like an idiot because I don't understand what other
> oh so brilliant people understand).
> 
> I've been chasing bugs in GCC for some years (few bugs maybe,
> but still) and would have expected a different tone in your

I apologize for my tone.  The _XOPEN_SOURCE kludge -- and yes, it is a
kludge, we would like to replace it with something better -- keeps getting
brought up over and over by people who simply assert that it's easy to
"fix" without ever actually demonstrating how.  After a while it becomes
bothersome.

I think I'll add this to the libstdc++ FAQ, and provide a link to the
mailing list archives.


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