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Re: mbstate_t on HP-UX 11.11

From: Bruno Haible
Subject: Re: mbstate_t on HP-UX 11.11
Date: Sun, 21 Dec 2008 15:29:19 +0100
User-agent: KMail/1.9.9

Eric Blake wrote:
> this would be
> better written as a compile-time test that sees whether mbstate_t is
> visible first without, then with -D_XOPEN_SOURCE=500 added to CFLAGS, in
> case HP (or gcc fixincludes) fixes the problem, or in case someone else
> has a similar issue.

This has the potential of breaking unrelated platforms, in theory. But
your suggestion has good chances of working fine: The only other platform
which defines mbstate_t depending on some compiler flags is AIX.

On AIX 4 and 5, mbstate_t is defined if _XOPEN_SOURCE == 500.
But _XOPEN_SOURCE == 500 is already implied by -D_ALL_SOURCE and is also
implicit if none of _XOPEN_SOURCE, _POSIX_SOURCE, _ANSI_C_SOURCE is
defined. Therefore this test, applied to AIX, will be a no-op in most
cases and a fix (like for HP-UX) in the rare case that the user has
already specified _POSIX_SOURCE or _ANSI_C_SOURCE. Note that the
proposed test should be run *after* -D_ALL_SOURCE has been added to
the compiler flags.

If you write a patch for this, I can test it for you (on HP-UX, AIX,
and others).


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