[Mingw-users] Possible error in _mingw.h

[Anton Shepelev]

Hello, all

It seems that _mingw.h wrongly assumes that the
macro _XOPEN_SOURCE always expands into a non-emptry
string:

#if (_XOPEN_SOURCE) >= 500

Bryan Henderson, the author of Netpbm, have suggest-
ed the following fix:

#if (_XOPEN_SOURCE + 0) >= 500
--
Please, do not forward replies to my e-mail.


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[Keith Marshall]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

It seems that _mingw.h wrongly assumes that the macro _XOPEN_SOURCE

Nope. Usage in <_mingw.h> is correct; for POSIX.1-2008:
http://pubs.opengroup.org/onlinepubs/9699919799/functions/V2_chap02.html
| The _XOPEN_SOURCE Feature Test Macro
|
| An XSI-conforming application shall ensure that the feature test
| macro _XOPEN_SOURCE is defined with the value 700 before inclusion of
| any header. This is needed to enable the functionality described in
| The _POSIX_C_SOURCE Feature Test Macro and to ensure that the XSI
| option is enabled.

The value of 700 is specific to Issue 7 of POSIX.1 (POSIX.1-2008);
lesser values are applicable for earlier versions of the standard,
but in _every_ case, the application is _required_ to specify the
_XOPEN_SOURCE value for which conformance is desired.

#if (_XOPEN_SOURCE) >= 500

Where do you see that? Nowhere in <_mingw.h> do I see that particular
test; I _do_ see:

#if _XOPEN_SOURCE < 500

(among other similar tests, but _never_ with _XOPEN_SOURCE specified
in parentheses ... not that it really matters, if _XOPEN_SOURCE is
properly defined, as POSIX.1 stipulates).

Bryan Henderson, the author of Netpbm, have suggested the following
#if (_XOPEN_SOURCE + 0) >= 500

Bryan Henderson should correct the improper usage in Netpbm, (assuming
that this is where you are encountering the issue).

- --
Regards,
Keith.

Public key available from keys.gnupg.net
Key fingerprint: C19E C018 1547 DE50 E1D4 8F53 C0AD 36C6 347E 5A3F
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[Anton Shepelev]

Post by Keith Marshall

It seems that _mingw.h wrongly assumes that the
macro _XOPEN_SOURCE always expands into a non-
#if (_XOPEN_SOURCE) >= 500
Bryan Henderson, the author of Netpbm, have sug-
#if (_XOPEN_SOURCE + 0) >= 500

Where do you see that? Nowhere in <_mingw.h> do I
see that particular test

I quoted Bryan as a general example of his fix. I
should have either written so or quoted actual MinGW
code. Beg your pardon.
--
Please, do not forward replies to my e-mail.


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