Re: [Mingw-users] Does MinGW not support -std=c++11 flag?

[Keith M. <kei...@us...>]

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On 20/09/16 19:48, DAVENPORT, MARC wrote:
> Also as a related question, when is _NO_OLDNAMES defined?

Only when *you* choose to define it, (and why on earth would you do
that, unless you've been brainwashed into the Microsoft mindset, to
believe that POSIX type names are bad?)

> Does std=c++11 define that?

No.

> I ask because allegro 5 programs don't compile when off_t is not 
> defined, and sys/types.h only defines off_t when _NO_OLDNAMES is 
> undefined.

That's not what I see, in the current mingwrt-3.22.1 <sys/types.h>;
off_t is a POSIX type name, and it is defined when _POSIX_C_SOURCE
is defined.

This is off-topic for this thread, but since you ask: to comply with
POSIX, any application which depends on POSIX features is *supposed*
to define _POSIX_C_SOURCE (or corresponding _XOPEN_SOURCE, for which
_POSIX_C_SOURCE is implied) *before* it includes *any* header.  FWIW,
MinGW will implicitly define _POSIX_C_SOURCE, *unless* you choose to
compile with any option which implies __STRICT_ANSI__; if you choose
the latter course, then *you* must *explicitly* take care to define
_POSIX_C_SOURCE, if you expect to use POSIX data types.  I can only
speculate that allegro 5 violates this POSIX.1 requirement.

- -- 
Regards,
Keith.

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