Re: ISO C does not support %I64

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From: Keith Marshall <[email protected]>
To: [email protected]
Message-ID: <8e7f2ad6-7fdb-c46e-e868-330110ccc8bc-JlWs9+JhQMeJPt80KsDg5Q@public.gmane.org>
Subject: Re: [MinGW-Users] ISO C does not support %I64
References: <8335yn1v6a.fsf-mXXj517/[email protected]>
In-Reply-To: <8335yn1v6a.fsf-mXXj517/[email protected]>

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On 26/01/2021 17:10, Eli Zaretskii wrote:
> Could someone (Keith?) please remind me how to avoid the following
> compiler warning:
>=20
>   D:\usr\eli>gcc -Wall -pedantic -c tsnprintf.c

When building GCC, I configure with:

  --disable-build-format-warnings

but that's a package-specific configuration option.  For more general
use, you could try:

  D:\usr\eli>gcc -Wall -pedantic -Wno-pedantic-ms-format -c tsnprintf.c

Alternatively, insert:

  #pragma GCC diagnostic ignored "-Wformat"

into the source, (but that would suppress *all* format warnings), or
(more selectively) wrap the offending snprintf() call within:

  # pragma GCC diagnostic push
  # pragma GCC diagnostic ignored "-Wformat"
    snprintf (buf, 40, "%" PRIu64, bar);
  # pragma GCC diagnostic pop

(Unfortunately, I'm not aware of any pragma which would activate

  -Wno-pedantic-ms-format

in any more selective fashion, or I might suggest adding it to features.h=
).

> One way of getting rid of this is to use _snprintf instead, but is
> there a cleaner way?

I wouldn't recommend that: _snprintf() is *not* a drop-in replacement
for snprintf(), but __mingw_snprintf() might be a viable alternative;
(after all, it *is* MinGW's effective implementation of snprintf()).

> I thought some function attribute could solve this, perhaps?
The format attribute is already specified; I'm not aware of any modifier
to override the pedantic-ms-format behaviour.

--=20
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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