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Date: Tue, 28 Apr 2015 12:45:47 +0200
From: Corinna Vinschen <corinna-cygwin@cygwin.com>
To: cygwin@cygwin.com
Subject: Re: Incorrect compile warning, possible bug in inttypes.h
Message-ID: <20150428104547.GZ3657@calimero.vinschen.de>
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Hi Cary,

On Apr 27 22:52, Cary R. wrote:
> The following code:
>=20
> #include <stdio.h>
> #include <inttypes.h>
>=20
> int main()
> {
>         int32_t ival =3D 1;
>         uint32_t uval =3D 2;
>=20
>         printf("int =3D %"PRId32", uint =3D %"PRIu32".\n", ival, uval);
>         return 0;
> }
>=20
>=20
> when compiled with either gcc or clang on a 32-bit system and with the -W=
all flag produces the following warnings:
>=20
> tmp.c: In function =E2=80=98main=E2=80=99:
> tmp.c:9:5: warning: format =E2=80=98%ld=E2=80=99 expects argument of type=
 =E2=80=98long int=E2=80=99, but argument 2 has type =E2=80=98int32_t=E2=80=
=99 [-Wformat=3D]
>          printf("int =3D %"PRId32", uint =3D %"PRIu32".\n", ival, uval);
>          ^
> tmp.c:9:5: warning: format =E2=80=98%lu=E2=80=99 expects argument of type=
 =E2=80=98long unsigned int=E2=80=99, but argument 3 has type =E2=80=98uint=
32_t=E2=80=99 [-Wformat=3D]
> tmp.c:9:5: warning: format =E2=80=98%ld=E2=80=99 expects argument of type=
 =E2=80=98long int=E2=80=99, but argument 2 has type =E2=80=98int32_t=E2=80=
=99 [-Wformat=3D]
> tmp.c:9:5: warning: format =E2=80=98%lu=E2=80=99 expects argument of type=
 =E2=80=98long unsigned int=E2=80=99, but argument 3 has type =E2=80=98uint=
32_t=E2=80=99 [-Wformat=3D]
>=20
> I'm not sure why the double report for this, but both gcc and clang do
> the same thing. This looks to be an issue that is generated because a
> long is 32 bits on a 32-bit system and in inttypes.h __have_long32 is
> likely defined and that is forcing the use of the 'l' formats when
> that is incorrect for at least these two 32 bit types.

That looks like the culprit, yes.  This is part of the newlib changes to
stdint.h/inttypes.h, and this is apparently a problem.  Just because
long is a 32 bit type doesn't mean it's the base type of int32_t/uint32_t.
What bugs me most is that I tried to test the changes and failed to see
this problem.  Grr.

I'll discuss this on the newlib mailing list.


Thanks,
Corinna

--=20
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

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