Date: Tue, 1 Oct 2013 21:41:42 +0200 From: Dimitry Andric <dim@FreeBSD.org> To: Luigi Rizzo <rizzo@iet.unipi.it> Cc: freebsd-current@freebsd.org Subject: Re: CLANG reports an error with %b in printf(9) Message-ID: <373DB16B-0D5B-45BC-A243-917B21F81B25@FreeBSD.org> In-Reply-To: <20131001193017.GA72967@onelab2.iet.unipi.it> References: <20131001193017.GA72967@onelab2.iet.unipi.it>
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On Oct 1, 2013, at 21:30, Luigi Rizzo <rizzo@iet.unipi.it> wrote:
> This is on HEAD -- while compiling the kernel with CLANG and slightly
> higher warns level, i get errors of this kind (in multiple places):
>=20
> /usr/home/luigi/FreeBSD/head/sys/cam/cam_xpt.c:1069:27: error: invalid =
conversion specifier
> 'b' [-Werror,-Wformat-invalid-specifier]
> printf("%s%d: quirks=3D0x%b\n", periph->periph_name,
> ~^
> /usr/home/luigi/FreeBSD/head/sys/cam/cam_xpt.c:1070:36: error: data =
argument not used by
> format string [-Werror,-Wformat-extra-args]
> periph->unit_number, quirks, bit_string);
>=20
> Does anyone know how hard it is to either disable the warning locally
> (for a statement, function or file), or better to teach CLANG that
> printf(9) uses two arguments for %b ?
Hi Luigi,
It looks like you are overriding CWARNFLAGS? If you are using clang
from base, you can add -fformat-extensions, which has support for our
non-standard %b and %D specifiers. For clang from ports, there is no
solution except -Wno-format. See also the start of sys/conf/kern.mk.
-Dimitry
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