From: "Marc Marí" <marc.mari.barcelo@gmail.com>
To: Eric Blake <eblake@redhat.com>
Cc: qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [PATCH v2 01/16] x86: Convert conditional compilation of debug printfs to regular ifs
Date: Thu, 15 May 2014 11:56:11 +0200 [thread overview]
Message-ID: <20140515115611.62bb9cfb@crunchbang> (raw)
In-Reply-To: <53722E62.8000304@redhat.com>
El Tue, 13 May 2014 08:38:26 -0600
Eric Blake <eblake@redhat.com> escribió:
> Although __VA_ARGS__ is required by C99, the use of ##__VA_ARGS__ is a
> gcc extension; are you sure that all other supported compilers handle
> it? (I guess that's just clang)
>
> If you want something portable to C99, just use one fewer macro
> argument, so that you are guaranteed that __VA_ARGS__ will be
> non-empty (that is, subsume fmt into the ...):
>
> #define DEBUG(...) \
> QEMU_DPRINTF(DEVICE_ASSIGNMENT_DEBUG_ENABLED, \
> "pci_assign", __VA_ARGS__)
>
I found some problems to convert from ## __VA_ARGS__ to __VA_ARGS__ in
some parts, and as I asked in IRC, it was pointed that "our HACKING
document recommends the fmt, ## __VA_ARGS__ approach, and it obviously
works on all the compilers we care about". So I will leave this as it
is now.
Marc
next prev parent reply other threads:[~2014-05-15 9:56 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-05-13 7:02 [Qemu-devel] [PATCH v2 00/16] Convert conditional compilation of debug printfs Marc Marí
2014-05-13 7:02 ` [Qemu-devel] [PATCH v2 01/16] x86: Convert conditional compilation of debug printfs to regular ifs Marc Marí
2014-05-13 7:38 ` Andreas Färber
2014-05-13 15:15 ` Eric Blake
[not found] ` <53722E62.8000304@redhat.com>
2014-05-15 9:56 ` Marc Marí [this message]
2014-05-13 7:02 ` [Qemu-devel] [PATCH v2 02/16] s390: " Marc Marí
2014-05-13 9:04 ` Cornelia Huck
2014-05-13 14:45 ` Eric Blake
2014-05-13 7:02 ` [Qemu-devel] [PATCH v2 03/16] scsi: " Marc Marí
2014-05-13 7:02 ` [Qemu-devel] [PATCH v2 04/16] highbank: " Marc Marí
2014-05-13 10:06 ` Marc Marí
2014-05-13 7:02 ` [Qemu-devel] [PATCH v2 05/16] xilinx: " Marc Marí
2014-05-13 9:59 ` Marc Marí
2014-05-13 7:02 ` [Qemu-devel] [PATCH v2 06/16] spapr: " Marc Marí
2014-05-13 7:18 ` [Qemu-devel] [Qemu-ppc] " Alexander Graf
2014-05-13 7:02 ` [Qemu-devel] [PATCH v2 07/16] stellaris: " Marc Marí
2014-05-13 15:05 ` Eric Blake
2014-05-13 7:02 ` [Qemu-devel] [PATCH v2 08/16] tpm: " Marc Marí
2014-05-13 9:39 ` Marc Marí
2014-05-13 7:02 ` [Qemu-devel] [PATCH v2 09/16] i82374: " Marc Marí
2014-05-13 9:20 ` Marc Marí
2014-05-13 7:02 ` [Qemu-devel] [PATCH v2 10/16] i8257: " Marc Marí
2014-05-13 7:02 ` [Qemu-devel] [PATCH v2 11/16] rc4030: " Marc Marí
2014-05-13 9:16 ` Marc Marí
2014-05-13 7:02 ` [Qemu-devel] [PATCH v2 12/16] sd: " Marc Marí
2014-05-13 7:02 ` [Qemu-devel] [PATCH v2 13/16] isa: " Marc Marí
2014-05-13 7:02 ` [Qemu-devel] [PATCH v2 14/16] lan9118: " Marc Marí
2014-05-13 7:02 ` [Qemu-devel] [PATCH v2 15/16] pci-host: " Marc Marí
2014-05-13 9:13 ` Marc Marí
2014-05-13 7:02 ` [Qemu-devel] [PATCH v2 16/16] common: " Marc Marí
2014-05-13 9:05 ` Cornelia Huck
2014-05-13 15:21 ` Eric Blake
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