Bug#138201: marked as done (cpp: macro expansion inside macro calling)
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and subject line Bug#138201: cpp: macro expansion inside macro calling
has caused the attached Bug report to be marked as done.
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Date: Wed, 13 Mar 2002 18:21:01 -0300
From: jrm@autsens.com
To: Debian Bug Tracking System <maintonly@bugs.debian.org>
Subject: cpp: macro expansion inside macro calling
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Package: cpp
Version: 2:2.95.4-9
Severity: wishlist
For example, if a define two macros:
#define a_bit P4,0x08
#define setbit(port,bit) port ## OUT |= bit
And, considering the following line (source code):
setbit(a_bit);
It will generate an error: "macro `setbit' used with just one arg"
It occurs because a_bit will be expanded after setbit. Ok, it would be
desirable in some situations, but in this case, it may be better if
a_bit would be expanded first.
Please, let me know if I am doing anything wrong, if there is a way to
do something similar to that. Thanks!
-- System Information
Debian Release: 3.0
Architecture: i386
Kernel: Linux mantis 2.2.19 #1 Sat Oct 20 18:09:49 EST 2001 i686
Locale: LANG=pt_BR, LC_CTYPE=pt_BR
Versions of packages cpp depends on:
ii cpp-2.95 1:2.95.4-1 The GNU C preprocessor.
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>From doko@cs.tu-berlin.de Sun Dec 29 07:28:32 2002
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From: Matthias Klose <doko@cs.tu-berlin.de>
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Date: Sun, 29 Dec 2002 14:27:35 +0100
To: jrm@autsens.com, 138201-done@bugs.debian.org
Subject: Re: Bug#138201: cpp: macro expansion inside macro calling
In-Reply-To: <20020313212101.GA15174@mantis.autsens.localnet>
References: <20020313212101.GA15174@mantis.autsens.localnet>
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jrm@autsens.com writes:
> Package: cpp
> Version: 2:2.95.4-9
> Severity: wishlist
>
> For example, if a define two macros:
>
> #define a_bit P4,0x08
> #define setbit(port,bit) port ## OUT |= bit
>
> And, considering the following line (source code):
>
> setbit(a_bit);
>
> It will generate an error: "macro `setbit' used with just one arg"
>
> It occurs because a_bit will be expanded after setbit. Ok, it would be
> desirable in some situations, but in this case, it may be better if
> a_bit would be expanded first.
>
> Please, let me know if I am doing anything wrong, if there is a way to
> do something similar to that. Thanks!
macro arguments are expanded first. Should define setbit2 as current
setbit, and
#define setbit(x) setbit2(x)
will work. Thanks to Neil Booth pointing this out.
The "workaround" suggested is the correct solution:
From: Kalle Olavi Niemitalo <kon@iki.fi>
#define a_bit P4,0x08
#define setbit(port,bit) port ## OUT |= bit
#define setbit1(args) setbit(args)
setbit1(a_bit)
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