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From: Zack Weinberg <zack@codesourcery.com>
To: nobody@gcc.gnu.org
Cc: gcc-prs@gcc.gnu.org,
Subject: Re: preprocessor/7457: failure preprocessing ## directive
Date: Wed, 31 Jul 2002 13:16:00 -0000 [thread overview]
Message-ID: <20020731201602.26047.qmail@sources.redhat.com> (raw)
The following reply was made to PR preprocessor/7457; it has been noted by GNATS.
From: Zack Weinberg <zack@codesourcery.com>
To: gnicholls@bluephoenixsolutions.com
Cc: gcc-gnats@gcc.gnu.org
Subject: Re: preprocessor/7457: failure preprocessing ## directive
Date: Wed, 31 Jul 2002 13:15:00 -0700
On Wed, Jul 31, 2002 at 07:50:39PM -0000, gnicholls@bluephoenixsolutions.com wrote:
> >Description:
> The following construct fails compilation:-
> #define LIB_SUFF ".so"
> #define SV_MODULE_NAME_STR "libdrv"##LIB_SUFF
The ## is completely unnecessary in this case. Remove it and your
code will work again.
The C standard specifies that the result of a token-paste is undefined
if the two tokens cannot be combined into a single token. This is
always true of two string constants. That is what the warning is
telling you.
zw
next reply other threads:[~2002-07-31 20:16 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-07-31 13:16 Zack Weinberg [this message]
-- strict thread matches above, loose matches on Subject: below --
2002-08-01 5:46 Gregory Nicholls
2002-07-31 15:21 neil
2002-07-31 12:56 gnicholls
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