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Re: preprocessor/9650: string literal contactenation doesn't work with #include


The following reply was made to PR preprocessor/9650; it has been noted by GNATS.

From: Neil Booth <neil@daikokuya.co.uk>
To: frey waid <waid@cisco.com>
Cc: neil@gcc.gnu.org, gcc-bugs@gcc.gnu.org, gcc-prs@gcc.gnu.org,
	nobody@gcc.gnu.org, gcc-gnats@gcc.gnu.org
Subject: Re: preprocessor/9650: string literal contactenation doesn't work with #include
Date: Mon, 10 Feb 2003 23:09:48 +0000

 frey waid wrote:-
 
 > i tried that but it doesn't work consistently with the newer prescan semantics. 
 > for example, if i did this:
 
 Prescan semantics haven't changed.  Apart from removal of the odd
 segfault ;-)
 
 > #include COMP_INC(me, mips/hello.h)
 > 
 > you'd think it'd expand with the below method:
 > 
 > #include "me/include/mips/hello.h"
 > 
 > unfortunately, mips is a predefined macro.  so it expands to "1".  is there a
 > work around for this without having to undefine it?
 
 No, that's the way C works, because mips is lexed as a token in its own
 right.  You need to use a different path, or #undef mips.  Or, latest
 versions of GCC won't invade your namespace like this with -ansi.  Prior
 versions of GCC were somewhat unpredictable.
 
 Neil.


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