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Date: Wed, 19 Feb 2003 23:48:00 -0000
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To: gcc-bugs@gcc.gnu.org, gcc-prs@gcc.gnu.org, nobody@gcc.gnu.org,
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From: neil@gcc.gnu.org
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  nobody@gcc.gnu.org, rpm31@student.canterbury.ac.nz, gcc-gnats@gcc.gnu.org
Subject: Re: preprocessor/9764: Varargs macro extension incorrectly expands if the varargs argument is the macro itself
X-SW-Source: 2003-02/txt/msg00963.txt.bz2
List-Id: <gcc-prs.sourceware.org>

Synopsis: Varargs macro extension incorrectly expands if the varargs argument is the macro itself

State-Changed-From-To: open->closed
State-Changed-By: neil
State-Changed-When: Wed Feb 19 23:48:50 2003
State-Changed-Why:
    3.1 and later give the following, which is correct.  I've not checked 3.0, but I expect it's similar.
    
    $ cat /tmp/bar.c
    #define func(a, varargs...) _func(a, ##b)
    
    func(a, func(a, b));
    $ gcc -E /tmp/bar.c
    # 1 "/tmp/bar.c"
    # 1 "<built-in>"
    # 1 "<command line>"
    # 1 "/tmp/bar.c"
    
    
    /tmp/bar.c:3:19: pasting "," and "b" does not give a valid preprocessing token
    _func(a,b);

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=9764