preprocessor/2900: Does not handle concatenation of macros properly

[sean@mcneil.com]

>Number:         2900
>Category:       preprocessor
>Synopsis:       Does not handle concatenation of macros properly
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue May 22 11:16:00 PDT 2001
>Closed-Date:
>Last-Modified:
>Originator:     Sean McNeil
>Release:        3.1 20010522 (experimental)
>Organization:
>Environment:
Linux 2.4.2 host OS cross to arm-wrs-vxworks
>Description:
The cpp does not properly handle the concatenation (##) in macros.  This is a regression in cpp from gcc 2.95.3.  Attached is a short example that produces the error.
>How-To-Repeat:
Attempt to compile:

arm-wrs-vxworks-gcc -c cpp_recurse.c
cpp_recurse.c:21:5: warning: pasting "PUSH_VALUES2" and "(" does not give a valid preprocessing token

with version 2.95.3 all is well.
>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted:
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