preprocessor/7457: failure preprocessing ## directive

[gnicholls@bluephoenixsolutions.com]

>Number:         7457
>Category:       preprocessor
>Synopsis:       failure preprocessing ## directive
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Jul 31 12:56:00 PDT 2002
>Closed-Date:
>Last-Modified:
>Originator:     Gregory Nicholls
>Release:        gcc v3.1
>Organization:
>Environment:
hpux11 and solaris
>Description:
The following construct fails compilation:-
#define LIB_SUFF ".so"
#define SV_MODULE_NAME_STR "libdrv"##LIB_SUFF

 This used to work on an earlier gcc and it also works on native
aix c89 as well as native hpux cc. This is old code so I'm not sure if 
it's really a gcc bug or 'undefined behaviour'. In any case it's
easy to repeat.
>How-To-Repeat:
compile supplied test program. Should fail with the following:
gcc_test.c:6:29: warning: pasting ""libdrv"" and "LIB_SUFF" does not give a vali
d preprocessing token
>Fix:
Dont' know <grin>.
>Release-Note:
>Audit-Trail:
>Unformatted:
----gnatsweb-attachment----
Content-Type: application/x-unknown-content-type-cfile; name="gcc_test.c"
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename="gcc_test.c"

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