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Date: Tue, 29 Apr 1997 12:40:05 -0700 (PDT)
From: j.loverso@opengroup.org
To: freebsd-gnats-submit@freebsd.org
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Subject: kern/3419: __attribute__((__unused__)) doesn't work
Sender: owner-bugs@freebsd.org
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Precedence: bulk


>Number:         3419
>Category:       kern
>Synopsis:       __attribute__((__unused__)) doesn't work
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Tue Apr 29 12:50:01 PDT 1997
>Last-Modified:
>Originator:     John LoVerso
>Organization:
Open Group Research Inst
>Release:        2.2.1
>Environment:
FreeBSD freebase.osf.org 2.2.1-RELEASE FreeBSD 2.2.1-RELEASE #0: Thu Mar 27 08:40:39 EST 1997     loverso@freebase.osf.org:/usr/src/sys/compile/USEFUL+snd  i386

>Description:
The system comes with GCC 2.7.2.1.  /usr/include/sys/cdefs.h says:

        #if __GNUC__ == 2 && __GNUC_MINOR__ >= 7 || __GNUC__ >= 3
        #define __dead
        #define __dead2         __attribute__((__noreturn__))
        #define __pure
        #define __pure2         __attribute__((__const__))
        #define __unused        __attribute__((__unused__))
        #endif

However,I tried to compile Berk DB 2.0.  It has code like this:
(starting at line 340)

        typedef struct _hoffpage {
                u_int8_t  type;         /*    00: Page type and delete flag. */
                u_int8_t  __unused[3];  /* 01-03: Padding, unused. */

When it gets compiled, it complains:

        ../dist/../include/db_page.h:342: parse error before `['
        ../dist/../include/db_page.h:342: warning: no semicolon at end of struct
 or union

It appears that  __attribute__((__unused__)) doesn't work.


I'm not sure which catagory this bug is in.  Is it kern?  (/usr/include/sys/cdef.h)
Is it GNU (gcc).  Is it misc?
>How-To-Repeat:
Try to compile DB 2.0

fetch ftp://ftp.sleepycat.com/pub/db.tar.gz
tar zxvf db.tar.gz
cd db-2.0.4/build.unix
../dist/configure
make

>Fix:
Fix GCC?
Fix /usr/include/sys/cdefs.h
>Audit-Trail:
>Unformatted: