Re: c/10225: Unnamed structs aren't handled correctly in 3.3

Re: c/10225: Unnamed structs aren't handled correctly in 3.3

[Philipp Thomas]

The following reply was made to PR c/10225; it has been noted by GNATS.

From: Philipp Thomas <pthomas@suse.de>
To: Steven Bosscher <s.bosscher@student.tudelft.nl>
Cc: gcc-gnats@gcc.gnu.org, gcc-bugs@gcc.gnu.org, nobody@gcc.gnu.org,
	gcc-prs@gcc.gnu.org, aj@suse.de
Subject: Re: c/10225: Unnamed structs aren't handled correctly in 3.3
Date: Wed, 26 Mar 2003 18:33:47 +0100

 * Steven Bosscher (s.bosscher@student.tudelft.nl) [20030326 18:25]:
 
 > http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=10225
 > 
 > Hmm...  Didn't work with 2.95.3 apparently, so the
 > kernel had better not rely on this "feature".
 
 The code takes into account that gcc 2.95.3 doesn't support this. But seeing
 the extra macro stuff that generates the correct member names depending on
 the compiler used (e.g. you have to use ie->_IIF(iff,length) makes me really
 wonder why they even use the stuff .....
 
 Philipp
 
 -- 
 Philipp Thomas <pthomas@suse.de>
 SuSE Linux AG, Deutschherrnstr. 15-19, D-90429 Nuremberg, Germany

Re: c/10225: Unnamed structs aren't handled correctly in 3.3

[Steven Bosscher]

The following reply was made to PR c/10225; it has been noted by GNATS.

From: Steven Bosscher <s.bosscher@student.tudelft.nl>
To: gcc-gnats@gcc.gnu.org, gcc-bugs@gcc.gnu.org, nobody@gcc.gnu.org,
	pthomas@suse.de, gcc-prs@gcc.gnu.org, aj@suse.de
Cc:  
Subject: Re: c/10225: Unnamed structs aren't handled correctly in 3.3
Date: Wed, 26 Mar 2003 18:24:54 +0100

 http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=10225
 
 Hmm...  Didn't work with 2.95.3 apparently, so the
 kernel had better not rely on this "feature".
 
 Greetz
 Steven
 
 # gcc 10225.c -v
 Reading specs from /usr/lib/gcc-lib/i486-suse-linux/2.95.3/specs
 gcc version 2.95.3 20010315 (SuSE)
  /usr/lib/gcc-lib/i486-suse-linux/2.95.3/cpp0 -lang-c -v -D__GNUC__=2 
 -D__GNUC_MINOR__=95 -D__ELF__ -Dunix -D__i386__ -Dlinux -D__ELF__ 
 -D__unix__ -D__i386__ -D__linux__ -D__unix -D__linux -Asystem(posix) 
 -Acpu(i386) -Amachine(i386) -Di386 -D__i386 -D__i386__ -Di486 -D__i486 
 -D__i486__ 10225.c /tmp/ccba6Vbe.i
 GNU CPP version 2.95.3 20010315 (SuSE) (i386 Linux/ELF)
 #include "..." search starts here:
 #include <...> search starts here:
  /usr/local/include
  /usr/lib/gcc-lib/i486-suse-linux/2.95.3/include
  /usr/include
 End of search list.
 The following default directories have been omitted from the search path:
  /usr/include/g++
  /usr/lib/gcc-lib/i486-suse-linux/2.95.3/../../../../i486-suse-linux/include
 End of omitted list.
  /usr/lib/gcc-lib/i486-suse-linux/2.95.3/cc1 /tmp/ccba6Vbe.i -quiet 
 -dumpbase 10225.c -version -o /tmp/cc4V6K8j.s
 GNU C version 2.95.3 20010315 (SuSE) (i486-suse-linux) compiled by GNU C 
 version 2.95.3 20010315 (SuSE).
 10225.c:10: warning: useless keyword or type name in empty declaration
 10225.c:10: warning: empty declaration
 10225.c: In function `main':
 10225.c:18: structure has no member named `z'
 
 

c/10225: Unnamed structs aren't handled correctly in 3.3

[pthomas]

>Number:         10225
>Category:       c
>Synopsis:       Unnamed structs aren't handled correctly in 3.3
>Confidential:   no
>Severity:       critical
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          rejects-legal
>Submitter-Id:   net
>Arrival-Date:   Wed Mar 26 17:16:00 UTC 2003
>Closed-Date:
>Last-Modified:
>Originator:     pthomas@suse.de
>Release:        3.3 20030325 (prerelease)
>Organization:
>Environment:
x86_64-suse-linux
>Description:
When compiling the attached unnamed2.c with 3.3 mainline,
the code is rejected:

unnamed2.c:9: warning: declaration does not declare anything
unnamed2.c: In function `main':
unnamed2.c:16: error: structure has no member named `z'

Whereas 3.2.2 accepts the code, so this is clearly a regression.

Note that the ntfs driver in Linux kernel 2.5.65 uses this extension and thus breaks when compiled with 3.3.

>How-To-Repeat:
Compile the attached code.
>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted:
----gnatsweb-attachment----
Content-Type: text/x-csrc; name="unnamed2.c"
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename="unnamed2.c"

dHlwZWRlZiBzdHJ1Y3QKewoJaW50IHo7Cn10eXBlX3o7CiAgCnN0cnVjdCBCCnsKCWludCBpOwoJ
dHlwZV96Owp9OwoKCmludCBtYWluKHZvaWQpCnsKCXN0cnVjdCBCIEI7CglCLnogPSAxOwoKCXJl
dHVybiAwOwp9Cg==