[Bug c/17026] New: Error at last empty case in switch block.

[Bug c/17026] New: Error at last empty case in switch block.

[do8896 at db dot com]

GCC misunderstanding empty case in switch, such as:


switch(hmm)
{
  case 0:
    do_smth();
  case 1: //<-- gcc stops here
}

or

switch(hmm)
{
  case 0:
    do_smth();
  default: //<-- gcc stops here
}

Those code-constructions meets in libgda and libgnome-db( and may be all of this
codes normally compiled under older versions of gcc)

-- 
           Summary: Error at last empty case in switch block.
           Product: gcc
           Version: 3.4.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: do8896 at db dot com
                CC: gcc-bugs at gcc dot gnu dot org
 GCC build triplet: i686-pc-linux-gnu
  GCC host triplet: i686-pc-linux-gnu
GCC target triplet: i686-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17026

[Bug c/17026] Error at last empty case in switch block.

[do8896 at db dot com]

------- Additional Comments From do8896 at db dot com  2004-08-14 13:48 -------
Created an attachment (id=6924)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=6924&action=view)
Preprocessed file of examples


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17026

[Bug c/17026] Error at last empty case in switch block.

[falk at debian dot org]

------- Additional Comments From falk at debian dot org  2004-08-14 13:54 -------
This is invalid code, a label must be followed by a statement.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |INVALID


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17026

[Bug c/17026] Error at last empty case in switch block.

[do8896 at db dot com]

------- Additional Comments From do8896 at db dot com  2004-08-14 13:53 -------
Compile command: gcc -v -save-temps -o a a.c
Compiler stderr&stdout output:

Reading specs from /usr/lib/gcc/i686-pc-linux-gnu/3.4.1/specs
Configured with: /var/tmp/portage/gcc-3.4.1-r2/work/gcc-3.4.1/configure
--prefix=/usr --bindir=/usr/i686-pc-linux-gnu/gcc-bin/3.4
--includedir=/usr/lib/gcc/i686-pc-linux-gnu/3.4.1/include
--datadir=/usr/share/gcc-data/i686-pc-linux-gnu/3.4
--mandir=/usr/share/gcc-data/i686-pc-linux-gnu/3.4/man
--infodir=/usr/share/gcc-data/i686-pc-linux-gnu/3.4/info --enable-shared
--host=i686-pc-linux-gnu --target=i686-pc-linux-gnu --with-system-zlib
--enable-languages=c,c++ --enable-threads=posix --enable-long-long
--disable-checking --disable-libunwind-exceptions --enable-cstdio=stdio
--enable-version-specific-runtime-libs
--with-gxx-include-dir=/usr/lib/gcc/i686-pc-linux-gnu/3.4.1/include/g++-v3
--with-local-prefix=/usr/local --disable-werror --enable-shared --enable-nls
--without-included-gettext --disable-multilib --enable-__cxa_atexit
--enable-clocale=gnu
Thread model: posix
gcc version 3.4.1 20040803 (Gentoo Linux 3.4.1-r2, ssp-3.4-2, pie-8.7.6.5)
 /usr/libexec/gcc/i686-pc-linux-gnu/3.4.1/cc1 -E -quiet -v a.c -mtune=pentiumpro
-o a.i
ignoring nonexistent directory "/usr/local/include"
ignoring nonexistent directory
"/usr/lib/gcc/i686-pc-linux-gnu/3.4.1/../../../../i686-pc-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
 /usr/lib/gcc/i686-pc-linux-gnu/3.4.1/include
 /usr/include
End of search list.
a.c:24:2: warning: no newline at end of file
 /usr/libexec/gcc/i686-pc-linux-gnu/3.4.1/cc1 -fpreprocessed a.i -quiet
-dumpbase a.c -mtune=pentiumpro -auxbase a -version -o a.s
GNU C version 3.4.1 20040803 (Gentoo Linux 3.4.1-r2, ssp-3.4-2, pie-8.7.6.5)
(i686-pc-linux-gnu)
	compiled by GNU C version 3.4.1 20040803 (Gentoo Linux 3.4.1-r2, ssp-3.4-2,
pie-8.7.6.5).
GGC heuristics: --param ggc-min-expand=38 --param ggc-min-heapsize=15717
a.c: In function `stub1':
a.c:12: error: label at end of compound statement
a.c: In function `main':
a.c:21: error: too few arguments to function `stub1'
a.c:23: error: label at end of compound statement


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17026

[Bug c/17026] Error at last empty case in switch block.

[jsm at polyomino dot org dot uk]

------- Additional Comments From jsm at polyomino dot org dot uk  2004-08-14 15:01 -------
Subject: Re:  New: Error at last empty case in switch block.

On Sat, 14 Aug 2004, do8896 at db dot com wrote:

> Those code-constructions meets in libgda and libgnome-db( and may be all of this
> codes normally compiled under older versions of gcc)

This undocumented extension was deprecated (with a mandatory warning when 
it was used) in 3.0, released June 18, 2001, and removed in 3.4.0, 
released April 18, 2004.  How long would you expect undocumented 
extensions to be deprecated before being removed, if nearly three years 
isn't enough?  The normal period for most deprecations is a single release 
(e.g. deprecate in 3.3 and remove in 3.4), which allows about a year for 
people to see and fix the warnings, but undocumented extensions are 
subject to change and removal without deprecation period - indeed, removal 
by accident if someone didn't realise they were part of the extended 
language.  The ease of fixing - in this case, by adding a single semicolon 
- is a relevant factor in deprecation; we simply didn't happen to get 
round to removing this extension until 3.4 though removal in 3.1 would 
have been reasonable.

http://gcc.gnu.org/gcc-3.0/caveats.html
http://gcc.gnu.org/gcc-3.4/changes.html



-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17026