From mboxrd@z Thu Jan  1 00:00:00 1970
From: gcc-bug@vogtner.de
To: gcc-gnats@gcc.gnu.org
Subject: c++/2613: incorrect code if -fsjlj-exceptions and exception specification on member function
Date: Sun, 22 Apr 2001 12:36:00 -0000
Message-id: <20010422192656.11154.qmail@sourceware.cygnus.com>
X-SW-Source: 2001-04/msg00424.html
List-Id: <gcc-prs.sourceware.org>

>Number:         2613
>Category:       c++
>Synopsis:       incorrect code if -fsjlj-exceptions and exception specification on member function
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          wrong-code
>Submitter-Id:   net
>Arrival-Date:   Sun Apr 22 12:36:00 PDT 2001
>Closed-Date:
>Last-Modified:
>Originator:     Stefan Vogtner
>Release:        gcc version 2.95.3 20010315 (release)
>Organization:
>Environment:
Linux client0 2.2.13 #11 Son Jan 21 17:58:52 CET 2001 i686 unknown 
and
SunOS 5.6 sun4u sparc SUNW,Ultra-5_10
>Description:
If the compiler/libstd++ is built with -fsjlj-exceptions
exceptions from class members are not correctly handled.
if the member function has an exception specification.
(find details in file "summary").
Depending on the optimization level the member function
is called twice and/or exceptions are uncaught and/or
process terminates due tue UNIX signals.
>How-To-Repeat:
configure:
 
../$GCCDIR/configure \
--prefix=$LOCAL \
--enable-shared \
--enable-threads \
--enable-version-specific-runtime-libs \
--enable-languages=c,c++
 
and make with
 
export CFLAGS='-fasynchronous-exceptions -fsjlj-exceptions'
export CXXFLAGS='-fasynchronous-exceptions -fsjlj-exceptions'
export LIBCFLAGS='-fasynchronous-exceptions -fsjlj-exceptions'
export LIBCXXFLAGS='-fasynchronous-exceptions -fsjlj-exceptions'
make CFLAGS='-fasynchronous-exceptions -fsjlj-exceptions' CXXFLAGS='-fasynchronous-exceptions -fsjlj-exceptions' LIBCFLAGS='-fasynchronous-exceptions -fsjlj-exceptions' LIBCXXFLAGS='-fasynchronous-exceptions -fsjlj-exceptions' bootstrap

After the installation (and setting the PATH and LD_LIBRARY_PATH)
I added
 
*cc1plus:
-fasynchronous-exceptions -fsjlj-exceptions
 
to the specs file. The enclosed gcc-bug-2001-04-16.cc
does now show strange behavior depending on compiler
version, exception-specification and optimization level.
Static linking yields same result. If the exception
specification is left out, everything works fine.
 
The result are summarized in the following table:
 
        +-------------+------------+
        | GCC         | GCC        |
        | 2.95.2      | 2.95.3     |
+-------+-------------+------------+
| -O0   | UA          | -          |
+-------+-------------+------------+
| -O1   | CUS         | CUS        |
+-------+-------------+------------+
| -O2   | C           | C          |
+-------+-------------+------------+
| -O3   | C           | C          |
+-------+-------------+------------+
 
C: ctor is called twice
U: integer exception is uncaught
A: SIGABRT
S: SIGSEGV
-: works as excepted
 
Results of the current gcc 3.0 snapshot could not be optained
since I could not get the compiler/libs built with -fsjlj-exception.  
>Fix:

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