g++4.0 ICE on attribute cast
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Message-Id: <E1FgSGi-0003zI-00@skywise>
Sender: Thomas Richter <thor@skywise>
Date: Wed, 17 May 2006 22:05:17 +0200
>Submitter-Id: net
>Originator: Thomas Richter
>Organization:
>Confidential: no
>Synopsis: ICE on attribute cast
>Severity: serious
>Priority: low
>Category: c++
>Class: ice-on-legal-code
>Release: 4.0.3 (Debian 4.0.3-1) (Debian testing/unstable)
>Environment:
System: Linux skywise 2.4.32 #1 Sat Dec 17 20:57:41 CET 2005 i686 GNU/Linux
Architecture: i686
host: i486-pc-linux-gnu
build: i486-pc-linux-gnu
target: i486-pc-linux-gnu
configured with: ../src/configure -v
--enable-languages=c,c++,java,f95,objc,ada,treelang --prefix=/usr
--enable-shared -
-with-system-zlib --libexecdir=/usr/lib --without-included-gettext
--enable-threads=posix --enable-nls --program-suffix=
-4.0 --enable-__cxa_atexit --enable-clocale=gnu --enable-libstdcxx-debug
--enable-java-awt=gtk-default --enable-gtk-cair
o --with-java-home=/usr/lib/jvm/java-1.4.2-gcj-4.0-1.4.2.0/jre
--enable-mpfr --disable-werror --with-tune=i686 --enable-
checking=release i486-linux-gnu
>Description:
Casting an alias attribute to a variable before performing a
reinterpret_cast causes an ICE.
>How-To-Repeat:
Enter the following program:
int main(int argc,char **argv)
{
float x = 0.9;
long y = reinterpret_cast<long &>(static_cast<float
&__attribute((may_alias))> x);
return y;
}
Compile with -O3 -Wall
>Fix:
Introduce an intermediate variable, then cast
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