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c++/3620: GCC3.0 optimization on anonymous union causes ICE
- To: gcc-gnats at gcc dot gnu dot org
- Subject: c++/3620: GCC3.0 optimization on anonymous union causes ICE
- From: MAKINO Takaki <mak at is dot s dot u-tokyo dot ac dot jp>
- Date: Mon, 09 Jul 2001 22:20:47 +0900
- Cc: mak at is dot s dot u-tokyo dot ac dot jp
>Number: 3620
>Category: c++
>Synopsis: GCC3.0 optimization on anonymous union causes ICE
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: unassigned
>State: open
>Class: ice-on-legal-code
>Submitter-Id: net
>Arrival-Date: Mon Jul 09 06:26:00 PDT 2001
>Closed-Date:
>Last-Modified:
>Originator: Makino Takaki
>Release: 3.0
>Organization:
Tokyo Univ.
>Environment:
System: Linux tetley.is.s.u-tokyo.ac.jp 2.2.16-22enterprise #1 SMP Tue Aug 22 16:29:32 EDT 2000 i686 unknown
Architecture: i686
host: i686-pc-linux-gnu
build: i686-pc-linux-gnu
target: i686-pc-linux-gnu
configured with: ../configure --prefix=/home/users/mak/local/Linux-i686
>Description:
ICE occurs with the following code and -O option:
--------------------------------------test.cpp
void something(char *);
int main()
{
union {
char d[sizeof(int)];
int ll;
};
something(d);
return ll;
}
-----------------------------------------------
mak@tetley% gcc -v
Reading specs from /home/users/mak/local/Linux-i686/lib/gcc-lib/i686-pc-linux-gnu/3.0/specs
Configured with: ../configure --prefix=/home/users/mak/local/Linux-i686
Thread model: single
gcc version 3.0
mak@tetley% g++ -O hoge.cpp
hoge.cpp: In function `int main()':
hoge.cpp:12: Internal compiler error in elimination_effects, at reload1.c:2687
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://www.gnu.org/software/gcc/bugs.html> for instructions.
>How-To-Repeat:
See description.
>Fix:
Work around is to give a name to the union.
int main()
{
union {
char d[sizeof(int)];
int ll;
} some_name;
something(some_name.d);
return some_name.ll;
}
--
MAKINO Takaki <mak@is.s.u-tokyo.ac.jp>
>Release-Note:
>Audit-Trail:
>Unformatted: