[Bug c++/32697] New: O2 optimizes away assignment

2007-07-09 Thread Dries dot Decock at excentis dot com 
Hi,

I'm using SWIG to combine Java and C++ code. At some point, SWIG generates a
method like this :

1SWIGEXPORT jlong JNICALL Java_com_excentis_products_X_XUpcast(JNIEnv *jenv,
jclass jcls, jlong jarg1) {
jlong baseptr = 0;
(void)jenv;
(void)jcls;
*(Flow **)&baseptr = *(TcpFlow **)&jarg1;
return baseptr;
}

The problem is that the assignment is not executed and the return value is
always zero, when using -O2 optimization. When I disable O2, or add a debug
statement, the value is ok.

I don't like the generated code, but it should work fine.


-- 
   Summary: O2 optimizes away assignment
   Product: gcc
   Version: 4.1.2
Status: UNCONFIRMED
  Severity: major
  Priority: P3
 Component: c++
AssignedTo: unassigned at gcc dot gnu dot org
    ReportedBy: Dries dot Decock at excentis dot com
 GCC build triplet: i686-pc-linux
  GCC host triplet: i686-pc-linux
GCC target triplet: i686-pc-linux i686-mingw32


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32697

[Bug c++/32700] New: O2 optimizes away assignment

2007-07-09 Thread Dries dot Decock at excentis dot com 
Hi,

I'm using SWIG to combine Java and C++ code. At some point, SWIG generates a
method like this :

1SWIGEXPORT jlong JNICALL Java_com_excentis_products_X_XUpcast(JNIEnv *jenv,
jclass jcls, jlong jarg1) {
jlong baseptr = 0;
(void)jenv;
(void)jcls;
*(Flow **)&baseptr = *(TcpFlow **)&jarg1;
return baseptr;
}

The problem is that the assignment is not executed and the return value is
always zero, when using -O2 optimization. When I disable O2, or add a debug
statement, the value is ok.

I don't like the generated code, but it should work fine.


-- 
   Summary: O2 optimizes away assignment
   Product: gcc
   Version: 4.1.2
Status: UNCONFIRMED
  Severity: major
  Priority: P3
 Component: c++
AssignedTo: unassigned at gcc dot gnu dot org
    ReportedBy: Dries dot Decock at excentis dot com
 GCC build triplet: i686-pc-linux
  GCC host triplet: i686-pc-linux
GCC target triplet: i686-pc-linux i686-mingw32


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32700

[Bug c++/32700] O2 optimizes away assignment

2007-07-09 Thread Dries dot Decock at excentis dot com 


--- Comment #1 from Dries dot Decock at excentis dot com  2007-07-09 14:06 
---
Sorry, dup


-- 

Dries dot Decock at excentis dot com changed:

   What|Removed |Added

 Status|UNCONFIRMED |RESOLVED
 Resolution||INVALID


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32700

[Bug c++/32697] O2 optimizes away assignment

2007-07-09 Thread Dries dot Decock at excentis dot com 


--- Comment #3 from Dries dot Decock at excentis dot com  2007-07-09 14:07 
---
Thanks for the reply. 

I will use the -fno-strict-aliasing for now, and hope that the SWIG maintainers
will fix this problem in the near future.

Thanks again.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32697