document inconsistant?

[Min Xu]

peeterj@ca.ibm.com wrote:

> Hi Min,
>
> Bus error on Sun (HP, SGI, ...) typically indicates an unaligned variable
> access (at least in the instances where I have seen this problem).  A
> comparison was done for you on AIX, but if the bus error was alignment
> related you won't hit it on AIX as AIX will handle alignment without
> raising an exception (it is still slower).  In the debugger see if the
> address of one of the double variables in the trapping comparison isn't a
> multiple of 8 (== sizeof(double), the required double alignment).
>
> The interesting thing here is that you don't have any dynamically allocated
> memory that I can see (nothing where you could potentially mess up the data
> alignment), so if the double is unaligned it is possibly compiler related.
> However, I notice one glaring cause of potential trouble -- you are
> compiling and linking C++ code with the c front end instead of using the
> C++ compiler (g++).  You should never have to do stuff like -lstdc++.  I
> suspect that if you compile this properly your problem will go away.
>
> Peeter

Hi Peeter,
  I am very glad to hear your insight opinion on this problem. Now I
have a more clear picture about bus error problem. I think you pointed
out a good point on my bad habbit, ;-). Previous I just feel using g++
is strange because of "++" should not be normal file name.
  Unfortunately, our system admin already recompile the gcc without
default options for UltraSPARC, so I can't verify if this problem can
go away if I use g++ to compile my program. However, from now on,
I will always use g++ to compile my c++ code, instead of gcc.

Regards,
Min