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Program compiled using FC6 g++ crash in FC5



I have two programs that when compiled under the latest version of g++:
gcc version 4.1.1 20061011 (Red Hat 4.1.1-30) work perfectly
under FC6 but give the error 'Floating point exception' when run under FC5. 
(The version of g++ in FC5 is 4.1.1 20060525 (Red Hat 4.1.1.-1) 

When one runs a gdb (in FC5) on either program you get:
(gdb) run
Starting program: prepdata
Reading symbols from shared object read from target memory...done.
Loaded system supplied DSO at 0x9c8000

Program received signal SIGFPE, Arithmetic exception.
0x00ad2396 in do_lookup_x () from /lib/ld-linux.so.2
(gdb) where
#0  0x00ad2396 in do_lookup_x () from /lib/ld-linux.so.2
#1  0x00ad2719 in _dl_lookup_symbol_x () from /lib/ld-linux.so.2
#2  0x00ad3eca in _dl_relocate_object () from /lib/ld-linux.so.2
#3  0x00acc840 in dl_main () from /lib/ld-linux.so.2
#4  0x00adc6f7 in _dl_sysdep_start () from /lib/ld-linux.so.2
#5  0x00aca2b6 in _dl_start () from /lib/ld-linux.so.2
#6  0x00ac9847 in _start () from /lib/ld-linux.so.2

which seems to be some type of load error, since the program
doesn't seem to have started yet.

When compiled under FC5 g++, the program also works properly.
The FC6 machine is an Intel Core 2 Duo, the FC5 machines have
Intel 950 (Dual core) chips and are running smp kernels.

Is this an incompatibility? - a bug?




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