GCC cross compiling issue

[Jin Zhang]

Hi There,

We are trying to compile gcc 8.3.0 in our new build system which have AVX512 feature.
The program itself compiled without any problem.
However, when I tried to run it on our old nodes (avx2), it get

"mpi-pingpong.c: In function ‘main’:
mpi-pingpong.c:20:4: internal compiler error: Illegal instruction
    double max_rate = 0.0, min_latency = 10e6;
    ^~~~~~
0xa782ef crash_signal
../../gcc/toplev.c:325
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions."

It works fine on our new avx512 nodes.
We tried set BOOT_CFLAGS, disable-bootstrap and set up CFLAGS, but none of them works.

Does anyone have experience on these, thanks?

Regards,

Jin Zhang