Hi,

On Thu, Sep 23, 2021, at 07:57 CDT, "'develo...@googlemail.com' via deal.II 
User Group" <dealii@googlegroups.com> wrote:

> Hei,
> I did some testing now, with different compilers. I did not get a segfault 
> for GCC 11.2, but it segfaults with ICC 2021.3.0. I attached the 
> detailed.log-files for both deal.II-versions.

> Could the issue be that some libraries which have been compiled with
> GCC are linked into my executable, even when being compiled with ICC?

That shouldn't be an issue. The Intel compiler tries to be ABI compliant
with the GCC compiler, so it is perfectly fine to link against libraries
compiled with GCC - in fact, Intel is using the C++ standard library
(libstdc++) shipped by GCC.

But, would you mind quickly checking compilation and execution with ICC
again *without* the "-march=native -mavx2" that you have set somewhere
(CXXFLAGS?)? (After configure and before you can check 'detailed.log"
quickly whether the flags still show up in the line DEAL_II_CXX_FLAGS.)

We had issues with ICC miscompiling with "-march=native" in the past.

Best,
Matthias

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