-O3 triggers undefined reference to `_ITM_WM256'

[pramalhe]

Hi,
Is the -O3 compilation flag supported for building examples and user programs with Mnemosyne?
On g++-7.2 when I turn on -O3 I get this compilation error:
undefined reference to `_ITM_WM256'

-O0 works fine.

[hvolos]

hmm, when we originally developed the Mnemosyne TM runtime for the Intel Compiler, I don't recall whether the compiler ABI defined this method (_ITM_WM256). Looks like the ABI has been extended to include barriers for 256bit word sizes.

[snalli]

I have not seen this method before.

[hvolos]

Commit 0aba646 adds support for AVX 256-bit type __m256