[C++ TB code] Upgrade C++ standard used. Clean up Makefile layout. (!1235) · Merge requests · OpenHW Group / backup-20241120 / cva6

Eclipse Webmaster requested to merge github/fork/zchamski/pr/upgrade-cxx-standard into master May 16, 2023

Created by: zchamski

This PR uniformizes the handling of command line options that select the C++ standard used for compiling C++ code of the testbench. With the upcoming upgrade of Spike (vendorization + update to latest upstream), the systematic use of C++ 2017 standard throughout the CVA6 project becomes mandatory.

Makefile (CFLAGS): Use C++ 2017 standard. Fix whitespace.
(src): Fix whitespace.
($(dpi-library)/%.o): Do not add another (potentially conflicting) C++ standard option.
ariane.core (verilator_options): Use C++ 2017 standard.

[C++ TB code] Upgrade C++ standard used. Clean up Makefile layout.

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