Improve the cmake flag configuration

[mithro]

The cmake file needs some improvement.

It should add;

• Add -Wimplicit-fallthrough=0 if it is supported on non-Windows
• Add -Wno-attributes if it is supported on non-Windows
• Add /std:c++latest on Windows.

This is related to #50.

Originally posted by @mithro in https://github.com/SymbiFlow/fasm/pull/48#r570760958

[mithro]

Notes from @litghost ;

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https://github.com/SymbiFlow/fasm/pull/48/files#r571089908

https://docs.microsoft.com/en-us/cpp/build/reference/compiler-options?view=msvc-160

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https://github.com/SymbiFlow/fasm/pull/48/files#r571092177

https://en.cppreference.com/w/cpp/language/attributes/fallthrough

If ANTLR could emit [[fallthrough]], -Wimplicit-fallthrough=0 is not required.

---

https://github.com/SymbiFlow/fasm/pull/48/files#r571093017

PIC support might be possible via: https://cmake.org/cmake/help/v3.0/prop_tgt/POSITION_INDEPENDENT_CODE.html

https://cmake.org/cmake/help/latest/module/CheckPIESupported.html#module:CheckPIESupported

---

https://github.com/SymbiFlow/fasm/pull/48/files#r571097079

CMake has explicit C++ standard select support: https://cmake.org/cmake/help/latest/prop_tgt/CXX_STANDARD.html

GitHub

WIP: Add GitHub Actions which publish to PyPI by mithro · Pull Request #48 · SymbiFlow/fasm

This pull request will add a GitHub Action which builds the fasm packages, including binary wheels for Linux, Mac and Windows and then upload them to PyPI. WIP -- TODO;

Have auto-incrementing ver...

MSVC Compiler Options

Learn more about: Compiler Options

GitHub

WIP: Add GitHub Actions which publish to PyPI by mithro · Pull Request #48 · SymbiFlow/fasm

This pull request will add a GitHub Action which builds the fasm packages, including binary wheels for Linux, Mac and Windows and then upload them to PyPI. WIP -- TODO;

Have auto-incrementing ver...

C++ attribute: fallthrough (since C++17) - cppreference.com

GitHub

WIP: Add GitHub Actions which publish to PyPI by mithro · Pull Request #48 · SymbiFlow/fasm

This pull request will add a GitHub Action which builds the fasm packages, including binary wheels for Linux, Mac and Windows and then upload them to PyPI. WIP -- TODO;

Have auto-incrementing ver...

POSITION_INDEPENDENT_CODE — CMake 3.0.2 Documentation

CheckPIESupported — CMake 3.19.5 Documentation

GitHub

WIP: Add GitHub Actions which publish to PyPI by mithro · Pull Request #48 · SymbiFlow/fasm

This pull request will add a GitHub Action which builds the fasm packages, including binary wheels for Linux, Mac and Windows and then upload them to PyPI. WIP -- TODO;

Have auto-incrementing ver...

CXX_STANDARD — CMake 3.19.5 Documentation