Mac M1 C 20 Missing std convertible to and std forward iterator concepts

Question

I'm trying to build a rather large school project on a Mac M1, however I'm having trouble with several missing concepts.

The project was not designed with arm compilation in mind, but I'm looking into it to see whether it's doable.

The first stage was completed successfully: the configure script ran as expected and generated a Makefile.

The issue manifests itself during the compilation of some project files: clang appears to be missing several standard library ideas (c++20).

std::convertible to and std::forward iterator are two ideas that I'm missing.

After doing some investigation, I discovered that the apple version of clang for M1 processors does not completely implement all of the c++20 capabilities, which I believe is the source of my difficulty.

Is there another compiler for the AArch64 platform that incorporates more recent C++ capabilities, or should I give up now?

Answer 1

Clang from Homebrew is a good option (or compile one by yourself). 

You may also look at the features that have been incorporated on Clang's official website.

❯ clang++ --version
Homebrew clang version 13.0.0
Target: arm64-apple-darwin21.1.0
Thread model: posix
InstalledDir: /opt/homebrew/opt/llvm/bin

❯ cat test.cpp
#include <concepts>
#include <iterator>
static_assert(std::convertible_to<char, int>);
static_assert(std::forward_iterator<char*>);

❯ clang++ -std=c++20 -c test.cpp

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