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Showing content from https://github.com/ziglang/zig/issues/16269 below:

When the compiler is built without LLVM, use Aro to compile C code instead of Clang · Issue #16269 · ziglang/zig · GitHub

After solving #16268 which is a prerequisite to this issue, this issue is to further reduce dependency on Clang by using Aro to compile .c files.

I suggest, at least at first, this happens by taking advantage of translate-c, and then passing the outputted .zig code through the full pipeline. I experimented a bit with upstreaming Aro in #10795 in which I attempted to lower C AST to AIR, and this was my conclusion:

I'm starting to wonder... should we perhaps lower to ZIR instead of AIR? The integration would be a lot less messy, and it's much more obvious how to parallelize it. One .c file would produce exactly one corresponding ZIR file. 🤔🤔🤔

So the two options I think are worth exploring:

1. C code => Aro C AST => Translate C AST => zig source code
2. From there, potentially give an additional lowering to Translate C AST:
   • => zig source code
   • => ZIR

Another possibility would be straight from Aro C AST to ZIR. There could be additional C-specific ZIR instructions added if necessary.

krk, lin72h, easbarba, jinzhongjia, crispy-strawberry and 2 moreianprime0509, lin72h, BratishkaErik and crispy-strawberrycandrewlee14

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