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Part of #19063. Primarily, this moves Aro from deps/ to lib/compiler/ so that it can be lazily compiled from source. src/aro_translate_c.zig is moved to lib/compiler/aro_translate_c.zig and some of Zig CLI logic moved to a main() function there. aro_translate_c.zig becomes the "common" import for clang-based translate-c. Not all of the compiler was able to be detangled from Aro, however, so it still, for now, remains being compiled with the main compiler sources due to the clang-based translate-c depending on it. Once aro-based translate-c achieves feature parity with the clang-based translate-c implementation, the clang-based one can be removed from Zig. Aro made it unnecessarily difficult to depend on with these .def files and all these Zig module requirements. I looked at the .def files and made these observations: - The canonical source is llvm .def files. - Therefore there is an update process to sync with llvm that involves regenerating the .def files in Aro. - Therefore you might as well just regenerate the .zig files directly and check those into Aro. - Also with a small amount of tinkering, the file size on disk of these generated .zig files can be made many times smaller, without compromising type safety in the usage of the data. This would make things much easier on Zig as downstream project, particularly we could remove those pesky stubs when bootstrapping. I have gone ahead with these changes since they unblock me and I will have a chat with Vexu to see what he thinks.
Aro
A C compiler with the goal of providing fast compilation and low memory usage with good diagnostics.
Aro is included as an alternative C frontend in the Zig compiler
for translate-c and eventually compiling C files by translating them to Zig first.
Aro is developed in https://github.com/Vexu/arocc and the Zig dependency is
updated from there when needed.
Currently most of standard C is supported up to C23 and as are many of the common extensions from GNU, MSVC, and Clang
Basic code generation is supported for x86-64 linux and can produce a valid hello world:
$ cat hello.c
extern int printf(const char *restrict fmt, ...);
int main(void) {
printf("Hello, world!\n");
return 0;
}
$ zig build run -- hello.c -o hello
$ ./hello
Hello, world!
$