Building with LLVM=1

[pitust]

How to do this?

[shinh]

I don't remember the exact step, but here's the branches:

https://github.com/shinh/elvm/tree/llvm
https://github.com/shinh/llvm/tree/elvm
https://github.com/shinh/clang/tree/elvm

It seems my copies of them were set up like:

elvm/llvm: the elvm branch of llvm
elvm/llvm/tools/clang: the elvm branch of clang
elvm/llvm-build: the build directory of llvm

To build the LLVM&clang for the ELVM target, you may perhaps need to set -DLLVM_EXPERIMENTAL_TARGETS_TO_BUILD=ELVM to cmake

If clang and llc is built, I think

elvm/Makefile

Line 238 in bb1c1a1

CMD = llvm-build/bin/clang -g -std=c99 -m32 -target elvm-unknown-linux-gnu -emit-llvm -S -include libc/_builtin.h -I. -Ilibc -Iout -o $1.tmp $2 && mv $1.tmp $1

and llc -march=elvm -asm-verbose should be able to produce eir.

[pitust]

Ok, I built llvm, but the output has weird call instructions that are (understandably) not parsed correctly.
But they are parsed in the llvm branch, except that i don't have a clang built along with my LLVM so i need to use my system one (which is clang 9) but the LLVM in your fork is LLVM 4, so there are syntax errors on dso_local, which i can just replace out and it builds.

[pitust]

why is is so confusing? call intructions aren't used in the normal thing, and for some backends, they don't even work. Fortunatly, for my use case, the only one i care about is the JS backend.

[pitust]

call and ret are just lowered? That is really confusing.

[pitust]

I may not have had backends enabled too.