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LLVM IR hello world

Example: llvm/hello.ll adapted from: llvm.org/docs/LangRef.html#module-structure but without double newline.

To execute it as mentioned at github.com/dfellis/llvm-hello-world we can either use their crazy assembly interpreter, tested on Ubuntu 22.10:

sudo apt install llvm-runtime
lli hello.ll

This seems to use puts from the C standard library.

Or we can Lower it to assembly of the local machine:

sudo apt install llvm
llc hello.ll

which produces:

hello.s

and then we can assemble link and run with gcc:

gcc -o hello.out hello.s -no-pie
./hello.out

or with clang:

clang -o hello.out hello.s -no-pie
./hello.out

hello.s uses the GNU GAS format, which clang is highly compatible with, so both should work in general.

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