Idiomatic Linking, Optimization, and Compilation of LLVM Bitcode (.bc) Files

[scienceplease]

I'm hoping to get pointed in the right direction for the most idiomatic way to link and compile LLVM bitcode (.bc) files generated by different compilers.

In a nutshell:

$ ispc --emit-llvm -o foo_ispc.bc foo.ispc
$ clang -O2 -c -emit-llvm -o foo_cpp.bc foo.cpp

$ llvm-link foo_ispc.bc foo_cpp.bc -o - | opt -O3 -o foo_opt.bc
$ llc -filetype=obj foo_opt.bc -o foo.o

The purpose is to facilitate inlining and cross-function optimizations in code compiled with Intel's ISPC compiler and vanilla clang.

I've found examples of defining a generator for ISPC, the gap in knowledge is how to best link/optimize/compile LLVM bitcode (.bc) files using LLVM's bitcode linker (llvm-link), optimizer (opt), and static compiler (llc). I cannot find any meson build scripts in the wild that achieve this.

I can see that assembler (.S) and LLVM IR (.ll) files are supported by library() and executable(), but cannot find references to LLVM bitcode in the docs nor the source.

Thank you!