-ll flag prints to stderr

[nickdesaulniers]

is this intentional? I expected it to compile hello_word.cr to llvm IR and output hello_world.ll, not compile to binary and print the IR to stderr.

[asterite]

We are using this function provided by llvm: http://llvm.org/docs/doxygen/html/group__LLVMCCoreModule.html#ga31c87315ba3f595d6786c47a50d9f8e7

Do you know if there is a similar function to get the dump as a string? That's why we just dump it to stderr, because that is what llvm provides. If you could get a string representation we would dump it to stdout.

[nickdesaulniers]

If the compiler is passed the -ll flag, can you check that compilation was valid, then redirect stderr to a new file? That way you wouldn't miss any compilation errors being printed to stderr as expected. I don't really know much about LLVM APIs.

[nickdesaulniers]

Tracing through how we do it in rust:

1. get the command line flag, passed as sess.opts.output_type
2. call into llvm module
3. which is a Rust binding
4. to a C wrapper
5. which is what we call in LLVM

createPrintModulePass

Let me know if this helps!

[asterite]

Hi Nick,

Let me know if this fixes the issue. Thanks for pushing this forward :-)