This feature consists of 3 parts:

1. Parsing of the #pragma comment directive. I think we have that in clang.
2. Emitting a note in the object file. We don't do that currently.
3. Have the linker pick up the note and link the specified libs.

While we can implement #​2 in LLVM, #​3 is beyond its scope. We currently rely on the linker from binutils on windows and most unices. As far as I know it doesn't have the required feature. It's a bit of a chicken-and-egg problem, but it doesn't make much sense to implement only one side.

Could you talk to the binutils guys and see if they're willing to implement this?

Hi Olaf,

Do you want this support for Linux or Windows or both?

Eh, both. Or Linux. Currently I use MSVC on Windows, which already supported this. But ideally clang should support it on Windows too.

I'm looking at threading #pragma comment through to codegen. It's a lot like a stripped down ImportDecl: it basically gets passed through the backend and concatenated with linker options, with some changes on the way.

Is it work implementing something like #pragma clang linker_options "..." to implement this in terms of, and then thread that all the way through to the back, or would it be better to have a one off AST node just for #pragma comment?

Or is there some better way to move data all the way through Sema to CodeGen?

I added #pragma comment(lib)-style autolinking in r181426, but that doesn't fix this problem for everyone.

I'm going to close this. We have '#pragma comment lib' support in clang on Windows. Other platforms will have to wait.