[llvm-dev] How to link against specific targets? (Porting ShadowCallStack to new PM)

[Craig Topper via llvm-dev]

Isn't ShadowCallStack a MachineFunctionPass? Machine IR doesn't use the new
PM yet.

~Craig


On Tue, Jan 8, 2019 at 10:30 AM Leonard Chan via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> Hi all,
>
> I'm in the process of trying to port ShadowCallStack from the legacy
> pass manager to the new one. I ran into an issue though where it seems
> I cannot link against anything I added in ShadowCallStack.cpp when
> trying to build c-index-test (via just running ninja check-all). I
> think the reason for this is because nothing under lib/Target/X86/ is
> a part of any library compiled with c-index-test (if I'm reading the
> CMake correctly). I imagine this would also mean I wouldn't be able to
> successfully build other binaries like clang.
>
> What I want to know is if there is a proper way to link against code
> under lib/Target/X86/ (as a part of some shared library or through
> some other means) such that i could use it with the new pass manager.
>
> These are some other thoughts I had attempting to find a possible solution:
> - I could not find an instance of classes under lib/Target/X86/ (or
> any other target for that matter) that are used or exposed by anything
> outside of lib/Target/
> - The only things that seem exposed under lib/Target/ are a few files
> packed into libLLVMTarget.a and none of it is linked against source
> files under llvm/Target/<TARGET>
> - If ShadowCallStack is meant to be a pass that should eventually work
> for any target, at some point it could be pulled out from the X86
> directory and also be included in libLLVMTarget.a, but I'm not sure
> how the CMake dependency hierarchy would support this.
>
> Thanks,
> Leonard
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