[llvm-dev] PSA: debuginfo-tests workflow changing slightly

Zachary Turner via llvm-dev llvm-dev at lists.llvm.org
Fri Nov 3 18:09:43 PDT 2017

llvm-profdata is part of llvm though. It’s perfectly fine for something in
clang to depend on something in llvm. However, clang and lld are two
independent llvm subprojects, neither of which can depend on each other.

Generally speaking, from a layering perspective, if A depends on B and C,
but B and C are independent, that should be reflected in the structure.

For example, in CMake we will need to find out if lld is being built, since
it is optional. We would not be able to do this from inside of the clang
tree, without requiring the parent cmake (e.g. llvm) to make sure that we
traversed into lld’s cmake first. This is a clear layering violation
though. Instead, the proper way to do it is have llvm include both, and the
run the debuginfo-tests cmake configuration
On Fri, Nov 3, 2017 at 6:00 PM Vedant Kumar <vsk at apple.com> wrote:

> On Nov 3, 2017, at 3:21 PM, Zachary Turner via llvm-dev <
> llvm-dev at lists.llvm.org> wrote:
> Greetings,
> If you dont' care about running debuginfo-tests, and don't maintain a bot
> that runs debuginfo-tests, you can stop reading.
> I've uploaded a patch [https://reviews.llvm.org/D39605] that changes the
> way you run debuginfo-tests.
> Prior to this patch, the way to run them is to clone an external git
> repository into clang/test and then debuginfo-tests will happen
> transparently when you run "ninja check-clang".
> After this patch, there will be two workflows depending on if you use
> multi-repo or mono-repo.
> multi-repo: You will need to clone debuginfo-tests into llvm/projects,
> then run "ninja check-debuginfo"
> mono-repo: pass -DLLVM_ENABLE_PROJECTS="debuginfo-tests", then run "ninja
> check-debuginfo"
> The motivation for this change is that planned additions to
> debuginfo-tests require us to be able to make use of lld, and as a result
> the tests need to live somewhere that can access both clang and lld, not
> just clang.
> I'm not at all opposed to this effort, but I do wonder why this is part of
> the motivation. Tests in clang/test should be able to use any binary in
> <build-dir>/bin, right? E.g we use <build-dir>/bin/llvm-profdata for the
> tests in clang/test/Profile.
> Furthermore, giving them their own target "check-debuginfo" as opposed to
> being transparently added to check-clang makes more sense from a usability
> perspective.  Finally, this new approach is mono-repo friendly whereas the
> previous one was not.
> Yep.
> I'm hoping this won't be too disturbing of a change, but please leave
> comments and issues on this thread or on the code rview.
> We have several bots which clone debuginfo-tests to tools/clang/test, but
> it shouldn't be too much of a hassle to migrate them. I've CC'd Mike and
> Chris as a heads-up (or in case they have anything to add :).
> thanks,
> vedant
> Thanks!
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