llvm dev - Nov 2017 - PSA: debuginfo-tests workflow changing slightly

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.
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.

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.

Thanks!
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> 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
<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!
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
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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!
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>
>
>
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