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# 49532137 22-Jan-2020 Nico Weber <thakis@chromium.org>

Make AST reading work better with LLVM_APPEND_VC_REV=NO

With LLVM_APPEND_VC_REV=NO, Modules/merge-lifetime-extended-temporary.cpp
would fail if it ran before a0f50d731639350c7a7 (which changed
the s

Make AST reading work better with LLVM_APPEND_VC_REV=NO

With LLVM_APPEND_VC_REV=NO, Modules/merge-lifetime-extended-temporary.cpp
would fail if it ran before a0f50d731639350c7a7 (which changed
the serialization format) and then after, for these reasons:

1. With LLVM_APPEND_VC_REV=NO, the module hash before and after the
change was the same.

2. Modules/merge-lifetime-extended-temporary.cpp is the only test
we have that uses -fmodule-cache-path=%t that
a) actually writes to the cache path
b) doesn't do `rm -rf %t` at the top of the test

So the old run would write a module file, and then the new run would
try to load it, but the serialized format changed.

Do several things to fix this:

1. Include clang::serialization::VERSION_MAJOR/VERSION_MINOR in
the module hash, so that when the AST format changes (...and
we remember to bump these), we use a different module cache dir.
2. Bump VERSION_MAJOR, since a0f50d731639350c7a7 changed the
on-disk format in a way that a gch file written before that change
can't be read after that change.
3. Add `rm -rf %t` to all tests that pass -fmodule-cache-path=%t.
This is unnecessary from a correctness PoV after 1 and 2,
but makes it so that we don't amass many cache dirs over time.
(Arguably, it also makes it so that the test suite doesn't catch
when we change the serialization format but don't bump
clang::serialization::VERSION_MAJOR/VERSION_MINOR; oh well.)

Differential Revision: https://reviews.llvm.org/D73202

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# d8132c30 29-Aug-2017 Raphael Isemann <teemperor@gmail.com>

[modules] Add test for using declaration in classes.

Summary:
This adds a test that checks if the using declaration in classes still works as intended with modules.

The motivation for this is that

[modules] Add test for using declaration in classes.

Summary:
This adds a test that checks if the using declaration in classes still works as intended with modules.

The motivation for this is that we tried to add a shortcut to `removeDecl` that would skip the removal of declarations from the lookup table if they are hidden. This optimization passed the clang test suite but actually broke the using declaration in combination with -fmodules-local-submodule-visibility. In this mode we hide all decls from other modules such as by chance the parent method, in which case don't remove the parent method from the lookup table and get ambiguous lookup errors. After this patch we now correctly see if this behavior is broken by a patch like this in the test suite.

Reviewers: v.g.vassilev

Reviewed By: v.g.vassilev

Subscribers: cfe-commits

Differential Revision: https://reviews.llvm.org/D37180

llvm-svn: 311991

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