https://bugs.llvm.org/show_bug.cgi?id=52454
Bug ID: 52454
Summary: ADL broken with clang 13.0.0
Product: clang
Version: 13.0
Hardware: PC
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: C++
Assignee: unassignedclangb...@nondot.org
Reporter: dodoentertainm...@gmail.com
CC: blitzrak...@gmail.com, dgre...@apple.com,
erik.pilking...@gmail.com, llvm-bugs@lists.llvm.org,
richard-l...@metafoo.co.uk
Here is the Godbolt link that reproduces the issue that I've stumbled upon in
my codebase: https://godbolt.org/z/ocMdcxj89
Namely, the code uses ADL to inject a custom implementation of swap for the
boost iterator_facade (the swap is needed for `std::sort` to work).
This works great on GCC and MSVC and worked also on clang until v13.0.0 when it
stopped working.
You can see the error in the above Godbolt link.
Interestingly, if I replace `std::sort` with `boost::sort::pdqsort`, the same
implementation of swap can now be found using ADL.
You can see this in this example: https://godbolt.org/z/r8eMbY5r4
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