https://bugs.llvm.org/show_bug.cgi?id=45549
Bug ID: 45549
Summary: std::type_index equality broken with
LIBCPP_HAS_MERGED_TYPEINFO_NAMES_DEFAULT=OFF
Product: libc++
Version: 9.0
Hardware: All
OS: All
Status: NEW
Severity: normal
Priority: P
Component: All Bugs
Assignee: unassignedclangb...@nondot.org
Reporter: ryan.br...@ableton.com
CC: llvm-bugs@lists.llvm.org, mclow.li...@gmail.com
When using LIBCXX_HAS_MERGED_TYPEINFO_NAMES_DEFAULT=OFF, distinct classes with
the same name, each in a different TU and anonymous namespace, are considered
equal by std::type_index.
LIBCXX_HAS_MERGED_TYPEINFO_NAMES_DEFAULT=OFF is used in the libc++ shipped with
Xcode as of Xcode 11.4. The bug does not occur in Xcode 11.3.1, the previous
version. LIBCXX_HAS_MERGED_TYPEINFO_NAMES_DEFAULT was introduced in 2405bd689
for LLVM 9.0.0.
See https://gist.github.com/ryb-ableton/1805b61e2d0976de4ba04c2aa2f5992b for a
minimal test case.
May be related to https://bugs.llvm.org/show_bug.cgi?id=34907
----------------
Steps to reproduce on Linux/x86:
1. Build and install libc++ 9.0 or 10.0 by passing
-DLIBCXX_HAS_MERGED_TYPEINFO_NAMES_DEFAULT=OFF to cmake
2. Download and extract a zip of the Gist linked above
3. Run "bash ./build_and_run"
Steps to reproduce on macOS:
1. Install and select Xcode 11.4, which uses
LIBCXX_HAS_MERGED_TYPEINFO_NAMES_DEFAULT=OFF by default
2. Download and extract a zip of the Gist linked above
3. Run "bash ./build_and_run"
Actual Output:
Assertion failed: (registry[0] != registry[1]), function main, file main.cpp,
line 13.
./run: line 4: 39942 Abort trap: 6 ./test
Failure
Expected Output:
Success
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