| Issue |
124912
|
| Summary |
[TySan] Can't build LLVM; many reports from llvm::cl::opt
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
gbMattN
|
When building clang with TySan, there are many runtime errors of the form
```
==15386==ERROR: TypeSanitizer: type-aliasing-violation on address 0x64ca90a27e18 (pc 0x64ca900c2ff1 bp 0x7ffcdb1ca690 sp 0x7ffcdb1c9e38 tid 15386)
READ of size 8 at 0x64ca90a27e18 with type p1 omnipotent char (in std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > at offset 0) accesses part of an existing object of type llvm::cl::opt<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, false, llvm::cl::parser<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > that starts at offset -160
#0 0x64ca900c2ff0 in llvm::cl::opt<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>, false, llvm::cl::parser<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>>>::~opt() (/home/gbmatt/Documents/upstream/llvm-project/build/bin/clang-tblgen+0x42dff0
```
These are _probably_ false positives, so it would be good to understand them
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