| Issue |
159629
|
| Summary |
ASan run twice under fat lto
|
| Labels |
bug
|
| Assignees |
|
| Reporter |
PiJoules
|
Clang gives the following warning when compiling with ASan and fat LTO:
```
$ ~/llvm-projects/llvm-project-build-1/bin/clang++ -flto -ffat-lto-objects -c -fsanitize=address /tmp/test.cc
warning: Redundant instrumentation detected, with module flag: nosanitize_address [-Wbackend-plugin]
1 warning generated.
```
The warning indicates the pass is being run twice, perhaps one for the LTO'd bitcode and another for the normal IR that would be codegen'd. The warning doesn't appear if `-ffat-lto-objects` is omitted.
Functionally this doesn't affect ASan instrumentation since the pass will exit early if the module was already instrumented, but I wonder if perhaps this would affect other passes which don't do redundant checks.
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