vitalybuka wrote:
The problem is that some of check_cxx_source_compiles invocation does:
```
cat t.cpp
int main() {
}
/usr/local/google/home/vitalybuka/tmp/bot/llvm_build0/bin/clang++
-fsanitize=memory -nostdlib++ -nostdinc++ -fuse-ld=lld t.cpp
>> referenced by ubsan_type_hash_itanium.cpp:245
>> (/usr/local/google/home/vitalybuka/tmp/bot/llvm-project/compiler-rt/lib/ubsan/ubsan_type_hash_itanium.cpp:245)
>>>
>>> ubsan_type_hash_itanium.cpp.o:(__ubsan::checkDynamicType(void*, void*,
>>> unsigned long)) in archive
>>> /usr/local/google/home/vitalybuka/tmp/bot/llvm_build0/lib/clang/20/lib/x86_64-unknown-linux-gnu/libclang_rt.msan_cxx.a
ld.lld: error: undefined symbol: typeinfo for __cxxabiv1::__class_type_info
>>> referenced by ubsan_type_hash_itanium.cpp:245
>>> (/usr/local/google/home/vitalybuka/tmp/bot/llvm-project/compiler-rt/lib/ubsan/ubsan_type_hash_itanium.cpp:245)
>>>
>>> ubsan_type_hash_itanium.cpp.o:(__ubsan::checkDynamicType(void*, void*,
>>> unsigned long)) in archive
>>> /usr/local/google/home/vitalybuka/tmp/bot/llvm_build0/lib/clang/20/lib/x86_64-unknown-linux-gnu/libclang_rt.msan_cxx.a
>>> referenced by ubsan_type_hash_itanium.cpp:0
>>> (/usr/local/google/home/vitalybuka/tmp/bot/llvm-project/compiler-rt/lib/ubsan/ubsan_type_hash_itanium.cpp:0)
>>>
>>> ubsan_type_hash_itanium.cpp.o:(isDerivedFromAtOffset(__cxxabiv1::__class_type_info
>>> const*, __cxxabiv1::__class_type_info const*, long)) in archive
>>> /usr/local/google/home/vitalybuka/tmp/bot/llvm_build0/lib/clang/20/lib/x86_64-unknown-linux-gnu/libclang_rt.msan_cxx.a
>>> referenced by ubsan_type_hash_itanium.cpp:141
>>> (/usr/local/google/home/vitalybuka/tmp/bot/llvm-project/compiler-rt/lib/ubsan/ubsan_type_hash_itanium.cpp:141)
>>>
>>> ubsan_type_hash_itanium.cpp.o:(isDerivedFromAtOffset(__cxxabiv1::__class_type_info
>>> const*, __cxxabiv1::__class_type_info const*, long)) in archive
>>> /usr/local/google/home/vitalybuka/tmp/bot/llvm_build0/lib/clang/20/lib/x86_64-unknown-linux-gnu/libclang_rt.msan_cxx.a
>>> referenced 2 more times
and so on
```
So -nostdlib++ removes libc++ but does not remove msan_cxx.a.
My guess we need to fix the driver to do so.
https://github.com/llvm/llvm-project/pull/108357
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