How to build clang with the memtag sanitiser enabled

Question

I have spent a few hours trying to get the built-from-sources version of clang (v15) to work with the memtag sanitiser. For those of you who don't know what that is, it is simply a version of the address sanitiser that leverages the Memory Tagging features of ARM. Anyway, while I can use it normally with the repository version of clang (v10), using the version built from sources just does not work. Here is the command I use for both: clang main.c -S -march=armv8+memtag -fsanitize=memtag with clang which is either the repository-version or the built-from-sources version. Although the former works seamlessly, the latter does not.

I've tried to built llvm with different parameters, but none seemed to have done the trick. Here's my current building configuration: cmake -G Ninja -DCMAKE_BUILD_TYPE=Release -DLLVM_ENABLE_PROJECTS="clang;clang-tools-extra;lld;lldb;openmp;polly;pstl;compiler-rt" -DLLVM_TARGETS_TO_BUILD="AArch64" ../llvm

I wonder if there is some parameter I have to specify to build clang with this sanitiser enabled.

PS: using the -fsanitize=memtag flag does not give any error: with the built version of clang it simply does not insert the instrumentation code.

If anybody is able to give me some insight I would really appreciate it. Thanks ;)