Unable to build a cpp program on AIX with gcc fsanitize address

I'm trying to build a cpp program on AIX 7.2 using gcc with address sanitizer (-fsanitize=address) but this errors out with:

cc1plus: warning: '-fsanitize=address' not supported for this target
collect2: fatal error: library libasan not found
compilation terminated.

I thought maybe the compilation will succeed if I have the libasan shared library. So I tried building llvm from source but running into the same issue with that:

> export CC=gcc; export CXX=g++;
> cmake -DLLVM_ENABLE_PROJECTS=clang -DLLVM_ENABLE_RUNTIMES=compiler-rt -DCMAKE_INSTALL_PREFIX=/llvm_install -DLLVM_USE_SANITIZER=Address -DCMAKE_BUILD_TYPE=Debug -DLLVM_TARGETS_TO_BUILD="PowerPC" -G "Unix Makefiles" /llvm-project/llvm
Consolidate compiler generated dependencies of target LLVMDemangle
[  0%] Building CXX object lib/Demangle/CMakeFiles/LLVMDemangle.dir/Demangle.cpp.o
cc1plus: error: '-fsanitize=address' not supported for this target [-Werror]
cc1plus: all warnings being treated as errors

My environment:

gcc version 10.3.0
cmake version 3.20.0
AIX 7.2

**Questions:** 1. Does gcc not support fsanitize=address on AIX? 2. Has someone successfully built a cpp program with address sanitizer on AIX? If so, can you please share the steps. 3. Do I need to use xlc ? Is there no way to make this work with gcc? Apologies if this it not the right forum to ask AIX queries.