linker flags concatenation

I have such line in qbs for macos target:

cpp.linkerFlags: base.concat(project.profiling ? ["-pg"] : []).concat(project.sanitize ? ["-fsanitize=address"] : [])

with the profiling=false and sanitize=true I got next linking command:

/usr/bin/clang++ -Wl,-install_name,my.dylib,-headerpad_max_install_names,-arch,x86_64,-macosx_version_min,10.11,-fsanitize=address -dynamiclib -stdlib=libc++ ...

and linker says: 'unknown option: -fsanitize=address'

The problem in appending -fsanitize=address via comma. When I change the comma to the space and run in console linker is able to link.