https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65285
--- Comment #9 from Peter Wu <peter at lekensteyn dot nl> --- Tested with clang version 3.7.0 (http://llvm.org/git/clang.git 6b7e300a9c14a2ff364d8ef8a0f7510378f38dbc) (http://llvm.org/git/llvm 258b7710d59c086656f7b26f02326d7ca69d71fd) (http://llvm.org/git/compiler-rt.git 70b3c4464a4067db2cd9862736611fdf6739f451) The output is still: AddressSanitizer can not describe address in more detail (wild memory access suspected). I can however live with the -fno-common workaround (which sounds like a good idea overall). I'll leave it up to you whether it will be closed as WONTFIX. Thanks for your hints!