Per https://code.google.com/p/address-sanitizer/wiki/Flags one benefits from compiling with -fno-common when -fsanitize=address is active The attached patch converts the single common variable to a global/extern variable. Seems a good idea to me. Have run this with no issues, but more ASAN coverage is better than less.
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permit_gcc_fnocommon_4_asan.patch
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