“undefined reference” errors when trying to use address sanitizer with GCC

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You need to add -fsanitize=address to compiler flags (both CFLAGS and CXXFLAGS) and linker flags (LDFLAGS). You’ve probably added it to your compiler flags only.

Note that using explicit -lasan option has been widely discouraged by ASan developers (e.g. here) as it misses some other important linker flags. The only recommended way to link is to use -fsanitize=address.

As a side note, for more aggressive verification flags check Asan FAQ (look for “more aggressive diagnostics”).

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