How do I get line numbers in the debug output with clang's -fsanitize=address?

Question

I am trying to debug a memory error detected by clang with asan, but missed by valgrind. But I cannot get my clang built bina

Answer 1

Sometimes using a symbolizer with a version number will give the error:

ERROR: External symbolizer path is set to '/usr/bin/llvm-symbolizer-5.0' which isn't a known symbolizer. Please set the path to the llvm-symbolizer binary or other known tool.

This can be fixed by pointing to an unadorned llvm-symbolizer binary:

export ASAN_SYMBOLIZER_PATH=/usr/lib/llvm-5.0/bin/llvm-symbolizer

Then ran your executable as you normally would.