In helping to debug https://trac.torproject.org/projects/tor/ticket/25386 I've found that a number of the link errors are attributable to the linker invocation on Travis. The recent `link_rust.sh` script is definitely necessary I think, except that I believe it needs a few tweaks: * The `-lasan` argument should be replaced with `-fsanitizer=address` I believe to ensure that the C compiler links all of its relevant libraries (as they may have different names and different numbers of libs on some platforms I think). * Second, the Rust compiler by default passes `-nodefaultlibs` to the linker which means that the linker script also passes this along. It looks, however, like this is incompatible with `-fsanitizer=address`, causing link errors. This argument should be safe to strip out though. The first bullet was easy enough to fix locally and the second bullet was fixable by changing `link_rust.sh` to a `bash` script and then using something like: ``` linker_args="$@" $CCLD @RUST_LINKER_OPTIONS@ ${linker_args//-nodefaultlibs/} ``` **Trac**: **Username**: alexcrichton