Build fails when using enable sanitizers script

[borrrden]

Disclaimer: The reason I am trying to do this is so I can run an ASAN enabled native library that I heavily use with P/Invoke. However it seems if I don't compile coreclr with the same ASAN enabled the arguments from C# get turned into garbage on their way into C++. If this should not the case, then please inform me.

Building against the v2.1.0 tag

I'm running following the instructions I found here verbatim in an ubuntu:14.04 docker container. The build succeeds using build.sh debug skiptests clang3.9 but then when I run . enablesanitizers.sh asan clang3.9 the same build invocation fails with the following:

/usr/bin/ld: /usr/lib/llvm-3.9/bin/../lib/clang/3.9.1/lib/linux/libclang_rt.asan-x86_64.a(asan_allocator.cc.o): unrecognized relocation (0x2a) in section `.text'
/usr/bin/ld: final link failed: Bad value
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make[2]: *** [src/coreclr/hosts/unixcorerun/corerun] Error 1
make[1]: *** [src/coreclr/hosts/unixcorerun/CMakeFiles/corerun.dir/all] Error 2

(Similar error for coreconsole)

[borrrden]

Ubuntu 18 works so maybe Ubuntu 14's ld is too old.

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