ubsan doesn't work with clang 3.2

[arsenm2@…]

If you try to use ubsan with clang, it always fails:

$ /opt/local/bin/clang -fsanitize=undefined arst.c   
Undefined symbols for architecture x86_64:
  "___ubsan_handle_add_overflow", referenced from:
      _main in arst-nGlYc7.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

The fix is clang should build should use cmake instead of autotools since it's basically the preferred LLVM build system at this point.

​http://llvm.org/bugs/show_bug.cgi?id=14341

[mf2k (Frank Schima)]

In the future, please use WikiFormatting and Cc the port maintainer(s).

[jeremyhu (Jeremy Huddleston Sequoia)]

Moving from autotools to cmake as the build system is not exactly the fix. It might fix this as a side effect (I haven't tested), but in itself, that is not the fix. That being said, if you want to provide a patch to get us onto the new build system, I'd certainly appreciate it.

[jeremyhu (Jeremy Huddleston Sequoia)]

Use 3.3 and 3.4:

/opt/local/libexec/llvm-3.3/lib/clang/3.3/lib/darwin/libclang_rt.ubsan_osx.a
/opt/local/libexec/llvm-3.4/lib/clang/3.4/lib/darwin/libclang_rt.ubsan_osx.a