[cfe-users] Address Sanitizer Link Error

Jeffrey Walton noloader at gmail.com
Tue May 6 03:23:07 PDT 2014

On Tue, May 6, 2014 at 5:36 AM, Peter Caspers <pcaspers1973 at gmail.com> wrote:
> yes, I use clang with the sanitize option to link. I have the
> following libs installed
> peter at peter-ThinkPad-W520:/usr/local/lib/clang/3.5.0/lib/linux$ ls
> libclang_rt.asan-x86_64.a   libclang_rt.lsan-x86_64.a
> libclang_rt.san-x86_64.a        libclang_rt.ubsan-x86_64.a
> libclang_rt.dfsan-x86_64.a  libclang_rt.msan-x86_64.a
> libclang_rt.tsan-x86_64.a
> libclang_rt.full-x86_64.a   libclang_rt.profile-x86_64.a
> libclang_rt.ubsan_cxx-x86_64.a
> You think that should work then ?
How do you invoke Clang? Are the sanitizer flags part of CFLAGS and CXXFLAGS?

Is this an Autools project? Sometimes you have to be creative with
Autotools projects. For example, you might need to do:

    export CC="clang -fsanitize=undefined -fsanitize=address"
    export CXX="clang -fsanitize=undefined -fsanitize=address

That's because there will sometimes be a link line that *omits* CFLAGS
and CXXFLAGS. For example:

    # Link using the compiler...
    $(CC) -o $(program_name) $(OBJECTS) $(LDFLAGS) $(LDLIBS)

On Mac OS X, I also find I need to set DYLD_FALLBACK_LIBRARY_PATH
before executing:

    export DYLD_FALLBACK_LIBRARY_PATH=/usr/local/lib/clang/3.4/lib/darwin/

I don't recall doing similar on Linux. (But I may have done it and
forgotten about it).


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