[cfe-users] Clang dynamic memory analyzer not referencing back to

Evgeniy Stepanov eugeni.stepanov at gmail.com
Mon Feb 17 23:07:11 PST 2014

All sanitizer tools are supposed to look for llvm-symbolizer in
*_SYMBOLIZER_PATH, followed by PATH. In LLVM 3.3 MSan was at a pretty
early stage, and this logic could have been broken.

On Mon, Feb 17, 2014 at 11:42 PM, David Highley
<dhighley at highley-recommended.com> wrote:
> "David Highley wrote:"
>> We recently built the 3.3 release of clang/llvm using the Fedora 20
>> packaging process as a guide to unpacking, moving the different parts to
>> the correct location and building the compiler tool chain. All seems to
>> be working correctly except the dynamic memory analyzer is not
>> referencing back to the source code. The same usage on the Fedora
>> platform does reference back to the source code.
>> This is our first attempt to use the clang/llvm tool set.  The GCC
>> compiler version 4.4.6 on Red Hat 6.3 does not have support for C++11
>> standard so the current build is without C++11 support. Two possible
>> things to be done are; re-configure to use clang to build clang/llvm and
>> add the c++11 support and or update to the latest 3.4 release.
> We found a solution, do not know quite why we needed to add the extra
> environment setup. Compiling as follows:
> PATH=/net/fas4045/home3/jq031c/llvm_sandbox/bin:$PATH make -j 16
> DEPFILES= CXX=clang++ CC=clang CXXFLAGS="-fsanitize=memory
> -fsanitize-memory-track-origins -fno-omit-frame-pointer"
> LDXFLAGS=-fsanitize=memory
> Runing as follows:
> MSAN_SYMBOLIZER_PATH=/net/fas4045/home3/jq031c/llvm_sandbox/bin/llvm-symbolizer
> ./runtests.sh
> We can understand that we need to add the analysis option to the link
> flags as we do a two step build of compile followed by link. The
> discovery after searching was the need to define the path to llvm-symbolizer with an environment variable which none of the other dynamic analysis options seems to need.
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