gcc sanitizer

To use the GCC sanitizer on COSMA4:

   module load swift
   module load swift/c4/gcc/intelmpi/5.1.2

   ./autogen.sh                                                                         (if fresh checkout)
   ./configure --enable-debug --enable-sanitizer --disable-optimization --with-metis
   make clean
   make

   setenv ASAN_OPTIONS symbolize=1
   setenv ASAN_SYMBOLIZER_PATH /cosma/local/llvm/3.5.0/bin/llvm-symbolizer

The setenv values make sure that you get line numbers in the dump report. (Not needed for GCC 4.9+, we have 4.8 on COSMA).

Note to use inside ddt/gdb you need to set a break point __asan_report_error otherwise the program will just exit. Also do not enable memory checking in ddt.

To get a core dump on exit, you need to set:

setenv  ASAN_OPTIONS abort_on_error=1:disable_coredump=0::unmap_shadow_on_exit=1

(64bit version apparently). That's handy when attaching a debugger is problematic.