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====== C++ development cheat sheet ======

===== gdb =====


Problem

''gdb'' warns about unhandled signal:

  Program received signal SIGILL, illegal instruction.

The solutio is to add a signal handler
  handle SIGILL pass nostop noprint
  
===== Sanitizer =====

log to file
  ASAN_OPTIONS="log_path=asan.log" ./a.out
  
full docs: https://github.com/google/sanitizers/wiki/AddressSanitizerFlags

globally for the ''CMakeLists.txt'' project:
  add_compile_options(-fsanitize=address)
  add_link_options(-fsanitize=address)

for a target:
  target_compile_options(<build-target> PRIVATE -fsanitize=address)
  target_link_options(<build-target> PRIVATE -fsanitize=address)

==== tsan ====

Problem when executing a binary:
  FATAL: ThreadSanitizer: unexpected memory mapping 0x5a36aaebd000-0x5a36aafd2000


Sulution, disable ASLR for testing:
  setarch --addr-no-randomize build/path/to/binary

or:
  sudo sysctl vm.mmap_rnd_bits=30   # 30: partly, 28 totally

==== alternatives ====

declare alternatives:
<code>
sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-12 20
sudo update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-12 20
sudo update-alternatives --install /usr/bin/gcov gcov /usr/bin/gcov-12 20
sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-13 30
sudo update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-13 30
sudo update-alternatives --install /usr/bin/gcov gcov /usr/bin/gcov-13 30
</code>

select the right alternatives:
<code>
sudo update-alternatives --config gcc
sudo update-alternatives --config g++
sudo update-alternatives --config gcov
</code>