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--- c [2023/11/06 08:20] – created nine
+++ c [2025/08/04 13:05] (current) – nine
@@ Line 1: / Line 1: @@
+====== C++ development cheat sheet ======
+===== gdb =====
 Problem
 ''gdb'' warns about unhandled signal:
-''Program received signal SIGILL, illegal instruction.''
+  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 ====
-Solution
+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>
-''handle SIGILL pass nostop noprint''
+select the right alternatives:
+<code>
+sudo update-alternatives --config gcc
+sudo update-alternatives --config g++
+sudo update-alternatives --config gcov
+</code>