C++ related

Improving C++ builds.md

Improving C++ builds 1

Tricks:

• compilers do a lot less in Debug, use it in development
  • minimze optimizations
• remove unreachable or dead code
  • cppcheck, Coverity, Understand, CppDepend, OCLint, gcov...
• unused sources, libraries
• commonly used sources => static libraries
• use granular includes
  • applications (bad includes): Resharper C++ Analyzer, Doxygen + Graphviz, IWYU...
• move definitions from header files
  • use link time optimization (or unity build) for inlining
  • use forward declarations where feasible
• 3rd party code
  • create wrapper types/headers for 3rd party libraries
  • create forward declaration headers
• PIMPL
  • preserves ABI
• tricks
  1. pre-compiled headers
  2. ubity builds

Watch the rule of chiel (from fastest to slowest)

1. look up memoized type
2. add a parameter to an alias call
3. add a parameter to a type
4. call an alias
5. instantiate a type
6. instantiate a function template
7. SFINAE

Templates

• diagnostics: -ftime-report and templight

Dynamic linking

• in Unix compile with -fvisibility=hidden

Linkers

• lld

• CMake - LINK_WHAT_YOU_USE

• cmake --graphviz=[file]