C++ Toolchain.

Building C++: the standards, the flags, the linker's own rules, and the tools that read a binary. Covers 10 topics.

• C++ Toolchain · 1 of 3

  Package managers

  In CMake 3.25, what does the REQUIRED keyword change in find_package() when the package is missing?

  Aconfigure writes a cache noteBthe link step prints a warningCthe build prints a warningDconfigure stops with an error

• C++ Toolchain · 2 of 3

  Compile times

  In C++, what does a precompiled header (.gch) let g++ skip?

  Aemitting template symbolsBopening the headers it containsCwriting the object file to diskDpreprocessing the .cpp file itself

• C++ Toolchain · 3 of 3

  Debugging

  With g++ 12.2.0, a glibc backtrace() at -O2 lists one function fewer than at -O0. What is the reason?

  A-O2 renamed that function's own symbolBthe call was skipped at run timeCbacktrace() drops frames past fiveDthe compiler inlined that function