我的貓是最可愛的貓 : D

clang VS gcc

when return boolean, such as:

bool Init(){
    // do something 
    
}

in gcc you can return nothing, but in clang you must return a boolean value. Or clang will throw segmentation fault

Code must be:

bool Init(){
    // do something
    return true; //or return false
    
}

How to replace gcc with clang in unix

• first install llvm and clang:

  sudo apt install llvm
  sudo apt insatll clang
  

• change default c++

  for cpp:

  sudo update-alternatives --config c++
  
  There are 2 choices for the alternative c++ (providing /usr/bin/c++).
  
    Selection    Path              Priority   Status
  ------------------------------------------------------------
    0            /usr/bin/g++       20        auto mode
    1            /usr/bin/clang++   10        manual mode
  * 2            /usr/bin/g++       20        manual mod
  
  Press enter to keep the current choice[*], or type selection number: 1
  

  c in the same way:

  sudo update-alternatives --config cc
  There are 2 choices for the alternative cc (providing /usr/bin/cc).
  
    Selection    Path            Priority   Status
  ------------------------------------------------------------
    0            /usr/bin/gcc     20        auto mode
    1            /usr/bin/clang   10        manual mode
  * 2            /usr/bin/gcc     20        manual mode
  
  Press <enter> to keep the current choice[*], or type selection number: 1
  update-alternatives: using /usr/bin/clang to provide /usr/bin/cc (cc) in manual mode
  

  OK, Now you use clang instead of gcc/g++