[cfe-dev] a patch for clang static checker: optimization.StrLengthCalculation

[彩云追月]

Hello ,
    I implemented another checker for clang static checker. 
    It checks that some code uses strlen(or wcslen)  to calculate the length of an std::string( or std::wstring).
    
   example: 


#include <string>
#include <string.h>

void test() {
  std::string s;
  if (strlen(s.c_str()) != 0) {}; // warn 
}   


Currently, I want to study clang static analyzer through developing some checkers.But I do not know whether my patches will be accepted by the clang community. 

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