New Diagnostic in Clang: -Wimplicit-pointer-condition

New Diagnostic.m

@class MyClass;

int main(int argc, char *argv[])
{
    void *obj = nil;
    
    if(obj) {}
    
    if((obj)) {}
    
    for(void *var; var;) {}
    
    while(obj) {}
    
    while(obj != 0) {}
    
    id var = nil;
    
    while(var) {}
    
    while((var)) {}
  
    MyClass *myClass = nil;
    MyClass **myClassPtr = &myClass;
  
    if(myClass) {}
    if(*myClassPtr) {}
  
    void (^blk)(void);
  
    if(blk) {}
    
    return 0;
}

Result.txt

./clang ~/test.m -Wimplicit-pointer-condition -fsyntax-only
/Users/remydemarest/test.m:7:5: warning: using pointer expression as condition [-Wimplicit-pointer-condition]
    if(obj) {}
    ^  ~~~
/Users/remydemarest/test.m:11:5: warning: using pointer expression as condition [-Wimplicit-pointer-condition]
    for(void *var; var;) {}
    ^              ~~~
/Users/remydemarest/test.m:13:5: warning: using pointer expression as condition [-Wimplicit-pointer-condition]
    while(obj) {}
    ^     ~~~
/Users/remydemarest/test.m:19:5: warning: using pointer expression as condition [-Wimplicit-pointer-condition]
    while(var) {}
    ^     ~~~
/Users/remydemarest/test.m:26:5: warning: using pointer expression as condition [-Wimplicit-pointer-condition]
    if(myClass) {}
    ^  ~~~~~~~
/Users/remydemarest/test.m:27:5: warning: using pointer expression as condition [-Wimplicit-pointer-condition]
    if(*myClassPtr) {}
    ^  ~~~~~~~~~~~
/Users/remydemarest/test.m:31:5: warning: using pointer expression as condition [-Wimplicit-pointer-condition]
    if(blk) {}
    ^  ~~~
7 warnings generated.