recommending compiler flag options for beginer

[vulee]

What would be the compiler flag options to identify errors and dangerous warnings for g++?

Thanks

[moorecm]

Like -Wall?

man gcc for more information.

[vulee]

I used that but it wasn't good enough. I read the man gcc but there are too many options. I was kind of hoping some gurus would assist me with the response...

I defined a method in the header file but didn't provide the implementation in the cpp file. The compiler happily compiled the code. What options should I use to make the compiler flag that as error?

Another example,

class foo{
public:
bool run();
};

and in the cpp file

#include "foo.h"

....
bool run(){ //note that there is a typo with no scope like bool foo::run()

}

......

The compiler displayed error messages which are un-related to the real issue. It took me over an hour to scan through my codes and fixed that.

[jsmith]

The problem is that what you typed is completely legal. To the compiler, it looks like run() is a free function that you
are implementing in the .cpp file. It doesn't know that what you really meant was "foo::run".

[vulee]

Would the compiler know that the method bool run() has been declared in the header but not the implementation?

Would you recommend some useful flag options?

[Galik]

Would the compiler know that the method bool run() has been declared in the header but not the implementation?

I am guessing that is what the error message you got was about. Strictly speaking it would be a link error. Only the linker can detect that you failed to implement what you told the compiler you were going to.