g ++ / c ++ makefile依赖项生成会忽略boost标头？

Question

I am using the makefile dependency generation options in g++ (and c++) like this:

c++ -I/opt/local/include -MM main.cc

On a file, main.cc:

#include <iostream>
#include <boost/shared_ptr.hpp>

#include "projects/all_projects.h"

int main(int argc, const char * argv[])
{
  // ...
}

The -MM option prevents the generation of dependencies for iostream which is good, but not for shared_ptr.hpp. Is there a way I can prevent the dependency generation for boost headers (or even for any headers in angle brackets for that matter)?

I read that earlier versions of gcc used to consider any headers in angle brackets as system headers, but that is no longer the case.

Answer 1

Use c++ -isystem /opt/local/include -MM main.cc

(and man gcc :-) )