running clang scan-build with g++ on linux - c++

Question

I have the following code:
#include <iostream>
#include <memory>
using namespace std;
class A
{
public:
void foo() const;
};
void A::foo() const {}
std::unique_ptr<A> foo2()
{
std::unique_ptr<A> pa(new A());
return pa;
}
void
foo()
{
const A& ra = *foo2();
ra.foo();
}
int
main()
{
foo();
return 0;
}
I am trying to use clang's scan-build:
scan-build g++ --std=c++11 unique_ptr.cpp
This program compiles and runs fine with g++.
I am using CentOS and clang3.8 and g++4.8.5.
Error Message:
error: no type named 'unique_ptr' in namespace 'std'
std::unique_ptr<A> foo2()
~~~~~^

Answer 1

You should use:
scan-build g++ -std=c++11 unique_ptr.cpp
Instead of:
scan-build g++ --std=c++11 unique_ptr.cpp
-std works (while --std doesn't) because scan-build checks specifically for the -std flag.
In clang/tools/scan-build/libexec/ccc-analyzer:
if ($Arg =~ /^-std=/) {
push #CompileOpts,$Arg;
next;
}