'log2' is not a member of 'std'

[Ken Cunningham]

See this as well:

<https://trac.macports.org/ticket/53226>

Ken

On 2017-07-02, at 3:28 AM, Jan Stary wrote:

> This is MacOSX 10.6.8 running various compilers provided by MacPorts.
> Compiling the following C++ source
> 
> 	#include <cmath>
> 
> 	int main(void)
> 	{
> 		double d = std::log2(2.3456789f);
> 		return 0;
> 	}
> 
> results in
> 
> 	'log2' is not a member of 'std'.
> 
> This happens with the system g++, which is i686-apple-darwin10-g++-4.2.1,
> each of g++-4.0 g++-4.2 g++-mp-5 g++-mp-6, and with clang++-mp-3.4;
> in each case, I am compiling as $CXX -std=c++11 prog.c
> 
> Apparently, there is some relatively recent turmoil about the C++ libs;
> I don't know much c++ but find myself compiling some third party C++ code.
> Am I missing something obvious?
> 
> 	Jan
>