'log2' is not a member of 'std'

[Jean-Francois Gobin]

Jan, 

Could you test with the file renamed as « prog.cc <http://prog.cc/> »? I remember that gcc is picky about the extension.

Jean
 


> Le 2 juil. 2017 à 12:28, Jan Stary <hans at stare.cz> a écrit :
> 
> 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
> 

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