g++4.9.2 fails to compile standard C++11 code
Vlad Gheorghiu
vgheorgh@gmail.com
Wed Mar 11 23:18:00 GMT 2015
The following code fails to compile under latest cygwin, Windows 7,
g++4.9.2. Compiled with g++ -std=c++11 test.cpp. The compiler
complains that std::log2 is not a member of std.
#include <cmath>
#include <iostream>
int main()
{
auto x = std::log2(10);
std::cout << x << std::endl;
}
Verbatim error:
g++ -std=c++11 test.cpp
test.cpp: In function ‘int main()’:
test.cpp:5:11: error: ‘log2’ is not a member of ‘std’
auto x = std::log2(10);
^
test.cpp:5:11: note: suggested alternative:
In file included from
/usr/lib/gcc/i686-pc-cygwin/4.9.2/include/c++/cmath:44:0,
from test.cpp:1:
/usr/include/math.h:305:15: note: ‘log2’
extern double log2 _PARAMS((double));
--
Dr. Vlad Gheorghiu
Institute for Quantum Computing
Waterloo, Ontario
Canada
http://community.iqc.uwaterloo.ca/vgheorgh/
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