Very outdated gcc in conda-forge causing CyLP not to build.

[rcjackson]

When I try and build @jjhelmus's branch I get the following error:

gcc -pthread -B /home/rjackson/anaconda3/envs/adi_env3/compiler_compat -Wl,--sysroot=/ -Wsign-compare -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -fPIC -I./cylp/cpp -I./cylp/cy -I/home/rjackson/anaconda3/envs/adi_env3/include/coin -I/home/rjackson/anaconda3/envs/adi_env3/lib/python3.6/site-packages/numpy/core/include -I. -I/home/rjackson/anaconda3/envs/adi_env3/include/python3.6m -c cylp/cpp/IClpPrimalColumnPivotBase.cpp -o build/temp.linux-x86_64-3.6/cylp/cpp/IClpPrimalColumnPivotBase.o -w cc1plus: warning: command line option ‘-Wstrict-prototypes’ is valid for C/ObjC but not for C++ [enabled by default] In file included from /home/rjackson/anaconda3/envs/adi_env3/gcc/include/c++/cstdint:35:0, from /home/rjackson/anaconda3/envs/adi_env3/include/coin/CoinTypes.hpp:15, from /home/rjackson/anaconda3/envs/adi_env3/include/coin/CoinHelperFunctions.hpp:24, from /home/rjackson/anaconda3/envs/adi_env3/include/coin/CoinIndexedVector.hpp:20, from cylp/cpp/IClpPrimalColumnPivotBase.h:6, from cylp/cpp/IClpPrimalColumnPivotBase.cpp:1: /home/rjackson/anaconda3/envs/adi_env3/gcc/include/c++/bits/c++0x_warning.h:32:2: error: #error This file requires compiler and library support for the ISO C++ 2011 standard. This support is currently experimental, and must be enabled with the -std=c++11 or -std=gnu++11 compiler options. #error This file requires compiler and library support for the \

I tracked this down to the very, very old version of gcc that is in conda-forge (4.8.5). I got it to build with gcc 6.3.0, so I would not use the conda-forge gcc to try and build CyLP. I wonder if there is a way to get gcc 6.3.0 as a conda package?

[tkralphs]

Cbc is building fine on conda-forge under Linux and OS X. cylp can easily be pip installed once Cbc has been conda installed. So this does not seem to be an issue anymore. If so, feel free to re-open.