[C++] Error building from source to use CPLEX

[Jonás Levy Alfie]

Hello! 

I'm quite new to or-tools, I wanted to try building the C++ version from source in order to use CPLEX as third party solver. 

I've been following this guide: https://developers.google.com/optimization/install/cpp/source_linux 

I'm using Ubuntu 18.04, gcc version 6.5.0 20181026 (Ubuntu 6.5.0-2ubuntu1~18.04) 

Also I downloaded or-tools 6.10 

After make third_party I modified Makefile.local adding UNIX_CPLEX_DIR = /opt/ibm/ILOG/CPLEX_Studio126/

When I do make cc I get errors like these; 

./ortools/linear_solver/cplex_interface.cc: In static member function ‘static void operations_research::CplexInterface::MakeRhs(double, double, double&, char&, double&)’:

./ortools/linear_solver/cplex_interface.cc:382:26: error: call of overloaded ‘abs(double&)’ is ambiguous

              (std::abs(ub) == CPX_INFBOUND && std::abs(lb) > CPX_INFBOUND)) {

Any ideas how to solve this? 

Thanks! 

[Laurent Perron]

std::abs<double>(...)

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[Jonás Levy Alfie]

Hi! Thanks for answering. 

I tried that, but returned an error like this;

./ortools/linear_solver/cplex_interface.cc:383:24: error: expected primary-expression before ‘double’

              (std::abs<double>(ub) == CPX_INFBOUND && std::abs(lb) > CPX_INFBOUND)) {

                        ^~~~~~

(Note sure if this was the correct way to try it)

Anyway, I tried a bunch of different stuff that didn't work, then tried including the cmath header and that seemed to work :) 

With that, make cc and make test_cc both worked. 

What do you think? Seems like a correct solution?