From mboxrd@z Thu Jan  1 00:00:00 1970
From: Thierry Banel <tbanelwebmin@free.fr>
Subject: Re: C++ code block not linked
Date: Sat, 25 Nov 2017 16:38:44 +0100
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References: <y65shd276bp.fsf@mun.ca>
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On 25/11/2017 15:59, Roger Mason wrote:
> Hello,
>
> This code compiles fine on command line but org-babel can't link it.
>
> #+BEGIN_SRC C++ :flags "-std=c++11 -I/usr/local/include" :libs  "-L/usr/local/lib -lginac"
> #include <iostream>
> #include <ginac/ginac.h>
> using namespace std;
> using namespace GiNaC;
>
> int main () {
>      symbol a("a"), b("b"), x("x"), y("y");
>      lst eqns, vars;
>      eqns = a*x+b*y==3, x-y==b;
>      vars = x, y;
>      cout << lsolve(eqns, vars) << endl;
>       // -> {x==(3+b^2)/(b+a),y==(3-b*a)/(b+a)
>
> return 0;
> }
> #+END_SRC
>
> The error buffer contains many lines like this:
>
> /tmp//ccv5YYn1.o: In function `main':
> C-src-1046xti.cpp:(.text+0x67): undefined reference to `GiNaC::symbol::symbol(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)'
>
>
> Org mode version 9.0.3 (release_9.0.3-170-gfed1cf @
> /home/rmason/.emacs.d/org-git/org-mode/lisp/)
>
> GNU Emacs 25.3.1 (i386-portbld-freebsd10.3, GTK+ Version 3.22.15) of
> 2017-11-22
>
> Thanks for any help.
>
> Roger
>
>

I get the correct result:

#+RESULTS:
| {x==(3+b^2)*(a+b)^(-1) | y==-(-3+a*b)*(a+b)^(-1)} |

I use Or mode version 9.1.1