function y = myabsval(u)   
%#codegen
y = abs(u);

codegen -config:lib myabsval -args {0.0}

function y = callmyabsval(y)  
%#codegen
% Check the target. Do not use coder.ceval if callmyabsval is
% executing in MATLAB
if coder.target('MATLAB')
  % Executing in MATLAB, call function myabsval
  y = myabsval(y);
else
  % add the required include statements to generated function code
  coder.updateBuildInfo('addIncludePaths','$(START_DIR)\codegen\lib\myabsval');
  coder.cinclude('myabsval_initialize.h');
  coder.cinclude('myabsval.h');
  coder.cinclude('myabsval_terminate.h');

  % Executing in the generated code. 
  % Call the initialize function before calling the 
  % C function for the first time
  coder.ceval('myabsval_initialize');

  % Call the generated C library function myabsval
  y = coder.ceval('myabsval',y);
  
  % Call the terminate function after
  % calling the C function for the last time
  coder.ceval('myabsval_terminate');
end

codegen -config:mex callmyabsval codegen\lib\myabsval\myabsval.lib -args {-2.75}

coder.updateBuildInfo('addLinkObjects','myabsval.lib','$(START_DIR)\codegen\lib\myabsval',100,true,true);

callmyabsval_mex(-2.75)

callmyabsval(-2.75)