Created attachment 591418 [details]
arma.ii.gz

Description of problem:
g++ refuses to compile seemingly valid C++ code from Armadillo library

Version-Release number of selected component (if applicable):
gcc version 4.7.0 20120507 (Red Hat 4.7.0-5)

How reproducible:
use g++ to compile code using "ivec3" class from Armadillo

Steps to Reproduce:
1. install Armadillo 3.2.2 from http://arma.sourceforge.net/download.html
2. try to compile code using "ivec3" class from Armadillo
3. look bewildered

Actual results:
refuses to compile, stating that various forms of operator() are inaccessible.

Expected results:
should compile; known to compile with gcc 4.4.6 (RHEL 6.2).
also known to compile with clang 3.0

Additional info:
See attached file, "arma.ii.gz", generated using
g++ -v -save-temps -O2 -o arma arma.cpp


Upstream GCC bug:
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53549


Code that fails to compile:

#include <iostream>
#include "armadillo"

using namespace arma;
using namespace std;

int main(int argc, char** argv)
  {
  cout << "Armadillo version: " << arma_version::as_string() << endl;
  
  ivec3 x;
  x.ones();
  x.print("x:");
  
  return 0;
  }