title: Why -bash: /usr/bin/g++: cannot execute binary file?
body: <pre><code>simpatico$ /Developer/usr/bin/g++-4.2 -v
  Using built-in specs.
  Target: i686-apple-darwin10
  Configured with: /var/tmp/gcc/gcc-5664~89/src/configure --disable-checking --enable-werror --prefix=/usr --mandir=/share/man --enable-languages=c,objc,c++,obj-c++ --program-transform-name=/^[cg][^.-]*$/s/$/-4.2/ --with-slibdir=/usr/lib --build=i686-apple-darwin10 --program-prefix=i686-apple-darwin10- --host=x86_64-apple-darwin10 --target=i686-apple-darwin10 --with-gxx-include-dir=/include/c++/4.2.1
  Thread model: posix
  gcc version 4.2.1 (Apple Inc. build 5664)
  
  simpatico$ /usr/bin/g++ -v
  -bash: /usr/bin/g++: cannot execute binary file
  </code></pre>
  
  <p>I don't know of a command that proves that /usr/bin/g++  is an alias of /Developer/usr/bin/g++-4.2.</p>