This process was sometimes called linkage editing and the output known as a load module. A compiler works with what are sometimes called 3GL and higher-level languages. An assembler works on programs written using a processor's assembler language.
In general, however, when between vowels (as in exactamente) the Spanish x is pronounced like the English ks sound but softer or less explosive. When it comes before another consonant (as in expediciÃ³n), it has the s sound in some regions/countries but the soft ks sound in others.
Otherwise, the r sounds much like the dd of the word ladder. (It's not exactly the same, but it's much closer to this dd sound than to the English r sound.) The Spanish rr is a vibrating, or trilling sound. The single r is also pronounced this way when it is the first letter of a word.