What is "pqcc"

The Production Quality Compiler-Compiler Project (or PQCC) was a long-term project led by William Wulf at Carnegie Mellon University to produce an industrial-strength compiler-compiler. PQCC would produce full, optimizing programming language compilers from descriptions of the programming language and the target machine. Though the goal of a fully automatic process was not realized, PQCC technology and ideas were the basis of production compilers from Intermetrics, Tartan Laboratories, and others.