PCC at gos.i
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The Portable C Compiler (also known as pcc or sometimes pccm - portable C compiler machine) is an early compiler for the C programming language written by Stephen C. Johnson of Bell Labs in the mid-1970s, based in part on ideas from Alan Snyder in 1973.
The keys to the success of pcc were its portability and improved diagnostic capabilities:

1.The compiler was designed so that only a few of its source files were machine-dependent.
2.It was relatively robust to syntax errors and performed more thorough validity checks.