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The compiler is based on the original Portable C Compiler by Stephen C. Johnson, written in the late 70's. Even though much of the compiler has been rewritten, some of the basics still remain.

PCC debuted in Unix Version 7 and replaced the DMR compiler (Dennis Ritchie's original C compiler) in both System V and the BSD 4.x releases.

Some history about pcc is in the [A History of UNIX before Berkeley: UNIX Evolution: 1975-1984]( and in the [Evolution of C](

A copy of S. C. Johnson's and Donn Seeley's 1978 ``A Tour Through the Portable C Compiler'' is available in [HTML](,
[Postscript]( or [PDF]( (For current pcc internal documentation, see the [[internals]] wiki page.)

About 50% of the frontend code and 80% of the [[backend|internals]] code has been rewritten. Most stuff is written by Anders Magnusson, with the exception of the data-flow analysis part and the SSA conversion code which is written by Peter A Jonsson, and the Mips port that were written as part of a project by undergraduate students at Luleaa University of Technology (LTU).

It was publicly announced to the NetBSD community on September 14, 2007. Shortly later it was
imported to the OpenBSD, NetBSD, and pkgsrc source trees.

On January 27, 2008, the version was increased to 0.9.9 as pcc supported C99 language constructs.

People nowadays have difficulty balancing their time at home and at work. Whether at home, in the office, or in school, writing assignments can take an enormous amount of valuable time. With the kind of lifestyle that many people have, it is very evident that many students do not take the time sit down and really put some thought in to the assignment before writing. Students who try and balance a full social life and school responsibilities often find it really difficult to make the two successfully work. 

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