In 1990-1991, in my first job, I insisted on using gcc on SunOS primarily because I wanted to use ANSI C89 features (primarily function prototypes). These were

In 1990-1991, in my first job, I insisted on using gcc on SunOS primarily because I wanted to use ANSI C89 features (primarily function prototypes). These were already available on the other two platforms we were targeting (the Microsoft C compiler, and Apple Macintosh Programmers Workbench), and the standard SunOS PCC-based compiler didn't support any of the new Standard C features.