It's surreal how slowly time moves in the world of C compilers.
Today there are still active projects that are hesitant to move past C89, and C99 is still the "new" standard.
The C99 standard has been released before the first public Mac OS X and Windows XP. It's older Itanium and the x86-64 instruction set. It predates iPod, Game Cube, first ever Xbox, and Nokia 3310.
Entire platforms lived and died in the meantime, while C programmers still can't be sure if they can rely on the new C99.
