Средства и методы разработки

Можете у МЭКа купить бумажный/электронный текст стандарта языка, в свободном виде есть только будущий черновик http://www.open-std.org/jtc1/sc22/wg14/www/docs/n1256.pdf
Глава 4, пункт 6

6 The two forms of conforming implementation are hosted and freestanding. A conforming
hosted implementation shall accept any strictly conforming program. A conforming
freestanding implementation shall accept any strictly conforming program that does not
use complex types and in which the use of the features specified in the library clause
(clause 7) is confined to the contents of the standard headers <float.h>,
<iso646.h>, <limits.h>, <stdarg.h>, <stdbool.h>, <stddef.h>, and
<stdint.h>.Aconforming implementation may have extensions (including additional
library functions), provided they do not alter the behavior of any strictly conforming
program.3)