nolibc is a tweakable header-only implementation of a standard C library subset, which helps to build lean binaries without linking against the runtime.

nolibc provides necessary built-in functions, macros and type aliases to facilitate most needs a lean binary might have.

• assert.h:
  • overridable assert macro;
  • overridable static_assert macro;
• errno.h:
  • errno_t type alias,
  • basic errno codes including EOK,
  • strerror and strerror_s functions;
• limits.h:
  • CHAR_BIT,
  • RSIZE_MAX for probabilistic validation of size_t values;
• stdalign.h:
  • alignof, alignas, etc.;
• stdbool.h:
  • bool type,
  • true and false boolean values;
• stddef.h:
  • NULL,
  • size_t and rsize_t standard types;
• stdlib.h:
  • overridable abort function,
  • constraint_handler_t type;
• stdnoreturn.h:
  • noreturn function qualifier;
• string.h:
  • memcpy, and memcpy_s,
  • memset,
  • strlen.