Useful resources

C FAQs

• C FAQ - Answers to the frequently asked questions from the Usenet newsgroup comp.lang.c

C Language and library references

• JTC1/SC22/WG14 - the C Standards Committee, includes draft C language standards, proposals, and defect reports
  • n1124.pdf - C99 first post-publication draft
  • n1570.pdf - C11 final working draft
  • C17 FDIS - C17 final draft
  • n2347.pdf - C2x latest working draft
• comp.std.c - Discussion about C language standards.
• GNU C Manual - C core language reference as implemented by the GNU C compiler.

C ABIs

• System V ABI for x86-64, Intel386, and IA MCU architectures
• Windows x64 ABI
• PowerPC EABI for 32-bit embedded processors
• PowerOpen ABI for older PowerPC platforms
• ARM ABI for ARM architecture

Related standards

• POSIX.1-2008 - The operating system API of the Unix-compatible systems
• Linux man pages - the Linux OS API documentation

Open-source implementations

• Standard library implementations

• GNU libc
• MUSL
• Newlib
• PDClib

• Compilers

• GCC
• LLVM Clang

Might be also useful

• List of C libraries