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C17 (C standard revision)
C programming language standard, 2017 revision

C17, formally ISO/IEC 9899:2018, is an open standard for the C programming language, prepared in 2017 and published on 2018-07-05. It replaced C11 (standard ISO/IEC 9899:2011), and is superseded by C23 (ISO/IEC 9899:2024) since October 2024. Since it was under development in 2017, and officially published in 2018, C17 is sometimes referred to as C18.

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Changes from C11

C17 fixes numerous minor defects in C11 without introducing new language features.6

The __STDC_VERSION__ macro is increased to the value 201710L.

For a detailed list of changes from the previous standard, see Clarification Request Summary for C11.7

Compiler support

List of compilers supporting C17:

See also

  • Computer programming portal

Further reading

  • N2176 (final draft of C17 standard); WG14; 2017-10-09.
  • N2310 (post-C17, very early draft of what would become C23; WG14; 2018-11-11.
  • ISO/IEC 9899:2018 (official C17 standard); ISO; 2018.

References

  1. "ISO/IEC 9899:2018 - Information technology -- Programming languages -- C". International Organization for Standardization. Archived from the original on 1 April 2025. Retrieved 16 April 2025. https://www.iso.org/standard/74528.html ↩

  2. "ISO/IEC 9899:2018 - Information technology -- Programming languages -- C". International Organization for Standardization. Archived from the original on 1 April 2025. Retrieved 16 April 2025. https://www.iso.org/standard/74528.html ↩

  3. "The Standard - C". www.iso-9899.info. http://www.iso-9899.info/wiki/The_Standard ↩

  4. "WG 14 Document log". www.open-std.org. http://www.open-std.org/jtc1/sc22/wg14/www/wg14_document_log.htm ↩

  5. "Using the GNU Compiler Collection (GCC): C Dialect Options". gcc.gnu.org. https://gcc.gnu.org/onlinedocs/gcc-8.1.0/gcc/C-Dialect-Options.html#index-std-1 ↩

  6. "The Standard - C". www.iso-9899.info. http://www.iso-9899.info/wiki/The_Standard ↩

  7. ISO/IEC JTC1/SC22/WG14 (October 2017). "Clarification Request Summary for C11 Version 1.13". www.open-std.org. Retrieved 28 September 2020.{{cite web}}: CS1 maint: numeric names: authors list (link) http://www.open-std.org/jtc1/sc22/wg14/www/docs/n2244.htm ↩

  8. "Using the GNU Compiler Collection (GCC): C Dialect Options". gcc.gnu.org. https://gcc.gnu.org/onlinedocs/gcc-8.1.0/gcc/C-Dialect-Options.html#index-std-1 ↩

  9. "Clang 7 documentation — Clang Compiler User's Manual". http://releases.llvm.org/7.0.0/tools/clang/docs/UsersManual.html#differences-between-various-standard-modes ↩

  10. "IAR Information Center for Arm - Release notes". netstorage.iar.com. https://netstorage.iar.com/SuppDB/Public/UPDINFO/013857/arm/doc/infocenter/readme.ENU.html ↩

  11. "C11 and C17 Standard Support Arriving in MSVC". devblogs.microsoft.com. 14 September 2020. https://devblogs.microsoft.com/cppblog/c11-and-c17-standard-support-arriving-in-msvc/ ↩

  12. "Changelog - Added support for new C17 standard". www.smorgasbordet.com/pellesc/. http://www.smorgasbordet.com/pellesc/changes_800_900.htm ↩