): in such a case, applying va_arg to the null argument may crash the program if an unexpected definition of NULL is encountered. For instance, issues occur with conditional operators or when passing NULL to a variadic function (taking. Unfortunately, there are less contrived problems in practice. Consider the interaction of _Generic with NULL: it’s not clear which function will be called because it depends on the definition of NULL: While C doesn’t have function overloading, the protean definition of NULL still causes headaches. This posed problems for overload resolution, generic programming, etc. Its purpose was to alleviate the problems with the definition of NULL, which can be defined in a variety of ways: (void *)0 (a pointer constant), 0 (an integer), and so on. The nullptr constant first appeared in C++11, described in proposal N2431 from 2007. This section describes the most interesting ones. GCC 13 has implemented a host of C2X proposals. We use C2X to refer to the next major C standard version it is expected to become C23. You can use the -std=c2x or -std=gnu2x command-line options to enable C2X features. The default C dialect in GCC 13 is -std=gnu17. If you’re interested in the C++ language and what's supported in recent GCC releases, check out New C++ features in GCC 10 and New C++ features in GCC 12. This article describes new features implemented in the C front end it does not discuss developments in the C language itself. It also doesn’t cover recent changes in the C library itself. It's also possible to try GCC 13 on and similar pages. Red Hat Enterprise Linux (RHEL) users will get GCC 13 in the Red Hat GCC Toolset (RHEL 8 and RHEL 9). GCC 13 is already the system compiler in Fedora 38. Like every major GCC release, this version will bring many additions, improvements, bug fixes, and new features. The latest major version of the GNU Compiler Collection (GCC), 13.1, was released in April 2023.
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