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This warning covers the C23 incompibilities resulting from using () as parameter lists in function declarations. The warning name comes from Clang. The implementation is not perfect because GCC treats these two declarations as equivalent: void f (); void f (not_a_type); This is a bit confusing because they are clearly visually distinct. However, as of GCC 14, the second form is an error by default, so treating both the same as far as -Wdeprecated-non-prototype does not seem so bad from a user experience view. gcc/c-family/ PR c/95445 * c-opts.cc (c_common_post_options): Initialize warn_deprecated_non_prototype. * c.opt (Wdeprecated-non-prototype): New option. * c.opt.urls: Regenerate. gcc/c/ PR c/95445 * c-decl.cc (start_function): Warn about parameters after parameter-less declaration. * c-typeck.cc (build_function_call_vec): Pass fntype to convert_arguments. (convert_arguments): Change argument to fntype and compute typelist. Warn about parameter list mismatches on first parameter. gcc/ PR c/95445 * doc/invoke.texi: Document -Wdeprecated-non-prototype. gcc/testsuite/ PR c/95445 * gcc.dg/Wdeprecated-non-prototype-1.c: New test. * gcc.dg/Wdeprecated-non-prototype-2.c: New test. * gcc.dg/Wdeprecated-non-prototype-3.c: New test. * gcc.dg/Wdeprecated-non-prototype-4.c: New test. |
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This directory contains the GNU Compiler Collection (GCC). The GNU Compiler Collection is free software. See the files whose names start with COPYING for copying permission. The manuals, and some of the runtime libraries, are under different terms; see the individual source files for details. The directory INSTALL contains copies of the installation information as HTML and plain text. The source of this information is gcc/doc/install.texi. The installation information includes details of what is included in the GCC sources and what files GCC installs. See the file gcc/doc/gcc.texi (together with other files that it includes) for usage and porting information. An online readable version of the manual is in the files gcc/doc/gcc.info*. See http://gcc.gnu.org/bugs/ for how to report bugs usefully. Copyright years on GCC source files may be listed using range notation, e.g., 1987-2012, indicating that every year in the range, inclusive, is a copyrightable year that could otherwise be listed individually.