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Cases of void parameters, other than a parameter list of (void) (or equivalent with a typedef for void) in its entirety, have been made a constraint violation in C2Y (N3344 alternative 1 was adopted), as part of a series of changes to eliminate unnecessary undefined behavior by turning it into constraint violations, implementation-defined behavior or something else with stricter bounds on what behavior is allowed. Previously, these were implicitly undefined behavior (see DR#295), with only some cases listed in Annex J as undefined (but even those cases not having wording in the normative text to make them explicitly undefined). As discussed in bug 114816, GCC is not entirely consistent about diagnosing such usages; unnamed void parameters get errors when not the entire parameter list, while qualified and register void (the cases listed in Annex J) get errors as a single unnamed parameter, but named void parameters are accepted with a warning (in a declaration that's not a definition; it's not possible to define a function with incomplete parameter types). Following C2Y, make all these cases into errors. The errors are not conditional on the standard version, given that this was previously implicit undefined behavior. Since it wasn't possible anyway to define such functions, only declare them without defining them (or otherwise use such parameters in function type names that can't correspond to any defined function), hopefully the risks of compatibility issues are small. Bootstrapped with no regressions for x86-64-pc-linux-gnu. PR c/114816 gcc/c/ * c-decl.cc (grokparms): Do not warn for void parameter type here. (get_parm_info): Give errors for void parameters even when named. gcc/testsuite/ * gcc.dg/c2y-void-parm-1.c: New test. * gcc.dg/noncompile/920616-2.c, gcc.dg/noncompile/921116-1.c, gcc.dg/parm-incomplete-1.c: Update expected diagnostics. |
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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.