https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97986
--- Comment #14 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Martin Uecker <[email protected]>: https://gcc.gnu.org/g:5175ef7f7577a1ef4151f306161a1dab904f23bb commit r16-4919-g5175ef7f7577a1ef4151f306161a1dab904f23bb Author: Martin Uecker <[email protected]> Date: Fri Oct 31 16:10:40 2025 +0100 c: Fix ICE when using va_arg with arrays [PR97986] When array type is passed to va_arg, this is undefined behavior. Emit a warning, and insert a run-time trap after evaluating side effects, but return the correct type for sizeof / typeof. For C90 a VLA is an error. PR c/97986 gcc/c/ChangeLog: * c-parser.cc (c_parser_postfix_expression): Adapt. * c-tree.h (c_build_va_arg): Adapt prototype. * c-typeck.cc (c_build_va_arg): Handle UB. gcc/testsuite/ChangeLog: * gcc.dg/pr97986-1.c: New test. * gcc.dg/pr97986-2.c: New test.
