https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101364
--- Comment #5 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The trunk branch has been updated by Andrew Pinski <pins...@gcc.gnu.org>: https://gcc.gnu.org/g:879c91fcccf93681bd7e13290bfbb384cadcd268 commit r14-4728-g879c91fcccf93681bd7e13290bfbb384cadcd268 Author: Andrew Pinski <pins...@gmail.com> Date: Sat Oct 14 13:40:05 2023 -0700 [c] Fix PR 101364: ICE after error due to diagnose_arglist_conflict not checking for error When checking to see if we have a function declaration has a conflict due to promotations, there is no test to see if the type was an error mark and then calls c_type_promotes_to. c_type_promotes_to is not ready for error_mark and causes an ICE. This adds a check for error before the call of c_type_promotes_to. OK? Bootstrapped and tested on x86_64-linux-gnu with no regressions. PR c/101364 gcc/c/ChangeLog: * c-decl.cc (diagnose_arglist_conflict): Test for error mark before calling of c_type_promotes_to. gcc/testsuite/ChangeLog: * gcc.dg/pr101364-1.c: New test.