https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111592
--- Comment #7 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Simon Martin <simar...@gcc.gnu.org>: https://gcc.gnu.org/g:a1999cbc816ecd382c7af4ca44153379de49dcaf commit r15-2792-ga1999cbc816ecd382c7af4ca44153379de49dcaf Author: Simon Martin <si...@nasilyan.com> Date: Wed Aug 7 12:45:12 2024 +0200 c++: Fix ICE on valid involving variadic constructor [PR111592] We currently ICE upon the following valid code, due to the fix made through commit 9efe5fbde1e8 === cut here === struct ignore { ignore(...) {} }; template<class... Args> void InternalCompilerError(Args... args) { ignore{ ignore(args) ... }; } int main() { InternalCompilerError(0, 0); } === cut here === Change 9efe5fbde1e8 avoids infinite recursion in build_over_call by returning error_mark_node if one invokes ignore::ignore(...) with an argument of type ignore, because otherwise we end up calling convert_arg_to_ellipsis for that argument, and recurse into build_over_call with the exact same parameters. This patch tightens the condition to only return error_mark_node if there's one and only one parameter to the call being processed - otherwise we won't infinitely recurse. Successfully tested on x86_64-pc-linux-gnu. PR c++/111592 gcc/cp/ChangeLog: * call.cc (build_over_call): Only error out if there's a single parameter of type A in a call to A::A(...). gcc/testsuite/ChangeLog: * g++.dg/cpp0x/variadic186.C: New test.
