https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97973
--- Comment #6 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The releases/gcc-10 branch has been updated by Marek Polacek <mpola...@gcc.gnu.org>: https://gcc.gnu.org/g:18f103bd9e5465a10caeb70e2c7890a80c79d60a commit r10-9692-g18f103bd9e5465a10caeb70e2c7890a80c79d60a Author: Marek Polacek <pola...@redhat.com> Date: Fri Apr 9 20:03:45 2021 -0400 c++: ICE with real-to-int conversion in template [PR97973] In this test we are building a call in a template, but since neither the function nor any of its arguments are dependent, we go down the normal path in finish_call_expr. convert_arguments sees that we're binding a reference to int to double and therein convert_to_integer creates a FIX_TRUNC_EXPR. Later, we call check_function_arguments which folds the arguments, and, in a template, fold_for_warn calls fold_non_dependent_expr. But tsubst_copy_and_build should not see a FIX_TRUNC_EXPR (see the patch discussed in <https://gcc.gnu.org/pipermail/gcc-patches/2018-March/496183.html>) or we crash. So let's not create a FIX_TRUNC_EXPR in a template in the first place and instead use IMPLICIT_CONV_EXPR. gcc/cp/ChangeLog: PR c++/97973 * call.c (conv_unsafe_in_template_p): New. (convert_like): Use it. gcc/testsuite/ChangeLog: PR c++/97973 * g++.dg/conversion/real-to-int1.C: New test.
