https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97973
--- Comment #3 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Marek Polacek <mpola...@gcc.gnu.org>: https://gcc.gnu.org/g:40465293cd780aa82dcae75dfcfb1449d8c0561e commit r11-7709-g40465293cd780aa82dcae75dfcfb1449d8c0561e Author: Marek Polacek <pola...@redhat.com> Date: Wed Mar 3 18:37:49 2021 -0500 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.
