https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97125
--- Comment #8 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:c48ffe21f8f3478cf08f9442e3f973df358caf2a commit r11-3397-gc48ffe21f8f3478cf08f9442e3f973df358caf2a Author: Marek Polacek <pola...@redhat.com> Date: Sun Sep 20 16:11:00 2020 -0400 c: Fix -Wduplicated-branches ICE [PR97125] We crash here because since r11-3302 the C FE uses codes like SWITCH_STMT in the else branches in the attached test, and inchash::add_expr in do_warn_duplicated_branches doesn't handle these front-end codes. In the C++ FE this works because by the time we get to do_warn_duplicated_branches we've already cp_genericize'd the SWITCH_STMT tree into a SWITCH_EXPR. The fix is to call do_warn_duplicated_branches_r only after loops and other structured control constructs have been lowered. gcc/c-family/ChangeLog: PR c/97125 * c-gimplify.c (c_genericize): Only call do_warn_duplicated_branches_r after loops and other structured control constructs have been lowered. gcc/testsuite/ChangeLog: PR c/97125 * c-c++-common/Wduplicated-branches-15.c: New test.
