https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84304
Bug ID: 84304 Summary: tree check fail in to_wide, at tree.h:5527 Product: gcc Version: 8.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c Assignee: unassigned at gcc dot gnu.org Reporter: dcb314 at hotmail dot com Target Milestone: --- For this C source code: a, b; c() { char d[b]; char *e = &d[0]; strncpy(a, e, 3); } with flag -O2, recent gcc trunk does this: bug417.c:2:1: internal compiler error: tree check: expected integer_cst, have pl us_expr in to_wide, at tree.h:5527 c() { ^ 0x59606c tree_check_failed(tree_node const*, char const*, int, char const*, ...) ../../trunk/gcc/tree.c:9325 0x6f9a88 tree_check(tree_node const*, char const*, int, char const*, tree_code) ../../trunk/gcc/tree.h:3388 0x6f9a88 wi::to_wide(tree_node const*) ../../trunk/gcc/tree.h:5527 0x6f9a88 wi::to_wide(tree_node const*, unsigned int) ../../trunk/gcc/tree.h:5538 I'll have a go at finding a range of revisions for the bug.