https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79757
Bug ID: 79757
Summary: ICE in declare_vars, at gimplify.c:634
Product: gcc
Version: 7.0.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: gerhard.steinmetz.fort...@t-online.de
Target Milestone: ---
With invalid code on x86_64 GNU/Linux and option
-fsanitize=undefined or -fsanitize=integer-divide-by-zero,
down to version 4.9 (configured with --enable-checking=yes) :
$ cat z1.c
void fn1 ()
{
unsigned __int128 x, y;
int a() //;
unsigned long long z = x % y;
}
$ gcc-7-20170226 -fsanitize=undefined -c z1.c
z1.c: In function 'a':
z1.c:5:3: error: parameter 'z' is initialized
unsigned long long z = x % y;
^~~~~~~~
z1.c:5:3: internal compiler error: Segmentation fault
0xbf9f9f crash_signal
../../gcc/toplev.c:337
0x96d463 gbind* as_a<gbind*, gimple>(gimple*)
../../gcc/is-a.h:192
0x96d463 declare_vars(tree_node*, gimple*, bool)
../../gcc/gimplify.c:634
0x94999a create_tmp_var(tree_node*, char const*)
../../gcc/gimple-expr.c:477
0xc1bce1 ubsan_encode_value(tree_node*, bool)
../../gcc/ubsan.c:146
0x757fa5 ubsan_instrument_division(unsigned int, tree_node*, tree_node*)
../../gcc/c-family/c-ubsan.c:100
0x69aeab build_binary_op(unsigned int, tree_code, tree_node*, tree_node*, int)
../../gcc/c/c-typeck.c:11834
0x69e7a6 parser_build_binary_op(unsigned int, tree_code, c_expr, c_expr)
../../gcc/c/c-typeck.c:3637
0x6bbd8a c_parser_binary_expression
../../gcc/c/c-parser.c:6818
0x6bc225 c_parser_conditional_expression
../../gcc/c/c-parser.c:6458
0x6bc980 c_parser_expr_no_commas
../../gcc/c/c-parser.c:6375
0x6c371a c_parser_initializer
../../gcc/c/c-parser.c:4351
0x6cfe5d c_parser_declaration_or_fndef
../../gcc/c/c-parser.c:1919
0x6d06ee c_parser_declaration_or_fndef
../../gcc/c/c-parser.c:2073
0x6d4dc2 c_parser_compound_statement_nostart
../../gcc/c/c-parser.c:4831
0x6d53ee c_parser_compound_statement
../../gcc/c/c-parser.c:4740
0x6d082c c_parser_declaration_or_fndef
../../gcc/c/c-parser.c:2112
0x6d87fb c_parser_external_declaration
../../gcc/c/c-parser.c:1468
0x6d9259 c_parser_translation_unit
../../gcc/c/c-parser.c:1348
0x6d9259 c_parse_file()
../../gcc/c/c-parser.c:18173
