https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71853
Bug ID: 71853
Summary: [6/7 regression] ICE on an ill-formed case statement
in c_do_switch_warnings
Product: gcc
Version: 7.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: msebor at gcc dot gnu.org
Target Milestone: ---
Prior to GCC 6.1, GCC rejected the invalid code below with
xyz.c:3:12: error: expected ‘:’ or ‘...’ before ‘{’ token
Since r225116 committed in the GCC 6.0 development cycle GCC fails on it with
an ICE:
$ cat xyz.c && /build/gcc-trunk-git/gcc/xgcc -B /build/gcc-trunk-git/gcc -S
-Wall -Wextra -Wpedantic xyz.c
void f (void)
{
case (0) {
switch 0: { }
}
}
xyz.c: In function ‘f’:
xyz.c:3:12: error: expected ‘:’ or ‘...’ before ‘{’ token
case (0) {
^
xyz.c:4:12: error: expected ‘(’ before numeric constant
switch 0: { }
^
xyz.c:4:12: warning: statement with no effect [-Wunused-value]
xyz.c:5:3: internal compiler error: Segmentation fault
}
^
0xe96dee crash_signal
/src/gcc/trunk/gcc/toplev.c:335
0x87b066 c_do_switch_warnings(splay_tree_s*, unsigned int, tree_node*,
tree_node*, bool, bool)
/src/gcc/trunk/gcc/c-family/c-common.c:6296
0x7f2b64 c_finish_case(tree_node*, tree_node*)
/src/gcc/trunk/gcc/c/c-typeck.c:10042
0x812c23 c_parser_switch_statement
/src/gcc/trunk/gcc/c/c-parser.c:5612
0x811a35 c_parser_statement_after_labels
/src/gcc/trunk/gcc/c/c-parser.c:5144
0x81149b c_parser_compound_statement_nostart
/src/gcc/trunk/gcc/c/c-parser.c:4861
0x810e8c c_parser_compound_statement
/src/gcc/trunk/gcc/c/c-parser.c:4696
0x8119cb c_parser_statement_after_labels
/src/gcc/trunk/gcc/c/c-parser.c:5135
0x81149b c_parser_compound_statement_nostart
/src/gcc/trunk/gcc/c/c-parser.c:4861
0x810e8c c_parser_compound_statement
/src/gcc/trunk/gcc/c/c-parser.c:4696
0x80ba9c c_parser_declaration_or_fndef
/src/gcc/trunk/gcc/c/c-parser.c:2105
0x80a54e c_parser_external_declaration
/src/gcc/trunk/gcc/c/c-parser.c:1549
0x80a0a5 c_parser_translation_unit
/src/gcc/trunk/gcc/c/c-parser.c:1430
0x83c491 c_parse_file()
/src/gcc/trunk/gcc/c/c-parser.c:17930
0x8aef11 c_common_parse_file()
/src/gcc/trunk/gcc/c-family/c-opts.c:1070
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <http://gcc.gnu.org/bugs.html> for instructions.
