https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63786
Bug ID: 63786
Summary: crash on argument pack in switch case
Product: gcc
Version: 4.9.2
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: rhainin1 at binghamton dot edu
Created attachment 33924
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=33924&action=edit
minimal code to reproduce
using "case Is:" where Is is an argument pack (invalid code) causes gcc to
crash.
gcc-4.9.2 configured with "--enable-languages=c,c++" on 64-bit Debian 7.4
I have also compiled with -Wall -Wextra -pedantic -g and tried -std=c++14, with
no difference.
$ g++ -std=c++11 expandcase.cpp
expandcase.cpp: In instantiation of ‘int f(int) [with int ...Is = {1, 2, 3}]’:
expandcase.cpp:10:15: required from here
expandcase.cpp:4:9: internal compiler error: unexpected expression ‘Is’ of kind
template_parm_index
case Is:
^
0x66b440 cxx_eval_constant_expression
../../src/gcc/cp/semantics.c:9822
0x66cf16 cxx_eval_outermost_constant_expr
../../src/gcc/cp/semantics.c:9842
0x5a9d99 finish_case_label(unsigned int, tree_node*, tree_node*)
../../src/gcc/cp/decl.c:3190
0x5ce90c tsubst_expr
../../src/gcc/cp/pt.c:13675
0x5ce7e4 tsubst_expr
../../src/gcc/cp/pt.c:13443
0x5cee5d tsubst_expr
../../src/gcc/cp/pt.c:13648
0x5ce092 tsubst_expr
../../src/gcc/cp/pt.c:13668
0x5cee5d tsubst_expr
../../src/gcc/cp/pt.c:13648
0x5cdc12 instantiate_decl(tree_node*, int, bool)
../../src/gcc/cp/pt.c:19971
0x5e483b instantiate_pending_templates(int)
../../src/gcc/cp/pt.c:20087
0x5fd24f cp_write_global_declarations()
../../src/gcc/cp/decl2.c:4340
