https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84126
Bug ID: 84126
Summary: [8 Regression] ICE in variadic generic lambda inside a
template function calling a function with arguments by
reference
Product: gcc
Version: 8.0.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: benni.buch at gmail dot com
Target Milestone: ---
template <typename T>
void bar(T&){} // ICE with reference, work with just T
template <typename T >
void foo(T){
[](auto ... k){
(bar(k), ...);
}(0);
}
int main() {
foo(0);
}
$ g++ -std=c++17 equal.cpp
during RTL pass: expand
equal.cpp: In lambda function:
equal.cpp:7:13: internal compiler error: in make_decl_rtl, at varasm.c:1315
(bar(k), ...);
~~~^~~
0x76ba10 make_decl_rtl(tree_node*)
../../gcc/gcc/varasm.c:1314
0xb7bb9d expand_expr_real_1(tree_node*, rtx_def*, machine_mode,
expand_modifier, rtx_def**, bool)
../../gcc/gcc/expr.c:9958
0xb856be expand_expr
../../gcc/gcc/expr.h:276
0xb856be expand_expr_addr_expr_1
../../gcc/gcc/expr.c:7939
0xb79fe4 expand_expr_addr_expr
../../gcc/gcc/expr.c:8060
0xb79fe4 expand_expr_real_1(tree_node*, rtx_def*, machine_mode,
expand_modifier, rtx_def**, bool)
../../gcc/gcc/expr.c:11220
0xa6297f expand_normal
../../gcc/gcc/expr.h:282
0xa6297f precompute_register_parameters
../../gcc/gcc/calls.c:987
0xa6297f expand_call(tree_node*, rtx_def*, int)
../../gcc/gcc/calls.c:3977
0xb79dc5 expand_expr_real_1(tree_node*, rtx_def*, machine_mode,
expand_modifier, rtx_def**, bool)
../../gcc/gcc/expr.c:10992
0xa7518e expand_expr
../../gcc/gcc/expr.h:276
0xa7518e expand_call_stmt
../../gcc/gcc/cfgexpand.c:2690
0xa7518e expand_gimple_stmt_1
../../gcc/gcc/cfgexpand.c:3624
0xa7518e expand_gimple_stmt
../../gcc/gcc/cfgexpand.c:3790
0xa761ff expand_gimple_basic_block
../../gcc/gcc/cfgexpand.c:5810
0xa7ad67 execute
../../gcc/gcc/cfgexpand.c:6416
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
$ g++ --version
g++ (GCC) 8.0.1 20180130 (experimental)
Copyright (C) 2018 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
Boost.Hana test suite has some test cases that run into this!
Known to work with GCC 6.3:
$ g++-6 --version
g++-6 (Ubuntu/Linaro 6.3.0-18ubuntu2~16.04) 6.3.0 20170519
Copyright (C) 2016 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
