https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71451 Bug ID: 71451
Summary: ICE on invalid C++11 code on x86_64-linux-gnu: in
dependent_type_p, at cp/pt.c:22599
Product: gcc
Version: 7.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: su at cs dot ucdavis.edu
Target Milestone: ---
The following code causes an ICE when compiled with the current gcc trunk on
x86_64-linux-gnu in both 32-bit and 64-bit modes.
This is a regression from 4.7.x (as it seems to affect 4.8.x and later).
$ g++-trunk -v
Using built-in specs.
COLLECT_GCC=g++-trunk
COLLECT_LTO_WRAPPER=/usr/local/gcc-trunk/libexec/gcc/x86_64-pc-linux-gnu/7.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc-source-trunk/configure --enable-languages=c,c++,lto
--prefix=/usr/local/gcc-trunk --disable-bootstrap
Thread model: posix
gcc version 7.0.0 20160607 (experimental) [trunk revision 237165] (GCC)
$
$ g++-trunk -std=c++11 small.cpp
small.cpp:6:39: error: parameter packs not expanded with ‘...’:
template < typename A < T::value >::type > void foo ();
^~~~
small.cpp:6:39: note: ‘T’
small.cpp: In substitution of ‘template<typename A<T:: value>::type
...<anonymous> > void B<T>::foo() [with typename A<T:: value>::type
...<anonymous> = {}]’:
small.cpp:12:10: required from here
small.cpp:6:51: internal compiler error: in dependent_type_p, at cp/pt.c:22599
template < typename A < T::value >::type > void foo ();
^~~
0x6c1b53 dependent_type_p(tree_node*)
../../gcc-source-trunk/gcc/cp/pt.c:22599
0x6c2380 dependent_scope_p(tree_node*)
../../gcc-source-trunk/gcc/cp/pt.c:22630
0x6de2e4 tsubst_qualified_id
../../gcc-source-trunk/gcc/cp/pt.c:13753
0x6df3d4 tsubst_copy_and_build(tree_node*, tree_node*, int, tree_node*, bool,
bool)
../../gcc-source-trunk/gcc/cp/pt.c:16224
0x6d401f tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool)
../../gcc-source-trunk/gcc/cp/pt.c:15820
0x6ea07c tsubst_template_arg
../../gcc-source-trunk/gcc/cp/pt.c:10391
0x6f9482 tsubst_template_args
../../gcc-source-trunk/gcc/cp/pt.c:11234
0x6fe28b tsubst_aggr_type
../../gcc-source-trunk/gcc/cp/pt.c:11431
0x6e7121 tsubst(tree_node*, tree_node*, int, tree_node*)
../../gcc-source-trunk/gcc/cp/pt.c:13432
0x6f95de tsubst_template_args
../../gcc-source-trunk/gcc/cp/pt.c:11226
0x6f96fa tsubst_template_args
../../gcc-source-trunk/gcc/cp/pt.c:11194
0x6eff05 tsubst_decl
../../gcc-source-trunk/gcc/cp/pt.c:11726
0x6e799e tsubst(tree_node*, tree_node*, int, tree_node*)
../../gcc-source-trunk/gcc/cp/pt.c:12829
0x6ffbcd instantiate_template_1
../../gcc-source-trunk/gcc/cp/pt.c:17421
0x6ffbcd instantiate_template(tree_node*, tree_node*, int)
../../gcc-source-trunk/gcc/cp/pt.c:17472
0x71161c fn_type_unification(tree_node*, tree_node*, tree_node*, tree_node*
const*, unsigned int, tree_node*, unification_kind_t, int, bool, bool)
../../gcc-source-trunk/gcc/cp/pt.c:17847
0x67243b add_template_candidate_real
../../gcc-source-trunk/gcc/cp/call.c:3110
0x67316c add_template_candidate
../../gcc-source-trunk/gcc/cp/call.c:3188
0x67316c add_candidates
../../gcc-source-trunk/gcc/cp/call.c:5361
0x673a06 build_new_method_call_1
../../gcc-source-trunk/gcc/cp/call.c:8313
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.
$
-----------------------------------------------------------
template < int > struct A;
template < typename ... T >
struct B
{
template < typename A < T::value >::type > void foo ();
};
int main ()
{
B < int > t;
t.foo ();
return 0;
}
Locked
