https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106540
Bug ID: 106540
Summary: [13 Regression] lto -g ICE in
dwarf2out_register_external_die at dwarf2out.cc:6076
Product: gcc
Version: 13.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: lto
Assignee: unassigned at gcc dot gnu.org
Reporter: slyfox at gcc dot gnu.org
CC: marxin at gcc dot gnu.org, rguenth at gcc dot gnu.org
Target Milestone: ---
It's a very similar form of https://gcc.gnu.org/PR106334 where nix-2.10.3
package enabled -flto recently and started ICEing gcc.
This time I got the following 3-file reproducer:
// $ cat eval.hh
struct Value {
auto listItems() {
struct ListIterable {
typedef int *iterator;
iterator _begin, _end;
iterator begin() { return _begin; }
iterator end() { return _end; }
};
return ListIterable{};
}
};
// $ cat eval-cache.cc
#include "eval.hh"
void AttrCursorgetListOfStrings(Value & v) {
for (auto elem : v.listItems())
;
}
// $ cat eval.cc
#include "eval.hh"
template <typename T> auto enumerate(T) {
struct iterator {
int iter;
bool operator!=(iterator) { return iter; }
void operator++() {}
auto operator*() { return 0; }
};
struct iterable_wrapper {
auto begin() { return iterator{}; }
auto end() { return iterator{}; }
};
return iterable_wrapper{};
}
void coerceToString(Value & v) {
for (auto elem : enumerate(v.listItems()))
;
}
Crashing:
$ g++ -O0 -flto -flto-partition=none -g1 -fPIC -I. -Wall -o eval.o -c eval.cc
eval.cc: In function 'void coerceToString(Value&)':
eval.cc:16:13: warning: unused variable 'elem' [-Wunused-variable]
16 | for (auto elem : enumerate(v.listItems()))
| ^~~~
$ g++ -O0 -flto -flto-partition=none -g1 -fPIC -I. -Wall -o eval-cache.o -c
eval-cache.cc
eval-cache.cc: In function 'void AttrCursorgetListOfStrings(Value&)':
eval-cache.cc:4:13: warning: unused variable 'elem' [-Wunused-variable]
4 | for (auto elem : v.listItems())
| ^~~~
$ g++ -O0 -flto -flto-partition=none -g1 -fPIC -I. -Wall -o libbug.so -shared
eval-cache.o eval.o
lto1: internal compiler error: in dwarf2out_register_external_die, at
dwarf2out.cc:6076
0xa093ff dwarf2out_register_external_die
../../gcc-13-20220731/gcc/dwarf2out.cc:6076
0x90743d lto_read_decls
../../gcc-13-20220731/gcc/lto/lto-common.cc:1952
0x908193 lto_file_finalize
../../gcc-13-20220731/gcc/lto/lto-common.cc:2271
0x908193 lto_create_files_from_ids
../../gcc-13-20220731/gcc/lto/lto-common.cc:2281
0x908193 lto_file_read
../../gcc-13-20220731/gcc/lto/lto-common.cc:2336
0x908193 read_cgraph_and_symbols(unsigned int, char const**)
../../gcc-13-20220731/gcc/lto/lto-common.cc:2784
0x8f0132 lto_main()
../../gcc-13-20220731/gcc/lto/lto.cc:626
Please submit a full bug report, with preprocessed source (by using
-freport-bug).
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
It is a this week's gcc with
https://gcc.gnu.org/git/?p=gcc.git;a=commitdiff;h=bc7526f6fca0e6ac3bd462ae54170fa464539148
applied.
$ g++ -v |& unnix
Using built-in specs.
COLLECT_GCC=/<<NIX>>/gcc-13.0.0/bin/g++
COLLECT_LTO_WRAPPER=/<<NIX>>/gcc-13.0.0/libexec/gcc/x86_64-unknown-linux-gnu/13.0.0/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with:
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 13.0.0 20220731 (experimental) (GCC)
I suspect this crash has something to do with auto-inferred types that are
defined within a function.
