https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106334
Bug ID: 106334
Summary: [13 Regression] lto -g ICE in
dwarf2out_register_external_die at dwarf2out.cc:6072
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
Target Milestone: ---
Noticed ICE on nix-2.10.3 project. It started using LTO recently.
I extracted something that looks like a reproducer, needs 3 files:
// $ cat eval.hh
void listElems();
namespace nix {
struct Value {
auto listItems() {
struct ListIterable {
typedef int* iterator;
iterator begin() __attribute__((noipa)) { return 0; }
iterator end() __attribute__((noipa)) { return 0; }
};
listElems();
return ListIterable{};
}
};
}
// $ cat eval-cache.cc
#include "eval.hh"
void getListOfStrings(nix::Value & v) {
for (auto elem : v.listItems())
;
}
// $ cat eval.cc
#include "eval.hh"
struct iterator {
bool operator!=(iterator);
void operator++();
int operator*() { return 0; }
};
template <typename T> auto enumerate(T) {
struct iterable_wrapper {
auto begin() { return iterator{}; }
auto end() { return iterator{}; }
};
return iterable_wrapper{};
}
void EvalStatecoerceToString(nix::Value & v) {
for (auto v : enumerate(v.listItems()))
;
}
Triggering the crash:
$ g++ -Werror=return-type -O1 -flto -fPIC -g -I. -o eval-cache.o -c
eval-cache.cc
$ g++ -Werror=return-type -O1 -flto -fPIC -g -I. -o eval.o -c eval.cc
$ g++ -Werror=return-type -O1 -flto -fPIC -g -I. -o libnixexpr.so -shared
eval-cache.o eval.o
lto1: internal compiler error: in dwarf2out_register_external_die, at
dwarf2out.cc:6072
0xa059db dwarf2out_register_external_die
../../gcc-13-20220710/gcc/dwarf2out.cc:6072
0x903d0d lto_read_decls
../../gcc-13-20220710/gcc/lto/lto-common.cc:1952
0x904a7a lto_file_finalize
../../gcc-13-20220710/gcc/lto/lto-common.cc:2271
0x904a7a lto_create_files_from_ids
../../gcc-13-20220710/gcc/lto/lto-common.cc:2281
0x904a7a lto_file_read
../../gcc-13-20220710/gcc/lto/lto-common.cc:2336
0x904a7a read_cgraph_and_symbols(unsigned int, char const**)
../../gcc-13-20220710/gcc/lto/lto-common.cc:2784
0x8eca42 lto_main()
../../gcc-13-20220710/gcc/lto/lto.cc:626
Using '-g0' makes the file compile.
Compiler is this week's gcc-13 snapshot:
$ g++ -v
Using built-in specs.
COLLECT_GCC=/<<NIX>>/gcc-debug-13.0.0/bin/g++
COLLECT_LTO_WRAPPER=/<<NIX>>/gcc-debug-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 20220710 (experimental) (GCC)
