Package: g++-16 Version: 16-20260322-1 Severity: normal Dear Maintainer,
A colleague (in Bcc to preserve their email address from spam
from scrapers of the BTS) identified an internal compiler error
affecting import of <memory> with modules support. The error
does not appear with g++-15. They suspect commit 10b8379
"[PATCH] libstdc++: Add smart ptr owner_equals and owner_hash"
to have revealed the problem, but they admit it may have simply
raised a pre-existing bug that remained dormant.
Symptoms look like:
$ make
g++-16 -std=gnu++26 -fmodules -c -o qt.o qt.cpp
g++-16 -std=gnu++26 -fmodules -c -o failed_mod.o failed_mod.cpp
In file included from failed_mod.cpp:3:
minimal.h:56:13: internal compiler error: in register_duplicate, at
cp/module.cc:13054
56 | return {};
| ^
0x322e8ff internal_error(char const*, ...)
../../src/gcc/diagnostic-global-context.cc:787
0xf9e0cf fancy_abort(char const*, int, char const*)
../../src/gcc/diagnostics/context.cc:1813
0x114a416 register_duplicate
../../src/gcc/cp/module.cc:13054
0x11547a8 decl_value
../../src/gcc/cp/module.cc:8819
0x114a714 tree_node
../../src/gcc/cp/module.cc:10437
0x11536e6 module_state::read_cluster(unsigned int)
../../src/gcc/cp/module.cc:17682
0x11541cf module_state::load_section(unsigned int, binding_slot*)
../../src/gcc/cp/module.cc:21516
0x1154286 module_state::lazy_load(unsigned int, binding_slot*)
../../src/gcc/cp/module.cc:22539
0x114c245 tree_node
../../src/gcc/cp/module.cc:11045
0x115333b module_state::read_cluster(unsigned int)
../../src/gcc/cp/module.cc:17519
0x11541cf module_state::load_section(unsigned int, binding_slot*)
../../src/gcc/cp/module.cc:21516
0x1154286 module_state::lazy_load(unsigned int, binding_slot*)
../../src/gcc/cp/module.cc:22539
0x114c245 tree_node
../../src/gcc/cp/module.cc:11045
0x115333b module_state::read_cluster(unsigned int)
../../src/gcc/cp/module.cc:17519
0x11541cf module_state::load_section(unsigned int, binding_slot*)
../../src/gcc/cp/module.cc:21516
0x1154286 module_state::lazy_load(unsigned int, binding_slot*)
../../src/gcc/cp/module.cc:22539
0x11585fa lazy_load_pendings(tree_node*, tree_node*)
../../src/gcc/cp/module.cc:22640
0x125e987 instantiate_decl(tree_node*, bool, bool)
../../src/gcc/cp/pt.cc:28601
0x126923b instantiate_pending_templates(int)
../../src/gcc/cp/pt.cc:28896
0x10bbc8c c_parse_final_cleanups()
../../src/gcc/cp/decl2.cc:5887
/usr/libexec/gcc/x86_64-linux-gnu/16/cc1plus -quiet -imultiarch
x86_64-linux-gnu -D_GNU_SOURCE failed_mod.cpp -quiet -dumpbase failed_mod.cpp
-dumpbase-ext .cpp -mtune=generic -march=x86-64 -std=gnu++26 -fmodules
-fasynchronous-unwind-tables -o /tmp/ccXRarOv.s
Please submit a full bug report, with preprocessed source (by using
-freport-bug).
Please include the complete backtrace with any bug report.
See <file:///usr/share/doc/gcc-16/README.Bugs> for instructions.
make: *** [<builtin>: failed_mod.o] Error 1
I have attached the reproducer files to the bug report. In its
current state, the reproducer depends on:
* g++-16
* qt6-base-dev
but I guess there may be options to further reduce the scope.
Have a nice day, :)
Étienne.
-- System Information:
Debian Release: forky/sid
APT prefers unstable
APT policy: (500, 'unstable'), (1, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386
Kernel: Linux 6.19.11+deb14-amd64 (SMP w/12 CPU threads; PREEMPT)
Locale: LANG=C.UTF-8, LC_CTYPE=C.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled
Versions of packages g++-16 depends on:
pn g++-16-x86-64-linux-gnu <none>
pn gcc-16 <none>
ii gcc-16-base 16-20260322-1
g++-16 recommends no packages.
Versions of packages g++-16 suggests:
pn g++-16-multilib <none>
pn gcc-16-doc <none>
--
.''`. Étienne Mollier <[email protected]>
: :' : pgp: 8f91 b227 c7d6 f2b1 948c 8236 793c f67e 8f0d 11da
`. `' sent from /dev/pts/0, please excuse my verbosity
`- on air: Saga - Chase The Wind
module; #include "minimal.h" export module failed_mod; import qt;
CXX = g++-16
CXXFLAGS = -std=gnu++26 -fmodules
all: failed_mod.o
.PHONY: all
failed_mod.o: qt.o
clean:
rm -vf *.o *.i
rm -rvf gcm.cache
.PHONY: clean
#ifndef QOBJECT_H
#define QOBJECT_H
#include <memory>
template<typename T>
struct QTypeInfo
{
static constexpr bool isIntegral = true;
};
template<typename T>
struct QBasicAtomicInteger
{
static_assert(QTypeInfo<T>::isIntegral, "template parameter is not an integral type");
};
class QObject;
struct QMetaObject
{
const QObject* cast(const QObject* obj) const;
};
struct QByteArray
{
QBasicAtomicInteger<int> at;
};
namespace std {
template<>
struct hash<QByteArray>
{};
} // namespace std
template<typename Enum>
struct QFlags
{
QFlags() {}
};
struct QMetaType
{
enum class TypeFlag
{
};
typedef QFlags<TypeFlag> TypeFlags;
static int registerType(const QMetaObject* metaObject);
};
inline QFlags<int>
operator|(QMetaType::TypeFlag /*f1*/, QMetaType::TypeFlag /*f2*/) noexcept
{
return {};
}
template<typename T>
struct CapabilitiesImpl;
struct QSequentialIterableImpl
{
template<class T>
QSequentialIterableImpl()
{
CapabilitiesImpl<T>::IteratorCapabilities | (1 << 4);
}
};
template<>
struct QTypeInfo<QSequentialIterableImpl>
{};
class QObject
{
static bool disconnect(const QObject* sender, const char* signal, const QObject* receiver, const char* member);
bool disconnect(const char* signal, const QObject* receiver, const char* member) const;
std::unique_ptr<int> d_ptr;
};
#endif // QOBJECT_H
module;
#include "minimal.h"
export module qt;
export using QObject = ::QObject;
extern "C++" int
main()
{
}
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