https://gcc.gnu.org/bugzilla/show_bug.cgi?id=124390
Bug ID: 124390
Summary: ICE when using std::make_unique inside a module
Product: gcc
Version: 16.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: d7d1cd at mail dot ru
Target Milestone: ---
The following code:
$ cat module.ixx
module;
#include <memory>
export module M;
export void foo()
{
auto lambda = []{};
using LambdaType = decltype(lambda);
auto a = std::make_unique<LambdaType>(lambda);
}
When I try to compile it using the trunk version and standard 26:
$ g++ -c -std=c++26 -fmodules module.ixx
I get an internal compiler error:
internal compiler error: in import_entity_index, at cp/module.cc:4330
3 | export module M;
| ^~~~~~
0x2964718 diagnostics::context::diagnostic_impl(rich_location*,
diagnostics::metadata const*, diagnostics::option_id, char const*,
__va_list_tag (*) [1], diagnostics::kind)
???:0
0x295935b internal_error(char const*, ...)
???:0
0xb21ae6 fancy_abort(char const*, int, char const*)
???:0
0xcc6d08 module_state::write_cluster(elf_out*, depset**, unsigned int,
depset::hash&, unsigned int*, unsigned int*)
???:0
0xcc91a9 module_state::write_begin(elf_out*, cpp_reader*,
module_state_config&, unsigned int&)
???:0
0xcca304 finish_module_processing(cpp_reader*)
???:0
0xc42e30 c_parse_final_cleanups()
???:0
0xef7498 c_common_parse_file()
???:0
/cefs/60/6017e589672455bab1a29bcc_gcc-trunk-20260306/bin/../libexec/gcc/x86_64-linux-gnu/16.0.1/cc1plus
-quiet -imultiarch x86_64-linux-gnu -iprefix
/cefs/60/6017e589672455bab1a29bcc_gcc-trunk-20260306/bin/../lib/gcc/x86_64-linux-gnu/16.0.1/
-D_GNU_SOURCE <source> -quiet -dumpdir /app/ -dumpbase output.cpp -dumpbase-ext
.cpp -masm=intel -mtune=generic -march=x86-64 -g -std=c++26
-fdiagnostics-color=always -fno-verbose-asm -fmodules -o /app/output.s
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.
Compiler returned: 1
Here's a reproduction on godbolt: https://godbolt.org/z/zzfjdvdj6
There is no error with C++23 or compiler 15.2.
