https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116929
Bug ID: 116929
Summary: ICE in write_unnamed_type_name when building redumper
Product: gcc
Version: 15.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: sjames at gcc dot gnu.org
Target Milestone: ---
Originally reported downstream in Gentoo at https://bugs.gentoo.org/940571.
14 fails but 15 works. It came up when rebuilding 'redumper' in the wild.
```
$ make CXX=g++-14
g++-14 -flto=auto -ggdb -march=native -mtune=native -std=gnu++20 -fmodules-ts
-fmodule-mapper=hex_bin.ixx.o.modmap -MD -fdeps-format=p1689r5 -x c++ -o
hex_bin.ixx.o -c hex_bin.ixx.ii -freport-bug
during IPA pass: *free_lang_data
In file included from
/usr/lib/gcc/x86_64-pc-linux-gnu/14/include/g++-v14/cctype:42,
from
/usr/lib/gcc/x86_64-pc-linux-gnu/14/include/g++-v14/bits/localefwd.h:42,
from
/usr/lib/gcc/x86_64-pc-linux-gnu/14/include/g++-v14/bits/ios_base.h:40,
from
/usr/lib/gcc/x86_64-pc-linux-gnu/14/include/g++-v14/iomanip:42,
from
/var/tmp/portage/app-cdr/redumper-411/work/redumper-build_411/utils/hex_bin.ixx:4:
/usr/include/ctype.h:47:1: internal compiler error: in write_unnamed_type_name,
at cp/mangle.cc:1806
47 | {
| ^
0x56dd14565440 write_unnamed_type_name
/usr/src/debug/sys-devel/gcc-14.2.1_p20240928/gcc-14-20240928/gcc/cp/mangle.cc:1806
0x56dd14565440 write_unqualified_name
/usr/src/debug/sys-devel/gcc-14.2.1_p20240928/gcc-14-20240928/gcc/cp/mangle.cc:1589
0x56dd1500fe8e write_class_enum_type
/usr/src/debug/sys-devel/gcc-14.2.1_p20240928/gcc-14-20240928/gcc/cp/mangle.cc:3096
0x56dd1500fe8e write_type
/usr/src/debug/sys-devel/gcc-14.2.1_p20240928/gcc-14-20240928/gcc/cp/mangle.cc:2515
0x56dd15013c61 mangle_decl_string
/usr/src/debug/sys-devel/gcc-14.2.1_p20240928/gcc-14-20240928/gcc/cp/mangle.cc:4418
0x56dd15014000 get_mangled_id
/usr/src/debug/sys-devel/gcc-14.2.1_p20240928/gcc-14-20240928/gcc/cp/mangle.cc:4441
0x56dd15014000 mangle_decl(tree_node*)
/usr/src/debug/sys-devel/gcc-14.2.1_p20240928/gcc-14-20240928/gcc/cp/mangle.cc:4479
0x56dd15e11ab8 decl_assembler_name(tree_node*)
/usr/src/debug/sys-devel/gcc-14.2.1_p20240928/gcc-14-20240928/gcc/tree.cc:719
0x56dd15e11ab8 assign_assembler_name_if_needed(tree_node*)
/usr/src/debug/sys-devel/gcc-14.2.1_p20240928/gcc-14-20240928/gcc/tree.cc:834
0x56dd16f1c083 free_lang_data_in_cgraph
/usr/src/debug/sys-devel/gcc-14.2.1_p20240928/gcc-14-20240928/gcc/ipa-free-lang-data.cc:1064
0x56dd16f1c083 free_lang_data
/usr/src/debug/sys-devel/gcc-14.2.1_p20240928/gcc-14-20240928/gcc/ipa-free-lang-data.cc:1109
0x56dd16f1c083 execute
/usr/src/debug/sys-devel/gcc-14.2.1_p20240928/gcc-14-20240928/gcc/ipa-free-lang-data.cc:1176
Please submit a full bug report, with preprocessed source.
Please include the complete backtrace with any bug report.
See <https://bugs.gentoo.org/> for instructions.
The bug is not reproducible, so it is likely a hardware or OS problem.
make: *** [Makefile:2: all] Error 1
```
--
```
Using built-in specs.
COLLECT_GCC=gcc-14
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-pc-linux-gnu/14/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with:
/var/tmp/portage/sys-devel/gcc-14.2.1_p20240928/work/gcc-14-20240928/configure
--host=x86_64-pc-linux-gnu --build=x86_64-pc-linux-gnu --prefix=/usr
--bindir=/usr/x86_64-pc-linux-gnu/gcc-bin/14
--includedir=/usr/lib/gcc/x86_64-pc-linux-gnu/14/include
--datadir=/usr/share/gcc-data/x86_64-pc-linux-gnu/14
--mandir=/usr/share/gcc-data/x86_64-pc-linux-gnu/14/man
--infodir=/usr/share/gcc-data/x86_64-pc-linux-gnu/14/info
--with-gxx-include-dir=/usr/lib/gcc/x86_64-pc-linux-gnu/14/include/g++-v14
--disable-silent-rules --disable-dependency-tracking
--with-python-dir=/share/gcc-data/x86_64-pc-linux-gnu/14/python
--enable-languages=c,c++,fortran --enable-obsolete --enable-secureplt
--disable-werror --with-system-zlib --disable-nls
--disable-libunwind-exceptions --enable-checking=yes,extra,rtl
--with-bugurl=https://bugs.gentoo.org/ --with-pkgversion='Gentoo Hardened
14.2.1_p20240928 p5' --with-gcc-major-version-only --enable-libstdcxx-time
--enable-lto --disable-libstdcxx-pch --enable-shared --enable-threads=posix
--enable-__cxa_atexit --enable-clocale=gnu --enable-multilib
--with-multilib-list=m32,m64 --disable-fixed-point --enable-targets=all
--enable-libgomp --disable-libssp --disable-libada --disable-cet
--disable-systemtap --enable-valgrind-annotations --disable-vtable-verify
--disable-libvtv --with-zstd --with-isl --disable-isl-version-check
--enable-default-pie --enable-host-pie --enable-host-bind-now
--enable-default-ssp --disable-fixincludes --with-build-config=bootstrap-O3
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 14.2.1 20240928 (Gentoo Hardened 14.2.1_p20240928 p5)
```
