https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117062
--- Comment #2 from Manuel Lauss <manuel.lauss at googlemail dot com> ---
The failing build step is:
x86_64-pc-linux-gnu-g++ -std=c++11 -fPIE -c -m64 -O3 -march=znver5
-mtune=znver5 -pipe -DIN_GCC -fno-exceptions -fno-rtti
-fasynchronous-unwind-tables -W -Wall -Wno-error=narrowing -Wwrite-strings
-Wcast-qual -Wno-format -Wmissing-format-attribute -Wconditionally-supported
-Woverloaded-virtual -pedantic -Wno-long-long -Wno-variadic-macros
-Wno-overlength-strings -DHAVE_CONFIG_H -fPIE -I. -I.
-I/tmp-ram/portage/sys-devel/gcc-15.0.9999/work/gcc-15.0.9999/gcc
-I/tmp-ram/portage/sys-devel/gcc-15.0.9999/work/gcc-15.0.9999/gcc/.
-I/tmp-ram/portage/sys-devel/gcc-15.0.9999/work/gcc-15.0.9999/gcc/../include
-I/tmp-ram/portage/sys-devel/gcc-15.0.9999/work/gcc-15.0.9999/gcc/../libcpp/include
-I/tmp-ram/portage/sys-devel/gcc-15.0.9999/work/gcc-15.0.9999/gcc/../libcody
-I/tmp-ram/portage/sys-devel/gcc-15.0.9999/work/gcc-15.0.9999/gcc/../libdecnumber
-I/tmp-ram/portage/sys-devel/gcc-15.0.9999/work/gcc-15.0.9999/gcc/../libdecnumber/bid
-I../libdecnumber
-I/tmp-ram/portage/sys-devel/gcc-15.0.9999/work/gcc-15.0.9999/gcc/../libbacktrace
-o dwarf2out.o -MT dwarf2out.o -MMD -MP -MF ./.deps/dwarf2out.TPo
/tmp-ram/portage/sys-devel/gcc-15.0.9999/work/gcc-15.0.9999/gcc/dwarf2out.cc
during GIMPLE pass: vect
/tmp-ram/portage/sys-devel/gcc-15.0.9999/work/gcc-15.0.9999/gcc/dwarf2out.cc:
In function 'bool add_const_value_attribute(dw_die_ref, machine_mode, rtx)':
/tmp-ram/portage/sys-devel/gcc-15.0.9999/work/gcc-15.0.9999/gcc/dwarf2out.cc:20326:1:
internal compiler error: Segmentation fault
20326 | add_const_value_attribute (dw_die_ref die, machine_mode mode, rtx rtl)
| ^~~~~~~~~~~~~~~~~~~~~~~~~
Please submit a full bug report, with preprocessed source (by using
-freport-bug).
I have also seen this today manifest with "xg++" when I try to build current
gcc-15 with gcc-14 and "-march=znver5" or my last build of gcc-15 from
9df0772d50 on AMD64.
The aarch64 "-march=armv8-6a" version builds just fine.
