https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123587
Bug ID: 123587
Summary: [16 regression] ICE when building llvm-21.1.8
Product: gcc
Version: 16.0
Status: UNCONFIRMED
Keywords: ice-on-valid-code, lto, needs-reduction
Severity: normal
Priority: P3
Component: ipa
Assignee: unassigned at gcc dot gnu.org
Reporter: sjames at gcc dot gnu.org
Target Milestone: ---
```
$ gcc -O3 -std=gnu89 -c c-index-test.c.i -o c-index-test.c.o
$ g++ -std=c++17 -O3 -flto -o /dev/null c-index-test.c.o core_main.cpp.ii
FrontendAction.cpp.ii FrontendActions.cpp.ii ParseAST.cpp.ii
SemaChecking.cpp.ii SemaExpr.cpp.ii SemaExprObjC.cpp.ii
during IPA pass: cp
lto1: internal compiler error: Segmentation fault
Please submit a full bug report, with preprocessed source (by using
-freport-bug).
See <https://bugs.gentoo.org/> for instructions.
lto-wrapper: fatal error: g++ returned 1 exit status
compilation terminated.
/usr/x86_64-pc-linux-gnu/binutils-bin/9999/ld: error: lto-wrapper failed
collect2: error: ld returned 1 exit status
```
```
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-pc-linux-gnu/16/lto-wrapper
OFFLOAD_TARGET_NAMES=nvptx-none
OFFLOAD_TARGET_DEFAULT=1
Target: x86_64-pc-linux-gnu
Configured with:
/var/tmp/portage/sys-devel/gcc-16.0.9999/work/gcc-16.0.9999/configure
--host=x86_64-pc-linux-gnu --build=x86_64-pc-linux-gnu --prefix=/usr
--bindir=/usr/x86_64-pc-linux-gnu/gcc-bin/16
--includedir=/usr/lib/gcc/x86_64-pc-linux-gnu/16/include
--datadir=/usr/share/gcc-data/x86_64-pc-linux-gnu/16
--mandir=/usr/share/gcc-data/x86_64-pc-linux-gnu/16/man
--infodir=/usr/share/gcc-data/x86_64-pc-linux-gnu/16/info
--with-gxx-include-dir=/usr/lib/gcc/x86_64-pc-linux-gnu/16/include/g++-v16
--disable-silent-rules --disable-dependency-tracking
--with-python-dir=/share/gcc-data/x86_64-pc-linux-gnu/16/python
--enable-libphobos --enable-languages=c,c++,d,fortran,ada,jit --enable-obsolete
--enable-secureplt --disable-werror --with-system-zlib --enable-nls
--without-included-gettext --disable-libunwind-exceptions
--enable-checking=yes,extra,rtl --with-bugurl=https://bugs.gentoo.org/
--with-pkgversion='Gentoo Hardened 16.0.9999 p, commit
2e21af15be068befb82fb9ada4cfadd1ed003a3a' --with-gcc-major-version-only
--enable-libstdcxx-time --enable-lto --disable-libstdcxx-pch --enable-shared
--enable-threads=posix --enable-__cxa_atexit --enable-clocale=gnu
--with-tls=gnu2 --enable-multilib --with-multilib-list=m32,m64
--disable-fixed-point --enable-targets=all --enable-offload-defaulted
--enable-offload-targets=nvptx-none --enable-libgomp --disable-libssp
--enable-libada --enable-cet --enable-systemtap --disable-valgrind-annotations
--disable-valgrind-interop --disable-vtable-verify --disable-libvtv --with-zstd
--without-isl --enable-default-pie --enable-host-pie --enable-host-bind-now
--enable-default-ssp --disable-fixincludes
--with-gxx-libcxx-include-dir=/usr/include/c++/v1 --enable-host-shared
--enable-libgdiagnostics --enable-linker-build-id
--with-build-config='bootstrap-O3 bootstrap-cet'
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 16.0.1 20260113 (experimental)
77ff7c2bb2240d64b8b03c87adc3d42957d59ae8 (Gentoo Hardened 16.0.9999 p, commit
2e21af15be068befb82fb9ada4cfadd1ed003a3a)
```
