https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118704
Bug ID: 118704
Summary: [15 regression] ICE when building nmap with LTO
Product: gcc
Version: 15.0
Status: UNCONFIRMED
Keywords: ice-on-valid-code
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: sjames at gcc dot gnu.org
CC: aoliva at gcc dot gnu.org
Target Milestone: ---
Reproducer:
```
g++ -c ARPHeader.ii -o ARPHeader.o -O2 -flto -fno-strict-aliasing
g++ -c TCPHeader.ii -o TCPHeader.o -O2 -flto -fno-strict-aliasing
g++ -c PacketParser.ii -o PacketParser.o -O2 -flto -fno-strict-aliasing
x86_64-pc-linux-gnu-ar cr libnetutil.a \
ARPHeader.o \
TCPHeader.o \
PacketParser.o
g++ FPEngine.ii osscan2.ii main.ii libnetutil.a
```
```
[...]
$ g++ FPEngine.ii osscan2.ii main.ii libnetutil.a
during GIMPLE pass: ifcombine
../../var/tmp/portage/net-analyzer/nmap-7.95/work/nmap-7.95/libnetutil/PacketParser.cc:
In function ‘parse_packet’:
../../var/tmp/portage/net-analyzer/nmap-7.95/work/nmap-7.95/libnetutil/PacketParser.cc:124:13:
internal compiler error: in make_bit_field_load, at gimple-fold.cc:7862
124 | pkt_type_t *PacketParser::parse_packet(const u8 *pkt, size_t pktlen,
bool eth_included){
| ^
0x651c7767cdd7 internal_error(char const*, ...)
/usr/src/debug/sys-devel/gcc-15.0.9999/gcc-15.0.9999/gcc/diagnostic-global-context.cc:517
0x651c7767cf72 fancy_abort(char const*, int, char const*)
/usr/src/debug/sys-devel/gcc-15.0.9999/gcc-15.0.9999/gcc/diagnostic.cc:1722
0x651c765bb2de make_bit_field_load
/usr/src/debug/sys-devel/gcc-15.0.9999/gcc-15.0.9999/gcc/gimple-fold.cc:7862
0x651c77cb0d9d fold_truth_andor_for_ifcombine(tree_code, tree_node*, unsigned
long, tree_code, tree_node*, tree_node*, unsigned long, tree_code, tree_node*,
tree_node*, tree_node**)
/usr/src/debug/sys-devel/gcc-15.0.9999/gcc-15.0.9999/gcc/gimple-fold.cc:8779
0x651c78061cd8 ifcombine_ifandif
/usr/src/debug/sys-devel/gcc-15.0.9999/gcc-15.0.9999/gcc/tree-ssa-ifcombine.cc:976
0x651c78053cd0 tree_ssa_ifcombine_bb_1
/usr/src/debug/sys-devel/gcc-15.0.9999/gcc-15.0.9999/gcc/tree-ssa-ifcombine.cc:1071
0x651c77a822e8 tree_ssa_ifcombine_bb
/usr/src/debug/sys-devel/gcc-15.0.9999/gcc-15.0.9999/gcc/tree-ssa-ifcombine.cc:1207
0x651c77a822e8 execute
/usr/src/debug/sys-devel/gcc-15.0.9999/gcc-15.0.9999/gcc/tree-ssa-ifcombine.cc:1400
Please submit a full bug report, with preprocessed source (by using
-freport-bug).
Please include the complete backtrace with any bug report.
See <https://bugs.gentoo.org/> for instructions.
lto-wrapper: fatal error: g++ returned 1 exit status
compilation terminated.
/usr/lib/gcc/x86_64-pc-linux-gnu/15/../../../../x86_64-pc-linux-gnu/bin/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/15/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-15.0.9999/work/gcc-15.0.9999/configure
--host=x86_64-pc-linux-gnu --build=x86_64-pc-linux-gnu --prefix=/usr
--bindir=/usr/x86_64-pc-linux-gnu/gcc-bin/15
--includedir=/usr/lib/gcc/x86_64-pc-linux-gnu/15/include
--datadir=/usr/share/gcc-data/x86_64-pc-linux-gnu/15
--mandir=/usr/share/gcc-data/x86_64-pc-linux-gnu/15/man
--infodir=/usr/share/gcc-data/x86_64-pc-linux-gnu/15/info
--with-gxx-include-dir=/usr/lib/gcc/x86_64-pc-linux-gnu/15/include/g++-v15
--disable-silent-rules --disable-dependency-tracking
--with-python-dir=/share/gcc-data/x86_64-pc-linux-gnu/15/python
--enable-objc-gc --enable-languages=c,c++,d,go,objc,obj-c++,fortran,ada,m2,rust
--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 15.0.9999 p, commit
43f8fd917f4f080aee81e0677df429aa4eb23100' --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-offload-defaulted
--enable-offload-targets=nvptx-none --enable-libgomp --disable-libssp
--enable-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 bootstrap-lto'
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 15.0.1 20250129 (experimental)
d4d4e874dee2d5b0abe5ceb9f2a78e5602e86030 (Gentoo Hardened 15.0.9999 p, commit
43f8fd917f4f080aee81e0677df429aa4eb23100)
``
