https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123150
Bug ID: 123150
Summary: [16 regression] ICE when building GNAT
(gcc/ada/exp_dbug.adb:1572:4: error: dominator of 7
should be 31, not 33)
Product: gcc
Version: 16.0
Status: UNCONFIRMED
Keywords: build, 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: tnfchris at gcc dot gnu.org, victorldn at gcc dot gnu.org
Target Milestone: ---
```
/var/tmp/portage/sys-devel/gcc-16.0.9999/work/build/./prev-gcc/xgcc
-B/var/tmp/portage/sys-devel/gcc-16.0.9999/work/build/./prev-gcc/
-B/usr/x86_64-pc-linux-gnu/bin/ -B/usr/x86_64-pc-linux-gnu/bin/
-B/usr/x86_64-pc-linux-gnu/lib/ -isystem /usr/x86_64-pc-linux-gnu/include
-isystem /usr/x86_64-pc-linux-gnu/sys-include -fchecking=1 -c -m64 -O3
-march=native -fno-semantic-interposition -mtls-dialect=gnu2
-fdiagnostics-color=always -Wa,-O2 -Wa,-mtune=znver4 -g1 -pipe
-Werror=strict-aliasing -Werror=lto-type-mismatch -Werror=odr
-fdiagnostics-color=always -fdiagnostics-urls=never --param=ggc-min-expand=150
-ggdb3 -fchecking=1 -fcf-protection -gnatpg -gnata -W -Wall -fPIC -nostdinc
-I- -I. -Iada/generated -Iada
-I/var/tmp/portage/sys-devel/gcc-16.0.9999/work/gcc-16.0.9999/gcc/ada
-Iada/libgnat
-I/var/tmp/portage/sys-devel/gcc-16.0.9999/work/gcc-16.0.9999/gcc/ada/libgnat
-Iada/gcc-interface
-I/var/tmp/portage/sys-devel/gcc-16.0.9999/work/gcc-16.0.9999/gcc/ada/gcc-interface
/var/tmp/portage/sys-devel/gcc-16.0.9999/work/gcc-16.0.9999/gcc/ada/exp_dbug.adb
-o ada/exp_dbug.o
/var/tmp/portage/sys-devel/gcc-16.0.9999/work/gcc-16.0.9999/gcc/ada/exp_dbug.adb:
In function ‘Exp_Dbug.Strip_Suffixes’:
/var/tmp/portage/sys-devel/gcc-16.0.9999/work/gcc-16.0.9999/gcc/ada/exp_dbug.adb:1572:4:
error: dominator of 7 should be 31, not 33
during GIMPLE pass: vect
+===========================GNAT BUG DETECTED==============================+
| 16.0.0 20251215 (experimental) 880492a8cb10d046b0162c31c9567c1e72d1be8f
(x86_64-pc-linux-gnu) GCC error:|
| in verify_dominators, at dominance.cc:1194 |
| Error detected around
/var/tmp/portage/sys-devel/gcc-16.0.9999/work/gcc-16.0.9999/gcc/ada/exp_dbug.adb:1572:4|
| Compiling
/var/tmp/portage/sys-devel/gcc-16.0.9999/work/gcc-16.0.9999/gcc/ada/exp_dbug.adb|
| Please submit a bug report; see https://gcc.gnu.org/bugs/ . |
| Use a subject line meaningful to you and us to track the bug. |
| Include the entire contents of this bug box in the report. |
| Include the exact command that you entered. |
| Also include sources listed below. |
+==========================================================================+
Please include these source files with error report
Note that list may not be accurate in some cases,
so please double check that the problem can still
be reproduced with the set of files listed.
Consider also -gnatd.n switch (see debug.adb).
/var/tmp/portage/sys-devel/gcc-16.0.9999/work/gcc-16.0.9999/gcc/ada/gcc-interface/system.ads
/var/tmp/portage/sys-devel/gcc-16.0.9999/work/gcc-16.0.9999/gcc/ada/exp_dbug.adb
/var/tmp/portage/sys-devel/gcc-16.0.9999/work/gcc-16.0.9999/gcc/ada/exp_dbug.ads
/var/tmp/portage/sys-devel/gcc-16.0.9999/work/gcc-16.0.9999/gcc/ada/namet.ads
/var/tmp/portage/sys-devel/gcc-16.0.9999/work/gcc-16.0.9999/gcc/ada/alloc.ads
/var/tmp/portage/sys-devel/gcc-16.0.9999/work/gcc-16.0.9999/gcc/ada/hostparm.ads
/var/tmp/portage/sys-devel/gcc-16.0.9999/work/gcc-16.0.9999/gcc/ada/types.ads
/var/tmp/portage/sys-devel/gcc-16.0.9999/work/gcc-16.0.9999/gcc/ada/libgnat/ada.ads
/var/tmp/portage/sys-devel/gcc-16.0.9999/work/gcc-16.0.9999/gcc/ada/libgnat/a-unccon.ads
/var/tmp/portage/sys-devel/gcc-16.0.9999/work/gcc-16.0.9999/gcc/ada/libgnat/a-uncdea.ads
/var/tmp/portage/sys-devel/gcc-16.0.9999/work/gcc-16.0.9999/gcc/ada/table.ads
/var/tmp/portage/sys-devel/gcc-16.0.9999/work/gcc-16.0.9999/gcc/ada/uintp.ads
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/var/tmp/portage/sys-devel/gcc-16.0.9999/work/gcc-16.0.9999/gcc/ada/urealp.ads
ada/sinfo-nodes.ads
ada/seinfo.ads
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/var/tmp/portage/sys-devel/gcc-16.0.9999/work/gcc-16.0.9999/gcc/ada/libgnat/s-os_lib.ads
/var/tmp/portage/sys-devel/gcc-16.0.9999/work/gcc-16.0.9999/gcc/ada/libgnat/s-string.ads
/var/tmp/portage/sys-devel/gcc-16.0.9999/work/gcc-16.0.9999/gcc/ada/einfo.ads
ada/snames.ads
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ada/einfo-entities.ads
/var/tmp/portage/sys-devel/gcc-16.0.9999/work/gcc-16.0.9999/gcc/ada/einfo-utils.ads
/var/tmp/portage/sys-devel/gcc-16.0.9999/work/gcc-16.0.9999/gcc/ada/debug.ads
/var/tmp/portage/sys-devel/gcc-16.0.9999/work/gcc-16.0.9999/gcc/ada/exp_util.ads
/var/tmp/portage/sys-devel/gcc-16.0.9999/work/gcc-16.0.9999/gcc/ada/exp_tss.ads
/var/tmp/portage/sys-devel/gcc-16.0.9999/work/gcc-16.0.9999/gcc/ada/rtsfind.ads
/var/tmp/portage/sys-devel/gcc-16.0.9999/work/gcc-16.0.9999/gcc/ada/nlists.ads
ada/nmake.ads
/var/tmp/portage/sys-devel/gcc-16.0.9999/work/gcc-16.0.9999/gcc/ada/opt.ads
/var/tmp/portage/sys-devel/gcc-16.0.9999/work/gcc-16.0.9999/gcc/ada/libgnat/s-wchcon.ads
/var/tmp/portage/sys-devel/gcc-16.0.9999/work/gcc-16.0.9999/gcc/ada/sem_aux.ads
/var/tmp/portage/sys-devel/gcc-16.0.9999/work/gcc-16.0.9999/gcc/ada/sem_eval.ads
/var/tmp/portage/sys-devel/gcc-16.0.9999/work/gcc-16.0.9999/gcc/ada/sem_util.ads
/var/tmp/portage/sys-devel/gcc-16.0.9999/work/gcc-16.0.9999/gcc/ada/aspects.ads
/var/tmp/portage/sys-devel/gcc-16.0.9999/work/gcc-16.0.9999/gcc/ada/sinfo-utils.ads
/var/tmp/portage/sys-devel/gcc-16.0.9999/work/gcc-16.0.9999/gcc/ada/stringt.ads
/var/tmp/portage/sys-devel/gcc-16.0.9999/work/gcc-16.0.9999/gcc/ada/tbuild.ads
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/var/tmp/portage/sys-devel/gcc-16.0.9999/work/gcc-16.0.9999/gcc/ada/libgnat/s-conca2.ads
/var/tmp/portage/sys-devel/gcc-16.0.9999/work/gcc-16.0.9999/gcc/ada/libgnat/s-assert.ads
/var/tmp/portage/sys-devel/gcc-16.0.9999/work/gcc-16.0.9999/gcc/ada/libgnat/a-assert.ads
/var/tmp/portage/sys-devel/gcc-16.0.9999/work/gcc-16.0.9999/gcc/ada/libgnat/s-secsta.ads
/var/tmp/portage/sys-devel/gcc-16.0.9999/work/gcc-16.0.9999/gcc/ada/libgnat/s-parame.ads
/var/tmp/portage/sys-devel/gcc-16.0.9999/work/gcc-16.0.9999/gcc/ada/libgnat/s-stoele.ads
/var/tmp/portage/sys-devel/gcc-16.0.9999/work/gcc-16.0.9999/gcc/ada/table.adb
/var/tmp/portage/sys-devel/gcc-16.0.9999/work/gcc-16.0.9999/gcc/ada/libgnat/s-memory.ads
/var/tmp/portage/sys-devel/gcc-16.0.9999/work/gcc-16.0.9999/gcc/ada/libgnat/a-except.ads
/var/tmp/portage/sys-devel/gcc-16.0.9999/work/gcc-16.0.9999/gcc/ada/libgnat/s-traent.ads
raised TYPES.UNRECOVERABLE_ERROR : comperr.adb:422
make[3]: ***
[/var/tmp/portage/sys-devel/gcc-16.0.9999/work/gcc-16.0.9999/gcc/ada/gcc-interface/Make-lang.in:166:
ada/exp_dbug.o] Error 1
make[3]: Leaving directory
'/var/tmp/portage/sys-devel/gcc-16.0.9999/work/build/gcc'
```
```
/var/tmp/portage/sys-devel/gcc-16.0.9999/work/build/gcc # ../prev-gcc/xgcc -v
Using built-in specs.
COLLECT_GCC=../prev-gcc/xgcc
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
aa96c5d4969f2ef43e4841a06a28cffe0c3057fa' --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 --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 16.0.0 20251215 (experimental)
880492a8cb10d046b0162c31c9567c1e72d1be8f (Gentoo Hardened 16.0.9999 p, commit
aa96c5d4969f2ef43e4841a06a28cffe0c3057fa)
```
