https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116330
Bug ID: 116330
Summary: -fcompare-debug -gno-statement-frontiers failure with
-O3 -march=znver3 -mshstk when building qtbase-6.7.2
Product: gcc
Version: 15.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: middle-end
Assignee: unassigned at gcc dot gnu.org
Reporter: sjames at gcc dot gnu.org
Target Milestone: ---
Note that this is from a unity/jumbo build. Unfortunately, disabling it made
the bug go away.
Need `-march=znver3 -mshstk`, see PR116045 for that.
```
$ g++
../qtbase-everywhere-src-6.7.2_build/src/network/CMakeFiles/Network.dir/Unity/unity_1_cxx.cxx.ii
-march=znver3 -mshstk -O3 -fcompare-debug -gno-statement-frontiers -c
g++: error:
../qtbase-everywhere-src-6.7.2_build/src/network/CMakeFiles/Network.dir/Unity/unity_1_cxx.cxx.ii:
‘-fcompare-debug’ failure
```
```
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-pc-linux-gnu/15/lto-wrapper
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-languages=c,c++,fortran --enable-obsolete --enable-secureplt
--disable-werror --with-system-zlib --enable-nls --without-included-gettext
--disable-libunwind-exceptions --enable-checking=yes,extra,rtl,df
--with-bugurl=https://bugs.gentoo.org/ --with-pkgversion='Gentoo 15.0.9999 p,
commit ecc3ba06c22edee6b22d2e8e5e05031d18fa372a' --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 --disable-valgrind-annotations
--disable-vtable-verify --disable-libvtv --with-zstd --without-isl
--enable-default-pie --enable-host-pie --disable-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 15.0.0 20240810 (experimental)
8035619b7313d9503852e1c7c8c06cfddca4d648 (Gentoo 15.0.9999 p, commit
ecc3ba06c22edee6b22d2e8e5e05031d18fa372a)
```
