[Bug target/113915] [14 regression] glibc miscompiled for armv7a since r14-4365-g0731889c026bfe

["sjames at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113915

--- Comment #3 from Sam James <sjames at gcc dot gnu.org> ---
On glibc trunk (491e55beab7457ed310a4a47496f4a333c5d1032), I can reproduce
with:
```
CC=/tmp/gcc/bin/gcc CXX=/tmp/gcc/bin/g++ ~/git/glibc/configure --prefix=/usr
make -j$(nproc)
make test t=posix/tst-getopt-cancel
```

```
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/armv7a-unknown-linux-gnueabihf/14/lto-wrapper
Target: armv7a-unknown-linux-gnueabihf
Configured with:
/var/tmp/portage/sys-devel/gcc-14.0.1_pre20240204-r1/work/gcc-14-20240204/configure
--host=armv7a-unknown-linux-gnueabihf --build=armv7a-unknown-linux-gnueabihf
--prefix=/usr --bindir=/usr/armv7a-unknown-linux-gnueabihf/gcc-bin/14
--includedir=/usr/lib/gcc/armv7a-unknown-linux-gnueabihf/14/include
--datadir=/usr/share/gcc-data/armv7a-unknown-linux-gnueabihf/14
--mandir=/usr/share/gcc-data/armv7a-unknown-linux-gnueabihf/14/man
--infodir=/usr/share/gcc-data/armv7a-unknown-linux-gnueabihf/14/info
--with-gxx-include-dir=/usr/lib/gcc/armv7a-unknown-linux-gnueabihf/14/include/g++-v14
--disable-silent-rules --disable-dependency-tracking
--with-python-dir=/share/gcc-data/armv7a-unknown-linux-gnueabihf/14/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
--with-bugurl=https://bugs.gentoo.org/ --with-pkgversion='Gentoo
14.0.1_pre20240204-r1 p20' --with-gcc-major-version-only
--enable-libstdcxx-time --enable-lto --disable-libstdcxx-pch --enable-shared
--enable-threads=posix --enable-__cxa_atexit --enable-clocale=gnu
--disable-multilib --disable-fixed-point --with-float=hard --with-arch=armv7-a
--with-float=hard --with-fpu=vfpv3-d16 --enable-libgomp --disable-libssp
--disable-libada --disable-cet --disable-systemtap
--disable-valgrind-annotations --disable-vtable-verify --disable-libvtv
--without-zstd --without-isl --enable-default-pie --enable-host-pie
--disable-host-bind-now --enable-default-ssp
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 14.0.1 20240204 (experimental) (Gentoo 14.0.1_pre20240204-r1 p20)
```