Failed to compile dev-python/numpy on ppc64 (POWER9)

Message

bernies · Post by **bernies** » Tue Mar 10, 2026 8:16 am

I'm getting this error when building dev-python/numpy:

FAILED: [code=1] numpy/_core/libhighway_qsort_16bit.dispatch.h_VSX2.a.p/src_npysort_highway_qsort_16bit.dispatch.cpp.o 
powerpc64le-unknown-linux-gnu-g++ -Inumpy/_core/libhighway_qsort_16bit.dispatch.h_VSX2.a.p -Inumpy/_core -I../numpy-2.3.2/numpy/_core -Inumpy/_core/include -I../numpy-2.3.2/numpy/_core/include -I../numpy-2.3.2/numpy/_core/src/common -I../numpy-2.3.2/numpy/_core/src/multiarray -I../numpy-2.3.2/numpy/_core/src/npymath -I../numpy-2.3.2/numpy/_core/src/umath -I../numpy-2.3.2/numpy/_core/src/highway -I/usr/include/python3.13 -I/var/tmp/portage/dev-python/numpy-2.3.2/work/numpy-2.3.2-python3_13/meson_cpu -fdiagnostics-color=always -Wall -Winvalid-pch -std=c++17 -mcpu=power9 -DNPY_HAVE_VSX -DNPY_HAVE_VSX_ASM -DNPY_HAVE_VSX3 -DNPY_HAVE_VSX3_HALF_DOUBLE -O2 -pipe -mcpu=power9 -mtune=power9 -mvsx -fno-strict-aliasing -DNDEBUG -fPIC -DNPY_INTERNAL_BUILD -DHAVE_NPY_CONFIG_H -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE=1 -D_LARGEFILE64_SOURCE=1 -fno-exceptions -fno-rtti -O3 -DNPY_HAVE_VSX2 -mcpu=power8 -DNPY_MTARGETS_CURRENT=VSX2 -MD -MQ numpy/_core/libhighway_qsort_16bit.dispatch.h_VSX2.a.p/src_npysort_highway_qsort_16bit.dispatch.cpp.o -MF numpy/_core/libhighway_qsort_16bit.dispatch.h_VSX2.a.p/src_npysort_highway_qsort_16bit.dispatch.cpp.o.d -o numpy/_core/libhighway_qsort_16bit.dispatch.h_VSX2.a.p/src_npysort_highway_qsort_16bit.dispatch.cpp.o -c ../numpy-2.3.2/numpy/_core/src/npysort/highway_qsort_16bit.dispatch.cpp
In file included from ../numpy-2.3.2/numpy/_core/src/common/common.hpp:10,
                 from ../numpy-2.3.2/numpy/_core/src/npysort/highway_qsort.hpp:4,
                 from ../numpy-2.3.2/numpy/_core/src/npysort/highway_qsort_16bit.dispatch.cpp:5:
../numpy-2.3.2/numpy/_core/src/common/half.hpp: In member function ‘np::Half::operator float() const’:
../numpy-2.3.2/numpy/_core/src/common/half.hpp:95:54: error: ‘__builtin_vsx_vextract_fp_from_shorth’ requires the ‘-mcpu=power9’ and ‘-mvsx’ options
   95 |         return vec_extract(vec_extract_fp_from_shorth(vec_splats(bits_)), 0);
      |                                                      ^

According to the error message, I'm missing one or both of `-mcpu=power9` and `-mvsx`. However, you can see from the command that these flags are set. What's curious though, is the command also has `-mcpu=power8`. This is not in my configuration files, neither is `-O3` (I've set `-O2` in make.conf). Where is that coming from, and what should I do to resolve this issue?
More information, as suggested:

Code: Select all

$ emerge --info '=dev-python/numpy-2.3.2::gentoo'
Portage 3.0.77 (python 3.13.11-final-0, default/linux/ppc64le/23.0/desktop/gnome/systemd, gcc-15, glibc-2.42-r5, 6.18.12-gentoo-4k_page_size ppc64le)
=================================================================
                         System Settings
=================================================================
System uname: Linux-6.18.12-gentoo-4k_page_size-ppc64le-POWER9_-raw-,_altivec_supported-with-glibc2.42
KiB Mem:    65536444 total,  58611276 free
KiB Swap:    7813116 total,   7813116 free
Timestamp of repository gentoo: Thu, 05 Mar 2026 01:00:00 +0000
Head commit of repository gentoo: 35157059965896ecc60971e96b5116078d2cf54c
sh bash 5.3_p9
ld GNU ld (Gentoo 2.45.1 p1) 2.45.1
app-misc/pax-utils:        1.3.10::gentoo
app-shells/bash:           5.3_p9::gentoo
dev-build/autoconf:        2.72-r6::gentoo
dev-build/automake:        1.18.1::gentoo
dev-build/cmake:           4.1.4::gentoo
dev-build/libtool:         2.5.4::gentoo
dev-build/make:            4.4.1-r102::gentoo
dev-build/meson:           1.9.2::gentoo
dev-java/java-config:      2.3.4::gentoo
dev-lang/perl:             5.42.0-r1::gentoo
dev-lang/python:           3.13.11::gentoo, 3.14.2::gentoo
dev-lang/rust-bin:         1.90.0::gentoo, 1.92.0::gentoo
llvm-core/clang:           20.1.8::gentoo, 21.1.8::gentoo
llvm-core/lld:             20.1.8::gentoo
llvm-core/llvm:            20.1.8::gentoo, 21.1.8::gentoo
sys-apps/baselayout:       2.18::gentoo
sys-apps/sandbox:          2.46::gentoo
sys-apps/systemd:          258.3::gentoo
sys-devel/binutils:        2.45.1::gentoo
sys-devel/binutils-config: 5.6::gentoo
sys-devel/gcc:             15.2.1_p20260214::gentoo
sys-devel/gcc-config:      2.12.2::gentoo
sys-kernel/linux-headers:  6.18::gentoo (virtual/os-headers)
sys-libs/glibc:            2.42-r5::gentoo
Repositories:

gentoo
    location: /var/db/repos/gentoo
    sync-type: rsync
    sync-uri: rsync://rsync.gentoo.org/gentoo-portage
    priority: -1000
    volatile: False
    sync-rsync-verify-metamanifest: yes
    sync-rsync-verify-max-age: 3
    sync-rsync-extra-opts: 
    sync-rsync-verify-jobs: 1

Binary Repositories:

gentoobinhost
    location: /var/cache/binhost/gentoobinhost
    priority: 1
    sync-uri: https://gentoo.osuosl.org/releases/ppc/binpackages/23.0/power9le
    verify-signature: None

ACCEPT_KEYWORDS="ppc64"
ACCEPT_LICENSE="@FREE"
CBUILD="powerpc64le-unknown-linux-gnu"
CFLAGS="-O2 -pipe -mcpu=power9 -mtune=power9"
CHOST="powerpc64le-unknown-linux-gnu"
CONFIG_PROTECT="/etc /usr/share/config"
CONFIG_PROTECT_MASK="/etc/ca-certificates.conf /etc/dconf /etc/env.d /etc/fonts/fonts.conf /etc/gconf /etc/gentoo-release /etc/revdep-rebuild /etc/sandbox.d"
CXXFLAGS="-O2 -pipe -mcpu=power9 -mtune=power9"
DISTDIR="/var/cache/distfiles"
ENV_UNSET="CARGO_HOME DBUS_SESSION_BUS_ADDRESS DISPLAY GDK_PIXBUF_MODULE_FILE GOBIN GOPATH PERL5LIB PERL5OPT PERLPREFIX PERL_CORE PERL_MB_OPT PERL_MM_OPT XAUTHORITY XDG_CACHE_HOME XDG_CONFIG_HOME XDG_DATA_HOME XDG_RUNTIME_DIR XDG_STATE_HOME"
FCFLAGS="-O2 -pipe -mcpu=power9 -mtune=power9"
FEATURES="assume-digests binpkg-docompress binpkg-dostrip binpkg-logs binpkg-multi-instance buildpkg-live compress-index config-protect-if-modified distlocks ebuild-locks fixlafiles ipc-sandbox merge-sync merge-wait multilib-strict network-sandbox news parallel-fetch pid-sandbox pkgdir-index-trusted preserve-libs protect-owned qa-unresolved-soname-deps sandbox strict unknown-features-warn unmerge-logs unmerge-orphans userfetch userpriv usersandbox usersync xattr"
FFLAGS="-O2 -pipe -mcpu=power9 -mtune=power9"
GENTOO_MIRRORS="https://mirror.aarnet.edu.au/pub/gentoo/     http://mirror.aarnet.edu.au/pub/gentoo/     rsync://mirror.aarnet.edu.au/pub/gentoo/     ftp://ftp.swin.edu.au/gentoo     http://ftp.swin.edu.au/gentoo"
LANG="en_AU.utf8"
LDFLAGS="-Wl,-O1 -Wl,--as-needed"
LEX="flex"
LINGUAS="en"
PKGDIR="/var/cache/binpkgs"
PORTAGE_COMPRESS="bzip2"
PORTAGE_CONFIGROOT="/"
PORTAGE_RSYNC_OPTS="--recursive --links --safe-links --perms --times --omit-dir-times --compress --force --whole-file --delete --stats --human-readable --timeout=180 --exclude=/distfiles --exclude=/local --exclude=/packages --exclude=/.git"
PORTAGE_TMPDIR="/var/tmp"
SHELL="/bin/bash"
USE="X a52 aac acl alsa avif bluetooth branding bzip2 cairo cdda cdr colord crypt cups dbus dri dts dvd dvdr eds encode evo exif flac gdbm gdk-pixbuf gif gnome gnome-keyring gnome-online-accounts gnome-shell gpm gstreamer gtk gui iconv icu introspection ipv6 jpeg jpegxl keyring lcms libnotify lm-sensors mad mng mp3 mp4 mpeg nautilus ncurses networkmanager nls ogg opengl openmp pam pango pcre pdf pipewire png policykit ppc64 ppds pulseaudio qml qt6 readline screencast sdl seccomp sound spell ssl startup-notification svg systemd test-rust tiff tracker truetype udev udisks unicode upower usb vorbis vulkan wayland webp wxwidgets x264 xattr xcb xft xml xv xvid zlib" ADA_TARGET="gcc_15" APACHE2_MODULES="authn_core authz_core socache_shmcb unixd actions alias auth_basic authn_anon authn_dbm authn_file authz_dbm authz_groupfile authz_host authz_owner authz_user autoindex cache cgi cgid dav dav_fs dav_lock deflate dir env expires ext_filter file_cache filter headers include info log_config logio mime mime_magic negotiation rewrite setenvif speling status unique_id userdir usertrack vhost_alias" CALLIGRA_FEATURES="karbon sheets words" COLLECTD_PLUGINS="df interface irq load memory rrdtool swap syslog" CPU_FLAGS_PPC="altivec vsx vsx2 vsx3" ELIBC="glibc" GPSD_PROTOCOLS="ashtech aivdm earthmate evermore fv18 garmin garmintxt gpsclock greis isync itrax navcom oncore skytraq superstar2 tsip tripmate tnt" GUILE_SINGLE_TARGET="3-0" GUILE_TARGETS="3-0" INPUT_DEVICES="libinput" KERNEL="linux" LCD_DEVICES="bayrad cfontz glk hd44780 lb216 lcdm001 mtxorb text" LLVM_TARGETS="PowerPC" LUA_SINGLE_TARGET="lua5-1" LUA_TARGETS="lua5-1" OFFICE_IMPLEMENTATION="libreoffice" PHP_TARGETS="php8-3" POSTGRES_TARGETS="postgres17" PYTHON_SINGLE_TARGET="python3_13" PYTHON_TARGETS="python3_13" RUBY_TARGETS="ruby32 ruby33" VIDEO_CARDS="nouveau" XTABLES_ADDONS="quota2 psd pknock lscan length2 ipv4options ipp2p iface geoip fuzzy condition tarpit sysrq proto logmark ipmark dhcpmac delude chaos account"
Unset:  ADDR2LINE, AR, ARFLAGS, AS, ASFLAGS, CC, CCLD, CONFIG_SHELL, CPP, CPPFLAGS, CTARGET, CXX, CXXFILT, ELFEDIT, EMERGE_DEFAULT_OPTS, EXTRA_ECONF, F77FLAGS, FC, GCOV, GPROF, INSTALL_MASK, LC_ALL, LD, LFLAGS, LIBTOOL, MAKE, MAKEFLAGS, MAKEOPTS, NM, OBJCOPY, OBJDUMP, PORTAGE_BINHOST, PORTAGE_BUNZIP2_COMMAND, PORTAGE_COMPRESS_FLAGS, PORTAGE_RSYNC_EXTRA_OPTS, PYTHONPATH, RANLIB, READELF, RUSTFLAGS, SIZE, STRINGS, STRIP, YACC, YFLAGS

Code: Select all

$ emerge -pqv '=dev-python/numpy-2.3.2::gentoo'
[ebuild  N    ] dev-python/numpy-2.3.2  USE="lapack (-big-endian) -debug -test" PYTHON_TARGETS="python3_13 (-pypy3_11) -python3_11 -python3_12 -python3_14"