No description
Mathieu Benoit
6eb83c91c3
Arch configures and compiles the whole gcc tree a SECOND time just for
libgccjit, because it needs --enable-host-shared and applying that to
the main compiler would slow it down. That pass is about half of gcc's
build time -- twenty minutes per attempt on this hardware -- and
nothing in the bootstrap or in ERPLibre uses it.
It is now skipped by default and restored with:
EL_GCC_JIT=1 bash scripts/build-stage1.sh
Verified both ways: off leaves zero libgccjit references in the
PKGBUILD, on leaves the ten upstream ones untouched, including the
--enable-languages=jit line the main-build sed deliberately avoids.
package_gcc() still manipulated the 32-bit tree in several places, and
each fails once multilib is off because usr/lib32 never exists:
'usr/lib/gcc/s390x-ibm-linux-gnu/16/libatomic.so' -> '../../../libatomic.so'
ln: No such file or directory
The link named in that error is the one that SUCCEEDED; the failure is
the usr/lib32 line right after it in the same loop. Read alone, it
sends you hunting for a missing libatomic that is in fact present. The
same loop also linked the D runtimes, gone with the D front end.
--- FR ---
Arch configure et compile l arbre gcc entier une SECONDE fois pour le
seul libgccjit, qui reclame --enable-host-shared -- appliquer cette
option au compilateur principal le ralentirait. Cette passe represente
environ la moitie du temps de compilation de gcc, soit vingt minutes
par tentative sur cette machine, et rien dans l amorcage ni dans
ERPLibre ne s en sert.
Elle est desormais ecartee par defaut et se retablit par :
EL_GCC_JIT=1 bash scripts/build-stage1.sh
Verifie dans les deux sens : desactive, il ne reste aucune reference a
libgccjit dans le PKGBUILD ; active, les dix references amont restent
intactes, y compris la ligne --enable-languages=jit que le sed du
build principal evite deliberement.
package_gcc() manipulait encore l arbre 32 bits en plusieurs endroits,
et chacun echoue une fois le multilib retire, puisque usr/lib32
n existe jamais :
'usr/lib/gcc/s390x-ibm-linux-gnu/16/libatomic.so' -> '../../../libatomic.so'
ln: No such file or directory
Le lien nomme dans cette erreur est celui qui a REUSSI ; l echec est la
ligne usr/lib32 juste apres, dans la meme boucle. Lue seule, elle fait
chercher un libatomic manquant qui est pourtant bien la. La meme boucle
liait aussi les runtimes D, partis avec le frontal D.
Assisted-by: Claude Opus 5
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| .github/workflows | ||
| arch-kernel | ||
| boot | ||
| patches | ||
| scripts | ||
| .env.example | ||
| .gitignore | ||
| CODEOWNERS | ||
| Containerfile | ||
| LICENSE | ||
| Makefile | ||
| README.md | ||
Arch Linux s390x
A port of Arch Linux to IBM s390x mainframe architecture with systemd support.
Boots a full Arch Linux system on IBM mainframes (or QEMU s390x emulation) using a hybrid build: cross-compilation for the kernel, native s390x compilation on z/VM for userspace.
Quick Start
make container # build dev container (first time)
cp .env.example .env # configure z/VM access
make all # build kernel + initramfs + systemd
make test-systemd # boot it
What Works
- Arch Linux kernel 6.18.6-arch1 with Arch patches, cross-compiled
- Initramfs via modified mkinitcpio
- Static busybox built natively on z/VM, 2.3MB
- Root filesystem with ext4, switch_root to real rootfs
- Systemd as PID 1
Pacman, bash, and GNU coreutils are not yet ported.
Build System
The build uses two tiers:
Cross-compilation (x86_64 host): Kernel is built in a Fedora 43 container with s390x-linux-gnu-gcc. Initramfs is generated with a patched mkinitcpio that handles cross-architecture binary injection.
Native compilation (s390x z/VM): Busybox and systemd must be built on real s390x hardware. The z/VM system runs RHEL 9.6 with GCC 11.5.0. Scripts handle SSH deployment and retrieval automatically via .env configuration.