123 lines
4.5 KiB
Markdown
123 lines
4.5 KiB
Markdown
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# TODO — divergences from upstream Arch
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Every deliberate difference between this port and Arch's own packages, so
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that none of them becomes invisible. A port that does not track what it gave
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up drifts silently, and the gap is discovered years later by whoever needs
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the missing feature.
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Two kinds of entry, and the difference matters:
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- **Deferred** — dropped to get the bootstrap moving. Nothing about s390x
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prevents it; it costs build time, a host dependency, or another package
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first. These should come back.
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- **Architectural** — the thing being dropped is x86-specific by nature.
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There is nothing to restore.
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Each entry names the hook that implements it, so the change is one file away.
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---
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## Deferred
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### libgccjit — `patches/pkgbuild/gcc.sh`
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Arch configures and compiles the **entire gcc tree a second time** just for
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libgccjit, because it needs `--enable-host-shared` and applying that to the
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main compiler would slow it down. That pass is about half of gcc's build
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time — twenty minutes per attempt on this hardware.
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Already re-enablable, no code change needed:
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EL_GCC_JIT=1 bash scripts/build-stage1.sh
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**To close:** run one build with the switch on and confirm the package
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appears. Nothing else is required.
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### HTTP/3 in curl — `patches/pkgbuild/curl.sh`
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configure: error: nghttp3 enabled without a QUIC library; enable ngtcp2
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Ubuntu packages neither ngtcp2 nor nghttp3, so the build host cannot satisfy
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them. pacman talks to plain HTTPS mirrors, and so does ERPLibre.
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**To close:** build `ngtcp2` and `nghttp3` as Arch packages, add them to the
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stage-1 list before curl, then delete the hook.
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### gcc front ends: Ada, D, Modula-2, COBOL — `patches/pkgbuild/gcc.sh`
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configure: error: GNAT is required to build ada
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configure: error: GDC is required to build d
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These are written in themselves and need an existing compiler of the same
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language. Ubuntu ships `gnat`, but not a version GCC 15 accepts; there is no
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D bootstrap compiler here at all.
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**To close:** after stage 2, the port's own gcc can bootstrap them. This is
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the entry most likely to matter to someone — a mainframe shop with Ada is not
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a hypothetical.
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### Test suites — `scripts/bootstrap-pacman.sh` (`--nocheck`)
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Stage-1 suites run against the **host** libraries, not Arch's, so their
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verdict says nothing about the port. `acl` failed its check step on a sound
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build. They also cost hours.
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**To close:** stage 2 runs inside the chroot, where the suites test what was
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actually built. Drop `--nocheck` there.
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### Checksums on generated patches — `scripts/bootstrap-pacman.sh`
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`--skipchecksums`. GitLab regenerates `.patch` URLs, so their checksums drift
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from what the PKGBUILD recorded. Release tarballs still validate — only the
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generated patches are skipped.
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**To close:** fetch patches from a stable source, or record our own sums.
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### PGP signatures — `scripts/bootstrap-pacman.sh`
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`--skippgpcheck`, because no keyring exists yet.
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**To close:** build `archlinux-keyring`, then verify.
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---
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## Architectural
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Nothing to restore here. Listed so nobody spends an afternoon rediscovering
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why.
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| What | Where | Why |
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| SFrame | `glibc.sh` | `configure: error: the architecture doesn't support SFrame` |
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| gold linker | `binutils.sh` | x86-centric, deprecated upstream since 2.44; `ld.bfd` is the linker on Z |
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| 32-bit multilib | `glibc.sh`, `gcc.sh`, `libtool.sh` | On x86_64 it means i686. On Z it means the 31-bit ESA/390 ABI that GCC is removing |
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| `libhwasan` | `gcc.sh` | Hardware-assisted ASan exists on x86_64 and aarch64 only |
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---
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## Environment, not the port
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### libassuan source — `patches/pkgbuild/libassuan.sh`
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`dev.gnupg.org` is unreachable from this build host — measured HTTP 000,
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while `github.com/gpg/libassuan.git` and `gnupg.org/ftp` both answer. Only
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the transport changed; the pinned tag is untouched.
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**To close:** it closes itself on a host with wider outbound access.
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### `arch-meson` / `arch-cmake` — `scripts/devtools/`
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Several PKGBUILDs call them, they ship in `devtools`, and `devtools` is
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itself an Arch package — during a bootstrap they cannot exist yet.
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**To close:** build `devtools` in stage 2 and drop the stand-ins.
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### Host include layout — `scripts/bootstrap-pacman.sh`
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Ubuntu multiarch puts `asm/`, `bits/`, `gnu/` and `sys/sdt.h` under
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`/usr/include/s390x-linux-gnu`, while glibc builds with `-nostdinc` and
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expects the classic layout. Symlinks bridge it.
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**To close:** stage 2 builds inside an Arch root, where the layout is
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already right.
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