Mathieu Benoit
c9cc17bd01
The same x86 assumption keeps returning in a different disguise: a 32-bit multilib split package. libtool had it, and so do glibc and gcc. On x86_64 multilib means i686 and Arch wants it; on Z it means the 31-bit ESA/390 ABI that GCC is actively removing: configure: error: Support for -m31 is deprecated and will be removed. glibc is the clearest case. The whole compile SUCCEEDS and the glibc package is written -- then makepkg aborts in package_lib32-glibc() with "No rule to make target install", because the 32-bit tree was never configured. The work was done; only the packaging of a tree nobody built failed. gcc needed three cuts: front ends written in themselves (Ada, D, Modula-2, COBOL have no bootstrap compiler here), multilib, and every lib32 reference including the _pick lines that split out usr/lib32. arch-meson and arch-cmake are provided as stand-ins. Several PKGBUILDs call them, they ship in devtools, and devtools is itself an Arch package -- so during a bootstrap they cannot exist yet and every PKGBUILD using them stops on "command not found". A verification lesson, learned twice: grepping a whole PKGBUILD for "lib32" declares false failures, because the string survives in comments and in functions that are never called. Only the pkgname array matters, since that is what makepkg iterates. --- FR --- La meme hypothese x86 revient sans cesse sous un autre deguisement : un paquet scinde multilib 32 bits. libtool l avait, glibc et gcc aussi. Sur x86_64 le multilib signifie i686 et Arch le veut ; sur Z il designe l ABI 31 bits ESA/390 que GCC est en train de retirer. glibc est le cas le plus net. Toute la compilation REUSSIT et le paquet glibc est ecrit -- puis makepkg abandonne dans package_lib32-glibc() sur « No rule to make target install », parce que l arbre 32 bits n a jamais ete configure. Le travail etait fait ; seul l empaquetage d un arbre que personne n avait bati a echoue. gcc demandait trois coupes : les frontaux ecrits en eux-memes (Ada, D, Modula-2 et COBOL n ont ici aucun compilateur d amorcage), le multilib, et toute reference a lib32 y compris les lignes _pick qui extraient usr/lib32. arch-meson et arch-cmake sont fournis en substituts. Plusieurs PKGBUILD les appellent, ils vivent dans devtools, et devtools est lui-meme un paquet Arch -- pendant un amorcage ils ne peuvent donc pas exister, et chaque PKGBUILD qui les utilise s arrete sur « command not found ». Une lecon de verification, apprise deux fois : chercher « lib32 » dans tout un PKGBUILD declare de faux echecs, car la chaine survit dans les commentaires et dans des fonctions jamais appelees. Seul le tableau pkgname compte, puisque c est lui que makepkg parcourt. Assisted-by: Claude Opus 5
79 lines
3.4 KiB
Bash
Executable file
79 lines
3.4 KiB
Bash
Executable file
#!/usr/bin/env bash
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# gcc: three x86 assumptions, all fatal on s390x.
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#
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# 1. Front ends written in themselves.
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#
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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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#
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# Ada and D need an existing compiler of the same language; Modula-2 and
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# COBOL have the same shape. Nothing in a core bootstrap, and nothing in
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# ERPLibre, is written in any of them.
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#
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# 2. Multilib, which on Z means the 31-bit ABI:
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#
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# configure: error: Support for -m31 is deprecated and will be removed.
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# Specify --enable-obsolete to build it anyway.
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#
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# On x86_64 multilib means i686 and Arch wants it. Here it means the
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# 31-bit ESA/390 ABI that GCC is actively removing. Disabled rather than
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# resurrected as obsolete.
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#
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# 3. The lib32 split package and every _pick that feeds it.
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#
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# The front-end reduction is a STAGE 1 CONCESSION: once the port is
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# self-hosting, its own gcc can bootstrap Ada and D. The multilib and lib32
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# removals are permanent -- they are architectural.
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set -euo pipefail
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sed -i 's/^\(\s*--enable-languages=\).*\\$/\1c,c++,fortran,lto,objc,obj-c++ \\/' PKGBUILD
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if grep -qE 'enable-languages=[^ ]*(ada|,d,|m2|cobol)' PKGBUILD; then
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echo "gcc: a self-hosted front end is still enabled" >&2; exit 1
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fi
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if grep -q -- '--enable-multilib' PKGBUILD; then
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sed -i 's/--enable-multilib/--disable-multilib/' PKGBUILD
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else
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sed -i 's/^\(\s*\)--enable-languages=\(.*\)$/\1--disable-multilib \\\n\1--enable-languages=\2/' PKGBUILD
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fi
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grep -q -- '--disable-multilib' PKGBUILD || { echo "gcc: multilib not disabled" >&2; exit 1; }
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# The pkgname array lists one sub-package per front end. makepkg calls
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# package_<name>() for every entry, so those whose language is now off would
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# package an empty tree. Names absent from the array are never called, so
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# pruning it is enough -- the functions themselves can stay.
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python3 - <<'PY'
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import io, re
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drop = {
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"gcc-ada", "gcc-d", "gcc-gcobol", "gcc-go", "gcc-m2", "gcc-rust",
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"libgm2", "libgo", "libgphobos", "libgcobol",
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"lib32-gcc-libs",
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# Hardware-assisted ASan exists on x86_64 and aarch64 only.
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"libhwasan",
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}
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s = io.open("PKGBUILD", encoding="utf-8").read()
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m = re.search(r"^pkgname=\(\n(.*?)^\)$", s, re.S | re.M)
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assert m, "pkgname array not found"
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kept = [ln for ln in m.group(1).splitlines() if ln.strip() not in drop]
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s = s[:m.start(1)] + "\n".join(kept) + "\n" + s[m.end(1):]
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s = re.sub(r"\npackage_lib32-gcc-libs\(\)\s*\{.*?\n\}\n", "\n", s, flags=re.S)
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io.open("PKGBUILD", "w", encoding="utf-8").write(s)
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print("gcc: sub-packages kept -> %d" % len(kept))
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PY
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# Two lingering references outside the array: a makedepends entry on a
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# package that does not exist for this architecture, and a run of
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# `_pick lib32-gcc-libs usr/lib32/...` splitting out files multilib would
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# have produced. With multilib off, usr/lib32 is empty.
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sed -i '/^\s*lib32-gcc-libs\s*$/d' PKGBUILD
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sed -i '/_pick lib32-gcc-libs/d' PKGBUILD
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sed -i '/lib32-gcc-libs: for generating code/d' PKGBUILD
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# Verify what matters: the array makepkg iterates. Grepping the whole file
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# for the bare name declared a false failure once already, on libtool and
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# then here -- the string survives in comments and in unused functions.
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if sed -n '/^pkgname=(/,/^)/p' PKGBUILD | grep -q 'lib32'; then
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echo "gcc: lib32 still in pkgname array" >&2; exit 1
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fi
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grep -m1 -- '--enable-languages' PKGBUILD
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echo "gcc: front ends reduced, multilib off, lib32 removed"
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