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feat(buildmeta): add CompatArches and universal binary arch types

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CompatArches returns what a given OS+arch can execute — OS-level
facts like Rosetta 2 (darwin arm64 runs x86_64), Windows ARM
emulation, and x86-64 micro-arch backward compat. Also adds
ArchUniversal1 (PPC+x86) and ArchUniversal2 (x86_64+ARM64).

Per-package/per-version overrides (libc compat, nonstandard naming)
remain the installer config's responsibility.
This commit is contained in:
AJ ONeal
2026-03-09 21:57:43 -06:00
parent 1253fcd671
commit 5dba2de20b
1 changed files with 43 additions and 0 deletions
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43
internal/buildmeta/buildmeta.go
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@@ -43,6 +43,10 @@ const (
ArchS390X Arch = "s390x"
ArchMIPS64 Arch = "mips64"
ArchMIPS Arch = "mips"
// Universal (fat) binary architectures for macOS.
ArchUniversal1 Arch = "universal1" // PPC + x86 (Rosetta 1 era)
ArchUniversal2 Arch = "universal2" // x86_64 + ARM64 (Rosetta 2 era)
)
// Libc represents the C library a binary is linked against.
@@ -102,3 +106,42 @@ func (t Target) Triplet() string {
return string(t.OS) + "-" + string(t.Arch) + "-" + string(t.Libc)
}
// CompatArches returns the architectures that the given OS+arch
// combination can execute, ordered from most specific to least.
// The input arch is always first.
//
// These are OS-level facts (hardware + translation layer), not
// package-specific. Per-package overrides belong in installer config.
func CompatArches(os OS, arch Arch) []Arch {
switch os {
case OSDarwin:
switch arch {
case ArchARM64:
// Rosetta 2: Apple Silicon runs x86_64 binaries.
return []Arch{ArchARM64, ArchUniversal2, ArchAMD64}
case ArchAMD64:
return []Arch{ArchAMD64, ArchUniversal2, ArchX86}
}
case OSWindows:
switch arch {
case ArchARM64:
// Windows on ARM emulates x86_64 and x86.
return []Arch{ArchARM64, ArchAMD64, ArchX86}
}
}
// Micro-architecture fallbacks (universal across all OSes).
switch arch {
case ArchAMD64v4:
return []Arch{ArchAMD64v4, ArchAMD64v3, ArchAMD64v2, ArchAMD64}
case ArchAMD64v3:
return []Arch{ArchAMD64v3, ArchAMD64v2, ArchAMD64}
case ArchAMD64v2:
return []Arch{ArchAMD64v2, ArchAMD64}
case ArchARMv7:
return []Arch{ArchARMv7, ArchARMv6}
}
return []Arch{arch}
}