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Fix Windows build: exclude CZlib where system zlib is absent #9

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Merged
powerje merged 1 commit into from
Jun 29, 2026
Merged

Fix Windows build: exclude CZlib where system zlib is absent #9

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10 changes: 7 additions & 3 deletions Package.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -8,8 +8,12 @@ var products: [Product] = [
]

var targets: [Target] = [
// Thin C wrapper exposing system zlib to Swift.
// zlib is present on macOS (SDK) and Linux (Swift toolchain dependency).
// Thin C wrapper exposing system zlib to Swift. The dependency below is gated to the
// platforms we build for and know ship zlib (macOS SDK, Linux toolchain). A platform
// condition is evaluated against the build *destination*, so this stays correct under
// cross-compilation — unlike a manifest `#if os(...)`, which keys off the host. On
// any other destination (Windows, wasm) CZlib drops out of the graph and the
// `#if canImport(CZlib)`-guarded MCCP compression compiles out.
.target(
name: "CZlib",
path: "Sources/CZlib",
Expand All @@ -20,7 +24,7 @@ var targets: [Target] = [
.target(
name: "MTHCore",
dependencies: [
"CZlib",
.target(name: "CZlib", condition: .when(platforms: [.macOS, .linux])),
],
path: "Sources/SwiftMTHCore"
),
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