Add WASI platform conditions for libc imports and word size (#776)

* Add `import WASILibc` statements to libc import chains

* Declare wasm32 arch as 32-bit environment

* Switch to _pointerBitWidth for architecture checks

This change switches the architecture checks in Data.swift to use the
_pointerBitWidth instead of the arch() checks for consistency with newer
platforms.

Author: kateinoigakukun

Sources/FoundationEssentials/Calendar/Calendar.swift

@@ -18,6 +18,8 @@ import Android
 import Glibc
 #elseif canImport(CRT)
 import CRT
+#elseif os(WASI)
+import WASILibc
 #endif
 
 #if FOUNDATION_FRAMEWORK

Sources/FoundationEssentials/Calendar/Calendar_Gregorian.swift

@@ -18,6 +18,8 @@ import Android
 import Glibc
 #elseif canImport(CRT)
 import CRT
+#elseif os(WASI)
+import WASILibc
 #endif
 
 

Sources/FoundationEssentials/Data/Data+Reading.swift

@@ -25,6 +25,8 @@ import Glibc
 #elseif os(Windows)
 import CRT
 import WinSDK
+#elseif os(WASI)
+import WASILibc
 #endif
 
 func _fgetxattr(_ fd: Int32, _ name: UnsafePointer<CChar>!, _ value: UnsafeMutableRawPointer!, _ size: Int, _ position: UInt32, _ options: Int32) -> Int {

Sources/FoundationEssentials/Data/Data+Writing.swift

@@ -27,6 +27,8 @@ import Glibc
 #elseif os(Windows)
 import CRT
 import WinSDK
+#elseif os(WASI)
+import WASILibc
 #endif
 
 #if !NO_FILESYSTEM

Sources/FoundationEssentials/Data/Data.swift

@@ -76,6 +76,8 @@ import Glibc
 import Musl
 #elseif canImport(ucrt)
 import ucrt
+#elseif canImport(WASILibc)
+import WASILibc
 #endif
 
 #if os(Windows)
@@ -580,11 +582,11 @@ public struct Data : Equatable, Hashable, RandomAccessCollection, MutableCollect
     @usableFromInline
     @frozen
     internal struct InlineData : Sendable {
-#if arch(x86_64) || arch(arm64) || arch(s390x) || arch(powerpc64) || arch(powerpc64le)
+#if _pointerBitWidth(_64)
         @usableFromInline typealias Buffer = (UInt8, UInt8, UInt8, UInt8, UInt8, UInt8, UInt8, UInt8,
                                               UInt8, UInt8, UInt8, UInt8, UInt8, UInt8) //len  //enum
         @usableFromInline var bytes: Buffer
-#elseif arch(i386) || arch(arm) || arch(arm64_32)
+#elseif _pointerBitWidth(_32)
         @usableFromInline typealias Buffer = (UInt8, UInt8, UInt8, UInt8,
                                               UInt8, UInt8) //len  //enum
         @usableFromInline var bytes: Buffer
@@ -615,9 +617,9 @@ public struct Data : Equatable, Hashable, RandomAccessCollection, MutableCollect
         @inlinable // This is @inlinable as a trivial initializer.
         init(count: Int = 0) {
             assert(count <= MemoryLayout<Buffer>.size)
-#if arch(x86_64) || arch(arm64) || arch(s390x) || arch(powerpc64) || arch(powerpc64le)
+#if _pointerBitWidth(_64)
             bytes = (UInt8(0), UInt8(0), UInt8(0), UInt8(0), UInt8(0), UInt8(0), UInt8(0), UInt8(0), UInt8(0), UInt8(0), UInt8(0), UInt8(0), UInt8(0), UInt8(0))
-#elseif arch(i386) || arch(arm) || arch(arm64_32)
+#elseif _pointerBitWidth(_32)
             bytes = (UInt8(0), UInt8(0), UInt8(0), UInt8(0), UInt8(0), UInt8(0))
 #else
     #error ("Unsupported architecture: initialization for Buffer is required for this architecture")
@@ -802,9 +804,9 @@ public struct Data : Equatable, Hashable, RandomAccessCollection, MutableCollect
         }
     }
 
-#if arch(x86_64) || arch(arm64) || arch(s390x) || arch(powerpc64) || arch(powerpc64le)
+#if _pointerBitWidth(_64)
     @usableFromInline internal typealias HalfInt = Int32
-#elseif arch(i386) || arch(arm) || arch(arm64_32)
+#elseif _pointerBitWidth(_32)
     @usableFromInline internal typealias HalfInt = Int16
 #else
     #error ("Unsupported architecture: a definition of half of the pointer sized Int needs to be defined for this architecture")

Sources/FoundationEssentials/Date.swift

@@ -18,6 +18,8 @@ import Bionic
 import Glibc
 #elseif canImport(WinSDK)
 import WinSDK
+#elseif os(WASI)
+import WASILibc
 #endif
 
 #if !FOUNDATION_FRAMEWORK

Sources/FoundationEssentials/Decimal/Decimal+Math.swift

@@ -18,6 +18,8 @@ import Android
 import Glibc
 #elseif canImport(CRT)
 import CRT
+#elseif os(WASI)
+import WASILibc
 #endif
 
 private let powerOfTen: [Decimal.VariableLengthInteger] = [

Sources/FoundationEssentials/Error/CocoaError+FilePath.swift

@@ -22,6 +22,8 @@ import Glibc
 #elseif os(Windows)
 import CRT
 import WinSDK
+#elseif os(WASI)
+import WASILibc
 #endif
 
 extension CocoaError.Code {

Sources/FoundationEssentials/Error/ErrorCodes+POSIX.swift

@@ -19,6 +19,8 @@
 #elseif os(Windows)
 import CRT
 import WinSDK
+#elseif os(WASI)
+import WASILibc
 #endif
 
 #if FOUNDATION_FRAMEWORK

Sources/FoundationEssentials/FileManager/FileManager+Basics.swift

@@ -19,6 +19,8 @@ import Glibc
 #elseif os(Windows)
 import CRT
 import WinSDK
+#elseif os(WASI)
+import WASILibc
 #endif
 
 #if os(Windows)

Sources/FoundationEssentials/FileManager/FileManager+Directories.swift

@@ -26,6 +26,8 @@ import Glibc
 #elseif os(Windows)
 import CRT
 import WinSDK
+#elseif os(WASI)
+import WASILibc
 #endif
 
 internal import _FoundationCShims

Sources/FoundationEssentials/FileManager/FileManager+Files.swift

@@ -26,6 +26,9 @@ internal import _FoundationCShims
 #elseif os(Windows)
 import CRT
 import WinSDK
+#elseif os(WASI)
+internal import _FoundationCShims
+import WASILibc
 #endif
 
 extension Date {

Sources/FoundationEssentials/FileManager/FileManager+SymbolicLinks.swift

@@ -21,6 +21,8 @@ import Glibc
 import CRT
 import WinSDK
 internal import _FoundationCShims
+#elseif os(WASI)
+import WASILibc
 #endif
 
 extension _FileManagerImpl {

Sources/FoundationEssentials/FileManager/FileManager+Utilities.swift

@@ -31,6 +31,8 @@ internal import _FoundationCShims
 #elseif os(Windows)
 import CRT
 import WinSDK
+#elseif os(WASI)
+import WASILibc
 #endif
 
 #if os(Windows)

Sources/FoundationEssentials/FileManager/FileOperations.swift

@@ -19,6 +19,8 @@ import Glibc
 #elseif os(Windows)
 import CRT
 import WinSDK
+#elseif os(WASI)
+import WASILibc
 #endif
 
 #if FOUNDATION_FRAMEWORK

Sources/FoundationEssentials/Formatting/BinaryInteger+NumericStringRepresentation.swift

@@ -18,6 +18,8 @@ import Android
 import Glibc
 #elseif os(Windows)
 import CRT
+#elseif os(WASI)
+import WASILibc
 #endif
 
 // MARK: - BinaryInteger + Numeric string representation

Sources/FoundationEssentials/ProcessInfo/ProcessInfo.swift

@@ -21,6 +21,8 @@ import unistd
 import Glibc
 #elseif os(Windows)
 import WinSDK
+#elseif os(WASI)
+import WASILibc
 #endif
 
 #if !NO_PROCESS

Sources/FoundationEssentials/PropertyList/OpenStepPlist.swift

@@ -16,6 +16,8 @@ import Darwin
 import Bionic
 #elseif canImport(Glibc)
 import Glibc
+#elseif os(WASI)
+import WASILibc
 #endif
 
 #if canImport(CRT)

Sources/FoundationEssentials/String/String+Path.swift

@@ -18,6 +18,8 @@ import Android
 import Glibc
 #elseif os(Windows)
 import WinSDK
+#elseif os(WASI)
+import WASILibc
 #endif
 
 internal import _FoundationCShims

Sources/FoundationInternationalization/Calendar/Calendar_ICU.swift

@@ -22,6 +22,8 @@ import Glibc
 import CRT
 #elseif canImport(Darwin)
 import Darwin
+#elseif os(WASI)
+import WASILibc
 #endif
 
 internal import _FoundationICU

Sources/FoundationInternationalization/Formatting/Duration+Formatting.swift

@@ -22,6 +22,8 @@ import Android
 import Glibc
 #elseif os(Windows)
 import CRT
+#elseif os(WASI)
+import WASILibc
 #endif
 
 @available(macOS 13.0, iOS 16.0, watchOS 9.0, tvOS 16.0, *)