Add host target triple for s390x

Author: vivkong

Sources/Build/Triple.swift

@@ -33,6 +33,7 @@ public struct Triple {
  public enum Arch: String {
  case x86_64
  case armv7
+ case s390x
  }
 
  public enum Vendor: String {
@@ -108,6 +109,8 @@ public struct Triple {
 
  #if os(macOS)
  public static let hostTriple: Triple = .macOS
+ #elseif os(Linux) && arch(s390x)
+ public static let hostTriple: Triple = try! Triple("s390x-unknown-linux")
  #else
  public static let hostTriple: Triple = .linux
  #endif

Utilities/bootstrap

@@ -875,6 +875,8 @@ def main():
  # Compute the build paths.
  if platform.system() == 'Darwin':
  build_target = "x86_64-apple-macosx10.10"
+ elif platform.processor() == 's390x':
+ build_target = "s390x-unknown-linux"
  else:
  build_target = 'x86_64-unknown-linux'