Refactored built-script-impl:

- Use consistent terminology for target platforms, disambiguate uses of
  'deployment_target' in to 'host' and 'stdlib_targets'
- Changed parameters to build script:
  - install-prefix no longer has to include toolchain-prefix on OSX
  - swift-sdks has been replaced by stdlib-deployment-targets
  - built-stdlib-deployment-targets lets you restrict which of the
    stdlib-deployment targets are built
- Calculate stdlib_targets per host, to facilitate future cross-compiling
- Only use executables from LOCAL_HOST
- Only execute testable targets of the LOCAL_HOST
- Remove some cases of switching on 'uname' to facilitate future
  cross-compiling

utils/build-presets.ini

@@ -32,8 +32,6 @@ dash-dash
 verbose-build
 build-ninja
 
-swift-sdks=OSX;IOS;IOS_SIMULATOR;TVOS;TVOS_SIMULATOR;WATCHOS;WATCHOS_SIMULATOR
-
 # Build static standard library because it is used
 # to build external projects.
 build-swift-static-stdlib
@@ -76,7 +74,7 @@ skip-build-tvos
 skip-test-tvos
 skip-build-watchos
 skip-test-watchos
-swift-sdks=OSX
+stdlib-deployment-targets=macosx-x86_64
 swift-primary-variant-sdk=OSX
 swift-primary-variant-arch=x86_64
 
@@ -406,7 +404,7 @@ skip-build-tvos
 skip-test-tvos
 skip-build-watchos
 skip-test-watchos
-swift-sdks=OSX
+stdlib-deployment-targets=macosx-x86_64
 swift-primary-variant-sdk=OSX
 swift-primary-variant-arch=x86_64
 
@@ -671,7 +669,6 @@ build-ninja
 build-swift-static-stdlib
 build-swift-stdlib-unittest-extra
 compiler-vendor=apple
-swift-sdks=OSX;IOS;IOS_SIMULATOR;TVOS;TVOS_SIMULATOR;WATCHOS;WATCHOS_SIMULATOR
 
 install-swift
 install-lldb

utils/build-script

@@ -1274,7 +1274,7 @@ details of the setups of other systems or automated environments.""")
     build_script_impl_args = [
         "--workspace", workspace.source_root,
         "--build-dir", workspace.build_root,
-        "--install-prefix", os.path.abspath(args.install_prefix),
+        "--install-prefix", args.install_prefix,
         "--host-target", args.host_target,
         "--stdlib-deployment-targets",
         " ".join(args.stdlib_deployment_targets),