fix linker issue on travis ubuntu

.travis.yml

@@ -38,9 +38,7 @@ matrix:
       env: TARGET=swift
     - os: linux
       compiler: clang
-      env:
-        - TARGET=swift
-        - SWIFT_VERSION=swift-3.1.1
+      env: TARGET=swift
     - os: osx
       osx_image: xcode8.2
       env: TARGET=dotnet

.travis/before-install-linux-swift.sh

@@ -1,9 +1,5 @@
 set -euo pipefail
 
-# download swift
-mkdir swift
-curl https://swift.org/builds/$SWIFT_VERSION-release/ubuntu1404/$SWIFT_VERSION-RELEASE/$SWIFT_VERSION-RELEASE-ubuntu14.04.tar.gz -s | tar xz -C swift &> /dev/null
-
 # make sure we use trusty repositories (travis by default uses precise)
 curl https://repogen.simplylinux.ch/txt/trusty/sources_c4aa56bd26c0f54f391d8fae3e687ef5f6e97c26.txt | sudo tee /etc/apt/sources.list
 
@@ -14,8 +10,6 @@ curl https://repogen.simplylinux.ch/txt/trusty/sources_c4aa56bd26c0f54f391d8fae3
 sudo apt-get update
 sudo apt-get install clang libicu-dev libxml2 sqlite3
 
-# check swift
-export SWIFT_HOME=$(pwd)/swift/$SWIFT_VERSION-RELEASE-ubuntu14.04/usr/bin/
-export PATH=${SWIFT_HOME):$PATH
-swift --version
-swift build --version
+# This would fix a know linker issue mentioned in:
+# https://bugs.swift.org/browse/SR-2299
+sudo ln -sf ld.gold /usr/bin/ld

.travis/run-tests-swift.sh

@@ -1,4 +1,20 @@
 #!/bin/bash
 
-# only test swift as we develop on os x so likely well tested and its dog slow on travis
+# linux specific setup, those setup have to be
+# here since environment variables doesn't pass
+# across scripts
+if [ $TRAVIS_OS_NAME == "linux" ]; then
+  export SWIFT_VERSION=swift-3.1.1
+  export SWIFT_HOME=$(pwd)/swift/$SWIFT_VERSION-RELEASE-ubuntu14.04/usr/bin/
+  export PATH=$SWIFT_HOME:$PATH
+
+  # download swift
+  mkdir swift
+  curl https://swift.org/builds/$SWIFT_VERSION-release/ubuntu1404/$SWIFT_VERSION-RELEASE/$SWIFT_VERSION-RELEASE-ubuntu14.04.tar.gz -s | tar xz -C swift &> /dev/null
+fi
+
+# check swift
+swift --version
+swift build --version
+
 mvn -q -Dtest=swift.* test

runtime-testsuite/test/org/antlr/v4/test/runtime/swift/BaseSwiftTest.java

@@ -194,10 +194,15 @@ public class BaseSwiftTest implements RuntimeTestSupport {
 
 		try {
 			String dylibPath = ANTLR_RUNTIME_PATH + "/.build/debug/";
-			runProcess(projectDir, SWIFT_CMD, "build",
+			Pair<String, String> buildResult = runProcess(projectDir, SWIFT_CMD, "build",
 					"-Xswiftc", "-I"+dylibPath,
 					"-Xlinker", "-L"+dylibPath,
-					"-Xlinker", "-lAntlr4");
+					"-Xlinker", "-lAntlr4",
+					"-Xlinker", "-rpath",
+					"-Xlinker", dylibPath);
+			if (buildResult.b.length() > 0) {
+				throw new RuntimeException("unit test build failed: " + buildResult.b);
+			}
 		} catch (IOException | InterruptedException e) {
 			e.printStackTrace();
 		}
@@ -259,7 +264,7 @@ public class BaseSwiftTest implements RuntimeTestSupport {
 		ST outputFileST = new ST(
 				"import Antlr4\n" +
 						"import Foundation\n" +
-						"setbuf(__stdoutp, nil)\n" +
+						"setbuf(stdout, nil)\n" +
 						"class TreeShapeListener: ParseTreeListener{\n" +
 						"    func visitTerminal(_ node: TerminalNode){ }\n" +
 						"    func visitErrorNode(_ node: ErrorNode){ }\n" +
@@ -320,7 +325,7 @@ public class BaseSwiftTest implements RuntimeTestSupport {
 				"import Antlr4\n" +
 						"import Foundation\n" +
 
-						"setbuf(__stdoutp, nil)\n" +
+						"setbuf(stdout, nil)\n" +
 						"let args = CommandLine.arguments\n" +
 						"let input = ANTLRFileStream(args[1])\n" +
 						"let lex = <lexerName>(input)\n" +