Setup travis and fixed some unit testing issues on Linux. Also remove…

…d an obsolete file, causing the build to fail on Linux.

.travis.yml

@@ -0,0 +1,57 @@
+# make sudo to enforce running on a real linux VM and not in a container on a macOS VM.
+sudo: required
+# do not use swift as language, since otherwise the build always runs on a macOS VM.
+language: c
+dist: trusty # Ubuntu 14.04 LTS
+osx_image: xcode9.3beta
+
+matrix:
+  include:
+    - os: linux
+      compiler: clang
+      # gcc currently it is not possible to compile with gcc
+#    - os: linux
+#      compiler: gcc
+    - os: osx
+      compiler: clang
+
+before_install:
+  - uname -a
+  - |
+    if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then
+      # update silently
+      brew update >/dev/null
+      brew upgrade swiftlint
+      # check swift version
+      swift --version
+    fi
+  - |
+    if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then
+      sudo apt-get update
+      sudo apt-get install clang-3.6
+      export SWIFT_VERSION=4.1
+      # download swift
+      SWIFT_ARCHIVE=swift-$SWIFT_VERSION-RELEASE-ubuntu14.04.tar.gz
+      curl https://swift.org/builds/swift-$SWIFT_VERSION-release/ubuntu1404/swift-$SWIFT_VERSION-RELEASE/$SWIFT_ARCHIVE -s -o $SWIFT_ARCHIVE
+      tar xf $SWIFT_ARCHIVE
+      rm -f $SWIFT_ARCHIVE
+      # setup env for swift
+      export SWIFT_HOME=$(pwd)/swift-$SWIFT_VERSION-RELEASE-ubuntu14.04/usr/bin/
+      export PATH=$SWIFT_HOME:$PATH
+      # check swift version
+      swift --version
+      # fix linker issue: https://bugs.swift.org/browse/SR-2299
+      sudo ln -sf ld.gold /usr/bin/ld
+    fi
+script:
+  - swift build
+  - swift test
+  - |
+    # lint on osx only (no need to do this on every platform)
+    if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then
+      swiftlint --reporter json > swiftlint.json
+      cat swiftlint.json
+      # check for warnings as well
+      grep "Warning" swiftlint.json > /dev/null && echo "linting failed" && exit 1;
+      echo "linting passed"
+    fi

README.md

@@ -1,5 +1,9 @@
 # geodesic
 
+[![Swift Version](https://img.shields.io/badge/swift-4.1-blue.svg)](https://swift.org) 
+![Platform](https://img.shields.io/badge/platform-osx--64|linux--64-lightgrey.svg)
+[![Build Travis-CI Status](https://travis-ci.org/dastrobu/geodesic.png?branch=master)](https://travis-ci.org/dastrobu/geodesic) 
+
 Solver for the inverse geodesic problem in Swift.
 
 The inverse geodesic problem must be solved to compute the distance between two points on an oblate spheroid, or 
@@ -46,4 +50,9 @@ is employed, but different parameters can be specified, e.g. for the
              ellipsoid (a: 6378137.0, f: 1/298.257222100882711))
 
 
+## Known Issues
+
+ * Compilation with gcc on Linux does not work. `swift build` fails. 
+ No problems with clang on Linux. 
+
 

Tests/LinuxMain.swift

@@ -1,7 +1,7 @@
 import XCTest
 
-import GeodesicTests
+import geodesicTests
 
 var tests = [XCTestCaseEntry]()
-tests += GeodesicTests.allTests()
+tests += geodesicTests.allTests()
 XCTMain(tests)

Tests/geodesicTests/geodesicTests.swift

@@ -79,9 +79,12 @@ final class GeodesicTests: XCTestCase {
         XCTAssertEqual(distance(x, y), 111319.491, accuracy: delta)
     }
 
+#if !os(macOS)
     static var allTests = [
-        ("testShortcutForEqualPoints", testShortcutForEqualPoints),
-        ("testPoles", testPoles),
+        ("testDistance", testDistance),
         ("testGrs80", testGrs80),
+        ("testPoles", testPoles),
+        ("testShortcutForEqualPoints", testShortcutForEqualPoints),
     ]
+#endif
 }