Add support for Scala Native 0.5.x.

Unfortunately, there is no patch Scala version in common between
Scala.js 0.6.x and Scala Native 0.5.x. This means we have to force
different versions when building for Native 0.5.x.

Author: sjrd

.github/workflows/ci.yml

@@ -14,9 +14,16 @@ jobs:
       matrix:
         scalaversion: ["2.11.12", "2.12.13", "2.13.4"]
         platform: ["JVM", "JS", "JS-0.6.x", "Native"]
+        include:
+          # Earliest Scala versions supported by Scala Native 0.5.x
+          - scalaversion: "2.12.14"
+            platform: "Native-0.5.x"
+          - scalaversion: "2.13.8"
+            platform: "Native-0.5.x"
     env:
       SCALAJS_VERSION: "${{ matrix.platform == 'JS-0.6.x' && '0.6.33' || '' }}"
-      PROJECT_NAME: "portable-scala-reflect${{ matrix.platform == 'JS-0.6.x' && 'JS' || matrix.platform }}"
+      SCALANATIVE_VERSION: "${{ matrix.platform == 'Native-0.5.x' && '0.5.2' || '' }}"
+      PROJECT_NAME: "portable-scala-reflect${{ matrix.platform == 'JS-0.6.x' && 'JS' || matrix.platform == 'Native-0.5.x' && 'Native' || matrix.platform }}"
     steps:
       - uses: actions/checkout@v2
       - uses: actions/setup-node@v4
@@ -27,8 +34,8 @@ jobs:
           java-version: "adopt@1.8"
       - uses: coursier/cache-action@v5
       - name: Unit tests
-        run: sbt "++${{ matrix.scalaversion }}" "${{ env.PROJECT_NAME }}/test"
+        run: sbt "++${{ matrix.scalaversion }}!" "${{ env.PROJECT_NAME }}/test"
       - name: Test generate documentation
-        run: sbt "++${{ matrix.scalaversion }}" "${{ env.PROJECT_NAME }}/doc"
+        run: sbt "++${{ matrix.scalaversion }}!" "${{ env.PROJECT_NAME }}/doc"
       - name: MiMa
-        run: sbt "++${{ matrix.scalaversion }}" "${{ env.PROJECT_NAME }}/mimaReportBinaryIssues"
+        run: sbt "++${{ matrix.scalaversion }}!" "${{ env.PROJECT_NAME }}/mimaReportBinaryIssues"

build.sbt

@@ -32,8 +32,14 @@ lazy val `portable-scala-reflect` = crossProject(JSPlatform, JVMPlatform, Native
   .settings(
     scalacOptions in (Compile, doc) -= "-Xfatal-warnings",
 
-    mimaPreviousArtifacts +=
-      organization.value %%% moduleName.value % previousVersion,
+    mimaPreviousArtifacts ++= {
+      val isNewInThisRelease = System.getenv("SCALANATIVE_VERSION") == "0.5.2"
+      if (isNewInThisRelease)
+        Set.empty
+      else
+        Set(organization.value %%% moduleName.value % previousVersion)
+    },
+    mimaFailOnNoPrevious := false,
 
     publishMavenStyle := true,
     publishTo := {

project/plugins.sbt

@@ -1,10 +1,13 @@
 val scalaJSVersion =
   Option(System.getenv("SCALAJS_VERSION")).filter(_ != "").getOrElse("1.0.0")
 
+val scalaNativeVersion =
+  Option(System.getenv("SCALANATIVE_VERSION")).filter(_ != "").getOrElse("0.4.4")
+
 addSbtPlugin("org.scala-js" % "sbt-scalajs" % scalaJSVersion)
 addSbtPlugin("org.portable-scala" % "sbt-scalajs-crossproject" % "1.3.2")
 
-addSbtPlugin("org.scala-native" % "sbt-scala-native" % "0.4.4")
+addSbtPlugin("org.scala-native" % "sbt-scala-native" % scalaNativeVersion)
 addSbtPlugin("org.portable-scala" % "sbt-scala-native-crossproject" % "1.3.2")
 
 addSbtPlugin("com.typesafe" % "sbt-mima-plugin" % "0.8.1")