Bump mill from 0.11.5 to 0.12.5 (#133)

Signed-off-by: Qiming Chu <cchuqiming@gmail.com>

Author: Emin017

.github/workflows/template-cleanup.yml

@@ -41,7 +41,7 @@ jobs:
 
           # Replace placeholders
           sed -i "s/%NAME%/$NAME/g" build.sbt README.md src/test/scala/gcd/*
-          sed -i "s/%NAME%/$WRAPPED_NAME/g" build.sc
+          sed -i "s/%NAME%/$WRAPPED_NAME/g" build.mill
           sed -i "s/%REPOSITORY%/${GITHUB_REPOSITORY/\//\\/}/g" README.md
           sed -i "s/%ORGANIZATION%/$GROUP/g" build.sbt
 

.github/workflows/test.yml

@@ -19,14 +19,17 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v4
       - name: Cleanup
-        run: sed -i "s/%NAME%/test/g" build.sc
+        run: sed -i "s/%NAME%/test/g" build.mill
       - name: Cache Scala
         uses: coursier/cache-action@v6
       - name: Setup Scala
         uses: coursier/setup-action@v1
         with:
           jvm: adopt:11
-          apps: sbt mill
+          apps: sbt
+      - name: Setup Mill
+        run: |
+          curl -L https://github.com/com-lihaoyi/mill/releases/download/0.12.5/0.12.5 > mill && chmod +x mill
       - name: Setup Dependencies
         run: |
           sudo apt-get install ccache
@@ -56,4 +59,4 @@ jobs:
       - name: SBT Test
         run: sbt test
       - name: mill Test
-        run: mill _.test
+        run: ./mill _.test

.mill-jvm-opts

@@ -0,0 +1 @@
+-Dchisel.project.root=${PWD}

.mill-version

@@ -1 +1 @@
-0.11.5
+0.12.5

README.md

@@ -9,9 +9,9 @@ with a clean running [Chisel3](https://www.chisel-lang.org/) project.
 
 ### Dependencies
 
-#### JDK 8 or newer
+#### JDK 11 or newer
 
-We recommend LTS releases Java 8 and Java 11. You can install the JDK as your operating system recommends, or use the prebuilt binaries from [AdoptOpenJDK](https://adoptopenjdk.net/).
+We recommend using Java 11 or later LTS releases. While Chisel itself works with Java 8, our preferred build tool Mill requires Java 11. You can install the JDK as your operating system recommends, or use the prebuilt binaries from [Adoptium](https://adoptium.net/) (formerly AdoptOpenJDK).
 
 #### SBT or mill
 

build.sc build.mill

@@ -7,8 +7,14 @@ import scalalib._
 // support BSP
 import mill.bsp._
 
+// Note: This project requires .mill-jvm-opts file containing:
+//   -Dchisel.project.root=${PWD}
+// This is needed because Chisel needs to know the project root directory
+// to properly generate and handle test directories and output files.
+// See: https://github.com/com-lihaoyi/mill/issues/3840
+
 object %NAME% extends SbtModule { m =>
-  override def millSourcePath = os.pwd
+  override def millSourcePath = super.millSourcePath / os.up
   override def scalaVersion = "2.13.15"
   override def scalacOptions = Seq(
     "-language:reflectiveCalls",
@@ -22,7 +28,7 @@ object %NAME% extends SbtModule { m =>
   override def scalacPluginIvyDeps = Agg(
     ivy"org.chipsalliance:::chisel-plugin:6.6.0",
   )
-  object test extends SbtModuleTests with TestModule.ScalaTest {
+  object test extends SbtTests with TestModule.ScalaTest {
     override def ivyDeps = m.ivyDeps() ++ Agg(
       ivy"org.scalatest::scalatest::3.2.16"
     )