Add sbt build mode disabling generation of scaladoc to speedup bisection. Enabled with BISECTBUILD env variable allows to reduce publish times by 50%

Author: WojciechMazur

project/Build.scala

@@ -133,6 +133,7 @@ object Build {
 
 
   val isRelease = sys.env.get("RELEASEBUILD") == Some("yes")
+  val isBisect = sys.env.get("BISECTBUILD") == Some("yes")
 
   val dottyVersion = {
     def isNightly = sys.env.get("NIGHTLYBUILD") == Some("yes")
@@ -445,7 +446,13 @@ object Build {
       assert(docScalaInstance.loaderCompilerOnly == base.loaderCompilerOnly)
       docScalaInstance
     },
-    Compile / doc / scalacOptions ++= scalacOptionsDocSettings()
+    Compile / doc / scalacOptions ++= scalacOptionsDocSettings(),
+    // doc/skip might be ignored and still lead to compilation of doc sources
+    Compile / doc / skip := isBisect,
+    Compile/ doc / sources := {
+      if(isBisect) Nil
+      else (Compile/doc/sources).value
+    }
   )
 
   lazy val commonBenchmarkSettings = Seq(
@@ -1527,10 +1534,13 @@ object Build {
       SourceLinksIntegrationTest / test:= ((SourceLinksIntegrationTest / test) dependsOn generateScalaDocumentation.toTask("")).value,
     ).
     settings(
-      Compile / resourceGenerators ++= Seq(
-        generateStaticAssetsTask.taskValue,
-        bundleCSS.taskValue
-      ),
+      Compile / resourceGenerators ++= {
+        if(isBisect) Nil
+        else Seq(
+          generateStaticAssetsTask.taskValue,
+          bundleCSS.taskValue
+        )
+      },
       libraryDependencies ++= Dependencies.flexmarkDeps ++ Seq(
         "nl.big-o" % "liqp" % "0.8.2",
         "org.jsoup" % "jsoup" % "1.14.3", // Needed to process .html files for static site

project/scripts/bisect.scala

@@ -238,6 +238,7 @@ class CommitBisect(validationScript: File, shouldFail: Boolean, bootstrapped: Bo
     val bisectRunScript = s"""
       |scalaVersion=$$(sbt "print ${scala3CompilerProject}/version" | tail -n1)
       |rm -r out
+      |export BISECTBUILD=yes
       |sbt "clean; ${scala3Project}/publishLocal"
       |${validationCommandStatusModifier}${validationScript.getAbsolutePath} "$$scalaVersion"
     """.stripMargin