Build against a fixed ProGuardCORE version

With this change the stable ProGuard branch remains stable, independent
of changes in ProGuardCORE. This avoids the stable branch of ProGuard
failing if breaking changes are pushed to ProGuardCORE master branch.

.github/workflows/continuous_integration.yml

@@ -13,15 +13,11 @@ jobs:
       - uses: actions/checkout@v2
         with:
           path: proguard-main
-      - uses: actions/checkout@v2
-        with:
-          repository: Guardsquare/proguard-core
-          path: proguard-core
       - uses: actions/setup-java@v1
         with:
           java-version: 8
       - uses: eskatos/gradle-command-action@v1
         with:
           build-root-directory: proguard-main/
           wrapper-directory: proguard-main/
-          arguments: --include-build ../proguard-core/ test jar
+          arguments: test jar

README.md

@@ -218,25 +218,7 @@ ProGuard in detail.
 
 ## 💻 Building ProGuard
 
-Building ProGuard is easy - you'll need:
-
-* a Java 8 JDK installed
-* a clone of the [ProGuardCORE](https://github.com/Guardsquare/proguard-core) repository, since ProGuard 
-  is built on the ProGuardCORE library 
-
-You can then execute a composite build with the following Gradle command:
-
-```bash
-./gradlew --include-build=../proguard-core assemble
-```
-
-Alternatively, make the composite build persistent by editing this line in `gradle.properties`.
-You can also add this line to a `gradle.properties` file in your Gradle user home (`~/.gradle/gradle.properties`).
-
-```properties
-# Optionally set up a composite build with ProGuardCORE.
-#proguardCoreDir = ../proguard-core
-```
+Building ProGuard is easy - you'll just need a Java 8 JDK installed.
 
 The artifacts will be generated in the `lib` directory. You can then execute ProGuard using the
 scripts in `bin`, for example:
@@ -245,10 +227,10 @@ scripts in `bin`, for example:
 bin/proguard.sh
 ```
 
-You can publish the artifacts (including proguard-core) to your local Maven repository using:
+You can publish the artifacts to your local Maven repository using:
 
 ```bash
-./gradlew --include-build=../proguard-core :proguard-core:publishToMavenLocal publishToMavenLocal
+./gradlew publishToMavenLocal
 ```
 
 ## 🤝 Contributing

gradle.properties

@@ -1,4 +1,6 @@
 proguardVersion = 7.1.1
+
+# The version of ProGuardCORE that sub-projects are built with
 proguardCoreVersion = 7.1.0
 gsonVersion = 2.8.5
 kotlinVersion = 1.3.72
@@ -9,9 +11,6 @@ target = 1.8
 wtkDir = /usr/local/java/wtk2.1
 wtkHome = /usr/local/java/wtk
 
-# Optionally set up a composite build with ProGuardCORE.
-#proguardCoreDir = ../proguard-core
-
 org.gradle.vfs.watch=true
 org.gradle.parallel=true
 org.gradle.caching=true

settings.gradle

@@ -11,11 +11,6 @@ pluginManagement {
     }
 }
 
-if (hasProperty('proguardCoreDir'))
-{
-    includeBuild proguardCoreDir
-}
-
 rootProject.name = 'proguard'
 
 include 'base'