I'm making a new Android project, with the standard 'app' module, as well as a library project (let's call it 'custom_lib'). In the app's build.gradle file, I link the module as such :
dependencies {
compile project(':custom_lib')
}
When I trigger the build process (Menu Build > Make Project), I get the following output in the Gradle console
Executing tasks: [clean, :app:compileDebugSources, :custom_lib:compileDebugSources]
Configuration on demand is an incubating feature.
:app:clean
:custom_lib:clean
:app:preBuild
:app:preDebugBuild
:app:checkDebugManifest
:app:preReleaseBuild
:custom_lib:compileLint
:custom_lib:copyReleaseLint UP-TO-DATE
:custom_lib:mergeReleaseProguardFiles UP-TO-DATE
:custom_lib:preBuild
:custom_lib:preReleaseBuild
:custom_lib:checkReleaseManifest
:custom_lib:prepareReleaseDependencies
:custom_lib:compileReleaseAidl
:custom_lib:compileReleaseRenderscript
:custom_lib:generateReleaseBuildConfig
:custom_lib:generateReleaseAssets UP-TO-DATE
:custom_lib:mergeReleaseAssets
:custom_lib:generateReleaseResValues UP-TO-DATE
:custom_lib:generateReleaseResources
:custom_lib:packageReleaseResources
:custom_lib:processReleaseManifest
:custom_lib:processReleaseResources
:custom_lib:generateReleaseSources
:custom_lib:compileReleaseJava
:custom_lib:processReleaseJavaRes UP-TO-DATE
:custom_lib:packageReleaseJar
:custom_lib:compileReleaseNdk
:custom_lib:packageReleaseJniLibs UP-TO-DATE
:custom_lib:packageReleaseLocalJar UP-TO-DATE
:custom_lib:packageReleaseRenderscript UP-TO-DATE
:custom_lib:bundleRelease
:app:prepareComAndroidSupportAppcompatV72102Library
:app:prepareComAndroidSupportSupportV42102Library
:app:prepareTestDoubleBuildCustom_libUnspecifiedLibrary
:app:prepareDebugDependencies
:app:compileDebugAidl
:app:compileDebugRenderscript
:app:generateDebugBuildConfig
:app:generateDebugAssets UP-TO-DATE
:app:mergeDebugAssets
:app:generateDebugResValues UP-TO-DATE
:app:generateDebugResources
:app:mergeDebugResources
:app:processDebugManifest
:app:processDebugResources
:app:generateDebugSources
:app:compileDebugJava
:app:compileDebugNdk
:app:compileDebugSources
:custom_lib:preDebugBuild
:custom_lib:checkDebugManifest
:custom_lib:prepareDebugDependencies
:custom_lib:compileDebugAidl
:custom_lib:compileDebugRenderscript
:custom_lib:generateDebugBuildConfig
:custom_lib:generateDebugAssets UP-TO-DATE
:custom_lib:mergeDebugAssets
:custom_lib:generateDebugResValues UP-TO-DATE
:custom_lib:generateDebugResources
:custom_lib:packageDebugResources
:custom_lib:processDebugManifest
:custom_lib:processDebugResources
:custom_lib:generateDebugSources
:custom_lib:compileDebugJava
:custom_lib:compileDebugNdk
:custom_lib:compileDebugSources
BUILD SUCCESSFUL
Total time: 2.184 secs
What puzzles me is that the build mechanism triggers a Debug build (as the first line says), but almost immediately, Gradle uses the task :app:preReleaseBuild which make my custom_lib module to be built with the Release configuration.
And then, after the app is fully built, Gradle compiles my module with the Debug configuration.
So my questions are :
Why is it doing this double build which seems incoherent ?
How can I make sure that the library is built with debug configuration when I launch a Debug build process ?
EDIT :
app/build.gradle :
apply plugin: 'com.android.application'
android {
compileSdkVersion 21
buildToolsVersion "21.1.1"
defaultConfig {
applicationId "com.deezer.testdoublebuild"
minSdkVersion 8
targetSdkVersion 21
versionCode 1
versionName "1.0"
}
compileOptions {
sourceCompatibility JavaVersion.VERSION_1_7
targetCompatibility JavaVersion.VERSION_1_7
}
buildTypes {
debug{
debuggable true
}
release {
debuggable false
minifyEnabled false
}
}
}
dependencies {
compile project(':custom_lib')
}
custom_lib/build.gradle :
apply plugin: 'com.android.library'
android {
compileSdkVersion 21
buildToolsVersion "21.1.1"
defaultConfig {
applicationId "com.deezer.mylibrary"
minSdkVersion 8
targetSdkVersion 21
versionCode 1
versionName "1.0"
}
compileOptions {
sourceCompatibility JavaVersion.VERSION_1_7
targetCompatibility JavaVersion.VERSION_1_7
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
}
Note : I'm using Android Studio 1.0 RC 1 / Gradle 2.2, and reproduced this issue by creating a new project from scratch, add an empty Android Library module, and "voila"
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