CODEWITHSUNDEEP
androidgradleandroid-ndkndk-build
Seva Alekseyev
Seva Alekseyev

Reputation: 61380

Pass build type ("debug"/"release") to ndk-build

Android Studio, a project with an NDK library, using ndkBuild with Android.mk. My build uses a static library dependency, and the static library exists as a debug and as a release flavor, in separate directories. The makefile goes:

#Ref to libfoo
include $(CLEAR_VARS)
LOCAL_MODULE := foo
LOCAL_SRC_FILES := $(FOOPROJECT)\foo\build\intermediates\ndkBuild\debug\obj\local\$(TARGET_ARCH_ABI)\libfoo.a
include $(PREBUILT_STATIC_LIBRARY)

LOCAL_SRC_FILES has the debug flavor hard-coded as a part of the path. Not good. I'd like to use either "debug" or "release" there, depending on the current build type.

Is the current build type available in the makefile as a variable? If not, is is possible to pass it to ndk-build via the gradle file?

Upvotes: 2

Views: 2720

Answers (2)

peerless2012
peerless2012

Reputation: 209

NDK_DEBUG is the var what you need, 1 is debug, 0 is release.

ifeq ($(NDK_DEBUG), 1)
    BUILD_TYPE := debug
else
    BUILD_TYPE := release
endif
include $(CLEAR_VARS)
LOCAL_MODULE := foo
LOCAL_SRC_FILES := $(FOOPROJECT)\foo\build\intermediates\ndkBuild\$(BUILD_TYPE)\obj\local\$(TARGET_ARCH_ABI)\libfoo.a
include $(PREBUILT_STATIC_LIBRARY)

Other useful vars:

  • APP_BUILD_SCRIPT: Android.mk path
  • NDK_APPLICATION_MK: Application.mk path
  • APP_ABI: Same like TARGET_ARCH_ABI
  • NDK_OUT: the build obj path
  • NDK_LIBS_OUT: build lib path
  • APP_PLATFORM: Target os and api version,like android-21

You can check this file : ProjectPath/ModuleName/build/.cxx/$(BUILD_TYPE)/xxxx/$(TARGET_ARCH_ABI)/android_gradle_build_command_ModuleName_$(TARGET_ARCH_ABI).txt too see more info.

And here is a Android NDK demo, you can check the lib_module_provider and lib_module_beneficiary to see how to use pre-built library by ndk-build or cmake

Upvotes: 1

Seva Alekseyev
Seva Alekseyev

Reputation: 61380

EDIT: Michael's APP_OPTIM is better. Once he writes it up, I'll accept. For now, I'll leave this here.

Couldn't find a built-in variable, did a Gradle trick:

buildTypes {
    release {
        externalNativeBuild {
            ndkBuild {
                arguments "BUILD_TYPE=release"
            }}
    }
    debug {
        externalNativeBuild {
            ndkBuild {
                arguments "BUILD_TYPE=debug"
            }}
    }
}

Then the line in Android.mk becomes:

LOCAL_SRC_FILES := $(FOOPROJECT)\foo\build\intermediates\ndkBuild\$(BUILD_TYPE)\obj\local\$(TARGET_ARCH_ABI)\libfoo.a

Upvotes: 2

Related Questions