CODEWITHSUNDEEP
androidcandroid-ndkc-preprocessor
stdcall
stdcall

Reputation: 28860

Distinguish between NDK build and Android build

I have a native library I build that needs to be build in the Android build, but can also be built using the NDK. How can I distinguish using the preprocessor between NDK build and Android build.

#ifdef __ANDROID__

#ifdef NDK ??? // does ndk export some symbols I can use here ?

foo();

#else // Android tree build

foo2();

#endig

#endif // __ANDROID__

Upvotes: 0

Views: 484

Answers (1)

ozbek
ozbek

Reputation: 21183

I would use one of the platform build environment variables to distinguish two builds. That could be DEVICE_NAME, TARGET_DEVICE, PLATFORM_VERSION or anything else that's defined beyond my project's scope. And, depending on that environment variable, I'd define a flag in my project's Android.mk:

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)

LOCAL_MODULE := foo

ifeq ($(DEVICE_NAME),)
    # no device name is defined, got to be an NDK build
    LOCAL_CFLAGS := -DANDROID_NDK
endif

and then in foobar.c

#ifdef ANDROID_NDK
    foo();
#else
    foo2();

Upvotes: 2

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