Adding sysroot/usr/include

[Ashiq Shyam]

How do I add sysroot/usr/include/android/ that is prebuilts/ndk/ to an android.bp that is in external/Helloworld ?

I tried adding it in the android.bp of my external/Helloworld/Android.bp as follows : 

cc_library_static {
    name: "hello",

    include_dirs: [
    "../../../prebuilts/ndk/android-ndk-r21b/sysroot/usr/include"
    ],
     
    srcs: [ "foo.c"
    ],

    host_ldlibs: [
        "-L" + "../../../prebuilts/ndk/android-ndk-r21b/sysroot" + "/usr/lib",
    ],

    cflags: [

       "foo" 
    ],

    static_libs: ["foo"],
    vendor: true,

}

However i receive the error that :

error: external/dab/MTK/Android.bp:117:1: module "hello" variant "android_vendor.34_arm64_armv8-a_cortex-a72_static": Path is outside directory: ../../../prebuilts/ndk/android-ndk-r21b/sysroot/usr/include

[enh]

why are you trying to do that? soong will automatically give you the
right sysroot when it calls clang.

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[Dan Willemsen]

You may want to use `sdk_version: "current"`, `sdk_version: "31"`, etc if you need it to be built against something similar to the NDK for some reason. But like Elliott said, after that it's all automatic.

- Dan

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