How to build 32/64-bit shared libs from 32/64-bit pre-built static libs in master AOSP arm64

[Casper Mok]

Hi, 

I try to build 32/64-bit shared libraries from 32/64-bit static pre-built libraries in AOSP master under arm64-v8. 

I find several variables that I used in KitKat do not supporting 32/64-bit build, such as 

• LOCAL_PREBUILT_MODULE_FILE
  
• LOCAL_PREBUILT_LIBS

Indeed, all but LOCAL_PREBUILT_JNI_LIBS are not supporting 32/64-bit build. Further study finds that multi_prebuilt.mk does not support 32/64-bit builds. 

I am wondering if they are going to support in the near future or if there is a workaround now.

Cheers,

Casper

[Casper Mok]

I see no reply here. I give one example here - "LOCAL_PREBUILT_MODULE_FILE_$(TARGET_2ND_ARCH)" 

The necessary "TARGET_2ND_ARCH" for "LOCAL_PREBUILT_MODULE_FILE" is not supported in current AOSP master. Is there any workaround for this?

Cheers,

Casper

[Ying Wang]

You can easily build it with $(BUILD_PREBUILT), using arch specific LOCAL_SRC_FILES:

include $(CLEAR_VARS)

LOCAL_MODULE_SUFFIX := .a

LOCAL_MODULE := my_lib

LOCAL_MODULE_CLASS := STATIC_LIBRARIES

LOCAL_SRC_FILES_arm := <path-to-the-arm-prebuilt>

LOCAL_SRC_FILES_arm64 := <path-to-the-arm64-prebuilt>

LOCAL_MODULE_TARGET_ARCHS := arm arm64

LOCAL_MULTILIB := both

include $(BUILD_PREBUILT)

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[Ying Wang]

It should be LOCAL_MODULE_TARGET_ARCH (with no ending S).

[Casper Mok]

Ying Wang, 

Thank you. The suggestion on followings do work

• LOCAL_SRC_FILES_arm & LOCAL_SRC_FILES_arm64
  
• LOCAL_MODULE_TARGET_ARCH arm arm64

However, the 2nd party of this file is still not working. This involves linking 2 static libaries, my_a_lib and my_b_lib into a bigger library my_lib. It shows msg below.

"prebuilts/gcc/linux-x86/aarch64/aarch64-linux-android-4.9/bin/aarch64-linux-android-ar: unable to copy file 'out/target/product/generic_arm64/obj/STATIC_LIBRARIES/my_lib_intermediates/my_lib.a'; reason: Permission denied"

These involve following variables. Can someone give suggestions here? Thank you.

• LOCAL_WHOLE_STATIC_LIBRARIES
• LOCAL_EXPORT_C_INCLUDE_DIRS

Cheers,

Casper

[Ying Wang]

On Sun, Nov 2, 2014 at 6:49 PM, Casper Mok <caspe...@gmail.com> wrote:

Ying Wang, 

Thank you. The suggestion on followings do work

• LOCAL_SRC_FILES_arm & LOCAL_SRC_FILES_arm64
  
• LOCAL_MODULE_TARGET_ARCH arm arm64

However, the 2nd party of this file is still not working. This involves linking 2 static libaries, my_a_lib and my_b_lib into a bigger library my_lib. It shows msg below.

"prebuilts/gcc/linux-x86/aarch64/aarch64-linux-android-4.9/bin/aarch64-linux-android-ar: unable to copy file 'out/target/product/generic_arm64/obj/STATIC_LIBRARIES/my_lib_intermediates/my_lib.a'; reason: Permission denied"

It doesn't seem to be a build system issue. Check the permission bits of the concerned files.