How to build the .s (asm) file in Android.mk file

Question

I am integrating custom codec to libstagefright in android source code. I completed successfully whatever explained by Custom Wrapper Codec Integration into Android but I found problem like I have .s file in my custom codec.

I am following the LOCAL_CFLAGS := -DOSCL_EXPORT_REF= -DOSCL_IMPORT_REF= from this it is not taking the .s files to build.

I have found several solutions but those are not my answer links are

• Android NDK: How to get compiler architecture in Android.mk dynamically

• What does this line mean? LOCAL_EXPORT_C_INCLUDES

• Define a symbol for an assembly (.s) source file in Android.mk?

• http://netmite.com/android/mydroid/dalvik/vm/Android.mk

• http://elinux.org/Android_Build_System

• https://cells-source.cs.columbia.edu/plugins/gitiles/toolchain/benchmark/+/8c231164b9a0a1b1b0784fe6d376ef201dce433d/gcstone/bench.mk

please help me for this issue

Thanks in Advance.

Answer 1

Please try with this approach to include the .s files. It is important to have a fallback C implementation and I assume that you do have one. In your codecs' Android.mk file,

ifeq ($(TARGET_ARCH),arm)
LOCAL_SRC_FILES += \
    src/asm/file1.s \
    src/asm/file2.s \
    src/asm/file3.s \
    src/asm/file4.s
else
LOCAL_SRC_FILES += \
    src/file1.cpp \
    src/file2.cpp \
    src/file3.cpp \
    src/file4.cpp
endif

For example, you can refer to the way the MP3 decoder is build as in this Android.mk file.