[ 14% 1/7] target thumb C: gralloc.poplar <= device/hisilicon/poplar/audio/audio_hw.c

FAILED: /bin/bash -c "(PWD=/proc/self/cwd prebuilts/misc/linux-x86/ccache/ccache prebuilts/clang/host/linux-x86/clang-2690385/bin/clang -I vendor/arm/mali6xx -I vendor/arm/mali6xx/include -I vendor/arm/mali6xx/kernel/include -I system/core/libion/include -I device/hisilicon/poplar/gralloc -I out/target/product/poplar/obj/SHARED_LIBRARIES/gralloc.poplar_intermediates -I out/target/product/poplar/gen/SHARED_LIBRARIES/gralloc.poplar_intermediates -I libnativehelper/include/nativehelper \$(cat out/target/product/poplar/obj/SHARED_LIBRARIES/gralloc.poplar_intermediates/import_includes) -isystem system/core/include -isystem system/media/audio/include -isystem hardware/libhardware/include -isystem hardware/libhardware_legacy/include -isystem hardware/ril/include -isystem libnativehelper/include -isystem frameworks/native/include -isystem frameworks/native/opengl/include -isystem frameworks/av/include -isystem frameworks/base/include -isystem out/target/product/poplar/obj/include -isystem bionic/libc/arch-arm/include -isystem bionic/libc/include -isystem bionic/libc/kernel/uapi -isystem bionic/libc/kernel/common -isystem bionic/libc/kernel/uapi/asm-arm -isystem bionic/libm/include -isystem bionic/libm/include/arm -c    -fno-exceptions -Wno-multichar -msoft-float -ffunction-sections -fdata-sections -funwind-tables -fstack-protector-strong -Wa,--noexecstack -Werror=format-security -D_FORTIFY_SOURCE=2 -fno-short-enums -no-canonical-prefixes -march=armv7-a -mfloat-abi=softfp -mfpu=neon -DANDROID -fmessage-length=0 -W -Wall -Wno-unused -Winit-self -Wpointer-arith -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Werror=date-time -DNDEBUG -g -Wstrict-aliasing=2 -DNDEBUG -UDEBUG  -D__compiler_offsetof=__builtin_offsetof -Werror=int-conversion -Wno-reserved-id-macro -Wno-format-pedantic -Wno-unused-command-line-argument -fcolor-diagnostics -nostdlibinc  -target arm-linux-androideabi    -target arm-linux-androideabi -Bprebuilts/gcc/linux-x86/arm/arm-linux-androideabi-4.9/arm-linux-androideabi/bin    -std=gnu99     -mthumb -Os -fomit-frame-pointer -fno-strict-aliasing   -DLOG_TAG=\\\"gralloc\\\" -DSTANDARD_LINUX_SCREEN -DMALI_ION=1 -DMALI_AFBC_GRALLOC=0 -DGRALLOC_32_BITS -DMALI_ARCHITECTURE_UTGARD=0 -DPLATFORM_SDK_VERSION=25 -DDISABLE_FRAMEBUFFER_HAL=0 -DMALI_SUPPORT_AFBC_WIDEBLK=0 -DMALI_USE_YUV_AFBC_WIDEBLK=0 -DAFBC_YUV420_EXTRA_MB_ROW_NEEDED=0 -DGRALLOC_USE_ION_DMA_HEAP=0 -DGRALLOC_USE_ION_COMPOUND_PAGE_HEAP=0 -DGRALLOC_INIT_AFBC=0 -DGRALLOC_FB_SWAP_RED_BLUE -DGRALLOC_ARM_FORMAT_SELECTION_DISABLE -fPIC -D_USING_LIBCXX   -Werror=int-to-pointer-cast -Werror=pointer-to-int-cast  -Werror=address-of-temporary -Werror=null-dereference -Werror=return-type  -MD -MF out/target/product/poplar/obj/SHARED_LIBRARIES/audio.primary.poplar_intermediates/audio_hw.d -o out/target/product/poplar/obj/SHARED_LIBRARIES/audio.primary.poplar_intermediates/audio_hw.o device/hisilicon/poplar/audio/audio_hw.c ) && (cp out/target/product/poplar/obj/SHARED_LIBRARIES/audio.primary.poplar_intermediates/audio_hw.d out/target/product/poplar/obj/SHARED_LIBRARIES/audio.primary.poplar_intermediates/audio_hw.P; sed -e 's/#.*//' -e 's/^[^:]*: *//' -e 's/ *\\\\\$//' -e '/^\$/ d' -e 's/\$/ :/' < out/target/product/poplar/obj/SHARED_LIBRARIES/audio.primary.poplar_intermediates/audio_hw.d >> out/target/product/poplar/obj/SHARED_LIBRARIES/audio.primary.poplar_intermediates/audio_hw.P; rm -f out/target/product/poplar/obj/SHARED_LIBRARIES/audio.primary.poplar_intermediates/audio_hw.d )"

I debug the Android.mk file, by printing out the $(LOCAL_SRC_FILES) before calling 

$(BUILD_SHARED_LIBRARY). And include $(CLEAR_VARS) were called in each Android.mk.

Note that audio_hw.c is not in the source of gralloc target.

What can possible go wrong?