android-8.0.0_r12 build error on mac OS

[Dean Wheatley]

I see a build error for android-8.0.0_r12 on mac OS

[ 11% 1830/16140] target asm: 2ndbootloader.bin <= hardware/intel/bootstub/head.S

FAILED: out/target/product/<target>/obj/EXECUTABLES/2ndbootloader.bin_intermediates/head.o 

/bin/bash -c "prebuilts/clang/host/darwin-x86/clang-3859424/bin/clang -I system/core/mkbootimg -I hardware/intel/bootstub -I out/target/product/<target>/obj/EXECUTABLES/2ndbootloader.bin_intermediates -I out/target/product/<target>/gen/EXECUTABLES/2ndbootloader.bin_intermediates -I libnativehelper/include/nativehelper \$(cat out/target/product/<target>/obj/EXECUTABLES/2ndbootloader.bin_intermediates/import_includes)  -I system/core/include -I system/media/audio/include -I hardware/libhardware/include -I hardware/libhardware_legacy/include -I hardware/ril/include -I libnativehelper/include -I frameworks/native/include -I frameworks/native/opengl/include -isystem frameworks/av/include -isystem out/target/product/<target>/obj/include -isystem device/asus/fugu/kernel-headers -isystem bionic/libc/arch-x86/include -isystem bionic/libc/include -isystem bionic/libc/kernel/uapi -isystem bionic/libc/kernel/uapi/asm-x86 -isystem bionic/libc/kernel/android/uapi -c  -m32 -ffreestanding -Wall -O1 -DCMDLINE_SIZE=0x400 -DAOSP_HEADER_ADDRESS=0x10007800   -std=gnu99    -DSTACK_OFFSET=0x10F00000 -D__ASSEMBLY__ -MD -MF out/target/product/<target>/obj/EXECUTABLES/2ndbootloader.bin_intermediates/head.d -o out/target/product/<target>/obj/EXECUTABLES/2ndbootloader.bin_intermediates/head.o hardware/intel/bootstub/head.S"

hardware/intel/bootstub/head.S:59:10: error: mach-o section specifier uses an unknown section type

.section ".text.head","ax",@progbits

         ^

[ 11% 1834/16140] build out/target/common/obj/JAVA_LIBRARIES/sdk_v15_intermediates/classes.jack

ninja: build stopped: subcommand failed.

22:59:50 ninja failed with: exit status 1

make: *** [run_soong_ui] Error 1

I will attempt a build using prebuilts/clang/host/darwin-x86/ master branch instead, but I would like to know whether mac OS builds of the android-8.0.0* branches is supported. 

The build error points to http://llvm.org/doxygen/MCSectionMachO_8cpp_source.html line 232, but it's unclear to me what section type is needed.

[Colin Cross]

This is specifically a problem with intel's code, it is assuming that the compiler targeting the machine doing the building can also be used to target the device being built for.  That is true for a linux x86 build machine targeting a linux x86 device, but it is not true for a mac build machine.

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