Building i.MX6 Android L5.1.1_2.1.0 on Ubuntu 16.04

[#1]

Few issues encountered trying to build L5.1.1_2.1.0 Android for i.MX6:

(some of them can apply to Android M6 build also)

Issue-1: OpenJDK-7 required to build L5.1.1_2.1.0 but not able to download/install in Ubuntu 16.04:

solution: Ubuntu 16.04 and openjdk 7 - Ask Ubuntu

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sudo add-apt-repository ppa:openjdk-r/ppa

sudo apt-get update

sudo apt-get install openjdk-7-jdk

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Issue-2: without any modification, got error message like: "You have tried to change the API from what has been previously approved." during compilation.

solution: follow the suggestion in the error message, do "make update-api"

Issue-3: error messages like

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external/libcxx/include/thread:149: error: unsupported reloc 43

clang: error: linker command failed with exit code 1 (use -v to see invocation)

build/core/host_shared_library_internal.mk:44: recipe for target 'out/host/linux-x86/obj32/lib/libc++.so' failed

make: *** [out/host/linux-x86/obj32/lib/libc++.so] Error 1

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related post on Internet:

http://stackoverflow.com/questions/36048358/building-android-from-sources-unsupported-reloc-43

https://bbs.archlinux.org/viewtopic.php?id=209698

solution:(as mentioned in the link above)

replaced "prebuilts/gcc/linux-x86/host/x86_64-linux-glibc2.15-4.6/x86_64-linux/bin/ld" with the symlink to "/usr/bin/ld.gold"

so this should look like:

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~/myandroid/prebuilts/gcc/linux-x86/host/x86_64-linux-glibc2.11-4.6/x86_64-linux/bin$ ls -l ld*

lrwxrwxrwx 1 jimlin jimlin      16     May  6 14:48 ld -> /usr/bin/ld.gold

-rwxrwxr-x 1 jimlin jimlin 1645584 May  6 11:24 ld.bfd

-rwxrwxr-x 1 jimlin jimlin 3497448 May  6 11:24 ld.gold

-rwxrwxr-x 1 jimlin jimlin 3497448 May  6 11:24 ld.org

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to this point I can build L5.1.1_2.1.0 successfully.(on 2016, May, 12.)

Issue-4: can't run the SD tool "fsl-sdcard-partition.sh" used to partition/format SD card in "~/myandroid/device/fsl/common/tools"

root-cause: in Ubuntu 16.04, "sfdisk" tool doesn't support "-u" parameter:

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sfdisk from util-linux 2.27.1

-u, --unit S              deprecated, only sector unit is supported

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error message encountered when running the script:

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~/myandroid/device/fsl/common/tools$ sudo ./fsl-sdcard-partition.sh /dev/sdc

sfdisk: unsupported unit 'M'

sfdisk: unsupported unit 'M'

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I've modified the script a bit to adapt the changes, as attached.