[Buildroot] [Bug 9876] New: aarch64 support with gcc 4.8 toolchain

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=9876

            Bug ID: 9876
           Summary: aarch64 support with gcc 4.8 toolchain
           Product: buildroot
           Version: 2017.02
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P5
         Component: Other
          Assignee: unassigned at buildroot.uclibc.org
          Reporter: jpcartal at free.fr
                CC: buildroot at uclibc.org
  Target Milestone: ---

Hello,

I'm trying to compile for the aarch64 architecture using an external gcc 4.8
toolchain.
However I get the following error :
>>> toolchain-external-custom  Installing to staging directory
/usr/bin/install -D -m 0755
/home/jpcartal/Dev/Ssd/buildroot/buildroot-2017.02/N30_test/build/toolchain-external-custom/toolchain-wrapper
/home/jpcartal/Dev/Ssd/buildroot/buildroot-2017.02/N30_test/host/usr/bin/toolchain-wrapper
aarch64-linux-gcc: error: unrecognized command line option '-mabi=lp64'

My understanding is that the mabi=lp64 option is only available on gcc 4.9.x
and newer.

Is there any solution available to compile for aarch64 architecture with a gcc
4.8.x toolchain ?

Thanks for your help.

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