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    SubjectRe: [PATCH 00/15] Add support for clang LTO
    On Fri, Nov 3, 2017 at 11:29 AM, Mark Rutland <mark.rutland@arm.com> wrote:
    > On Fri, Nov 03, 2017 at 11:07:04AM -0700, Nick Desaulniers wrote:
    >> On Fri, Nov 3, 2017 at 10:51 AM, Mark Rutland <mark.rutland@arm.com> wrote:
    >> > I had to create an aarch64-linux-gnu-clang wrapper, too. I'm not sure if
    >> > there's build system help to avoid needing that?
    >>
    >> Gah! So a BIG difference with Clang vs GCC for cross compiling is
    >> that Clang by default ships with all backends enabled, and uses a
    >> `-target <triple>` CFLAG to determine the arch to cross compile for,
    >> while GCC is configured at compile time to support one back end, IIUC.
    >
    > Yup.
    >
    > I initally tried passing CC=clang\ --target=aarch64-linux-gnu
    >
    > ... but since that conflicts with CROSS_COMPILE, you then have to
    > override AS, LD, OBJCOPY, etc, separately too.

    make CC=clang CROSS_COMPILE=aarch64-linux-gnu-

    I think you may need a trailing hyphen on your target as it gets
    prefixed onto as and ld:

    Makefile:

    348 # Make variables (CC, etc...)
    349 AS = $(CROSS_COMPILE)as
    350 LD = $(CROSS_COMPILE)ld

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