Messages in this thread | | | From | Nick Desaulniers <> | Date | Fri, 3 Nov 2017 11:36:33 -0700 | Subject | Re: [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
| |