Broken arm support in clang now?

[Dimitry Andric]

On 11 Aug 2018, at 16:55, Warner Losh <imp at bsdimp.com> wrote:
> 
> It looks like armv5 clang bogusly uses lld:
> 
> From a 'make buildkernel' of the RT1310 kernel config:
> 
> cc -target arm-gnueabi-freebsd12.0
> --sysroot=/usr/home/imp/obj/usr/home/imp/git/head/arm.arm/tmp
> -B/usr/home/imp/obj/usr/home/imp/git/head/arm.arm/tmp/usr/bin -c -O -pipe
> -g -nostdinc  -I. -I/usr/home/imp/git/head/sys
> -I/usr/home/imp/git/head/sys/contrib/ck/include
> -I/usr/home/imp/git/head/sys/contrib/libfdt
> -I/usr/home/imp/git/head/sys/gnu/dts/include -D_KERNEL
> -DHAVE_KERNEL_OPTION_HEADERS -include opt_global.h -march=armv5te
> -funwind-tables  -ffreestanding -fwrapv -gdwarf-2 -Wall -Wredundant-decls
> -Wnested-externs -Wstrict-prototypes -Wmissing-prototypes -Wpointer-arith
> -Wcast-qual -Wundef -Wno-pointer-sign -D__printf__=__freebsd_kprintf__
> -Wmissing-include-dirs -fdiagnostics-show-option -Wno-unknown-pragmas
> -Wno-error-tautological-compare -Wno-error-empty-body
> -Wno-error-parentheses-equality -Wno-error-unused-function
> -Wno-error-pointer-sign -Wno-error-shift-negative-value
> -Wno-address-of-packed-member  -mfpu=none  -std=iso9899:1999 -Werror  vers.c
> linking kernel.full
> ld: warning: lld uses extended branch encoding, no object with architecture
> supporting feature detected.
> ld: warning: lld may use movt/movw, no object with architecture supporting
> feature detected.
>     text     data      bss       dec        hex   filename
>  3448944   176776   655360   4281080   0x4152f8   kernel.full
> 
> Any clues on how I can track this down?

What does /usr/bin/ld -v output?  As far as I can see, MK_LLD_BOOTSTRAP
and MK_LLD_IS_LD are only enabled by default for aarch64 and amd64.  So
do you have any of those settings in your src.conf or environment?

-Dimitry

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