[Buildroot] [PATCH 2/3] gnuchess: disable -O2 and -O3 for ARM cortex-M cpus

Thomas Petazzoni thomas.petazzoni at bootlin.com
Thu Jan 10 19:59:37 UTC 2019


Hello,

On Thu, 10 Jan 2019 18:59:54 +0100, Fabrice Fontaine wrote:
> When building with -O2 (or -O3), link fails on:
> 
> /home/rclinux/rc-buildroot-test/scripts/instance-0/output/host/bin/arm-linux-g++ -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64  -O2 -Wl,-elf2flt -static  -Wl,-elf2flt -static   -Wl,-elf2flt -static -o gnuchess main.o components.o  frontend/libfrontend.a adapter/libadapter.a engine/libengine.a -lreadline -lncurses
> ERROR: reloc type R_ARM_THM_MOVW_ABS_NC unsupported in this context
> ERROR: reloc type R_ARM_THM_MOVT_ABS unsupported in this context
> ERROR: reloc type R_ARM_THM_MOVW_ABS_NC unsupported in this context
> ERROR: reloc type R_ARM_THM_MOVT_ABS unsupported in this context
> ERROR: reloc type R_ARM_THM_MOVW_ABS_NC unsupported in this context
> ERROR: reloc type R_ARM_THM_MOVT_ABS unsupported in this context
> ERROR: reloc type R_ARM_THM_MOVW_ABS_NC unsupported in this context

Interesting. In commit
https://git.buildroot.net/buildroot/commit/?id=49f574237983ae2e69e4a4c43df7be98902a63be,
we are doing exactly the opposite: when -Os is used, we pass -O2.

Romain reported the issue at
https://sourceware.org/bugzilla/show_bug.cgi?id=20552, and as you can
see, we got a tremendous amount of feedback from the binutils
developers :-)

Thomas
-- 
Thomas Petazzoni, CTO, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com


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