From: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
To: buildroot@busybox.net
Subject: [Buildroot] [PATCH v2,1/1] gnuchess: needs -fPIC
Date: Sun, 13 Jan 2019 14:13:29 +0100 [thread overview]
Message-ID: <20190113141329.4d526438@windsurf.home> (raw)
In-Reply-To: <20190112175505.14348-1-fontaine.fabrice@gmail.com>
Hello Fabrice,
On Sat, 12 Jan 2019 18:55:05 +0100, Fabrice Fontaine wrote:
> When building with -O2 (or -O3) on ARM cortex-M cpus, 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
>
> To fix this, pas -fPIC unconditionnally
>
> Fixes:
> - http://autobuild.buildroot.org/results/7918757b255ed41609609d2083c2d8904ff3136e
>
> Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
I'm sorry but this doesn't make sense to me. -fPIC is for Position
Independent Code, which is needed when building shared libraries. Here
we are building with -static on Cortex-M which doesn't even have
support for shared libraries. So building with -fPIC doesn't make sense
I believe. It seems to be more a workaround than a real fix.
Perhaps this should be discussed with upstream binutils, or at least a
proper investigation be done about those relocation types ?
Best regards,
Thomas
--
Thomas Petazzoni, CTO, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com
next prev parent reply other threads:[~2019-01-13 13:13 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-12 17:55 [Buildroot] [PATCH v2,1/1] gnuchess: needs -fPIC Fabrice Fontaine
2019-01-13 13:13 ` Thomas Petazzoni [this message]
2019-01-23 14:21 ` Arnout Vandecappelle
2019-02-04 17:55 ` Peter Korsgaard
2019-06-23 18:23 ` Thomas Petazzoni
2019-06-25 21:04 ` Peter Korsgaard
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