From mboxrd@z Thu Jan 1 00:00:00 1970 From: Arnout Vandecappelle Date: Sat, 19 Mar 2016 16:53:16 +0100 Subject: [Buildroot] [PATCH v2 06/17] uclibc: gcc >= 4.9 can build a thumb/thread uclibc In-Reply-To: <1458335299-27409-7-git-send-email-thomas.petazzoni@free-electrons.com> References: <1458335299-27409-1-git-send-email-thomas.petazzoni@free-electrons.com> <1458335299-27409-7-git-send-email-thomas.petazzoni@free-electrons.com> Message-ID: <56ED75EC.7050409@mind.be> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: buildroot@busybox.net On 03/18/16 22:08, Thomas Petazzoni wrote: > Older gcc were not capable of building a uClibc library, with threads > enabled, in Thumb1. However, the issues have been fixed since gcc 4.9, > so this commit narrows down the condition to just gcc 4.7 and 4.8. > > Signed-off-by: Thomas Petazzoni Reviewed-by: Arnout Vandecappelle (Essensium/Mind) > --- > package/uclibc/uclibc.mk | 6 ++++-- > 1 file changed, 4 insertions(+), 2 deletions(-) > > diff --git a/package/uclibc/uclibc.mk b/package/uclibc/uclibc.mk > index c981d80..ad94494 100644 > --- a/package/uclibc/uclibc.mk > +++ b/package/uclibc/uclibc.mk > @@ -75,8 +75,10 @@ define UCLIBC_ARM_ABI_CONFIG > $(call KCONFIG_ENABLE_OPT,CONFIG_ARM_EABI,$(@D)/.config) > endef > > -# Thumb build is broken with threads, build in ARM mode > -ifeq ($(BR2_ARM_INSTRUCTIONS_THUMB)$(BR2_TOOLCHAIN_HAS_THREADS),yy) > +# Thumb1 build is broken with threads with old gcc versions (4.7 and > +# 4.8). Since all cores supporting Thumb1 also support ARM, we use ARM > +# code in this case. > +ifeq ($(BR2_GCC_VERSION_4_7_X)$(BR2_GCC_VERSION_4_8_X):$(BR2_ARM_INSTRUCTIONS_THUMB)$(BR2_TOOLCHAIN_HAS_THREADS),y:yy) This line is a bit long so would be nicer to split off into separate variables. This kind of logic is also much easier to do (and certainly easier to understand) in Kconfig than in the make language - like we had for BX before you removed it. However, that is something for another patch, so my Rev-by stands. Regards, Arnout > UCLIBC_EXTRA_CFLAGS += -marm > endif > > -- Arnout Vandecappelle arnout at mind be Senior Embedded Software Architect +32-16-286500 Essensium/Mind http://www.mind.be G.Geenslaan 9, 3001 Leuven, Belgium BE 872 984 063 RPR Leuven LinkedIn profile: http://www.linkedin.com/in/arnoutvandecappelle GPG fingerprint: 7493 020B C7E3 8618 8DEC 222C 82EB F404 F9AC 0DDF