Hello Waldemar Brodkorb,
seems this is triggered if gcc (also with older versions) compiles for
coretex-a53
if thumb-mode is enabled. (So this would trigger if e.g.
raspberrypi3_defconfig
gets thumb mode enabled or if you change vexpress_defconfig to compile for
a53.)
The error output from gcc is:
AS ldso/ldso/arm/thumb_atomics.oS
ldso/ldso/arm/thumb_atomics.S: Assembler messages:
ldso/ldso/arm/thumb_atomics.S:49: Error: swp{b} use is obsoleted for ARMv8
and later
ldso/ldso/arm/thumb_atomics.S:55: Error: swp{b} use is obsoleted for ARMv8
and later
Makerules:373: recipe for target 'ldso/ldso/arm/thumb_atomics.oS' failed
How to reproduce this:
git clone https://github.com/buildroot/buildroot.git
pushd buildroot
patch -s -p1 < ../buildroot.patch
make qemu_arm_vexpress_defconfig
make
popd
with buildroot.patch:
diff --git a/configs/qemu_arm_vexpress_defconfig
b/configs/qemu_arm_vexpress_defconfig
index 34a50aa8d5..2f3e8a7c54 100644
--- a/configs/qemu_arm_vexpress_defconfig
+++ b/configs/qemu_arm_vexpress_defconfig
@@ -1,9 +1,11 @@
# Architecture
BR2_arm=y
-BR2_cortex_a9=y
+BR2_cortex_a53=y
BR2_ARM_ENABLE_NEON=y
BR2_ARM_ENABLE_VFP=y
-BR2_ARM_FPU_VFPV3D16=y
+BR2_ARM_FPU_VFPV4=y
+
+BR2_ARM_INSTRUCTIONS_THUMB2=y
# System
BR2_SYSTEM_DHCP="eth0"
Do you know which software depends on this spcial function to exist in
uclibc-ng?
best regards,
Florian La Roche
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