mirror/buildroot
1
0
Fork 0
mirror of https://gitlab.com/buildroot.org/buildroot.git synced 2026-08-09 17:03:35 -09:00
Code Issues Packages Projects Releases Wiki Activity

configs/qemu_mips64r6: fix Linux kernel build with gcc 10.x

Browse Source 
From [1]

"GCC 10 (PR 91233) won't silently allow registers that are not architecturally
available to be present in the clobber list anymore, resulting in build failure
for mips*r6 targets in form of:
...
.../sysdep.h:146:2: error: the register ‘lo’ cannot be clobbered in ‘asm’ for the current target
  146 |  __asm__ volatile (	 \
      |  ^~~~~~~

This is because base R6 ISA doesn't define hi and lo registers w/o DSP extension.
This patch provides the alternative clobber list for r6 targets that won't include
those registers."

Since kernel 5.4 and mips support for generic vDSO [2], the kernel fails to build
for mips r6 cpus with gcc 10 for the same reason as glibc.

[1] https://sourceware.org/git/?p=glibc.git;a=commit;h=020b2a97bb15f807c0482f0faee2184ed05bcad8
[2] https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=24640f233b466051ad3a5d2786d2951e43026c9d

Fixes:
https://gitlab.com/kubu93/buildroot/-/jobs/655618363
https://gitlab.com/kubu93/buildroot/-/jobs/655618364

Signed-off-by: Romain Naour <romain.naour@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
This commit is contained in:
Romain Naour
2020-07-26 00:06:40 +02:00
committed by Thomas Petazzoni
parent 39a9a0117d
commit 5259a39c7a
4 changed files with 300 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

1
configs/qemu_mips64r6_malta_defconfig
View File

@@ -24,6 +24,7 @@ BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="5.4.42"
BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG=y
BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE="board/qemu/mips64r6-malta/linux.config"
BR2_LINUX_KERNEL_VMLINUX=y
BR2_GLOBAL_PATCH_DIR="board/qemu/mips64r6-malta/patches"
# Serial port config
BR2_TARGET_GENERIC_GETTY=y