* [Buildroot] [git commit] arch/Config.in.arm: drop support for iwmmxt architecture variant
@ 2022-09-25 12:06 Yann E. MORIN
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From: Yann E. MORIN @ 2022-09-25 12:06 UTC (permalink / raw)
To: buildroot
commit: https://git.buildroot.net/buildroot/commit/?id=6211c9e38112c611b61f00787fd790a8612328a1
branch: https://git.buildroot.net/buildroot/commit/?id=refs/heads/master
This architecture variant is broken in GCC, causing build failures:
../../../libgcc/config/arm/unwind-arm.c:467:1: error: unrecognizable insn:
467 | }
| ^
(insn 2 4 3 2 (set (reg/v/f:SI 118 [ p ])
(reg:SI 0 r0 [ p ])) "../../../libgcc/config/arm/unwind-arm.c":456:1 -1
(nil))
during RTL pass: vregs
../../../libgcc/config/arm/unwind-arm.c:467:1: internal compiler error: in extract_insn, at recog.c:2770
Reported to the GCC developers, the feedback was "iwmmxt support is
definitely bitrotten and most likely should be removed from GCC.".
See:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106972#c1
So this commit simply drops support for iwmmxt, which anyway is
probably barely used nowadays: it's for old Marvell PXA cores that
implemented a special SIMD instruction set. The BR2_xscale option can
be used instead, it's just that it won't use this SIMD instruction
set.
Fixes:
http://autobuild.buildroot.net/results/8e4c4512902c34d8ec0c6f8dfff92b7a198e4b4a/
and the numerous other build failures at:
http://autobuild.buildroot.net/?reason=host-gcc-initial%&subarch=iwmmxt
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
---
Config.in.legacy | 10 ++++++++++
arch/Config.in.arm | 5 -----
package/pixman/pixman.mk | 9 ++-------
3 files changed, 12 insertions(+), 12 deletions(-)
diff --git a/Config.in.legacy b/Config.in.legacy
index 5f7274e84b..5892dfd44f 100644
--- a/Config.in.legacy
+++ b/Config.in.legacy
@@ -146,6 +146,16 @@ endif
comment "Legacy options removed in 2022.11"
+config BR2_iwmmxt
+ bool "ARM iwmmxt variant removed"
+ select BR2_LEGACY
+ help
+ Support for the ARM iwmmxt architecture variant in GCC has
+ bitroten and is no longer maintained. GCC maintainers
+ recommend to no longer use it, and suggest to use "xscale"
+ as a replacement architecture variant. See
+ https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106972
+
config BR2_PACKAGE_GPSD_OLDSTYLE
bool "gpsd oldstyle removed"
select BR2_LEGACY
diff --git a/arch/Config.in.arm b/arch/Config.in.arm
index c391d6c72b..78621e321c 100644
--- a/arch/Config.in.arm
+++ b/arch/Config.in.arm
@@ -129,10 +129,6 @@ config BR2_arm926t
select BR2_ARM_CPU_MAYBE_HAS_VFPV2
select BR2_ARM_CPU_HAS_THUMB
select BR2_ARM_CPU_ARMV5
-config BR2_iwmmxt
- bool "iwmmxt"
- select BR2_ARM_CPU_HAS_ARM
- select BR2_ARM_CPU_ARMV5
config BR2_xscale
bool "xscale"
select BR2_ARM_CPU_HAS_ARM
@@ -817,7 +813,6 @@ config BR2_GCC_TARGET_CPU
default "strongarm" if BR2_strongarm
# armv5
default "arm926ej-s" if BR2_arm926t
- default "iwmmxt" if BR2_iwmmxt
default "xscale" if BR2_xscale
# armv6
default "arm1136j-s" if BR2_arm1136j_s
diff --git a/package/pixman/pixman.mk b/package/pixman/pixman.mk
index 64302fa49a..3f65f0484d 100644
--- a/package/pixman/pixman.mk
+++ b/package/pixman/pixman.mk
@@ -21,7 +21,8 @@ PIXMAN_AUTORECONF = YES
# don't build gtk based demos
PIXMAN_CONF_OPTS = \
--disable-gtk \
- --disable-loongson-mmi
+ --disable-loongson-mmi \
+ --disable-arm-iwmmxt
# The ARM SIMD code from pixman requires a recent enough ARM core, but
# there is a runtime CPU check that makes sure it doesn't get used if
@@ -40,12 +41,6 @@ else
PIXMAN_CONF_OPTS += --disable-arm-neon
endif
-# disable iwmmxt support for CPU's that don't have
-# this feature
-ifneq ($(BR2_iwmmxt),y)
-PIXMAN_CONF_OPTS += --disable-arm-iwmmxt
-endif
-
PIXMAN_CFLAGS = $(TARGET_CFLAGS)
# toolchain gets confused about TLS access through GOT (PIC), so disable TLS
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2022-09-25 12:06 [Buildroot] [git commit] arch/Config.in.arm: drop support for iwmmxt architecture variant Yann E. MORIN
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