[Buildroot] [PATCH 0/2] Introduce and work-around bug 101952 on bullet

[Buildroot] [PATCH 0/2] Introduce and work-around bug 101952 on bullet

[Giulio Benetti]

This patchset introduce gcc bug 101952 and reference to it in bullet to
work it around by disabling optimization(-O0).

NOTE: this patchset must be applied *after* this patchset:
https://patchwork.ozlabs.org/project/buildroot/list/?series=258074

Giulio Benetti (2):
  toolchain: introduce BR2_TOOLCHAIN_HAS_GCC_BUG_101952
  package/bullet: fix build failure due to gcc bug 101952

 package/bullet/bullet.mk | 2 +-
 toolchain/Config.in      | 7 +++++++
 2 files changed, 8 insertions(+), 1 deletion(-)

-- 
2.25.1

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[Buildroot] [PATCH 1/2] toolchain: introduce BR2_TOOLCHAIN_HAS_GCC_BUG_101952

[Giulio Benetti]

bullet package fails to build for the SH4 architecture with optimization
enabled with gcc = 11.1.0:
http://autobuild.buildroot.net/results/32b/32bfaf0aae57ed18c18e82a72a958af9b3e1b241/

It's been reported upstream:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101952

Signed-off-by: Giulio Benetti <giulio.benetti@benettiengineering.com>
---
 toolchain/Config.in | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/toolchain/Config.in b/toolchain/Config.in
index c3edf8f48d..d9a49e87e6 100644
--- a/toolchain/Config.in
+++ b/toolchain/Config.in
@@ -191,6 +191,13 @@ config BR2_TOOLCHAIN_HAS_GCC_BUG_101916
 	bool
 	default y if BR2_sh4
 
+# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101952
+# ICE: on SH4: unaligned opcodes detected in executable segment.
+# This bug still exists in gcc = 11.1.0
+config BR2_TOOLCHAIN_HAS_GCC_BUG_101952
+	bool
+	default y if BR2_sh4
+
 config BR2_TOOLCHAIN_HAS_NATIVE_RPC
 	bool
 
-- 
2.25.1

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[Buildroot] [PATCH 2/2] package/bullet: fix build failure due to gcc bug 101952

[Giulio Benetti]

The bullet package exhibits gcc bug 101952 when built for the SH4
architecture with optimization enabled, which causes a build failure.

As done for other packages in Buildroot work around this gcc bug by
setting optimization to -O0 if BR2_TOOLCHAIN_HAS_GCC_BUG_101952=y like we
already do for BR2_TOOLCHAIN_HAS_GCC_BUG_85180=y.

Fixes:
http://autobuild.buildroot.net/results/32b/32bfaf0aae57ed18c18e82a72a958af9b3e1b241/

Signed-off-by: Giulio Benetti <giulio.benetti@benettiengineering.com>
---
 package/bullet/bullet.mk | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/package/bullet/bullet.mk b/package/bullet/bullet.mk
index 01931b58a8..cc72be7c60 100644
--- a/package/bullet/bullet.mk
+++ b/package/bullet/bullet.mk
@@ -24,7 +24,7 @@ endif
 
 BULLET_CXXFLAGS = $(TARGET_CXXFLAGS)
 
-ifeq ($(BR2_TOOLCHAIN_HAS_GCC_BUG_85180),y)
+ifneq ($(BR2_TOOLCHAIN_HAS_GCC_BUG_85180)$(BR2_TOOLCHAIN_HAS_GCC_BUG_101952),)
 BULLET_CXXFLAGS += -O0
 endif
 
-- 
2.25.1

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Re: [Buildroot] [PATCH 0/2] Introduce and work-around bug 101952 on bullet

[Thomas Petazzoni]

On Tue, 17 Aug 2021 23:31:10 +0200
Giulio Benetti <giulio.benetti@benettiengineering.com> wrote:

> Giulio Benetti (2):
>   toolchain: introduce BR2_TOOLCHAIN_HAS_GCC_BUG_101952
>   package/bullet: fix build failure due to gcc bug 101952

Both applied. Thanks!

Thomas
-- 
Thomas Petazzoni, co-owner and CEO, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com
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