[Buildroot] [PATCH 0/2] Introduce and work-around bug 101915 on lmbench

[Buildroot] [PATCH 0/2] Introduce and work-around bug 101915 on lmbench

[Giulio Benetti]

This patchset introduce gcc bug 101915 and reference to it in lmbench to work
it around by disabling optimization(-O0).

Giulio Benetti (2):
  toolchain: introduce BR2_TOOLCHAIN_HAS_GCC_BUG_101915
  package/lmbench: fix build failure due to gcc bug 101915

 package/lmbench/lmbench.mk | 4 ++++
 toolchain/Config.in        | 7 +++++++
 2 files changed, 11 insertions(+)

-- 
2.25.1

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[Buildroot] [PATCH 1/2] toolchain: introduce BR2_TOOLCHAIN_HAS_GCC_BUG_101915

[Giulio Benetti]

lmbench package fails to build for the Microblaze architecture with
optimization enabled with gcc = 11.1.0:
http://autobuild.buildroot.net/results/ae1/ae1e4d61ed367c6cb64442c60d98882cc7985346/

It's been reported upstream:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101915

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 3888eeafe2..07320fdef9 100644
--- a/toolchain/Config.in
+++ b/toolchain/Config.in
@@ -177,6 +177,13 @@ config BR2_TOOLCHAIN_HAS_GCC_BUG_101737
 	bool
 	default y if BR2_sh4
 
+# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101915
+# ICE: in extract_insn, at recog.c:2294 on microblaze.
+# This bug still exists in gcc = 11.1.0
+config BR2_TOOLCHAIN_HAS_GCC_BUG_101915
+	bool
+	default y if BR2_microblaze
+
 config BR2_TOOLCHAIN_HAS_NATIVE_RPC
 	bool
 
-- 
2.25.1

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[Buildroot] [PATCH 2/2] package/lmbench: fix build failure due to gcc bug 101915

[Giulio Benetti]

The lmbench package exhibits gcc bug 101915 when built for the
Microblaze 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_101915=y.

Fixes:
http://autobuild.buildroot.net/results/ae1/ae1e4d61ed367c6cb64442c60d98882cc7985346/

Signed-off-by: Giulio Benetti <giulio.benetti@benettiengineering.com>
---
 package/lmbench/lmbench.mk | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/package/lmbench/lmbench.mk b/package/lmbench/lmbench.mk
index 2f3b19b5f8..b0f99ff106 100644
--- a/package/lmbench/lmbench.mk
+++ b/package/lmbench/lmbench.mk
@@ -18,6 +18,10 @@ LMBENCH_CFLAGS += `$(PKG_CONFIG_HOST_BINARY) --cflags libtirpc`
 LMBENCH_LDLIBS = `$(PKG_CONFIG_HOST_BINARY) --libs libtirpc`
 endif
 
+ifeq ($(BR2_TOOLCHAIN_HAS_GCC_BUG_101915),y)
+LMBENCH_CFLAGS += -O0
+endif
+
 LMBENCH_POST_PATCH_HOOKS += UPDATE_CONFIG_HOOK
 
 define LMBENCH_CONFIGURE_CMDS
-- 
2.25.1

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Re: [Buildroot] [PATCH 0/2] Introduce and work-around bug 101915 on lmbench

[Thomas Petazzoni]

On Sat, 14 Aug 2021 23:52:05 +0200
Giulio Benetti <giulio.benetti@benettiengineering.com> wrote:

> This patchset introduce gcc bug 101915 and reference to it in lmbench to work
> it around by disabling optimization(-O0).
> 
> Giulio Benetti (2):
>   toolchain: introduce BR2_TOOLCHAIN_HAS_GCC_BUG_101915
>   package/lmbench: fix build failure due to gcc bug 101915

Applied to master, thanks.

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