From: Nathan Chancellor <natechancellor@gmail.com>
To: Masahiro Yamada <masahiroy@kernel.org>,
Michal Marek <michal.lkml@markovi.net>,
Kees Cook <keescook@chromium.org>
Cc: Russell King <linux@armlinux.org.uk>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>,
Michael Ellerman <mpe@ellerman.id.au>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
x86@kernel.org, Nick Desaulniers <ndesaulniers@google.com>,
Arvind Sankar <nivedita@alum.mit.edu>,
linux-kernel@vger.kernel.org, linux-kbuild@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
linuxppc-dev@lists.ozlabs.org,
clang-built-linux@googlegroups.com,
Nathan Chancellor <natechancellor@gmail.com>,
"kernelci . org bot" <bot@kernelci.org>,
Mark Brown <broonie@kernel.org>
Subject: [PATCH 2/2] kbuild: Disable CONFIG_LD_ORPHAN_WARN for ld.lld 10.0.1
Date: Fri, 13 Nov 2020 12:55:53 -0700 [thread overview]
Message-ID: <20201113195553.1487659-2-natechancellor@gmail.com> (raw)
In-Reply-To: <20201113195553.1487659-1-natechancellor@gmail.com>
ld.lld 10.0.1 spews a bunch of various warnings about .rela sections,
along with a few others. Newer versions of ld.lld do not have these
warnings. As a result, do not add '--orphan-handling=warn' to
LDFLAGS_vmlinux if ld.lld's version is not new enough.
Reported-by: Arvind Sankar <nivedita@alum.mit.edu>
Reported-by: kernelci.org bot <bot@kernelci.org>
Reported-by: Mark Brown <broonie@kernel.org>
Link: https://github.com/ClangBuiltLinux/linux/issues/1187
Link: https://github.com/ClangBuiltLinux/linux/issues/1193
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
---
MAINTAINERS | 1 +
init/Kconfig | 6 +++++-
scripts/lld-version.sh | 20 ++++++++++++++++++++
3 files changed, 26 insertions(+), 1 deletion(-)
create mode 100755 scripts/lld-version.sh
diff --git a/MAINTAINERS b/MAINTAINERS
index 3da6d8c154e4..4b83d3591ec7 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -4284,6 +4284,7 @@ B: https://github.com/ClangBuiltLinux/linux/issues
C: irc://chat.freenode.net/clangbuiltlinux
F: Documentation/kbuild/llvm.rst
F: scripts/clang-tools/
+F: scripts/lld-version.sh
K: \b(?i:clang|llvm)\b
CLEANCACHE API
diff --git a/init/Kconfig b/init/Kconfig
index a270716562de..40c9ca60ac1d 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -47,6 +47,10 @@ config CLANG_VERSION
int
default $(shell,$(srctree)/scripts/clang-version.sh $(CC))
+config LLD_VERSION
+ int
+ default $(shell,$(srctree)/scripts/lld-version.sh $(LD))
+
config CC_CAN_LINK
bool
default $(success,$(srctree)/scripts/cc-can-link.sh $(CC) $(CLANG_FLAGS) $(m64-flag)) if 64BIT
@@ -1349,7 +1353,7 @@ config LD_DEAD_CODE_DATA_ELIMINATION
own risk.
config LD_ORPHAN_WARN
- def_bool ARCH_WANT_LD_ORPHAN_WARN && $(ld-option,--orphan-handling=warn)
+ def_bool ARCH_WANT_LD_ORPHAN_WARN && $(ld-option,--orphan-handling=warn) && (!LD_IS_LLD || LLD_VERSION >= 110000)
config SYSCTL
bool
diff --git a/scripts/lld-version.sh b/scripts/lld-version.sh
new file mode 100755
index 000000000000..cc779f412e39
--- /dev/null
+++ b/scripts/lld-version.sh
@@ -0,0 +1,20 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+#
+# ld.lld-version ld.lld-command
+#
+# Print the linker version of `ld.lld-command' in a 5 or 6-digit form
+# such as `100001' for ld.lld 10.0.1 etc.
+
+linker="$*"
+
+if ! ( $linker --version | grep -q LLD ); then
+ echo 0
+ exit 1
+fi
+
+VERSION=$($linker --version | cut -d ' ' -f 2)
+MAJOR=$(echo $VERSION | cut -d . -f 1)
+MINOR=$(echo $VERSION | cut -d . -f 2)
+PATCHLEVEL=$(echo $VERSION | cut -d . -f 3)
+printf "%d%02d%02d\\n" $MAJOR $MINOR $PATCHLEVEL
--
2.29.2
next prev parent reply other threads:[~2020-11-13 19:56 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-13 19:55 [PATCH 1/2] kbuild: Hoist '--orphan-handling' into Kconfig Nathan Chancellor
2020-11-13 19:55 ` Nathan Chancellor [this message]
2020-11-17 19:41 ` [PATCH 2/2] kbuild: Disable CONFIG_LD_ORPHAN_WARN for ld.lld 10.0.1 Nick Desaulniers
2020-11-18 3:12 ` Nathan Chancellor
2020-11-17 21:51 ` Kees Cook
2020-11-18 3:12 ` Nathan Chancellor
2020-11-17 1:41 ` [PATCH 1/2] kbuild: Hoist '--orphan-handling' into Kconfig Nick Desaulniers
2020-11-17 1:54 ` Nathan Chancellor
2020-11-17 19:26 ` Nick Desaulniers
2020-11-17 11:03 ` Michael Ellerman
2020-11-17 16:22 ` Nathan Chancellor
2020-11-17 21:52 ` Kees Cook
2020-11-19 20:46 ` [PATCH v2 " Nathan Chancellor
2020-11-21 0:08 ` Kees Cook
2020-12-01 13:28 ` Masahiro Yamada
2020-11-19 20:46 ` [PATCH v2 2/2] kbuild: Disable CONFIG_LD_ORPHAN_WARN for ld.lld 10.0.1 Nathan Chancellor
2020-11-19 21:13 ` Nick Desaulniers
2020-11-24 22:22 ` Kees Cook
2020-12-01 13:31 ` Masahiro Yamada
2020-12-01 20:56 ` Kees Cook
2020-12-02 2:37 ` Masahiro Yamada
2020-12-02 18:56 ` Kees Cook
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