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@xxxxxxxxxxxx> Reported-by: kernelci.org bot <bot@xxxxxxxxxxxx> Reported-by: Mark Brown <broonie@xxxxxxxxxx> Link: https://github.com/ClangBuiltLinux/linux/issues/1187 Link: https://github.com/ClangBuiltLinux/linux/issues/1193 Signed-off-by: Nathan Chancellor <natechancellor@xxxxxxxxx> --- 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
