diff options
| author | Nathan Chancellor <natechancellor@gmail.com> | 2020-11-19 13:46:58 -0700 |
|---|---|---|
| committer | Masahiro Yamada <masahiroy@kernel.org> | 2020-12-01 22:46:06 +0900 |
| commit | d5750cd3c5486e9c0fa11100df01de8ca0c13fa7 (patch) | |
| tree | 26a4b057cdca2ac3fdf9ba54d8732b3a9f4bd5c5 | |
| parent | 59612b24f78a0b61fe078ec9dff2e48e9cec52c0 (diff) | |
| download | lwn-d5750cd3c5486e9c0fa11100df01de8ca0c13fa7.tar.gz lwn-d5750cd3c5486e9c0fa11100df01de8ca0c13fa7.zip | |
kbuild: Disable CONFIG_LD_ORPHAN_WARN for ld.lld 10.0.1
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.
Link: https://github.com/ClangBuiltLinux/linux/issues/1187
Link: https://github.com/ClangBuiltLinux/linux/issues/1193
Reported-by: Arvind Sankar <nivedita@alum.mit.edu>
Reported-by: kernelci.org bot <bot@kernelci.org>
Reported-by: Mark Brown <broonie@kernel.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
| -rw-r--r-- | MAINTAINERS | 1 | ||||
| -rw-r--r-- | init/Kconfig | 5 | ||||
| -rwxr-xr-x | scripts/lld-version.sh | 20 |
3 files changed, 26 insertions, 0 deletions
diff --git a/MAINTAINERS b/MAINTAINERS index a008b70f3c16..286ed8e6b924 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -4274,6 +4274,7 @@ 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 92c58b45abb8..b9037d6c5ab3 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 @@ -1351,6 +1355,7 @@ config LD_DEAD_CODE_DATA_ELIMINATION config LD_ORPHAN_WARN def_bool y depends on ARCH_WANT_LD_ORPHAN_WARN + depends on !LD_IS_LLD || LLD_VERSION >= 110000 depends on $(ld-option,--orphan-handling=warn) config SYSCTL diff --git a/scripts/lld-version.sh b/scripts/lld-version.sh new file mode 100755 index 000000000000..d70edb4d8a4f --- /dev/null +++ b/scripts/lld-version.sh @@ -0,0 +1,20 @@ +#!/bin/sh +# SPDX-License-Identifier: GPL-2.0 +# +# Usage: $ ./scripts/lld-version.sh ld.lld +# +# Print the linker version of `ld.lld' in a 5 or 6-digit form +# such as `100001' for ld.lld 10.0.1 etc. + +linker_string="$($* --version)" + +if ! ( echo $linker_string | grep -q LLD ); then + echo 0 + exit 1 +fi + +VERSION=$(echo $linker_string | cut -d ' ' -f 2) +MAJOR=$(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 |