3d552b93e0
Backport commit 6ddb09145930b03c88e63f5930e718a33501024d Support CC=clang and LD=ld.lld & add clang llvm lld requires
60 lines
2.2 KiB
Diff
60 lines
2.2 KiB
Diff
From cfe6363124a0d0495727c6f4e8a1809b295a8cbf Mon Sep 17 00:00:00 2001
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From: liyunfei <liyunfei33@huawei.com>
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Date: Wed, 13 Sep 2023 10:05:33 +0800
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Subject: [PATCH] Support CC=clang and LD=ld.lld When building the Linux
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kernel, one may use `make LLVM=1` to set multiple flags, akin to `make
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CC=clang LD=ld.lld NM=llvm-nm ...` (see the link below for kernel docs
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explaining this further in detail).
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When building kernel modules, to ensure we're using the same toolchain
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as the underlying core kernel image, Kbuild will error if it's reinvoked
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with a toolchain that differs. This causes DKMS to fail, since it's not
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re-specifying the same compiler (or linker, etc).
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Check the .comment section of the vmlinux file in the Linux kernel
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source dir, and set CC= and LD= flags for make based on that.
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If vmlinux does not exist, grep .config for CONFIG_CC_IS_CLANG=y and
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CONFIG_LD_IS_LLD=y.
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Fixes: #124
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Fixes: ClangBuiltLinux/linux#1104
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Link: https://docs.kernel.org/kbuild/llvm.html
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Suggested-by: Colin Ian King <colin.king@canonical.com>
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Signed-off-by: Nick Desaulniers <nick.desaulniers@gmail.com>
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---
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dkms | 17 +++++++++++++++++
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1 file changed, 17 insertions(+)
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diff --git a/dkms b/dkms
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index c4b9a26..983aefc 100755
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--- a/dkms
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+++ b/dkms
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@@ -699,6 +699,23 @@ read_conf()
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[[ ${MODULES_CONF[$index]} ]] && modules_conf_array[$index]="${MODULES_CONF[$index]}"
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done
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+ # Check if clang was used to compile or lld was used to link the kernel.
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+ if [[ -e $kernel_source_dir/vmlinux ]]; then
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+ if readelf -p .comment $kernel_source_dir/vmlinux | grep -q clang; then
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+ make_command="${make_command} CC=clang"
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+ fi
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+ if readelf -p .comment $kernel_source_dir/vmlinux | grep -q LLD; then
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+ make_command="${make_command} LD=ld.lld"
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+ fi
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+ elif [[ -e $kernel_source_dir/.config ]]; then
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+ if grep -q CONFIG_CC_IS_CLANG=y $kernel_source_dir/.config; then
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+ make_command="${make_command} CC=clang"
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+ fi
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+ if grep -q CONFIG_LD_IS_LLD=y $kernel_source_dir/.config; then
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+ make_command="${make_command} LD=ld.lld"
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+ fi
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+ fi
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+
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# Set patch_array (including kernel specific patches)
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count=0
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for ((index=0; index < ${#PATCH[@]}; index++)); do
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--
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2.27.0
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