clang/ld.lld build fails with `can't create dynamic relocation R_PPC64_ADDR64 against local symbol in readonly segment`
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From: Paul Menzel <hidden>
Date: 2021-07-29 08:23:59
Dear Linux folks,
I just wanted to make you aware that building Linux for ppc64le with clang/lld.ld fails with [1]:
ld.lld: error: can't create dynamic relocation R_PPC64_ADDR64 against symbol: empty_zero_page in readonly segment; recompile object files with -fPIC or pass '-Wl,-z,notext' to allow text relocations in the output
>>> defined in arch/powerpc/kernel/head_64.o
>>> referenced by arch/powerpc/kernel/head_64.o:(___ksymtab+empty_zero_page+0x0)
The patch below from one of the comments [2] fixes it.
--- i/arch/powerpc/Makefile
+++ w/arch/powerpc/Makefile@@ -122,7 +122,7 @@ cflags-$(CONFIG_STACKPROTECTOR) += -mstack-protector-guard-reg=r2 endif LDFLAGS_vmlinux-y := -Bstatic -LDFLAGS_vmlinux-$(CONFIG_RELOCATABLE) := -pie +LDFLAGS_vmlinux-$(CONFIG_RELOCATABLE) := -pie -z notext LDFLAGS_vmlinux := $(LDFLAGS_vmlinux-y) LDFLAGS_vmlinux += $(call ld-option,--orphan-handling=warn)
Kind regards, Paul [1]: https://github.com/ClangBuiltLinux/linux/issues/811 [2]: https://github.com/ClangBuiltLinux/linux/issues/811#issuecomment-568316320