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| author | Nathan Chancellor <nathan@kernel.org> | 2023-02-15 21:41:16 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2023-03-14 16:52:10 +0300 |
| commit | 7c3bd8362b06cff0a4044a4975adb7d71db2dfba (patch) | |
| tree | 4d8d6f882c94769ea3c67b21d77346c291410321 /arch/powerpc/Makefile | |
| parent | d1c5accacb234c3a9f1609a73b4b2eaa4ef07d1a (diff) | |
| download | linux-7c3bd8362b06cff0a4044a4975adb7d71db2dfba.tar.xz | |
powerpc: Fix use of '-mabi=elfv2' with clang
'-mabi=elfv2' is not added to clang's invocations when
CONFIG_PPC64_ELF_ABI_V2 is enabled, resulting in the generation of elfv1
code, as evidenced by the orphan section warnings/errors:
ld.lld: error: vmlinux.a(arch/powerpc/kernel/prom_init.o):(.opd) is being placed in '.opd'
ld.lld: error: vmlinux.a(init/main.o):(.opd) is being placed in '.opd'
ld.lld: error: vmlinux.a(init/version.o):(.opd) is being placed in '.opd'
To resolve this, add '-mabi=elfv2' to CFLAGS with clang. This uncovers
an issue in the 32-bit vDSO:
error: unknown target ABI 'elfv2'
The ELFv2 ABI cannot be used when building code for a 32-bit target. To
resolve this, just remove the '-mabi' flags from the assembler flags, as
it was only needed for preprocessing (the _CALL_ELF macro) but this was
cleaned up in commit 5b89492c03e5 ("powerpc: Finalise cleanup around ABI
use").
Tested-by: "Erhard F." <erhard_f@mailbox.org>
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20230118-ppc64-elfv2-llvm-v1-2-b9e2ec9da11d@kernel.org
Diffstat (limited to 'arch/powerpc/Makefile')
| -rw-r--r-- | arch/powerpc/Makefile | 4 |
1 files changed, 1 insertions, 3 deletions
diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile index e91d7e91347d..12447b2361e4 100644 --- a/arch/powerpc/Makefile +++ b/arch/powerpc/Makefile @@ -123,14 +123,12 @@ endif endif CFLAGS-$(CONFIG_PPC64) := $(call cc-option,-mtraceback=no) -ifndef CONFIG_CC_IS_CLANG ifdef CONFIG_PPC64_ELF_ABI_V2 CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mabi=elfv2,$(call cc-option,-mcall-aixdesc)) -AFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mabi=elfv2) else +ifndef CONFIG_CC_IS_CLANG CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mabi=elfv1) CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mcall-aixdesc) -AFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mabi=elfv1) endif endif CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mcmodel=medium,$(call cc-option,-mminimal-toc)) |