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arm64: Make CPU_BIG_ENDIAN depend on ld.bfd or ld.lld 13.0.0+

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commit e9c6deee00e9197e75cd6aa0d265d3d45bd7cc28 upstream

Similar to commit 28187dc8ebd9 ("ARM: 9025/1: Kconfig: CPU_BIG_ENDIAN
depends on !LD_IS_LLD"), ld.lld prior to 13.0.0 does not properly
support aarch64 big endian, leading to the following build error when
CONFIG_CPU_BIG_ENDIAN is selected:

ld.lld: error: unknown emulation: aarch64linuxb

This has been resolved in LLVM 13. To avoid errors like this, only allow
CONFIG_CPU_BIG_ENDIAN to be selected if using ld.bfd or ld.lld 13.0.0
and newer.

While we are here, the indentation of this symbol used spaces since its
introduction in commit a872013d6d ("arm64: kconfig: allow
CPU_BIG_ENDIAN to be selected"). Change it to tabs to be consistent with
kernel coding style.

Link: https://github.com/ClangBuiltLinux/linux/issues/380
Link: https://github.com/ClangBuiltLinux/linux/issues/1288
Link: 7605a9a009
Link: eea34aae2e
Reported-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Link: https://lore.kernel.org/r/20210209005719.803608-1-nathan@kernel.org
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Nathan Chancellor 2021-02-08 17:57:20 -07:00 committed by Greg Kroah-Hartman
parent a6425142f5
commit 7215d7742d
1 changed files with 3 additions and 2 deletions
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5
arch/arm64/Kconfig
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@ -950,8 +950,9 @@ choice
that is selected here.
config CPU_BIG_ENDIAN
bool "Build big-endian kernel"
help
bool "Build big-endian kernel"
depends on !LD_IS_LLD || LLD_VERSION >= 130000
help
Say Y if you plan on running a kernel with a big-endian userspace.
config CPU_LITTLE_ENDIAN