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(commit41f1c48420upstream) When building with CONFIG_EFI and CONFIG_EFI_STUB on ARM, the libstub Makefile would use -mno-single-pic-base without checking it was supported by the compiler. As the ARM (32-bit) clang backend does not support this flag, the build would fail. This changes the Makefile to check the compiler's support for -mno-single-pic-base before using it, similar toc1c386681b("ARM: 8767/1: add support for building ARM kernel with clang"). Signed-off-by: Alistair Strachan <astrachan@google.com> Reviewed-by: Stefan Agner <stefan@agner.ch> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> [ND: adjusted due to missing commitce279d374f("efi/libstub: Only disable stackleak plugin for arm64")] Signed-off-by: Nick Desaulniers <ndesaulniers@google.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>