efi/libstub: arm: support building with clang
authorAlistair Strachan <astrachan@google.com>
Thu, 9 Aug 2018 16:40:42 +0000 (09:40 -0700)
committerArd Biesheuvel <ard.biesheuvel@linaro.org>
Wed, 26 Sep 2018 10:03:58 +0000 (12:03 +0200)
commit41f1c48420709470c51ee0e54b6fb28b956bb4e0
tree41fb87527c34f75dca504fdc325f7baf3beaf701
parenta23d3bb05ccbd815c79293d2207fedede0b3515d
efi/libstub: arm: support building with clang

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 to c1c386681bd7 ("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>
drivers/firmware/efi/libstub/Makefile