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Date: Tue, 21 Aug 2018 15:34:53 +0200 From: Ard Biesheuvel <ard.biesheuvel@...aro.org> To: Stefan Agner <stefan@...er.ch> Cc: Alistair Strachan <astrachan@...gle.com>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, Will Deacon <will.deacon@....com>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Russell King <linux@...linux.org.uk>, linux-efi <linux-efi@...r.kernel.org>, linux-arm-kernel <linux-arm-kernel@...ts.infradead.org> Subject: Re: [PATCH] efi/libstub: arm: support building with clang On 11 August 2018 at 10:49, Stefan Agner <stefan@...er.ch> wrote: > On 09.08.2018 18:40, Alistair Strachan wrote: >> 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"). > > Looks good to me: > > Reviewed-by: Stefan Agner <stefan@...er.ch> > Thanks. I will queue this after the merge window closes >> >> Cc: Stefan Agner <stefan@...er.ch> >> Cc: Ard Biesheuvel <ard.biesheuvel@...aro.org> >> Cc: Will Deacon <will.deacon@....com> >> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org> >> Cc: Russell King <linux@...linux.org.uk> >> Cc: linux-efi@...r.kernel.org >> Cc: linux-arm-kernel@...ts.infradead.org >> Signed-off-by: Alistair Strachan <astrachan@...gle.com> >> --- >> drivers/firmware/efi/libstub/Makefile | 3 ++- >> 1 file changed, 2 insertions(+), 1 deletion(-) >> >> diff --git a/drivers/firmware/efi/libstub/Makefile >> b/drivers/firmware/efi/libstub/Makefile >> index a34e9290a699..91339d13f2a1 100644 >> --- a/drivers/firmware/efi/libstub/Makefile >> +++ b/drivers/firmware/efi/libstub/Makefile >> @@ -13,7 +13,8 @@ cflags-$(CONFIG_X86) += -m$(BITS) -D__KERNEL__ -O2 \ >> >> cflags-$(CONFIG_ARM64) := $(subst -pg,,$(KBUILD_CFLAGS)) -fpie >> cflags-$(CONFIG_ARM) := $(subst -pg,,$(KBUILD_CFLAGS)) \ >> - -fno-builtin -fpic -mno-single-pic-base >> + -fno-builtin -fpic \ >> + $(call cc-option,-mno-single-pic-base) >> >> cflags-$(CONFIG_EFI_ARMSTUB) += -I$(srctree)/scripts/dtc/libfdt
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