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Commit 4f1e2702 authored by Arnd Bergmann's avatar Arnd Bergmann Committed by Mark Salyzyn
Browse files

UPSTREAM: arm64: build vdso without libgcov 



(cherry pick from commit 543097843ca7c9ac3758d0b5879ea2a6f44089de)

On a cross-toolchain without glibc support, libgcov may not be
available, and attempting to build an arm64 kernel with GCOV
enabled then results in a build error:

/home/arnd/cross-gcc/lib/gcc/aarch64-linux/5.2.1/../../../../aarch64-linux/bin/ld: cannot find -lgcov

We don't really want to link libgcov into the vdso anyway, so
this patch just disables GCOV in the vdso directory, just as
we do for most other architectures.

Signed-off-by: default avatarArnd Bergmann <arnd@arndb.de>
Signed-off-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
Bug: 20045882
Bug: 19198045
Change-Id: Ia9431e825918fbdf07f9e62f893449451fe14327
parent 00a94817

arch/arm64/kernel/vdso/Makefile

+3 −0
Original line number Diff line number Diff line
@@ -15,6 +15,9 @@ ccflags-y := -shared -fno-common -fno-builtin 
ccflags-y += -nostdlib -Wl,-soname=linux-vdso.so.1 \

		$(call cc-ldoption, -Wl$(comma)--hash-style=sysv)



# Disable gcov profiling for VDSO code

GCOV_PROFILE := n



# Workaround for bare-metal (ELF) toolchains that neglect to pass -shared

# down to collect2, resulting in silent corruption of the vDSO image.

ccflags-y += -Wl,-shared