From 2a6497e927b8b7e4c7c8f9f985e4eb7cca1bf533 Mon Sep 17 00:00:00 2001 From: Arnd Bergmann Date: Thu, 12 Nov 2015 15:37:12 +0100 Subject: arm64: build vdso without libgcov commit 543097843ca7c9ac3758d0b5879ea2a6f44089de upstream. 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: Arnd Bergmann Signed-off-by: Catalin Marinas Signed-off-by: Greg Kroah-Hartman --- arch/arm64/kernel/vdso/Makefile | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/arm64/kernel/vdso/Makefile b/arch/arm64/kernel/vdso/Makefile index fdda6dd71..d5a81be78 100644 --- a/arch/arm64/kernel/vdso/Makefile +++ b/arch/arm64/kernel/vdso/Makefile @@ -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 -- cgit v1.2.3