[12/13,3.18-stable] arm64: build vdso without libgcov

Message ID 20170504205209.498721-13-arnd@arndb.de
State New
Headers show
  • backported build fixes
Related show

Commit Message

Arnd Bergmann May 4, 2017, 8:52 p.m.
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 <arnd@arndb.de>

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

Signed-off-by: Arnd Bergmann <arnd@arndb.de>

 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 f6fe17d88da5..b467fd0a384b 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
 # 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