mirror of
https://github.com/torvalds/linux.git
synced 2024-11-26 22:21:42 +00:00
9bc19d4730
The -nostdlib option requests the compiler to not use the standard
system startup files or libraries when linking. It is effective only
when $(CC) is used as a linker driver.
Since commit fe00e50b2d ("ARM: 8858/1: vdso: use $(LD) instead of
$(CC) to link VDSO"), $(LD) is directly used, hence -nostdlib is
unneeded.
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
92 lines
2.6 KiB
Makefile
92 lines
2.6 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0
|
|
|
|
# Absolute relocation type $(ARCH_REL_TYPE_ABS) needs to be defined before
|
|
# the inclusion of generic Makefile.
|
|
ARCH_REL_TYPE_ABS := R_ARM_JUMP_SLOT|R_ARM_GLOB_DAT|R_ARM_ABS32
|
|
include $(srctree)/lib/vdso/Makefile
|
|
|
|
hostprogs := vdsomunge
|
|
|
|
obj-vdso := vgettimeofday.o datapage.o note.o
|
|
|
|
# Build rules
|
|
targets := $(obj-vdso) vdso.so vdso.so.dbg vdso.so.raw vdso.lds
|
|
obj-vdso := $(addprefix $(obj)/, $(obj-vdso))
|
|
|
|
ccflags-y := -fPIC -fno-common -fno-builtin -fno-stack-protector
|
|
ccflags-y += -DDISABLE_BRANCH_PROFILING -DBUILD_VDSO32
|
|
|
|
ldflags-$(CONFIG_CPU_ENDIAN_BE8) := --be8
|
|
ldflags-y := -Bsymbolic --no-undefined -soname=linux-vdso.so.1 \
|
|
-z max-page-size=4096 -shared $(ldflags-y) \
|
|
--hash-style=sysv --build-id=sha1 \
|
|
-T
|
|
|
|
obj-$(CONFIG_VDSO) += vdso.o
|
|
CPPFLAGS_vdso.lds += -P -C -U$(ARCH)
|
|
|
|
CFLAGS_REMOVE_vdso.o = -pg
|
|
|
|
# Force -O2 to avoid libgcc dependencies
|
|
CFLAGS_REMOVE_vgettimeofday.o = -pg -Os $(GCC_PLUGINS_CFLAGS)
|
|
ifeq ($(c-gettimeofday-y),)
|
|
CFLAGS_vgettimeofday.o = -O2
|
|
else
|
|
CFLAGS_vgettimeofday.o = -O2 -include $(c-gettimeofday-y)
|
|
endif
|
|
|
|
# Disable gcov profiling for VDSO code
|
|
GCOV_PROFILE := n
|
|
|
|
# Prevents link failures: __sanitizer_cov_trace_pc() is not linked in.
|
|
KCOV_INSTRUMENT := n
|
|
|
|
KASAN_SANITIZE := n
|
|
|
|
# Force dependency
|
|
$(obj)/vdso.o : $(obj)/vdso.so
|
|
|
|
# Link rule for the .so file
|
|
$(obj)/vdso.so.raw: $(obj)/vdso.lds $(obj-vdso) FORCE
|
|
$(call if_changed,vdsold_and_vdso_check)
|
|
|
|
$(obj)/vdso.so.dbg: $(obj)/vdso.so.raw $(obj)/vdsomunge FORCE
|
|
$(call if_changed,vdsomunge)
|
|
|
|
# Strip rule for the .so file
|
|
$(obj)/%.so: OBJCOPYFLAGS := -S
|
|
$(obj)/%.so: $(obj)/%.so.dbg FORCE
|
|
$(call if_changed,objcopy)
|
|
|
|
# Actual build commands
|
|
quiet_cmd_vdsold_and_vdso_check = LD $@
|
|
cmd_vdsold_and_vdso_check = $(cmd_ld); $(cmd_vdso_check)
|
|
|
|
quiet_cmd_vdsomunge = MUNGE $@
|
|
cmd_vdsomunge = $(objtree)/$(obj)/vdsomunge $< $@
|
|
|
|
#
|
|
# Install the unstripped copy of vdso.so.dbg. If our toolchain
|
|
# supports build-id, install .build-id links as well.
|
|
#
|
|
# Cribbed from arch/x86/vdso/Makefile.
|
|
#
|
|
quiet_cmd_vdso_install = INSTALL $<
|
|
define cmd_vdso_install
|
|
cp $< "$(MODLIB)/vdso/vdso.so"; \
|
|
if readelf -n $< | grep -q 'Build ID'; then \
|
|
buildid=`readelf -n $< |grep 'Build ID' |sed -e 's/^.*Build ID: \(.*\)$$/\1/'`; \
|
|
first=`echo $$buildid | cut -b-2`; \
|
|
last=`echo $$buildid | cut -b3-`; \
|
|
mkdir -p "$(MODLIB)/vdso/.build-id/$$first"; \
|
|
ln -sf "../../vdso.so" "$(MODLIB)/vdso/.build-id/$$first/$$last.debug"; \
|
|
fi
|
|
endef
|
|
|
|
$(MODLIB)/vdso: FORCE
|
|
@mkdir -p $(MODLIB)/vdso
|
|
|
|
PHONY += vdso_install
|
|
vdso_install: $(obj)/vdso.so.dbg $(MODLIB)/vdso
|
|
$(call cmd,vdso_install)
|