mirror of
https://github.com/torvalds/linux.git
synced 2026-05-12 16:18:45 +02:00
ec4c28276c
Introduce CC_FLAGS_DIALECT to make it easier to update the various places in the tree that rely on the GNU C standard and Microsoft extensions flags atomically. All remaining uses of '-std=gnu11' and '-fms-extensions' are in the tools directory (which has its own build system) and other standalone Makefiles. This will allow the kernel to use a narrower option to enable the Microsoft anonymous tagged structure extension in a simpler manner. Place the CC_FLAGS_DIALECT block after the configuration include (so that a future change can move the selection of the flag to Kconfig) but before the arch/$(SRCARCH)/Makefile include (so that CC_FLAGS_DIALECT is available for use in those Makefiles). Signed-off-by: Nathan Chancellor <nathan@kernel.org> Reviewed-by: Nicolas Schier <nsc@kernel.org> Acked-by: Ard Biesheuvel <ardb@kernel.org> Acked-by: Helge Deller <deller@gmx.de> # parisc Link: https://patch.msgid.link/20260223-fms-anonymous-structs-v1-1-8ee406d3c36c@kernel.org Signed-off-by: Nicolas Schier <nsc@kernel.org>
90 lines
2.4 KiB
Makefile
90 lines
2.4 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0
|
|
# Objects to go into the VDSO.
|
|
|
|
# Include the generic Makefile to check the built vdso.
|
|
include $(srctree)/lib/vdso/Makefile.include
|
|
|
|
obj-vdso-y := elf.o vgetcpu.o vgetrandom.o \
|
|
vgetrandom-chacha.o sigreturn.o
|
|
obj-vdso-$(CONFIG_GENERIC_GETTIMEOFDAY) += vgettimeofday.o
|
|
|
|
# Common compiler flags between ABIs.
|
|
ccflags-vdso := \
|
|
$(filter -I%,$(KBUILD_CFLAGS)) \
|
|
$(filter -E%,$(KBUILD_CFLAGS)) \
|
|
$(filter -march=%,$(KBUILD_CFLAGS)) \
|
|
$(filter -m%-float,$(KBUILD_CFLAGS)) \
|
|
$(CLANG_FLAGS) \
|
|
-D__VDSO__
|
|
|
|
ifdef CONFIG_32BIT
|
|
ccflags-vdso += -DBUILD_VDSO32
|
|
endif
|
|
|
|
cflags-vdso := $(ccflags-vdso) \
|
|
-isystem $(shell $(CC) -print-file-name=include) \
|
|
$(filter -W%,$(filter-out -Wa$(comma)%,$(KBUILD_CFLAGS))) \
|
|
$(CC_FLAGS_DIALECT) -O2 -g -fno-strict-aliasing -fno-common -fno-builtin \
|
|
-fno-stack-protector -fno-jump-tables -DDISABLE_BRANCH_PROFILING \
|
|
$(call cc-option, -fno-asynchronous-unwind-tables) \
|
|
$(call cc-option, -fno-stack-protector)
|
|
aflags-vdso := $(ccflags-vdso) \
|
|
-D__ASSEMBLY__ -Wa,-gdwarf-2
|
|
|
|
ifneq ($(c-gettimeofday-y),)
|
|
CFLAGS_vgettimeofday.o += -include $(c-gettimeofday-y)
|
|
endif
|
|
|
|
ifneq ($(c-getrandom-y),)
|
|
CFLAGS_vgetrandom.o += -include $(c-getrandom-y)
|
|
endif
|
|
|
|
# VDSO linker flags.
|
|
ldflags-y := -Bsymbolic --no-undefined -soname=linux-vdso.so.1 \
|
|
$(filter -E%,$(KBUILD_CFLAGS)) -shared --build-id -T
|
|
|
|
#
|
|
# Shared build commands.
|
|
#
|
|
|
|
quiet_cmd_vdsold_and_vdso_check = LD $@
|
|
cmd_vdsold_and_vdso_check = $(cmd_ld); $(cmd_vdso_check)
|
|
|
|
quiet_cmd_vdsoas_o_S = AS $@
|
|
cmd_vdsoas_o_S = $(CC) $(a_flags) -c -o $@ $<
|
|
|
|
# Generate VDSO offsets using helper script
|
|
gen-vdsosym := $(src)/gen_vdso_offsets.sh
|
|
quiet_cmd_vdsosym = VDSOSYM $@
|
|
cmd_vdsosym = $(NM) $< | $(gen-vdsosym) | LC_ALL=C sort > $@
|
|
|
|
include/generated/vdso-offsets.h: $(obj)/vdso.so.dbg FORCE
|
|
$(call if_changed,vdsosym)
|
|
|
|
#
|
|
# Build native VDSO.
|
|
#
|
|
|
|
native-abi := $(filter -mabi=%,$(KBUILD_CFLAGS))
|
|
|
|
targets += $(obj-vdso-y)
|
|
targets += vdso.lds vdso.so.dbg vdso.so
|
|
|
|
obj-vdso := $(obj-vdso-y:%.o=$(obj)/%.o)
|
|
|
|
$(obj-vdso): KBUILD_CFLAGS := $(cflags-vdso) $(native-abi)
|
|
$(obj-vdso): KBUILD_AFLAGS := $(aflags-vdso) $(native-abi)
|
|
|
|
$(obj)/vdso.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) $(native-abi)
|
|
|
|
$(obj)/vdso.so.dbg: $(obj)/vdso.lds $(obj-vdso) FORCE
|
|
$(call if_changed,vdsold_and_vdso_check)
|
|
|
|
$(obj)/vdso.so: OBJCOPYFLAGS := -S
|
|
$(obj)/vdso.so: $(obj)/vdso.so.dbg FORCE
|
|
$(call if_changed,objcopy)
|
|
|
|
obj-y += vdso.o
|
|
|
|
$(obj)/vdso.o : $(obj)/vdso.so
|