a2480b4d7e
This reverts commit 0d989ac2c9.
Android kernel isn't ready for this change yet. Here's why:
There are a couple of different methods for linking the Android
kernel presently, hermetically and not. When *not* building
hermetically, the kernel is linked against locally installed
libraries (OpenSSL, LibElf, etc), usually installed by the distro.
Since these are usually fully fledged versions, they're usually
sufficient for any possible combination of build options.
However, when building hermetically (the intended default), the kernel
is linked against libraries contained in the `repo` controlled AOSP
repositories. This is not a problem for the vast majority of the
important builds, but x86 allmodconfig builds require more
functionality than is presently provided.
This revert changes the presence of LibElf to be voluntary again.
Meaning that we do not have to insist on the presence of a locally
installed instance.
Once OpenSSL (currently provided via BoringSSL) is upgraded to a more
featureful offering, we can consider re-inclusion of this patch.
Change-Id: I810139b034e1a6c2db4dc9fa8871279f5edf215d
Signed-off-by: Lee Jones <lee.jones@linaro.org>
101 lines
3.2 KiB
Makefile
101 lines
3.2 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0-only
|
|
# ===========================================================================
|
|
# Module final link
|
|
# ===========================================================================
|
|
|
|
PHONY := __modfinal
|
|
__modfinal:
|
|
|
|
include include/config/auto.conf
|
|
include $(srctree)/scripts/Kbuild.include
|
|
|
|
# for c_flags and objtool_args
|
|
include $(srctree)/scripts/Makefile.lib
|
|
|
|
# find all modules listed in modules.order
|
|
modules := $(sort $(shell cat $(MODORDER)))
|
|
|
|
__modfinal: $(modules)
|
|
@:
|
|
|
|
# modname and part-of-module are set to make c_flags define proper module flags
|
|
modname = $(notdir $(@:.mod.o=))
|
|
part-of-module = y
|
|
|
|
quiet_cmd_cc_o_c = CC [M] $@
|
|
cmd_cc_o_c = $(CC) $(filter-out $(CC_FLAGS_CFI), $(c_flags)) -c -o $@ $<
|
|
|
|
%.mod.o: %.mod.c FORCE
|
|
$(call if_changed_dep,cc_o_c)
|
|
|
|
ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
|
|
|
|
ifdef CONFIG_LTO_CLANG
|
|
# With CONFIG_LTO_CLANG, reuse the object file we compiled for modpost to
|
|
# avoid a second slow LTO link
|
|
prelink-ext := .lto
|
|
|
|
# ELF processing was skipped earlier because we didn't have native code,
|
|
# so let's now process the prelinked binary before we link the module.
|
|
|
|
ifdef CONFIG_STACK_VALIDATION
|
|
ifneq ($(SKIP_STACK_VALIDATION),1)
|
|
cmd_ld_ko_o += \
|
|
$(objtree)/tools/objtool/objtool $(objtool_args) \
|
|
$(@:.ko=$(prelink-ext).o);
|
|
|
|
endif # SKIP_STACK_VALIDATION
|
|
endif # CONFIG_STACK_VALIDATION
|
|
|
|
endif # CONFIG_LTO_CLANG
|
|
|
|
quiet_cmd_ld_ko_o = LD [M] $@
|
|
cmd_ld_ko_o += \
|
|
$(LD) -r $(KBUILD_LDFLAGS) \
|
|
$(KBUILD_LDFLAGS_MODULE) $(LDFLAGS_MODULE) \
|
|
-T scripts/module.lds -o $@ $(filter %.o, $^); \
|
|
$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
|
|
|
|
quiet_cmd_btf_ko = BTF [M] $@
|
|
cmd_btf_ko = \
|
|
if [ -f vmlinux ]; then \
|
|
LLVM_OBJCOPY="$(OBJCOPY)" $(PAHOLE) -J --btf_base vmlinux $@; \
|
|
else \
|
|
printf "Skipping BTF generation for %s due to unavailability of vmlinux\n" $@ 1>&2; \
|
|
fi;
|
|
|
|
# Same as newer-prereqs, but allows to exclude specified extra dependencies
|
|
newer_prereqs_except = $(filter-out $(PHONY) $(1),$?)
|
|
|
|
# Same as if_changed, but allows to exclude specified extra dependencies
|
|
if_changed_except = $(if $(call newer_prereqs_except,$(2))$(cmd-check), \
|
|
$(cmd); \
|
|
printf '%s\n' 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd, @:)
|
|
|
|
|
|
# Re-generate module BTFs if either module's .ko or vmlinux changed
|
|
$(modules): %.ko: %$(prelink-ext).o %.mod.o scripts/module.lds $(if $(KBUILD_BUILTIN),vmlinux) FORCE
|
|
+$(call if_changed_except,ld_ko_o,vmlinux)
|
|
ifdef CONFIG_DEBUG_INFO_BTF_MODULES
|
|
+$(if $(newer-prereqs),$(call cmd,btf_ko))
|
|
endif
|
|
|
|
targets += $(modules) $(modules:.ko=.mod.o)
|
|
|
|
# Add FORCE to the prequisites of a target to force it to be always rebuilt.
|
|
# ---------------------------------------------------------------------------
|
|
|
|
PHONY += FORCE
|
|
FORCE:
|
|
|
|
# Read all saved command lines and dependencies for the $(targets) we
|
|
# may be building above, using $(if_changed{,_dep}). As an
|
|
# optimization, we don't need to read them if the target does not
|
|
# exist, we will rebuild anyway in that case.
|
|
|
|
existing-targets := $(wildcard $(sort $(targets)))
|
|
|
|
-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
|
|
|
|
.PHONY: $(PHONY)
|