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180 lines
4.5 KiB
Makefile
180 lines
4.5 KiB
Makefile
##
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## Rules for building a shared object (.lib.so)
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##
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## The expected variables correspond to those documented in a.mk, with
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## the following addition:
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##
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## SYMBOLS - path of symbols file
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##
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LIB_SO := $(addsuffix .lib.so,$(LIB))
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include $(BASE_DIR)/mk/base-libs.mk
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#
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# Prevent <libname>.mk rules to be executed as default rule
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#
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all:
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@true # prevent nothing-to-be-done message
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#
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# Include common utility functions
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#
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include $(BASE_DIR)/mk/util.inc
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#
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# Include specifics, for example platform, kernel-api etc.
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#
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include $(SPEC_FILES)
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ORIG_INC_DIR := $(INC_DIR)
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#
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# Include library build instructions
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#
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# We set the 'called_from_lib_mk' variable to allow the library description file
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# to respond to the build pass.
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#
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called_from_lib_mk = yes
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include $(LIB_MK)
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#
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# Include lib-import descriptions of all used libraries and the target library
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#
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include $(foreach LIB,$(LIBS),$(call select_from_repositories,lib/import/import-$(LIB).mk))
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#
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# Sanity check for INC_DIR overrides
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#
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ifneq ($(filter-out $(INC_DIR),$(ORIG_INC_DIR)),)
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all: error_inc_dir_override
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endif
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error_inc_dir_override:
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@$(ECHO) "Error: INC_DIR overridden instead of appended" ; false
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#
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# Include global definitions
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#
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include $(BASE_DIR)/mk/global.mk
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include $(BASE_DIR)/mk/generic.mk
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#
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# Link libgcc to shared libraries
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#
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# For static libraries, libgcc is not needed because it will be linked
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# against the final target.
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#
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LIBGCC = $(shell $(CC) $(CC_MARCH) -print-libgcc-file-name)
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#
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# Name of <libname>.lib.a or <libname>.lib.so file to create
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#
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# Skip the creation and installation of an .so file if there are no
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# ingredients. This is the case if the library is present as ABI only.
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#
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ifneq ($(sort $(OBJECTS) $(LIBS)),)
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ABI_SO := $(wildcard $(addsuffix .abi.so,$(LIB)))
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INSTALL_SO := $(INSTALL_DIR)/$(LIB_SO)
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DEBUG_SO := $(DEBUG_DIR)/$(LIB_SO)
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LIB_SO_DEBUG := $(LIB_SO).debug
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DEBUG_SO_DEBUG := $(DEBUG_SO).debug
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endif
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#
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# Whenever an ABI is defined for a shared library, we check the consistency
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# between both by invoking the 'check_abi' tool via the 'LIB_CHECKED'
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# dependency.
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#
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ifneq ($(LIB_SO),)
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ifneq ($(ABI_SO),)
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LIB_CHECKED := $(addsuffix .lib.checked,$(LIB))
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endif
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endif
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#
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# Trigger the creation of the <libname>.lib.so file
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#
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LIB_TAG := $(addsuffix .lib.tag,$(LIB))
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all: $(LIB_TAG)
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$(LIB_TAG):
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@touch $@
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#
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# Trigger the build of host tools
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#
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# We make '$(LIB_TAG)' depend on the host tools to support building host tools
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# from pseudo libraries with no actual source code. In this case '$(OBJECTS)'
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# is empty.
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#
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$(LIB_TAG) $(OBJECTS): $(HOST_TOOLS)
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#
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# Trigger build of additional library specific targets
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#
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$(LIB_TAG): $(CUSTOM_TARGET_DEPS)
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#
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# Don't link shared object it BUILD_ARTIFACTS are declared as empty (ld.lib.so)
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#
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BUILD_ARTIFACTS ?= $(LIB).lib.so
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ifneq ($(BUILD_ARTIFACTS),)
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$(LIB_TAG): $(LIB_SO) $(LIB_CHECKED) $(INSTALL_SO) $(DEBUG_SO) $(DEBUG_SO_DEBUG)
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endif
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#
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# Link ldso-support library to each shared library to provide local hook
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# functions for constructors and ARM
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#
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override ARCHIVES += ldso_so_support.lib.a
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#
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# Don't link base libraries against shared libraries except for ld.lib.so
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#
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ifneq ($(LIB_IS_DYNAMIC_LINKER),yes)
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override ARCHIVES := $(filter-out $(BASE_LIBS:=.lib.a),$(ARCHIVES))
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endif
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#
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# The 'sort' is needed to ensure the same link order regardless
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# of the find order, which uses to vary among different systems.
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#
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STATIC_LIBS := $(sort $(foreach l,$(ARCHIVES:.lib.a=),$(LIB_CACHE_DIR)/$l/$l.lib.a))
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STATIC_LIBS_BRIEF := $(subst $(LIB_CACHE_DIR),$$libs,$(STATIC_LIBS))
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ENTRY_POINT ?= 0x0
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$(LIB_SO): $(SHARED_LIBS)
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$(LIB_SO): $(STATIC_LIBS) $(OBJECTS) $(wildcard $(LD_SCRIPT_SO))
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$(MSG_MERGE)$(LIB_SO)
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$(VERBOSE)libs=$(LIB_CACHE_DIR); $(LD) -o $(LIB_SO) -soname=$(LIB_SO) -shared --eh-frame-hdr \
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$(LD_OPT) -T $(LD_SCRIPT_SO) --entry=$(ENTRY_POINT) \
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--whole-archive --start-group \
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$(SHARED_LIBS) $(STATIC_LIBS_BRIEF) $(OBJECTS) \
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--end-group --no-whole-archive \
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$(LIBGCC)
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$(ABI_SO): $(LD_SCRIPT_SO)
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$(LIB_CHECKED): $(LIB_SO) $(SYMBOLS)
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$(VERBOSE)$(BASE_DIR)/../../tool/check_abi $(LIB_SO) $(SYMBOLS) && touch $@
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$(LIB_SO_DEBUG): $(LIB_SO)
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$(VERBOSE)$(OBJCOPY) --only-keep-debug $< $@
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$(LIB_SO).stripped: $(LIB_SO) $(LIB_SO_DEBUG)
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$(VERBOSE)$(STRIP) -o $@ $<
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$(VERBOSE)$(OBJCOPY) --add-gnu-debuglink=$(LIB_SO_DEBUG) $@
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$(INSTALL_SO): $(LIB_SO).stripped
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$(VERBOSE)ln -sf $(CURDIR)/$< $@
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$(DEBUG_SO): $(LIB_SO).stripped
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$(VERBOSE)ln -sf $(CURDIR)/$< $@
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$(DEBUG_SO_DEBUG): $(LIB_SO_DEBUG)
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$(VERBOSE)ln -sf $(CURDIR)/$< $@
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