230 lines
6.3 KiB
Makefile
230 lines
6.3 KiB
Makefile
##
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## Rules for building a program target
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##
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## The following variables must be passed when calling this file:
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##
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## BASE_DIR - base directory of the build system
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## REP_DIR - source repository of the program
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## PRG_REL_DIR - directory of the program relative to 'src/'
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## REPOSITORIES - repositories providing libs and headers
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## INSTALL_DIR - final install location
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## VERBOSE - build verboseness modifier
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## VERBOSE_DIR - verboseness modifier for changing directories
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## VERBOSE_MK - verboseness of make calls
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## LIB_CACHE_DIR - library build cache location
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##
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#
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# Prevent target.mk rules to be executed as default rule
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#
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all:
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#
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# Tell rust to make an object file instead of anything else
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#
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CC_RUSTC_OPT += --emit obj
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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 target build instructions
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#
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PRG_DIR := $(REP_DIR)/src/$(PRG_REL_DIR)
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include $(PRG_DIR)/target.mk
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#
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# Include lib-import description files
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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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# Include specifics for platforms, kernel APIs, etc.
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#
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include $(SPEC_FILES)
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vpath % $(PRG_DIR)
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include $(BASE_DIR)/mk/global.mk
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#
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# Assemble linker options for static and dynamic linkage
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#
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ifneq ($(LD_TEXT_ADDR),)
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CXX_LINK_OPT += -Wl,-Ttext=$(LD_TEXT_ADDR)
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endif
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#
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# Supply machine-dependent arguments to the linker
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#
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CXX_LINK_OPT += $(CC_MARCH)
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#
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# Generic linker script for statically linked binaries
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#
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LD_SCRIPT_STATIC ?= $(call select_from_repositories,src/ld/genode.ld)
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include $(BASE_DIR)/mk/generic.mk
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include $(BASE_DIR)/mk/base-libs.mk
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ifeq ($(INSTALL_DIR),)
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all: message $(TARGET)
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else
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all: message $(INSTALL_DIR)/$(TARGET)
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endif
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@true # prevent nothing-to-be-done message
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.PHONY: message
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message:
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$(MSG_PRG)$(PRG_REL_DIR)/$(TARGET)
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#
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# Enforce unconditional call of gnatmake rule when compiling Ada sources
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#
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# Citation from texinfo manual for make:
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#
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# If a rule has no prerequisites or commands, and the target of the rule
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# is a nonexistent file, then `make' imagines this target to have been
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# updated whenever its rule is run. This implies that all targets
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# depending on this one will always have their commands run.
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#
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FORCE:
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$(SRC_ADA:.adb=.o): FORCE
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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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SHARED_LIBS := $(foreach l,$(DEPS:.lib=),$(LIB_CACHE_DIR)/$l/$l.lib.so)
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SHARED_LIBS := $(sort $(wildcard $(SHARED_LIBS)))
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#
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# Use CXX for linking
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#
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LD_CMD ?= $(CXX)
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LD_CMD += $(CXX_LINK_OPT)
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ifeq ($(SHARED_LIBS),)
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LD_SCRIPTS := $(LD_SCRIPT_STATIC)
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FILTER_DEPS := $(DEPS:.lib=)
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else
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#
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# Add a list of symbols that shall always be added to the dynsym section
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#
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LD_OPT += --dynamic-list=$(call select_from_repositories,src/ld/genode_dyn.dl)
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LD_SCRIPTS := $(LD_SCRIPT_DYN)
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LD_CMD += -Wl,--dynamic-linker=$(DYNAMIC_LINKER).lib.so \
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-Wl,--eh-frame-hdr
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#
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# Filter out the base libraries since they will be provided by the LDSO library
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#
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FILTER_DEPS := $(filter-out $(BASE_LIBS),$(DEPS:.lib=))
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SHARED_LIBS += $(LIB_CACHE_DIR)/$(DYNAMIC_LINKER)/$(DYNAMIC_LINKER).lib.so
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#
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# Build program position independent as well
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#
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CC_OPT_PIC ?= -fPIC
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CC_OPT += $(CC_OPT_PIC)
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endif
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#
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# LD_SCRIPT_PREFIX is needed as 'addprefix' chokes on prefixes containing
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# commas othwerwise. For compatibilty with older tool chains, we use two -Wl
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# parameters for both components of the linker command line.
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#
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LD_SCRIPT_PREFIX = -Wl,-T -Wl,
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#
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# LD_SCRIPTS may be a list of linker scripts (e.g., in base-linux). Further,
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# we use the default linker script if none was specified - 'addprefix' expands
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# to empty string on empty input.
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#
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LD_CMD += $(addprefix $(LD_SCRIPT_PREFIX), $(LD_SCRIPTS))
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STATIC_LIBS := $(foreach l,$(FILTER_DEPS),$(LIB_CACHE_DIR)/$l/$l.lib.a)
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STATIC_LIBS := $(sort $(wildcard $(STATIC_LIBS)))
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#
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# --whole-archive does not work with rlibs
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#
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RUST_LIBS := $(foreach l,$(FILTER_DEPS),$(LIB_CACHE_DIR)/$l/$l.rlib)
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RUST_LIBS := $(sort $(wildcard $(RUST_LIBS)))
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SHORT_RUST_LIBS := $(subst $(LIB_CACHE_DIR),$$libs,$(RUST_LIBS))
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#
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# For hybrid Linux/Genode programs, prevent the linkage Genode's cxx and base
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# library because these functionalities are covered by the glibc or by
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# 'src/platform/lx_hybrid.cc'.
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#
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ifeq ($(USE_HOST_LD_SCRIPT),yes)
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STATIC_LIBS := $(filter-out $(LIB_CACHE_DIR)/startup/startup.lib.a, $(STATIC_LIBS))
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STATIC_LIBS := $(filter-out $(LIB_CACHE_DIR)/base/base.lib.a, $(STATIC_LIBS))
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STATIC_LIBS := $(filter-out $(LIB_CACHE_DIR)/cxx/cxx.lib.a, $(STATIC_LIBS))
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endif
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#
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# We need the linker option '--whole-archive' to make sure that all library
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# constructors marked with '__attribute__((constructor))' end up int the
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# binary. When not using this option, the linker goes through all libraries
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# to resolve a symbol and, if it finds the symbol, stops searching. This way,
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# object files that are never explicitly referenced (such as library
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# constructors) would not be visited at all.
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#
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# Furthermore, the '--whole-archive' option reveals symbol ambiguities, which
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# would go undetected if the search stops after the first match.
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#
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LINK_ITEMS := $(OBJECTS) $(STATIC_LIBS) $(SHARED_LIBS)
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SHORT_LINK_ITEMS := $(subst $(LIB_CACHE_DIR),$$libs,$(LINK_ITEMS))
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#
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# Trigger the build of host tools
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#
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$(LINK_ITEMS) $(TARGET): $(HOST_TOOLS)
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LD_CMD += -Wl,--whole-archive -Wl,--start-group
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LD_CMD += $(SHORT_LINK_ITEMS)
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LD_CMD += $(EXT_OBJECTS)
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LD_CMD += -Wl,--no-whole-archive
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LD_CMD += $(SHORT_RUST_LIBS)
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LD_CMD += -Wl,--end-group
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#
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# Link libgcc to each program
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#
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LD_LIBGCC ?= $(shell $(CC) $(CC_MARCH) -print-libgcc-file-name)
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LD_CMD += $(LD_LIBGCC)
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#
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# Skip final linking if no objects are involved, i.e. no 'SRC' files are
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# specified in the 'target.mk' file. This applies for pseudo 'target.mk'
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# files that invoke a 3rd-party build system by providing local rule for
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# $(TARGET).
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#
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ifneq ($(OBJECTS),)
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$(TARGET): $(LINK_ITEMS) $(wildcard $(LD_SCRIPTS))
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$(MSG_LINK)$(TARGET)
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$(VERBOSE)libs=$(LIB_CACHE_DIR); $(LD_CMD) -o $@
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$(INSTALL_DIR)/$(TARGET): $(TARGET)
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$(VERBOSE)ln -sf $(CURDIR)/$(TARGET) $@
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else
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$(TARGET):
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$(INSTALL_DIR)/$(TARGET): $(TARGET)
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endif
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clean_prg_objects:
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$(MSG_CLEAN)$(PRG_REL_DIR)
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$(VERBOSE)$(RM) -f $(OBJECTS) $(OBJECTS:.o=.d) $(TARGET)
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$(VERBOSE)$(RM) -f *.d *.i *.ii *.s *.ali
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clean: clean_prg_objects
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