188 lines
5.1 KiB
Makefile
188 lines
5.1 KiB
Makefile
##
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## Rules for building a library 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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## REPOSITORIES - repositories providing libs and headers
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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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## BUILD_BASE_DIR - base of build directory tree
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## LIB_CACHE_DIR - library build cache location
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## INSTALL_DIR - program target build directory
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## DEPS - library dependencies
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## REP_DIR - repository where the library resides
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##
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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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#
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# Function that searches for files in all
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# repositories and returns the first match.
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#
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select_from_repositories = $(firstword $(foreach REP,$(REPOSITORIES),$(wildcard $(REP)/$(1))))
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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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#
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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 decription file
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# to respond to the build pass.
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#
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BACKUP_INC_DIR := $(INC_DIR)
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called_from_lib_mk = yes
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include $(LIB_MK)
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#
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# Sanity check for INC_DIR overrides
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#
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ifneq ($(filter-out $(INC_DIR),$(BACKUP_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: $(LIB_MK) overrides INC_DIR instead of appending" ; false
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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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# Include global definitions
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#
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include $(BASE_DIR)/mk/global.mk
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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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ifndef SHARED_LIB
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LIB_A := $(addsuffix .lib.a,$(LIB))
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LIB_FILENAME := $(LIB_A)
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else
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LIB_SO := $(addsuffix .lib.so,$(LIB))
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INSTALL_SO := $(INSTALL_DIR)/$(LIB_SO)
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LIB_FILENAME := $(LIB_SO)
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endif
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LIB_TAG := $(addsuffix .lib.tag,$(LIB))
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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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ifdef SHARED_LIB
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LIBGCC = $(shell $(CC) $(CC_MARCH) -print-libgcc-file-name)
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endif
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#
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# Build libraries position-independent
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#
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# This option is required for building shared objects but also for static
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# libraries that are (potentially) linked against shared objects. Hence,
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# we build all libraries with '-fPIC'.
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#
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CC_OPT_PIC ?= -fPIC
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CC_OPT += $(CC_OPT_PIC)
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#
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# Print message for the currently built library
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#
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all: message
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message:
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$(MSG_LIB)$(LIB)
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#
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# Trigger the creation of the <libname>.lib.a or <libname>.lib.so file
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#
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all: $(LIB_TAG)
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$(LIB_TAG): $(LIB_A) $(LIB_SO) $(INSTALL_SO)
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@touch $@
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include $(BASE_DIR)/mk/generic.mk
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#
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# Rule to build the <libname>.lib.a file
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#
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# Use $(OBJECTS) instead of $^ for specifying the list of objects to include
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# in the archive because $^ may also contain non-object phony targets, e.g.,
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# used by the integration of Qt4's meta-object compiler into the Genode
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# build system.
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#
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$(LIB_A): $(OBJECTS)
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$(MSG_MERGE)$(LIB_A)
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$(VERBOSE)$(AR) -rc $@ $(OBJECTS)
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#
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# Prevent linkage of startup code against shared libraries except for ld.lib.so
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#
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ifdef SHARED_LIB
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ifneq ($(LIB),ld)
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override DEPS := $(filter-out startup.lib,$(DEPS))
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endif
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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 := $(foreach l,$(DEPS:.lib=),$(LIB_CACHE_DIR)/$l/$l.lib.a)
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STATIC_LIBS := $(sort $(wildcard $(STATIC_LIBS)))
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STATIC_LIBS_BRIEF := $(subst $(LIB_CACHE_DIR),$$libs,$(STATIC_LIBS))
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#
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# Rule to build the <libname>.lib.so file
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#
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# The 'LIBS' variable may contain static and shared sub libraries. When linking
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# the shared library, we have to link all shared sub libraries to the library
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# to store the library-dependency information in the library. Because we do not
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# know which sub libraries are static or shared prior calling 'build_libs.mk',
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# we use an explicit call to the 'lib_so_wildcard' macro to determine the subset
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# of libraries that are shared.
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#
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# The 'ldso-startup/startup.o' object file, which contains the support code for
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# constructing static objects must be specified as object file to prevent the
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# linker from garbage-collecting it.
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#
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USED_SHARED_LIBS := $(filter $(DEPS:.lib=),$(SHARED_LIBS))
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USED_SO_FILES := $(foreach s,$(USED_SHARED_LIBS),$(LIB_CACHE_DIR)/$s/$s.lib.so)
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#
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# Don't link ld libary against shared objects
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#
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USED_SO_FILES := $(filter-out %ld.lib.so,$(USED_SO_FILES))
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#
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# Default entry point of shared libraries
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#
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ENTRY_POINT ?= 0x0
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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 $(LIB_SO) -shared --eh-frame-hdr \
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$(LD_OPT) \
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-T $(LD_SCRIPT_SO) \
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--entry=$(ENTRY_POINT) \
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--whole-archive \
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--start-group \
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$(USED_SO_FILES) $(STATIC_LIBS_BRIEF) $(OBJECTS) \
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--end-group \
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--no-whole-archive \
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$(LIBGCC)
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$(INSTALL_SO):
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$(VERBOSE)ln -sf $(CURDIR)/$(LIB_SO) $@
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