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3d7b92ea50
This patch make the ABI mechanism available to shared libraries other than Genode's dynamic linker. It thereby allows us to introduce intermediate ABIs at the granularity of shared libraries. This is useful for slow-moving ABIs such as the libc's interface but it will also become handy for the package management. To implement the feature, the build system had to be streamlined a bit. In particular, archive dependencies and shared-lib dependencies are now handled separately, and the global list of 'SHARED_LIBS' is no more. Now, the variable with the same name holds the per-target list of shared libraries used by the target.
245 lines
7.2 KiB
Makefile
245 lines
7.2 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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## SHARED_LIBS - shared-library dependencies of the library
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## ARCHIVES - archive dependencies of the library
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## REP_DIR - repository where the library resides
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## CONTRIB_DIR - location of ported 3rd-party source codes
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##
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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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#
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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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#
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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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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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ifdef SHARED_LIB
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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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else
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LIB_A := $(addsuffix .lib.a,$(LIB))
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LIB_FILENAME := $(LIB_A)
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endif
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LIB_TAG := $(addsuffix .lib.tag,$(LIB))
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#
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# If a symbol list is provided, we create an ABI stub named '<lib>.abi.so'
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#
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# The ABI-stub library does not contain any code or data but only the symbol
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# information of the binary interface (ABI) of the shared library.
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#
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# The ABI stub is linked by the users of the library (executables or shared
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# objects) instead of the real library. This effectively decouples the library
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# users from the concrete library instance but binds them merely to the
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# library's binary interface. Note that the ABI stub is not used at runtime at
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# all. At runtime, the real library that implements the ABI is loaded by the
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# dynamic linker.
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#
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# The symbol information are incorporated into the ABI stub via an assembly
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# file named '<lib>.symbols.s' that is generated from the library's symbol
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# list. We create a symbolic link from the symbol file to the local directory.
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# By using '.symbols' as file extension, the pattern rule '%.symbols.s:
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# %.symbols' defined in 'generic.mk' is automatically applied for creating the
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# assembly file from the symbols file.
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#
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# The '.PRECIOUS' special target prevents make to remove the intermediate
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# assembler file. Otherwise make would spill the build log with messages
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# like "rm libc.symbols.s".
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#
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ifneq ($(SYMBOLS),)
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ABI_SO := $(addsuffix .abi.so,$(LIB))
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$(LIB).symbols:
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$(VERBOSE)ln -sf $(SYMBOLS) $@
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.PRECIOUS: $(LIB).symbols.s
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endif
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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) $(CC_MARCH) -print-libgcc-file-name)
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endif
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#
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# Print message for the currently built library
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#
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all: message
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message:
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$(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: $(LIB_TAG)
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#
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# Trigger the build of host tools
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#
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# We make '$(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): $(HOST_TOOLS)
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$(LIB_TAG): $(LIB_A) $(LIB_SO) $(ABI_SO) $(INSTALL_SO)
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@touch $@
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include $(BASE_DIR)/mk/generic.mk
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#
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# Rust support
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#
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# For a rust library, we create both an actual library (lib.a or lib.so) that
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# is used for linking the final binary, and an rlib file that is required for
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# compiling rust source codes that use the library. As the rlib is created from
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# the file specified at 'SRC_RS' via the pattern rule '%.rlib: %.rs', its name
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# corresponds to the source file, not the library name. To enable rustc to find
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# the library when compiling dependent compilation units, we create an
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# appropriately named symlink that points to the rlib file.
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#
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ifneq ($(SRC_RS),)
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ifneq ($(words $(SRC_RS)),1)
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$(error 'SRC_RC' of library $(LIB) has more than one element: $(SRC_RC))
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endif
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$(LIB_A): $(LIB).rlib
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endif
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.PRECIOUS: $(SRC_RC:.rs=.rlib)
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$(LIB).rlib: $(SRC_RS:.rs=.rlib)
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$(VERBOSE)ln -s $< $@
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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 $^ may also contain non-object phony targets, e.g.,
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# used by the integration of Qt's meta-object compiler into the Genode
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# build system.
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#
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$(LIB_A): $(OBJECTS)
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$(MSG_MERGE)$(LIB_A)
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$(VERBOSE)$(RM) -f $@
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$(VERBOSE)$(AR) -rcs $@ $(OBJECTS)
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#
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# Link ldso-startup library to each shared library
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#
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ifdef SHARED_LIB
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override ARCHIVES += ldso-startup.lib.a
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endif
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#
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# Don't link base libraries against shared libraries except for ld.lib.so
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#
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ifneq ($(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,$(STATIC_LIBS))
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#
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# Rule to build the <libname>.lib.so file
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#
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# When linking the shared library, we have to link all shared sub libraries
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# (LIB_SO_DEPS) to the library to store the library-dependency information in
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# the generated shared object.
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#
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# The 'ldso-startup/startup.o' object file, which contains the support code for
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# constructing static objects must be specified as object file to prevent the
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# linker from garbage-collecting it.
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#
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#
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# Default entry point of shared libraries
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#
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ENTRY_POINT ?= 0x0
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$(LIB_SO) $(ABI_SO): $(SHARED_LIBS)
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$(LIB_SO): $(STATIC_LIBS) $(OBJECTS) $(wildcard $(LD_SCRIPT_SO)) $(LIB_SO_DEPS)
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$(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) -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): $(LIB).symbols.o
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$(MSG_MERGE)$(ABI_SO)
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$(VERBOSE)$(LD) -o $(ABI_SO) -shared --eh-frame-hdr $(LD_OPT) \
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-T $(LD_SCRIPT_SO) \
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--whole-archive --start-group \
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$(LIB_SO_DEPS) $< \
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--end-group --no-whole-archive
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$(INSTALL_SO):
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$(VERBOSE)ln -sf $(CURDIR)/$(LIB_SO) $@
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