mirror of
https://github.com/genodelabs/genode.git
synced 2025-01-05 05:24:13 +00:00
b8beba5bf3
Make 'set_program_var' accessible outside of 'rtld.c'. Also, compile dynamically linked programs with the '-fPIC' option. Doing not so, yields to program-global symbols being put in the '.symtab' section (which can be stripped) only. In order to get access to global variables from the dynamic linker, the symbols need to reside within the '.dynsym' section additionally. Hence the '-fPIC'. ref #989 fix #1002
213 lines
6.0 KiB
Makefile
213 lines
6.0 KiB
Makefile
##
|
|
## Rules for building a program target
|
|
##
|
|
## The following variables must be passed when calling this file:
|
|
##
|
|
## BASE_DIR - base directory of the build system
|
|
## REP_DIR - source repository of the program
|
|
## PRG_REL_DIR - directory of the program relative to 'src/'
|
|
## REPOSITORIES - repositories providing libs and headers
|
|
## INSTALL_DIR - final install location
|
|
## VERBOSE - build verboseness modifier
|
|
## VERBOSE_DIR - verboseness modifier for changing directories
|
|
## VERBOSE_MK - verboseness of make calls
|
|
## LIB_CACHE_DIR - library build cache location
|
|
##
|
|
|
|
#
|
|
# Prevent target.mk rules to be executed as default rule
|
|
#
|
|
all:
|
|
|
|
#
|
|
# Function that searches for files in all repositories and returns the first match
|
|
#
|
|
select_from_repositories = $(firstword $(foreach REP,$(REPOSITORIES),$(wildcard $(REP)/$(1))))
|
|
|
|
#
|
|
# Include target build instructions
|
|
#
|
|
PRG_DIR := $(REP_DIR)/src/$(PRG_REL_DIR)
|
|
include $(PRG_DIR)/target.mk
|
|
|
|
#
|
|
# Enforce use of 'lx_hybrid' library for all targets when 'always_hybrid' is
|
|
# enabled
|
|
#
|
|
ifeq ($(filter-out $(SPECS),always_hybrid),)
|
|
LIBS += lx_hybrid
|
|
endif
|
|
|
|
#
|
|
# Include lib-import description files
|
|
#
|
|
include $(foreach LIB,$(LIBS),$(call select_from_repositories,lib/import/import-$(LIB).mk))
|
|
|
|
#
|
|
# Include specifics for platforms, kernel APIs, etc.
|
|
#
|
|
include $(SPEC_FILES)
|
|
|
|
vpath % $(PRG_DIR)
|
|
|
|
include $(BASE_DIR)/mk/global.mk
|
|
|
|
#
|
|
# Assemble linker options for static and dynamic linkage
|
|
#
|
|
ifneq ($(LD_TEXT_ADDR),)
|
|
CXX_LINK_OPT += -Wl,-Ttext=$(LD_TEXT_ADDR)
|
|
endif
|
|
|
|
#
|
|
# Supply machine-dependent arguments to the linker
|
|
#
|
|
CXX_LINK_OPT += $(CC_MARCH)
|
|
|
|
|
|
#
|
|
# Generic linker script for statically linked binaries
|
|
#
|
|
LD_SCRIPT_STATIC ?= $(call select_from_repositories,src/platform/genode.ld)
|
|
|
|
include $(BASE_DIR)/mk/generic.mk
|
|
include $(BASE_DIR)/mk/base-libs.mk
|
|
|
|
ifeq ($(INSTALL_DIR),)
|
|
all: message $(TARGET)
|
|
else
|
|
all: message $(INSTALL_DIR)/$(TARGET)
|
|
endif
|
|
@true # prevent nothing-to-be-done message
|
|
|
|
.PHONY: message
|
|
message:
|
|
$(MSG_PRG)$(PRG_REL_DIR)/$(TARGET)
|
|
|
|
#
|
|
# Enforce unconditional call of gnatmake rule when compiling Ada sources
|
|
#
|
|
# Citation from texinfo manual for make:
|
|
#
|
|
# If a rule has no prerequisites or commands, and the target of the rule
|
|
# is a nonexistent file, then `make' imagines this target to have been
|
|
# updated whenever its rule is run. This implies that all targets
|
|
# depending on this one will always have their commands run.
|
|
#
|
|
FORCE:
|
|
$(SRC_ADA:.adb=.o): FORCE
|
|
|
|
#
|
|
# The 'sort' is needed to ensure the same link order regardless
|
|
# of the find order, which uses to vary among different systems.
|
|
#
|
|
SHARED_LIBS := $(foreach l,$(DEPS:.lib=),$(LIB_CACHE_DIR)/$l/$l.lib.so)
|
|
SHARED_LIBS := $(sort $(wildcard $(SHARED_LIBS)))
|
|
|
|
#
|
|
# Use CXX for linking
|
|
#
|
|
LD_CMD ?= $(CXX)
|
|
|
|
LD_CMD += $(CXX_LINK_OPT)
|
|
|
|
ifeq ($(SHARED_LIBS),)
|
|
LD_SCRIPTS := $(LD_SCRIPT_STATIC)
|
|
FILTER_DEPS := $(DEPS:.lib=)
|
|
else
|
|
LD_SCRIPTS := $(LD_SCRIPT_DYN)
|
|
LD_CMD += -Wl,--dynamic-linker=$(DYNAMIC_LINKER).lib.so \
|
|
-Wl,--eh-frame-hdr
|
|
|
|
#
|
|
# Filter out the base libraries since they will be provided by the ldso.library
|
|
#
|
|
FILTER_DEPS := $(filter-out $(BASE_LIBS),$(DEPS:.lib=))
|
|
SHARED_LIBS += $(LIB_CACHE_DIR)/$(DYNAMIC_LINKER)/$(DYNAMIC_LINKER).lib.so
|
|
|
|
#
|
|
# Build program position independent as well
|
|
#
|
|
CC_OPT_PIC ?= -fPIC
|
|
CC_OPT += $(CC_OPT_PIC)
|
|
|
|
endif
|
|
|
|
#
|
|
# LD_SCRIPT_PREFIX is needed as 'addprefix' chokes on prefixes containing
|
|
# commas othwerwise. For compatibilty with older tool chains, we use two -Wl
|
|
# parameters for both components of the linker command line.
|
|
#
|
|
LD_SCRIPT_PREFIX = -Wl,-T -Wl,
|
|
|
|
#
|
|
# LD_SCRIPTS may be a list of linker scripts (e.g., in base-linux). Further,
|
|
# we use the default linker script if none was specified - 'addprefix' expands
|
|
# to empty string on empty input.
|
|
#
|
|
LD_CMD += $(addprefix $(LD_SCRIPT_PREFIX), $(LD_SCRIPTS))
|
|
|
|
STATIC_LIBS := $(foreach l,$(FILTER_DEPS),$(LIB_CACHE_DIR)/$l/$l.lib.a)
|
|
STATIC_LIBS := $(sort $(wildcard $(STATIC_LIBS)))
|
|
|
|
#
|
|
# For hybrid Linux/Genode programs, prevent the linkage Genode's cxx, base,
|
|
# and startup libraries because these functionalities are covered by the glibc
|
|
# or by 'src/platform/lx_hybrid.cc'.
|
|
#
|
|
ifeq ($(USE_HOST_LD_SCRIPT),yes)
|
|
STATIC_LIBS := $(filter-out $(LIB_CACHE_DIR)/startup/startup.lib.a, $(STATIC_LIBS))
|
|
STATIC_LIBS := $(filter-out $(LIB_CACHE_DIR)/base/base.lib.a, $(STATIC_LIBS))
|
|
STATIC_LIBS := $(filter-out $(LIB_CACHE_DIR)/cxx/cxx.lib.a, $(STATIC_LIBS))
|
|
endif
|
|
|
|
#
|
|
# We need the linker option '--whole-archive' to make sure that all library
|
|
# constructors marked with '__attribute__((constructor))' end up int the
|
|
# binary. When not using this option, the linker goes through all libraries
|
|
# to resolve a symbol and, if it finds the symbol, stops searching. This way,
|
|
# object files that are never explicitly referenced (such as library
|
|
# constructors) would not be visited at all.
|
|
#
|
|
# Furthermore, the '--whole-archive' option reveals symbol ambiguities, which
|
|
# would go undetected if the search stops after the first match.
|
|
#
|
|
LINK_ITEMS := $(OBJECTS) $(STATIC_LIBS) $(SHARED_LIBS)
|
|
SHORT_LINK_ITEMS := $(subst $(LIB_CACHE_DIR),$$libs,$(LINK_ITEMS))
|
|
|
|
LD_CMD += -Wl,--whole-archive -Wl,--start-group
|
|
LD_CMD += $(SHORT_LINK_ITEMS)
|
|
LD_CMD += $(EXT_OBJECTS)
|
|
LD_CMD += -Wl,--end-group -Wl,--no-whole-archive
|
|
|
|
#
|
|
# Link libgcc to each program
|
|
#
|
|
LD_LIBGCC ?= $(shell $(CC) $(CC_MARCH) -print-libgcc-file-name)
|
|
LD_CMD += $(LD_LIBGCC)
|
|
|
|
#
|
|
# Skip final linking if no objects are involved, i.e. no 'SRC' files are
|
|
# specified in the 'target.mk' file. This applies for pseudo 'target.mk'
|
|
# files that invoke a 3rd-party build system by providing local rule for
|
|
# $(TARGET).
|
|
#
|
|
ifneq ($(OBJECTS),)
|
|
$(TARGET): $(LINK_ITEMS) $(wildcard $(LD_SCRIPTS))
|
|
$(MSG_LINK)$(TARGET)
|
|
$(VERBOSE)libs=$(LIB_CACHE_DIR); $(LD_CMD) -o $@
|
|
|
|
$(INSTALL_DIR)/$(TARGET): $(TARGET)
|
|
$(VERBOSE)ln -sf $(CURDIR)/$(TARGET) $@
|
|
else
|
|
$(TARGET):
|
|
$(INSTALL_DIR)/$(TARGET): $(TARGET)
|
|
endif
|
|
|
|
clean_prg_objects:
|
|
$(MSG_CLEAN)$(PRG_REL_DIR)
|
|
$(VERBOSE)$(RM) -f $(OBJECTS) $(OBJECTS:.o=.d) $(TARGET)
|
|
$(VERBOSE)$(RM) -f *.d *.i *.ii *.s *.ali
|
|
|
|
clean: clean_prg_objects
|