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.
208 lines
5.4 KiB
Makefile
208 lines
5.4 KiB
Makefile
#
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# Global build configuration variables
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#
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#
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# Read user-provided tools configuration
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#
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-include $(call select_from_repositories,etc/tools.conf)
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-include $(BUILD_BASE_DIR)/etc/tools.conf
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#
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# Set undefined CUSTOM_ tools to their default values
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#
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CUSTOM_CC ?= $(CROSS_DEV_PREFIX)gcc
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CUSTOM_CXX ?= $(CROSS_DEV_PREFIX)g++
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CUSTOM_CXX_LIB ?= $(CUSTOM_CXX)
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CUSTOM_LD ?= $(CROSS_DEV_PREFIX)ld
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CUSTOM_AS ?= $(CROSS_DEV_PREFIX)as
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CUSTOM_AR ?= $(CROSS_DEV_PREFIX)ar
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CUSTOM_NM ?= $(CROSS_DEV_PREFIX)nm
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CUSTOM_OBJCOPY ?= $(CROSS_DEV_PREFIX)objcopy
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CUSTOM_RANLIB ?= $(CROSS_DEV_PREFIX)ranlib
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CUSTOM_STRIP ?= $(CROSS_DEV_PREFIX)strip
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CUSTOM_HOST_CC ?= gcc
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#
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# GNU utilities
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#
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# Non-Linux operating systems may have to install 'findutils'
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# to get the GNU versions of xargs and find.
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#
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TAC ?= tac
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GNU_FIND ?= find
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GNU_XARGS ?= xargs
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ECHO ?= echo -e
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#
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# Build tools
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#
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CC = $(CUSTOM_CC)
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CXX = $(CUSTOM_CXX)
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LD = $(CUSTOM_LD)
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AS = $(CUSTOM_AS)
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AR = $(CUSTOM_AR)
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NM = $(CUSTOM_NM)
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OBJCOPY = $(CUSTOM_OBJCOPY)
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RANLIB = $(CUSTOM_RANLIB)
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STRIP = $(CUSTOM_STRIP)
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HOST_CC = $(CUSTOM_HOST_CC)
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#
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# Compiler and Linker options
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#
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#
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# Options for automatically generating dependency files
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#
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# We specify the target for the generated dependency file explicitly via
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# the -MT option. Unfortunately, this option is handled differently by
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# different gcc versions. Older versions used to always append the object
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# file to the target. However, gcc-4.3.2 takes the -MT argument literally.
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# So we have to specify both the .o file and the .d file. On older gcc
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# versions, this results in the .o file to appear twice in the target
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# but that is no problem.
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#
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CC_OPT_DEP = -MMD -MP -MT '$@ $(@:.o=.d)'
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#
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# Always compile with '-ffunction-sections' to enable the use of the
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# linker option '-gc-sections'
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#
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CC_OPT += -ffunction-sections
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#
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# Prevent the compiler from optimizations related to strict aliasing
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#
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CC_OPT += -fno-strict-aliasing
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#
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# Do not compile/link with standard includes and standard libraries per
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# default.
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#
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ifneq ($(STDINC),yes)
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CC_OPT_NOSTDINC := -nostdinc
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endif
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ifneq ($(STDLIB),yes)
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LD_OPT_NOSTDLIB := -nostdlib -Wl,-nostdlib
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endif
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#
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# Default optimization and warning levels
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#
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CC_OLEVEL ?= -O2
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CC_WARN ?= -Wall
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#
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# Aggregate compiler options that are common for C and C++
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#
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CC_OPT += $(CC_OPT_NOSTDINC) -g $(CC_MARCH) $(CC_OLEVEL) $(CC_OPT_DEP) $(CC_WARN)
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#
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# Incorporate source-file-specific compiler options
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#
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# The make variable $* refers to the currently processed compilation
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# unit when 'CC_OPT' gets implicitly expanded by the rules '%.o: %.c'
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# and '%.o: %.cc' of 'generic.mk'.
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#
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# We substitute '.' characters by '_' to allow source-file-specific
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# compiler options for files with more than one dot in their name.
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#
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CC_OPT += $(CC_OPT_$(subst .,_,$*))
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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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#
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# Predefine C and C++ specific compiler options with their common values
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#
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CC_CXX_OPT += $(CC_OPT)
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CC_C_OPT += $(CC_OPT)
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CC_ADA_OPT += $(CC_OLEVEL) $(CC_WARN)
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#
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# Rust-specific arguments
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#
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# Use the correct linker, include dependencies.
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#
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CC_RUSTC_OPT += -C linker=$(LD)
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CC_RUSTC_OPT += $(foreach lib,$(LIBS),-L$(LIB_CACHE_DIR)/$(lib))
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#
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# Enable C++11 by default
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#
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CC_CXX_OPT_STD ?= -std=gnu++11
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CC_CXX_OPT += $(CC_CXX_OPT_STD)
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#
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# Linker options
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#
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# Use '-gc-sections' by default but allow a platform to disable this feature by
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# defining 'LD_GC_SECTIONS' empty. This is needed for older tool chains (gcc
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# version 4.11 and binutils version 2.16), which happen to produce broken
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# code when '-gc-sections' is enabled. Also, set max-page-size to 4KiB to
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# prevent the linker from aligning the text segment to any built-in default
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# (e.g., 4MiB on x86_64 or 64KiB on ARM). Otherwise, the padding bytes are
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# wasted at the beginning of the final binary.
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#
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LD_OPT_GC_SECTIONS ?= -gc-sections
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LD_OPT_ALIGN_SANE = -z max-page-size=0x1000
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LD_OPT_PREFIX := -Wl,
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LD_OPT += $(LD_MARCH) $(LD_OPT_GC_SECTIONS) $(LD_OPT_ALIGN_SANE)
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CXX_LINK_OPT += $(addprefix $(LD_OPT_PREFIX),$(LD_OPT))
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CXX_LINK_OPT += $(LD_OPT_NOSTDLIB)
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#
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# Linker script for dynamically linked programs
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#
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LD_SCRIPT_DYN = $(BASE_DIR)/src/ld/genode_dyn.ld
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#
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# Linker script for shared libraries
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#
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LD_SCRIPT_SO ?= $(BASE_DIR)/src/ld/genode_rel.ld
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#
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# Assembler options
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#
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AS_OPT += $(AS_MARCH)
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#
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# Control sequences for color terminals
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#
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# To disable colored output, define these variable empty in your
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# build-local 'etc/tools.conf' file.
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#
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BRIGHT_COL ?= \033[01;33m
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DARK_COL ?= \033[00;33m
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DEFAULT_COL ?= \033[0m
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ALL_INC_DIR := .
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ALL_INC_DIR += $(INC_DIR)
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ALL_INC_DIR += $(foreach DIR,$(REP_INC_DIR), $(foreach REP,$(REPOSITORIES),$(REP)/$(DIR)))
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ALL_INC_DIR += $(foreach REP,$(REPOSITORIES),$(REP)/include)
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ALL_INC_DIR += $(LIBGCC_INC_DIR)
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ALL_INC_DIR += $(HOST_INC_DIR)
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INSTALL_DIR ?=
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VERBOSE ?= @
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VERBOSE_DIR ?= --no-print-directory
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MSG_LINK = @$(ECHO) " LINK "
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MSG_COMP = @$(ECHO) " COMPILE "
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MSG_BUILD = @$(ECHO) " BUILD "
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MSG_RENAME = @$(ECHO) " RENAME "
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MSG_MERGE = @$(ECHO) " MERGE "
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MSG_CONVERT = @$(ECHO) " CONVERT "
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MSG_CONFIG = @$(ECHO) " CONFIG "
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MSG_CLEAN = @$(ECHO) " CLEAN "
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MSG_ASSEM = @$(ECHO) " ASSEMBLE "
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MSG_INST = @$(ECHO) " INSTALL "
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MSG_PRG = @$(ECHO) "$(BRIGHT_COL) Program $(DEFAULT_COL)"
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MSG_LIB = @$(ECHO) "$(DARK_COL) Library $(DEFAULT_COL)"
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