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https://github.com/genodelabs/genode.git
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11c31c4432
We set 'ld -z max-page-size' to 4KiB to prevent the linker from aligning the text segment to any built-in default (e.g., 4MiB on x86_64 or 64KiB on ARM). Otherwise, the padding bytes are wasted at the beginning of the final binary.
193 lines
5.1 KiB
Makefile
193 lines
5.1 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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# 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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# 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 = $(call select_from_repositories,src/platform/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 ?= $(call select_from_repositories,src/platform/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_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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