mirror of
https://github.com/genodelabs/genode.git
synced 2024-12-30 18:47:01 +00:00
dd1596aa53
Genode linker does not support .gnu.hash tables so they will never be used. Tell the linker not to bother producing them. This should reduce the size of Genode ELF files a tiny bit without loosing anything important in the process. Fixes #4423
273 lines
7.5 KiB
Makefile
273 lines
7.5 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_CPP ?= $(CROSS_DEV_PREFIX)cpp
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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_GNATBIND ?= $(CROSS_DEV_PREFIX)gnatbind
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CUSTOM_HOST_CC ?= $(HOST_DEV_PREFIX)gcc
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CUSTOM_HOST_CXX ?= $(HOST_DEV_PREFIX)g++
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CUSTOM_ADA_CC ?= $(CUSTOM_CC)
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CUSTOM_ALI2DEP ?= $(CROSS_DEV_PREFIX)ali2dep
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CUSTOM_GO ?= $(CROSS_DEV_PREFIX)gccgo
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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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CPP = $(CUSTOM_CPP)
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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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GNATBIND = $(CUSTOM_GNATBIND)
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HOST_CC = $(CUSTOM_HOST_CC)
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ADA_CC = $(CUSTOM_ADA_CC)
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ALI2DEP = $(CUSTOM_ALI2DEP)
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GOLANG = $(CUSTOM_GO)
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#
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# Compiler and Linker options
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#
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#
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# Options for automatically generating dependency files
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#
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# We specify the target for the generated dependency file explicitly via
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# the -MT option. Unfortunately, this option is handled differently by
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# different gcc versions. Older versions used to always append the object
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# file to the target. However, gcc-4.3.2 takes the -MT argument literally.
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# So we have to specify both the .o file and the .d file. On older gcc
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# versions, this results in the .o file to appear twice in the target
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# but that is no problem.
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#
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CC_OPT_DEP = -MMD -MP -MT '$@ $(@:.o=.d)'
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#
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# Always compile with '-ffunction-sections' to enable the use of the
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# linker option '-gc-sections'
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#
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CC_OPT += -ffunction-sections
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#
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# Prevent the compiler from optimizations related to strict aliasing
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#
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CC_OPT += -fno-strict-aliasing
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#
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# Do not compile/link with standard includes and standard libraries per
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# default.
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#
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ifneq ($(STDINC),yes)
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CC_OPT_NOSTDINC := -nostdinc
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endif
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ifneq ($(STDLIB),yes)
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LD_OPT_NOSTDLIB := -nostdlib -Wl,-nostdlib
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endif
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#
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# Add coverage options
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#
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# The directory for the coverage data (generated at runtime) is derived from
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# the current build directory and is going to look like
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#
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# '/genodelabs/bin/test-log_gcov/2018-11-13/gcov_data/test-log_gcov'
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#
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# to match the path where the gcov note files (generated at build time) are
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# stored in the depot package of the test program.
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#
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# If depot packages are not used, the path is going to look like
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#
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# '/gcov_data/test-log_gcov'
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#
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ifeq ($(COVERAGE),yes)
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ifneq ($(findstring /depot/,$(CURDIR)),)
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PROFILE_DIR = $(shell echo $(CURDIR) | \
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sed -e 's/^.*\/depot\//\//' \
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-e 's/\.build\/.*//')/gcov_data/$(TARGET)
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else
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PROFILE_DIR = /gcov_data/$(TARGET)
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endif
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CC_OPT += -fprofile-arcs -ftest-coverage -fprofile-dir=$(PROFILE_DIR)
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endif
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#
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# Enable the undefined behavior sanitizer if requested
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#
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ifeq ($(SANITIZE_UNDEFINED),yes)
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CC_OPT += -fsanitize=undefined
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endif
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#
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# Default optimization and warning levels
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#
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CC_OLEVEL ?= -O2
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CC_WARN ?= -Wall
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#
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# XXX fix the warnings and remove this option
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#
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CC_WARN += -Wno-error=implicit-fallthrough
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#
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# Additional warnings for C++
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#
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CC_CXX_WARN_STRICT_CONVERSION ?= -Wconversion
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CC_CXX_WARN_STRICT ?= -Wextra -Weffc++ -Werror -Wsuggest-override \
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$(CC_CXX_WARN_STRICT_CONVERSION)
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CC_CXX_WARN ?= $(CC_WARN) $(CC_CXX_WARN_STRICT)
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#
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# Additional warnings for Ada/SPARK
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#
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CC_ADA_WARN_STRICT ?= -gnatwe -gnatyyBdSux
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CC_ADA_WARN ?= -gnatwa $(CC_ADA_WARN_STRICT)
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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) $(CC_CXX_WARN)
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CC_C_OPT += $(CC_OPT)
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CC_ADA_OPT += $(CC_ADA_WARN) -fexceptions
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CC_ADA_OPT += $(filter-out -fno-builtin-cos -fno-builtin-sin \
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-fno-builtin-cosf -fno-builtin-sinf ,$(CC_OPT))
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#
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# Enable C++11 by default
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#
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# We substitute '.' characters by '_' to allow a source-file-specific
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# C++ standard option for files with more than one dot in their name.
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#
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CC_CXX_OPT_STD ?= -std=gnu++17
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CC_CXX_OPT += $(lastword $(CC_CXX_OPT_STD) $(CC_CXX_OPT_STD_$(subst .,_,$*)))
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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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# Genode linker does not support .gnu.hash so there is no point in having it
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# in the ELF files. Tell the linker to only produce SysV hash tables.
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#
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LD_OPT += --hash-style=sysv
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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 += $(HOST_INC_DIR)
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VERBOSE ?= @
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VERBOSE_DIR ?= --no-print-directory
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MSG_LINK ?= @$(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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