# Rules.make for uClibc # # Copyright (C) 2000-2008 Erik Andersen # # Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball. # # make nano-doc # FOO = bar -- recursively expanded variable. Value is remebered verbatim. # If it contains references to other variables, these references # are expanded whenever this variable is _substituted_. # FOO := bar -- simply expanded variable. Right hand is expanded when # the variable is _defined_. Therefore faster than =. # FOO ?= bar -- set a value only if it is not already set # (behaves as =, not :=). # FOO += bar -- append; if FOO is not defined, acts like = (not :=). # check for proper make version ifneq ($(findstring x3.7,x$(MAKE_VERSION)),) $(error Your make is too old $(MAKE_VERSION). Go get at least 3.80) endif #----------------------------------------------------------- # This file contains rules which are shared between multiple # Makefiles. All normal configuration options live in the # file named ".config". Don't mess with this file unless # you know what you are doing. clean_targets := clean realclean distclean \ objclean-y headers_clean-y CLEAN_utils noconfig_targets := menuconfig config nconfig \ oldaskconfig silentoldconfig oldconfig allnoconfig allyesconfig \ alldefconfig randconfig defconfig savedefconfig listnewconfig \ olddefconfig \ xconfig gconfig update-po-config mconf qconf gconf nconf conf \ release dist tags help #----------------------------------------------------------- # If you are running a cross compiler, you will want to set # 'CROSS_COMPILE' to something more interesting ... Target # architecture is determined by asking the CC compiler what # arch it compiles things for, so unless your compiler is # broken, you should not need to specify TARGET_ARCH. # # Most people will set this stuff on the command line, i.e. # make CROSS_COMPILE=arm-linux- # will build uClibc for 'arm'. # CROSS is still supported for backward compatibily only CROSS_COMPILE ?= $(CROSS) CC = $(CROSS_COMPILE)gcc AR = $(CROSS_COMPILE)ar LD = $(CROSS_COMPILE)ld NM = $(CROSS_COMPILE)nm OBJDUMP = $(CROSS_COMPILE)objdump STRIPTOOL = $(CROSS_COMPILE)strip INSTALL = install LN = ln RM = rm -f TAR = tar SED = sed AWK = awk STRIP_FLAGS ?= -x -R .note -R .comment # Select the compiler needed to build binaries for your development system HOSTCC = gcc BUILD_CFLAGS = -Os #--------------------------------------------------------- # Nothing beyond this point should ever be touched by mere # mortals. Unless you hang out with the gods, you should # probably leave all this stuff alone. # strip quotes qstrip = $(strip $(subst ",,$(1))) #")) # kconfig stuff KCONFIG_CONFIG ?= $(top_builddir).config KCONFIG_CONFIG := $(abspath $(KCONFIG_CONFIG)) export KCONFIG_CONFIG KCONFIG_AUTOCONFIG := $(dir $(KCONFIG_CONFIG))include/config/auto.conf export KCONFIG_AUTOCONFIG KCONFIG_TRISTATE := $(dir $(KCONFIG_CONFIG))include/config/tristate.conf export KCONFIG_TRISTATE srctree := $(abspath $(top_srcdir)) export srctree KCONFIG_AUTOHEADER := $(dir $(KCONFIG_CONFIG))include/generated/autoconf.h export KCONFIG_AUTOHEADER Kconfig := $(abspath $(top_srcdir)extra/Configs/Config.in) # Pull in the user's uClibc configuration ifeq ($(filter $(noconfig_targets) clean CLEAN_%,$(MAKECMDGOALS)),) -include $(KCONFIG_CONFIG) endif TARGET_ARCH:=$(call qstrip,$(TARGET_ARCH)) ifeq ($(TARGET_ARCH),) ARCH ?= $(shell uname -m | $(SED) -e s/i.86/i386/ \ -e s/sun.*/sparc/ -e s/sparc.*/sparc/ \ -e s/arm.*/arm/ -e s/sa110/arm/ \ -e s/sh.*/sh/ \ -e s/s390x/s390/ -e s/parisc.*/hppa/ \ -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \ -e s/xtensa.*/xtensa/ ) else ARCH = $(TARGET_ARCH) endif export ARCH # Make certain these contain a final "/", but no "//"s. scrub_path = $(strip $(subst //,/, $(subst ,/, $(call qstrip,$(1))))) TARGET_SUBARCH := $(call qstrip,$(TARGET_SUBARCH)) RUNTIME_PREFIX := $(call scrub_path,$(RUNTIME_PREFIX)) DEVEL_PREFIX := $(call scrub_path,$(DEVEL_PREFIX)) MULTILIB_DIR := $(call scrub_path,$(MULTILIB_DIR)) KERNEL_HEADERS := $(call scrub_path,$(KERNEL_HEADERS)) export RUNTIME_PREFIX DEVEL_PREFIX KERNEL_HEADERS MULTILIB_DIR # Now config hard core MAJOR_VERSION := 1 MINOR_VERSION := 0 SUBLEVEL := 0 EXTRAVERSION :=-git VERSION := $(MAJOR_VERSION).$(MINOR_VERSION).$(SUBLEVEL) ABI_VERSION := $(MAJOR_VERSION) ifneq ($(EXTRAVERSION),) VERSION := $(VERSION)$(EXTRAVERSION) endif # Ensure consistent sort order, 'gcc -print-search-dirs' behavior, etc. LC_ALL := C export MAJOR_VERSION MINOR_VERSION SUBLEVEL VERSION ABI_VERSION LC_ALL LIBC := libc SHARED_LIBNAME := $(LIBC).so.$(ABI_VERSION) UBACKTRACE_DSO := libubacktrace.so.$(ABI_VERSION) UCLIBC_LDSO_NAME := ld-uClibc ARCH_NATIVE_BIT := 32 ifneq ($(findstring $(TARGET_ARCH) , hppa64 ia64 powerpc64 s390x sparc64 x86_64 ),) UCLIBC_LDSO_NAME := ld64-uClibc ARCH_NATIVE_BIT := 64 else ifeq ($(CONFIG_MIPS_N64_ABI),y) UCLIBC_LDSO_NAME := ld64-uClibc ARCH_NATIVE_BIT := 64 endif endif UCLIBC_LDSO := $(UCLIBC_LDSO_NAME).so.$(ABI_VERSION) NONSHARED_LIBNAME := uclibc_nonshared.a libc := $(top_builddir)lib/$(SHARED_LIBNAME) libc.depend := $(top_builddir)lib/$(SHARED_LIBNAME:.$(ABI_VERSION)=) ifneq ($(ARCH_HAS_NO_SHARED),y) libdl.depend := $(top_builddir)lib/libdl.so endif ifneq ($(HAS_NO_THREADS),y) libpthread.depend := $(top_builddir)lib/libpthread.so endif interp := $(top_builddir)lib/interp.os ldso := $(top_builddir)lib/$(UCLIBC_LDSO) headers_dep := $(top_builddir)include/bits/sysnum.h sub_headers := $(headers_dep) #LIBS :=$(interp) -L$(top_builddir)lib -lc LIBS := $(interp) -L$(top_builddir)lib $(libc:.$(ABI_VERSION)=) # Make sure DESTDIR and PREFIX can be used to install # PREFIX is a uClibcism while DESTDIR is a common GNUism ifndef PREFIX PREFIX = $(DESTDIR) endif ifneq ($(HAVE_SHARED),y) libc := interp := ldso := endif comma:=, space:= # ifeq ($(CROSS_COMPILE),) CROSS_COMPILE=$(call qstrip,$(CROSS_COMPILER_PREFIX)) endif # A nifty macro to make testing gcc features easier check_gcc=$(shell \ if $(CC) $(1) -S -o /dev/null -xc /dev/null > /dev/null 2>&1; \ then echo "$(1)"; else echo "$(2)"; fi) check_as=$(shell \ if $(CC) -Wa,$(1) -Wa,-Z -c -o /dev/null -xassembler /dev/null > /dev/null 2>&1; \ then echo "-Wa,$(1)"; fi) check_ld=$(shell \ if $(CC) $(LDFLAG-fuse-ld) $(CFLAG_-Wl--no-warn-mismatch) -Wl,$(1) $(CFLAG_-nostdlib) -o /dev/null -Wl,-b,binary /dev/null > /dev/null 2>&1; \ then echo "$(1)"; fi) # Use variable indirection here so that we can have variable # names with fun chars in them like equal signs define check-tool-var ifeq ($(filter $(clean_targets) CLEAN_%,$(MAKECMDGOALS)),) _v = $(2)_$(3) ifndef $$(_v) $$(_v) := $$(call $(1),$(subst %, ,$(3))) export $$(_v) endif endif endef # Usage: check-gcc-var, # Check the C compiler to see if it supports . # Export the variable CFLAG_ if it does. define check-gcc-var $(call check-tool-var,check_gcc,CFLAG,$(1)) endef # Usage: check-as-var, # Check the assembler to see if it supports . Export the # variable ASFLAG_ if it does (for invoking the assembler), # as well CFLAG_-Wa (for invoking the compiler driver). define check-as-var $(call check-tool-var,check_as,ASFLAG,$(1)) _v = CFLAG_-Wa$(1) export $$(_v) = $$(if $$(ASFLAG_$(1)),-Wa$$(comma)$$(ASFLAG_$(1))) endef # Usage: check-ld-var, # Check the linker to see if it supports . Export the # variable LDFLAG_ if it does (for invoking the linker), # as well CFLAG_-Wl (for invoking the compiler driver). define check-ld-var $(call check-tool-var,check_ld,LDFLAG,$(1)) _v = CFLAG_-Wl$(1) export $$(_v) = $$(if $$(LDFLAG_$(1)),-Wl$$(comma)$$(LDFLAG_$(1))) endef # Usage: cache-output-var,, # Execute and cache the output in . define cache-output-var ifndef $(1) $(1) := $$(shell $(2)) export $(1) endif endef ARFLAGS:=cr # Note: The check for -nostdlib has to be before all calls to check_ld $(eval $(call check-gcc-var,-nostdlib)) # deliberately not named CFLAG-fuse-ld since unchecked and from user LDFLAG-fuse-ld := $(filter -fuse-ld=%,$(call qstrip,$(UCLIBC_EXTRA_CFLAGS))) # failed to merge target specific data of file /dev/null # Could use -Wl,--script,$(top_srcdir)extra/scripts/none.lds as well. $(eval $(call check-ld-var,--no-warn-mismatch)) $(eval $(call cache-output-var,GCC_VER,$(CC) -dumpversion)) GCC_VER := $(subst ., ,$(GCC_VER)) GCC_MAJOR_VER ?= $(word 1,$(GCC_VER)) GCC_MINOR_VER ?= $(word 2,$(GCC_VER)) # Flags in OPTIMIZATION are used only for non-debug builds OPTIMIZATION:= OPTIMIZATION-$(GCC_MAJOR_VER):= OPTIMIZATION-$(GCC_MAJOR_VER).$(GCC_MINOR_VER):= # Use '-Os' optimization if available, else use -O2, allow Config to override $(eval $(call check-gcc-var,-Os)) ifneq ($(CFLAG_-Os),) OPTIMIZATION += $(CFLAG_-Os) else $(eval $(call check-gcc-var,-O2)) OPTIMIZATION += $(CFLAG_-O2) endif # Use the gcc 3.4 -funit-at-a-time optimization when available $(eval $(call check-gcc-var,-funit-at-a-time)) OPTIMIZATION-3.4 += $(CFLAG_-funit-at-a-time) $(eval $(call check-gcc-var,-fstrict-aliasing)) OPTIMIZATION += $(CFLAG_-fstrict-aliasing) # CPU_CFLAGS-y contain options which are not warnings, # not include or library paths, and not optimizations. # Why -funsigned-char: I hunted a bug related to incorrect # sign extension of 'char' type for 10 hours straight. Not fun. CPU_CFLAGS-y := -funsigned-char -fno-builtin $(eval $(call check-gcc-var,-fno-asm)) CPU_CFLAGS-y += $(CFLAG_-fno-asm) LDADD_LIBFLOAT= ifeq ($(UCLIBC_HAS_SOFT_FLOAT),y) # If -msoft-float isn't supported, we want an error anyway. # Hmm... might need to revisit this for arm since it has 2 different # soft float encodings. ifneq ($(TARGET_ARCH),nios) ifneq ($(TARGET_ARCH),nios2) ifneq ($(TARGET_ARCH),sh) ifneq ($(TARGET_ARCH),c6x) CPU_CFLAGS-y += -msoft-float endif endif endif endif ifeq ($(TARGET_ARCH),arm) # No longer needed with current toolchains, but leave it here for now. # If anyone is actually still using gcc 2.95 (say), they can uncomment it. # LDADD_LIBFLOAT=-lfloat endif endif $(eval $(call check-gcc-var,-std=gnu99)) CPU_CFLAGS-y += $(CFLAG_-std=gnu99) CPU_CFLAGS-$(UCLIBC_FORMAT_SHARED_FLAT) += -mid-shared-library CPU_CFLAGS-$(UCLIBC_FORMAT_FLAT_SEP_DATA) += -msep-data CPU_LDFLAGS-$(ARCH_LITTLE_ENDIAN) += -Wl,-EL CPU_LDFLAGS-$(ARCH_BIG_ENDIAN) += -Wl,-EB PICFLAG-y := -fPIC PICFLAG-$(UCLIBC_FORMAT_FDPIC_ELF) := -mfdpic PICFLAG-$(UCLIBC_FORMAT_DSBT_ELF) := -mdsbt -fpic PICFLAG := $(PICFLAG-y) PIEFLAG_NAME:=-fPIE # Some nice CPU specific optimizations ifeq ($(TARGET_ARCH),i386) $(eval $(call check-gcc-var,-fomit-frame-pointer)) OPTIMIZATION += $(CFLAG_-fomit-frame-pointer) ifeq ($(CONFIG_386)$(CONFIG_486)$(CONFIG_586),y) # TODO: Change this to a gcc version check. This bug # should be fixed with at least gcc-4.3. # Non-SSE capable processor. # NB: this may make SSE insns segfault! # -O1 -march=pentium3, -Os -msse etc are known to be affected. # See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13685 # -m32 is needed if host is 64-bit OPTIMIZATION+=$(call check_gcc,-m32 -mpreferred-stack-boundary=2,) else $(eval $(call check-gcc-var,-mpreferred-stack-boundary=4)) OPTIMIZATION += $(CFLAG_-mpreferred-stack-boundary=4) endif # Choice of alignment (please document why!) # -falign-labels: in-line labels # (reachable by normal code flow, aligning will insert nops # which will be executed - may even make things slower) # -falign-jumps: reachable only by a jump # Generic: no alignment at all (smallest code) GCC_FALIGN=$(call check_gcc,-falign-functions=1 -falign-jumps=1 -falign-labels=1 -falign-loops=1,-malign-jumps=1 -malign-loops=1) OPTIMIZATION+=$(GCC_FALIGN) # Putting each function and data object into its own section # allows for kbytes of less text if users link against static uclibc # using ld --gc-sections. # ld 2.18 can't do that (yet?) for shared libraries, so we itself # do not use --gc-sections at shared lib link time. # However, in combination with sections being sorted by alignment # it does result in much reduced padding: # text data bss dec hex # 235319 1472 5992 242783 3b45f old.so # 234104 1472 5980 241556 3af94 new.so # Without -ffunction-sections, all functions will get aligned # to 4 byte boundary by as/ld. This is arguably a bug in as. # It specifies 4 byte align for .text even if not told to do so: # Idx Name Size VMA LMA File off Algn # 0 .text xxxxxxxx 00000000 00000000 xxxxxxxx 2**2 <===! CPU_CFLAGS-y += $(CFLAG_-ffunction-sections) $(CFLAG_-fdata-sections) CPU_LDFLAGS-y += $(CFLAG_-Wl--sort-common) $(eval $(call check-ld-var,--sort-section=alignment)) CPU_LDFLAGS-y += $(CFLAG_-Wl--sort-section=alignment) CPU_LDFLAGS-y+=-m32 CPU_CFLAGS-y+=-m32 endif ifeq ($(TARGET_ARCH),sparc) CPU_CFLAGS-$(CONFIG_SPARC_V7)+=-mcpu=v7 CPU_CFLAGS-$(CONFIG_SPARC_V8)+=-mcpu=v8 CPU_CFLAGS-$(CONFIG_SPARC_V9)+=-mcpu=v9 CPU_CFLAGS-$(CONFIG_SPARC_V9B)+=$(call check_gcc,-mcpu=v9b,-mcpu=ultrasparc) endif ifeq ($(TARGET_ARCH),arm) CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-mlittle-endian CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mbig-endian CPU_CFLAGS-$(COMPILE_IN_THUMB_MODE)+=-mthumb endif ifeq ($(TARGET_ARCH),metag) SYMBOL_PREFIX=_ CPU_CFLAGS-$(CONFIG_META_1_2)+= CPU_CFLAGS-$(CONFIG_META_2_1)+=-Wa,-mcpu=metac21 endif ifeq ($(TARGET_ARCH),mips) OPTIMIZATION+=-mno-split-addresses CPU_CFLAGS-$(CONFIG_MIPS_N64_ABI)+=-mabi=64 CPU_CFLAGS-$(CONFIG_MIPS_O32_ABI)+=-mabi=32 CPU_CFLAGS-$(CONFIG_MIPS_N32_ABI)+=-mabi=n32 CPU_CFLAGS-$(CONFIG_MIPS_NAN_LEGACY)+=-mnan=legacy CPU_CFLAGS-$(CONFIG_MIPS_NAN_2008)+=-mnan=2008 CPU_LDFLAGS-y += $(CPU_CFLAGS) endif ifeq ($(TARGET_ARCH),nios) OPTIMIZATION+=-funaligned-struct-hack CPU_LDFLAGS-y+=-Wl,-m32 CPU_CFLAGS-y+=-Wl,-m32 endif ifeq ($(TARGET_ARCH),sh) $(eval $(call check-gcc-var,-mprefergot)) OPTIMIZATION += $(CFLAG_-mprefergot) CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-ml CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mb CPU_CFLAGS-$(CONFIG_SH2)+=-m2 CPU_CFLAGS-$(CONFIG_SH3)+=-m3 ifeq ($(UCLIBC_HAS_FPU),y) CPU_CFLAGS-$(CONFIG_SH2A)+=-m2a CPU_CFLAGS-$(CONFIG_SH4)+=-m4 else CPU_CFLAGS-$(CONFIG_SH2A)+=-m2a-nofpu CPU_CFLAGS-$(CONFIG_SH4)+=-m4-nofpu endif endif ifeq ($(TARGET_ARCH),sh64) CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN):=-ml CPU_CFLAGS-$(ARCH_BIG_ENDIAN):=-mb CPU_CFLAGS-$(CONFIG_SH5)+=-m5-32media endif ifeq ($(TARGET_ARCH),h8300) SYMBOL_PREFIX=_ CPU_LDFLAGS-$(CONFIG_H8300H)+= -Wl,-ms8300h CPU_LDFLAGS-$(CONFIG_H8S) += -Wl,-ms8300s CPU_CFLAGS-$(CONFIG_H8300H) += -mh -mint32 CPU_CFLAGS-$(CONFIG_H8S) += -ms -mint32 endif ifeq ($(TARGET_ARCH),i960) OPTIMIZATION+=-mh -mint32 #-fsigned-char endif ifeq ($(TARGET_ARCH),e1) OPTIMIZATION+=-mgnu-param endif ifeq ($(TARGET_ARCH),cris) CPU_LDFLAGS-$(CONFIG_CRIS)+=-Wl,-mcrislinux CPU_LDFLAGS-$(CONFIG_CRISV32)+=-Wl,-mcrislinux CPU_CFLAGS-$(CONFIG_CRIS)+=-mlinux PICFLAG:=-fpic PIEFLAG_NAME:=-fpie endif ifeq ($(TARGET_ARCH),m68k) # -fPIC is only supported for 68020 and above. It is not supported # for 68000, 68010, or Coldfire. PICFLAG:=-fpic PIEFLAG_NAME:=-fpie endif ifeq ($(TARGET_ARCH),powerpc) # PowerPC can hold 8192 entries in its GOT with -fpic which is more than # enough. Therefore use -fpic which will reduce code size and generates # faster code. PICFLAG:=-fpic PIEFLAG_NAME:=-fpie PPC_HAS_REL16:=$(shell echo -e "\t.text\n\taddis 11,30,_GLOBAL_OFFSET_TABLE_-.@ha" | $(CC) -c -x assembler -o /dev/null - 2> /dev/null && echo -n y || echo -n n) CPU_CFLAGS-$(PPC_HAS_REL16)+= -DHAVE_ASM_PPC_REL16 CPU_CFLAGS-$(CONFIG_E500) += "-D__NO_MATH_INLINES" endif ifeq ($(TARGET_ARCH),bfin) SYMBOL_PREFIX=_ ifeq ($(UCLIBC_FORMAT_FDPIC_ELF),y) CPU_CFLAGS-y:=-mfdpic CPU_LDFLAGS-y += -Wl,-melf32bfinfd PICFLAG:=-fpic PIEFLAG_NAME:=-fpie endif ifeq ($(UCLIBC_FORMAT_SHARED_FLAT),y) PICFLAG := -mleaf-id-shared-library endif endif ifeq ($(TARGET_ARCH),frv) CPU_LDFLAGS-$(CONFIG_FRV)+=-Wl,-melf32frvfd # Using -pie causes the program to have an interpreter, which is # forbidden, so we must make do with -shared. Unfortunately, # -shared by itself would get us global function descriptors # and calls through PLTs, dynamic resolution of symbols, etc, # which would break as well, but -Bsymbolic comes to the rescue. export LDPIEFLAG:=-shared -Wl,-Bsymbolic UCLIBC_LDSO=ld.so.1 endif ifeq ($(strip $(TARGET_ARCH)),avr32) CPU_CFLAGS-$(CONFIG_AVR32_AP7) += -march=ap CPU_CFLAGS-$(CONFIG_LINKRELAX) += -mrelax CPU_LDFLAGS-$(CONFIG_LINKRELAX) += --relax endif ifeq ($(TARGET_ARCH),i960) SYMBOL_PREFIX=_ endif ifeq ($(TARGET_ARCH),v850) SYMBOL_PREFIX=_ endif ifeq ($(TARGET_ARCH),c6x) PIEFLAG:= CPU_CFLAGS-$(CONFIG_TMS320C64X) += -march=c64x CPU_CFLAGS-$(CONFIG_TMS320C64XPLUS) += -march=c64x+ CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-mlittle-endian CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mbig-endian CPU_LDFLAGS-y += $(CPU_CFLAGS) endif ifeq ($(TARGET_ARCH),arc) CPU_CFLAGS-y += -mlock -mswape CPU_CFLAGS-$(CONFIG_ARC_CPU_700) += -mA7 CPU_LDFLAGS-y += $(CPU_CFLAGS) -marclinux endif $(eval $(call check-gcc-var,$(PIEFLAG_NAME))) PIEFLAG := $(CFLAG_$(PIEFLAG_NAME)) ifeq ($(PIEFLAG),) PIEFLAG := $(PICFLAG) endif # We need to keep track of both the CC PIE flag (above) as # well as the LD PIE flag (below) because we can't rely on # gcc passing -pie if we used -fPIE. We need to directly use -pie # instead of -Wl,-pie as gcc picks up the wrong startfile/endfile $(eval $(call cache-output-var,LDPIEFLAG,$(CC) -Wl$(comma)--help 2>/dev/null | grep -q -- -pie && echo "-pie")) # Check for --as-needed support in linker ifndef LD_FLAG_ASNEEDED _LD_FLAG_ASNEEDED:=$(shell $(CC) -Wl,--help 2>/dev/null | grep -- --as-needed) ifneq ($(_LD_FLAG_ASNEEDED),) export LD_FLAG_ASNEEDED:=--as-needed endif endif ifndef LD_FLAG_NO_ASNEEDED ifdef LD_FLAG_ASNEEDED export LD_FLAG_NO_ASNEEDED:=--no-as-needed endif endif ifndef CC_FLAG_ASNEEDED ifdef LD_FLAG_ASNEEDED export CC_FLAG_ASNEEDED:=-Wl,$(LD_FLAG_ASNEEDED) endif endif ifndef CC_FLAG_NO_ASNEEDED ifdef LD_FLAG_NO_ASNEEDED export CC_FLAG_NO_ASNEEDED:=-Wl,$(LD_FLAG_NO_ASNEEDED) endif endif link.asneeded = $(if $(findstring yy,$(CC_FLAG_ASNEEDED)$(CC_FLAG_NO_ASNEEDED)),$(CC_FLAG_ASNEEDED) $(1) $(CC_FLAG_NO_ASNEEDED)) # Check for AS_NEEDED support in linker script (binutils>=2.16.1 has it) ifndef ASNEEDED export ASNEEDED:=$(shell $(CC) -Wl,--help 2>/dev/null | grep -q -- --as-needed && echo "AS_NEEDED ( $(UCLIBC_LDSO) )" || echo "$(UCLIBC_LDSO)") # Only used in installed libc.so linker script ifeq ($(UCLIBC_HAS_BACKTRACE),y) ifeq ($(HARDWIRED_ABSPATH),y) UBACKTRACE_FULL_NAME := $(subst //,/,$(RUNTIME_PREFIX)$(MULTILIB_DIR)/$(UBACKTRACE_DSO)) else UBACKTRACE_FULL_NAME := $(UBACKTRACE_DSO) endif export UBACKTRACE_ASNEEDED:=$(shell $(CC) -Wl,--help 2>/dev/null | grep -q -- --as-needed && \ echo "GROUP ( AS_NEEDED ( $(UBACKTRACE_FULL_NAME) ) )" || \ echo "GROUP ( $(UBACKTRACE_FULL_NAME) )") else export UBACKTRACE_ASNEEDED:="" endif endif # Add a bunch of extra pedantic annoyingly strict checks WARNING_FLAGS = -Wstrict-prototypes -Wstrict-aliasing ifeq ($(EXTRA_WARNINGS),y) WARNING_FLAGS += \ -Wformat=2 \ -Wmissing-noreturn \ -Wmissing-format-attribute \ -Wmissing-prototypes \ -Wmissing-declarations \ -Wnested-externs \ -Wnonnull \ -Wold-style-declaration \ -Wold-style-definition \ -Wshadow \ -Wundef # Works only w/ gcc-3.4 and up, can't be checked for gcc-3.x w/ check_gcc() #WARNING_FLAGS-gcc-4 += -Wdeclaration-after-statement endif WARNING_FLAGS += $(WARNING_FLAGS-gcc-$(GCC_MAJOR_VER)) $(foreach w,$(WARNING_FLAGS),$(eval $(call check-gcc-var,$(w)))) XWARNINGS = $(call qstrip,$(WARNINGS)) $(foreach w,$(WARNING_FLAGS),$(CFLAG_$(w))) CPU_CFLAGS=$(call qstrip,$(CPU_CFLAGS-y)) # Save the tested flag in a single variable and force it to be # evaluated just once. Then use that computed value. $(eval $(call check-gcc-var,-fno-stack-protector)) SSP_DISABLE_FLAGS ?= $(CFLAG_-fno-stack-protector) ifeq ($(UCLIBC_BUILD_SSP),y) $(eval $(call check-gcc-var,-fno-stack-protector-all)) $(eval $(call check-gcc-var,-fstack-protector)) $(eval $(call check-gcc-var,-fstack-protector-all)) SSP_CFLAGS := $(CFLAG_-fno-stack-protector-all) SSP_CFLAGS += $(CFLAG_-fstack-protector) SSP_ALL_CFLAGS ?= $(CFLAG_-fstack-protector-all) else SSP_CFLAGS := $(SSP_DISABLE_FLAGS) endif # Collect all CFLAGS components CFLAGS := $(XWARNINGS) $(CPU_CFLAGS) $(SSP_CFLAGS) \ -nostdinc -I$(top_builddir)include \ -I$(top_srcdir)include -include libc-symbols.h \ -I$(top_srcdir)libc/sysdeps/linux/$(TARGET_ARCH) \ -I$(top_srcdir)libc/sysdeps/linux \ -I$(top_srcdir)ldso/ldso/$(TARGET_ARCH) \ -I$(top_srcdir)ldso/include -I. # We need this to be checked within libc-symbols.h ifneq ($(HAVE_SHARED),y) CFLAGS += -DSTATIC endif $(eval $(call check-ld-var,--warn-once)) $(eval $(call check-ld-var,--sort-common)) $(eval $(call check-ld-var,--discard-all)) LDFLAGS_NOSTRIP:=$(LDFLAG-fuse-ld) $(CPU_LDFLAGS-y) -shared \ -Wl,--warn-common $(CFLAG_-Wl--warn-once) -Wl,-z,combreloc # binutils-2.16.1 warns about ignored sections, 2.16.91.0.3 and newer are ok #$(eval $(call check-ld-var,--gc-sections)) #LDFLAGS_NOSTRIP += $(LDFLAG_--gc-sections) $(eval $(call check-gcc-var,-fdata-sections)) $(eval $(call check-gcc-var,-ffunction-sections)) ifeq ($(UCLIBC_BUILD_RELRO),y) LDFLAGS_NOSTRIP+=-Wl,-z,relro endif ifeq ($(UCLIBC_BUILD_NOW),y) LDFLAGS_NOSTRIP+=-Wl,-z,now endif ifeq ($(LDSO_GNU_HASH_SUPPORT),y) # Be sure that binutils support it $(eval $(call check-ld-var,--hash-style=gnu)) ifeq ($(LDFLAG_--hash-style=gnu),) ifneq ($(filter-out $(clean_targets) CLEAN_% install_headers headers-y,$(MAKECMDGOALS)),) $(error Your binutils do not support --hash-style option, while you want to use it) endif else LDFLAGS_NOSTRIP += $(CFLAG_-Wl--hash-style=gnu) endif endif LDFLAGS:=$(LDFLAGS_NOSTRIP) -Wl,-z,defs ifeq ($(DODEBUG),y) CFLAGS += -O0 -g3 -DDEBUG else CFLAGS += $(OPTIMIZATION) CFLAGS += $(OPTIMIZATION-$(GCC_MAJOR_VER)) CFLAGS += $(OPTIMIZATION-$(GCC_MAJOR_VER).$(GCC_MINOR_VER)) endif ifeq ($(DOSTRIP),y) LDFLAGS += -Wl,-s else STRIPTOOL := true -Stripping_disabled endif ifeq ($(DOMULTI),y) # we try to compile all sources at once into an object (IMA), but # gcc-3.3.x does not support it # gcc-3.4.x supports it, but does not need and support --combine. though fails on many sources # gcc-4.0.x supports it, supports the --combine flag, but does not need it # gcc-4.1(200506xx) supports it, but needs the --combine flag, else libs are useless ifeq ($(GCC_MAJOR_VER),3) DOMULTI:=n else $(eval $(call check-gcc-var,--combine)) CFLAGS += $(CFLAG_--combine) endif else DOMULTI:=n endif ifneq ($(strip $(UCLIBC_EXTRA_CFLAGS)),"") CFLAGS += $(call qstrip,$(UCLIBC_EXTRA_CFLAGS)) endif ifneq ($(strip $(UCLIBC_EXTRA_LDFLAGS)),"") LDFLAGS += $(call qstrip,$(UCLIBC_EXTRA_LDFLAGS)) endif ifeq ($(UCLIBC_HAS_STDIO_FUTEXES),y) CFLAGS += -D__USE_STDIO_FUTEXES__ endif ifeq ($(UCLIBC_HAS_THREADS),y) ifeq ($(UCLIBC_HAS_THREADS_NATIVE),y) PTNAME := nptl CFLAGS += -DHAVE_FORCED_UNWIND -D_LIBC_REENTRANT else ifeq ($(LINUXTHREADS_OLD),y) PTNAME := linuxthreads.old else PTNAME := linuxthreads endif endif PTDIR := libpthread/$(PTNAME) # set up system dependencies include dirs (NOTE: order matters!) ifeq ($(UCLIBC_HAS_THREADS_NATIVE),y) PTINC:= -I$(top_builddir)$(PTDIR) \ -I$(top_srcdir)$(PTDIR) \ $(if $(TARGET_SUBARCH),-I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH)/$(TARGET_SUBARCH)) \ -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH) \ -I$(top_builddir)$(PTDIR)/sysdeps/$(TARGET_ARCH) \ -I$(top_srcdir)$(PTDIR)/sysdeps/$(TARGET_ARCH) \ -I$(top_builddir)$(PTDIR)/sysdeps/unix/sysv/linux \ -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux \ -I$(top_srcdir)$(PTDIR)/sysdeps/pthread \ -I$(top_srcdir)$(PTDIR)/sysdeps/pthread/bits \ -I$(top_srcdir)$(PTDIR)/sysdeps/generic # # Test for TLS if NPTL support was selected. # GCC_HAS_TLS=$(shell \ echo "extern __thread int foo;" | $(CC) -o /dev/null -S -xc - 2>&1) ifneq ($(GCC_HAS_TLS),) gcc_tls_test_fail: @echo "####"; @echo "#### Your compiler does not support TLS and you are trying to build uClibc"; @echo "#### with NPTL support. Upgrade your binutils and gcc to versions which"; @echo "#### support TLS for your architecture. Do not contact uClibc maintainers"; @echo "#### about this problem."; @echo "####"; @echo "#### Exiting..."; @echo "####"; @exit 1; endif else PTINC := \ -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH) \ -I$(top_srcdir)$(PTDIR)/sysdeps/$(TARGET_ARCH) \ -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux \ -I$(top_srcdir)$(PTDIR)/sysdeps/pthread \ -I$(top_srcdir)$(PTDIR) \ -I$(top_srcdir)libpthread endif CFLAGS+=$(PTINC) else PTNAME := PTINC := endif CFLAGS += -I$(top_srcdir)libc/sysdeps/linux/common #CFLAGS += -iwithprefix include-fixed -iwithprefix include $(eval $(call cache-output-var,CC_IPREFIX,$(CC) -print-file-name=include)) CC_INC := -isystem $(dir $(CC_IPREFIX))include-fixed -isystem $(CC_IPREFIX) CFLAGS += $(CC_INC) CFLAGS += -I$(KERNEL_HEADERS) ifneq ($(DOASSERTS),y) CFLAGS+=-DNDEBUG endif ifeq ($(SYMBOL_PREFIX),_) CFLAGS+=-D__UCLIBC_UNDERSCORES__ endif # Keep the check_as from being needlessly executed ifeq ($(UCLIBC_BUILD_NOEXECSTACK),y) $(eval $(call check-as-var,--noexecstack)) endif ASFLAGS += $(ASFLAG_--noexecstack) LIBGCC_CFLAGS ?= $(CFLAGS) $(CPU_CFLAGS-y) $(eval $(call cache-output-var,LIBGCC,$(CC) $(LIBGCC_CFLAGS) -print-libgcc-file-name)) LIBGCC_DIR:=$(dir $(LIBGCC)) # moved from libpthread/linuxthreads ifeq ($(UCLIBC_CTOR_DTOR),y) SHARED_START_FILES:=$(top_builddir)lib/crti.o $(LIBGCC_DIR)crtbeginS.o SHARED_END_FILES:=$(LIBGCC_DIR)crtendS.o $(top_builddir)lib/crtn.o endif LOCAL_INSTALL_PATH := $(if $(O),$(O)/)install_dir PTHREAD_GENERATE_MANGLE ?= -n "s/^.*@@@name@@@\([^@]*\)@@@value@@@[^0-9Xxa-fA-F-]*\([0-9Xxa-fA-F-][0-9Xxa-fA-F-]*\).*@@@end@@@.*\$$/\#define \1 \2/p"