Rules.mak 25 KB

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  1. # Rules.make for uClibc
  2. #
  3. # Copyright (C) 2000-2008 Erik Andersen <andersen@uclibc.org>
  4. #
  5. # Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
  6. #
  7. # make nano-doc
  8. # FOO = bar -- recursively expanded variable. Value is remebered verbatim.
  9. # If it contains references to other variables, these references
  10. # are expanded whenever this variable is _substituted_.
  11. # FOO := bar -- simply expanded variable. Right hand is expanded when
  12. # the variable is _defined_. Therefore faster than =.
  13. # FOO ?= bar -- set a value only if it is not already set
  14. # (behaves as =, not :=).
  15. # FOO += bar -- append; if FOO is not defined, acts like = (not :=).
  16. # check for proper make version
  17. ifneq ($(findstring x3.7,x$(MAKE_VERSION)),)
  18. $(error Your make is too old $(MAKE_VERSION). Go get at least 3.80)
  19. endif
  20. #-----------------------------------------------------------
  21. # This file contains rules which are shared between multiple
  22. # Makefiles. All normal configuration options live in the
  23. # file named ".config". Don't mess with this file unless
  24. # you know what you are doing.
  25. clean_targets := clean realclean distclean \
  26. objclean-y headers_clean-y CLEAN_utils
  27. noconfig_targets := menuconfig config nconfig \
  28. oldaskconfig silentoldconfig oldconfig allnoconfig allyesconfig \
  29. alldefconfig randconfig defconfig savedefconfig listnewconfig \
  30. olddefconfig \
  31. xconfig gconfig update-po-config mconf qconf gconf nconf conf \
  32. release dist tags help
  33. #-----------------------------------------------------------
  34. # If you are running a cross compiler, you will want to set
  35. # 'CROSS_COMPILE' to something more interesting ... Target
  36. # architecture is determined by asking the CC compiler what
  37. # arch it compiles things for, so unless your compiler is
  38. # broken, you should not need to specify TARGET_ARCH.
  39. #
  40. # Most people will set this stuff on the command line, i.e.
  41. # make CROSS_COMPILE=arm-linux-
  42. # will build uClibc for 'arm'.
  43. # CROSS is still supported for backward compatibily only
  44. CROSS_COMPILE ?= $(CROSS)
  45. CC = $(CROSS_COMPILE)gcc
  46. AR = $(CROSS_COMPILE)ar
  47. LD = $(CROSS_COMPILE)ld
  48. NM = $(CROSS_COMPILE)nm
  49. OBJDUMP = $(CROSS_COMPILE)objdump
  50. STRIPTOOL = $(CROSS_COMPILE)strip
  51. INSTALL = install
  52. LN = ln
  53. RM = rm -f
  54. TAR = tar
  55. SED = sed
  56. AWK = awk
  57. STRIP_FLAGS ?= -x -R .note -R .comment
  58. # Select the compiler needed to build binaries for your development system
  59. HOSTCC = gcc
  60. BUILD_CFLAGS = -Os
  61. #---------------------------------------------------------
  62. # Nothing beyond this point should ever be touched by mere
  63. # mortals. Unless you hang out with the gods, you should
  64. # probably leave all this stuff alone.
  65. # strip quotes
  66. qstrip = $(strip $(subst ",,$(1)))
  67. #"))
  68. # kconfig stuff
  69. KCONFIG_CONFIG ?= $(top_builddir).config
  70. KCONFIG_CONFIG := $(abspath $(KCONFIG_CONFIG))
  71. export KCONFIG_CONFIG
  72. KCONFIG_AUTOCONFIG := $(dir $(KCONFIG_CONFIG))include/config/auto.conf
  73. export KCONFIG_AUTOCONFIG
  74. KCONFIG_TRISTATE := $(dir $(KCONFIG_CONFIG))include/config/tristate.conf
  75. export KCONFIG_TRISTATE
  76. srctree := $(abspath $(top_srcdir))
  77. export srctree
  78. KCONFIG_AUTOHEADER := $(dir $(KCONFIG_CONFIG))include/generated/autoconf.h
  79. export KCONFIG_AUTOHEADER
  80. Kconfig := $(abspath $(top_srcdir)extra/Configs/Config.in)
  81. # Pull in the user's uClibc configuration
  82. ifeq ($(filter $(noconfig_targets) clean CLEAN_%,$(MAKECMDGOALS)),)
  83. -include $(KCONFIG_CONFIG)
  84. endif
  85. TARGET_ARCH:=$(call qstrip,$(TARGET_ARCH))
  86. ifeq ($(TARGET_ARCH),)
  87. ARCH ?= $(shell uname -m | $(SED) -e s/i.86/i386/ \
  88. -e s/sun.*/sparc/ -e s/sparc.*/sparc/ \
  89. -e s/arm.*/arm/ -e s/sa110/arm/ \
  90. -e s/sh.*/sh/ \
  91. -e s/s390x/s390/ -e s/parisc.*/hppa/ \
  92. -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
  93. -e s/xtensa.*/xtensa/ )
  94. else
  95. ARCH = $(TARGET_ARCH)
  96. endif
  97. export ARCH
  98. # Make certain these contain a final "/", but no "//"s.
  99. scrub_path = $(strip $(subst //,/, $(subst ,/, $(call qstrip,$(1)))))
  100. TARGET_SUBARCH := $(call qstrip,$(TARGET_SUBARCH))
  101. RUNTIME_PREFIX := $(call scrub_path,$(RUNTIME_PREFIX))
  102. DEVEL_PREFIX := $(call scrub_path,$(DEVEL_PREFIX))
  103. MULTILIB_DIR := $(call scrub_path,$(MULTILIB_DIR))
  104. KERNEL_HEADERS := $(call scrub_path,$(KERNEL_HEADERS))
  105. export RUNTIME_PREFIX DEVEL_PREFIX KERNEL_HEADERS MULTILIB_DIR
  106. # Now config hard core
  107. MAJOR_VERSION := 1
  108. MINOR_VERSION := 0
  109. SUBLEVEL := 1
  110. EXTRAVERSION :=-git
  111. VERSION := $(MAJOR_VERSION).$(MINOR_VERSION).$(SUBLEVEL)
  112. ABI_VERSION := $(MAJOR_VERSION)
  113. ifneq ($(EXTRAVERSION),)
  114. VERSION := $(VERSION)$(EXTRAVERSION)
  115. endif
  116. # Ensure consistent sort order, 'gcc -print-search-dirs' behavior, etc.
  117. LC_ALL := C
  118. export MAJOR_VERSION MINOR_VERSION SUBLEVEL VERSION ABI_VERSION LC_ALL
  119. LIBC := libc
  120. SHARED_LIBNAME := $(LIBC).so.$(ABI_VERSION)
  121. UBACKTRACE_DSO := libubacktrace.so.$(ABI_VERSION)
  122. UCLIBC_LDSO_NAME := ld-uClibc
  123. ARCH_NATIVE_BIT := 32
  124. ifneq ($(findstring $(TARGET_ARCH) , hppa64 ia64 powerpc64 s390x sparc64 x86_64 ),)
  125. UCLIBC_LDSO_NAME := ld64-uClibc
  126. ARCH_NATIVE_BIT := 64
  127. else
  128. ifeq ($(CONFIG_MIPS_N64_ABI),y)
  129. UCLIBC_LDSO_NAME := ld64-uClibc
  130. ARCH_NATIVE_BIT := 64
  131. endif
  132. endif
  133. UCLIBC_LDSO := $(UCLIBC_LDSO_NAME).so.$(ABI_VERSION)
  134. NONSHARED_LIBNAME := uclibc_nonshared.a
  135. libc := $(top_builddir)lib/$(SHARED_LIBNAME)
  136. libc.depend := $(top_builddir)lib/$(SHARED_LIBNAME:.$(ABI_VERSION)=)
  137. ifneq ($(ARCH_HAS_NO_SHARED),y)
  138. libdl.depend := $(top_builddir)lib/libdl.so
  139. endif
  140. ifneq ($(HAS_NO_THREADS),y)
  141. libpthread.depend := $(top_builddir)lib/libpthread.so
  142. endif
  143. interp := $(top_builddir)lib/interp.os
  144. ldso := $(top_builddir)lib/$(UCLIBC_LDSO)
  145. headers_dep := $(top_builddir)include/bits/sysnum.h
  146. sub_headers := $(headers_dep)
  147. #LIBS :=$(interp) -L$(top_builddir)lib -lc
  148. LIBS := $(interp) -L$(top_builddir)lib $(libc:.$(ABI_VERSION)=)
  149. # Make sure DESTDIR and PREFIX can be used to install
  150. # PREFIX is a uClibcism while DESTDIR is a common GNUism
  151. ifndef PREFIX
  152. PREFIX = $(DESTDIR)
  153. endif
  154. ifneq ($(HAVE_SHARED),y)
  155. libc :=
  156. interp :=
  157. ldso :=
  158. endif
  159. comma:=,
  160. space:= #
  161. ifeq ($(CROSS_COMPILE),)
  162. CROSS_COMPILE=$(call qstrip,$(CROSS_COMPILER_PREFIX))
  163. endif
  164. # A nifty macro to make testing gcc features easier
  165. check_gcc=$(shell \
  166. if $(CC) $(1) -S -o /dev/null -xc /dev/null > /dev/null 2>&1; \
  167. then echo "$(1)"; else echo "$(2)"; fi)
  168. check_as=$(shell \
  169. if $(CC) -Wa,$(1) -Wa,-Z -c -o /dev/null -xassembler /dev/null > /dev/null 2>&1; \
  170. then echo "-Wa,$(1)"; fi)
  171. check_ld=$(shell \
  172. if $(CC) $(LDFLAG-fuse-ld) $(CFLAG_-Wl--no-warn-mismatch) -Wl,$(1) $(CFLAG_-nostdlib) -o /dev/null -Wl,-b,binary /dev/null > /dev/null 2>&1; \
  173. then echo "$(1)"; fi)
  174. # Use variable indirection here so that we can have variable
  175. # names with fun chars in them like equal signs
  176. define check-tool-var
  177. ifeq ($(filter $(clean_targets) CLEAN_%,$(MAKECMDGOALS)),)
  178. _v = $(2)_$(3)
  179. ifndef $$(_v)
  180. $$(_v) := $$(call $(1),$(subst %, ,$(3)))
  181. export $$(_v)
  182. endif
  183. endif
  184. endef
  185. # Usage: check-gcc-var,<flag>
  186. # Check the C compiler to see if it supports <flag>.
  187. # Export the variable CFLAG_<flag> if it does.
  188. define check-gcc-var
  189. $(call check-tool-var,check_gcc,CFLAG,$(1))
  190. endef
  191. # Usage: check-as-var,<flag>
  192. # Check the assembler to see if it supports <flag>. Export the
  193. # variable ASFLAG_<flag> if it does (for invoking the assembler),
  194. # as well CFLAG_-Wa<flag> (for invoking the compiler driver).
  195. define check-as-var
  196. $(call check-tool-var,check_as,ASFLAG,$(1))
  197. _v = CFLAG_-Wa$(1)
  198. export $$(_v) = $$(if $$(ASFLAG_$(1)),-Wa$$(comma)$$(ASFLAG_$(1)))
  199. endef
  200. # Usage: check-ld-var,<flag>
  201. # Check the linker to see if it supports <flag>. Export the
  202. # variable LDFLAG_<flag> if it does (for invoking the linker),
  203. # as well CFLAG_-Wl<flag> (for invoking the compiler driver).
  204. define check-ld-var
  205. $(call check-tool-var,check_ld,LDFLAG,$(1))
  206. _v = CFLAG_-Wl$(1)
  207. export $$(_v) = $$(if $$(LDFLAG_$(1)),-Wl$$(comma)$$(LDFLAG_$(1)))
  208. endef
  209. # Usage: cache-output-var,<variable>,<shell command>
  210. # Execute <shell command> and cache the output in <variable>.
  211. define cache-output-var
  212. ifndef $(1)
  213. $(1) := $$(shell $(2))
  214. export $(1)
  215. endif
  216. endef
  217. ARFLAGS:=cr
  218. # Note: The check for -nostdlib has to be before all calls to check_ld
  219. $(eval $(call check-gcc-var,-nostdlib))
  220. # deliberately not named CFLAG-fuse-ld since unchecked and from user
  221. LDFLAG-fuse-ld := $(filter -fuse-ld=%,$(call qstrip,$(UCLIBC_EXTRA_CFLAGS)))
  222. # failed to merge target specific data of file /dev/null
  223. # Could use -Wl,--script,$(top_srcdir)extra/scripts/none.lds as well.
  224. $(eval $(call check-ld-var,--no-warn-mismatch))
  225. $(eval $(call cache-output-var,GCC_VER,$(CC) -dumpversion))
  226. GCC_VER := $(subst ., ,$(GCC_VER))
  227. GCC_MAJOR_VER ?= $(word 1,$(GCC_VER))
  228. GCC_MINOR_VER ?= $(word 2,$(GCC_VER))
  229. # Flags in OPTIMIZATION are used only for non-debug builds
  230. OPTIMIZATION:=
  231. OPTIMIZATION-$(GCC_MAJOR_VER):=
  232. OPTIMIZATION-$(GCC_MAJOR_VER).$(GCC_MINOR_VER):=
  233. # Use '-Os' optimization if available, else use -O2, allow Config to override
  234. $(eval $(call check-gcc-var,-Os))
  235. ifneq ($(CFLAG_-Os),)
  236. OPTIMIZATION += $(CFLAG_-Os)
  237. else
  238. $(eval $(call check-gcc-var,-O2))
  239. OPTIMIZATION += $(CFLAG_-O2)
  240. endif
  241. # Use the gcc 3.4 -funit-at-a-time optimization when available
  242. $(eval $(call check-gcc-var,-funit-at-a-time))
  243. OPTIMIZATION-3.4 += $(CFLAG_-funit-at-a-time)
  244. $(eval $(call check-gcc-var,-fstrict-aliasing))
  245. OPTIMIZATION += $(CFLAG_-fstrict-aliasing)
  246. # CPU_CFLAGS-y contain options which are not warnings,
  247. # not include or library paths, and not optimizations.
  248. # Why -funsigned-char: I hunted a bug related to incorrect
  249. # sign extension of 'char' type for 10 hours straight. Not fun.
  250. CPU_CFLAGS-y := -funsigned-char -fno-builtin
  251. $(eval $(call check-gcc-var,-fno-asm))
  252. CPU_CFLAGS-y += $(CFLAG_-fno-asm)
  253. ifeq ($(UCLIBC_HAS_SOFT_FLOAT),y)
  254. ifneq ($(TARGET_ARCH),bfin)
  255. ifneq ($(TARGET_ARCH),nios2)
  256. ifneq ($(TARGET_ARCH),sh)
  257. ifneq ($(TARGET_ARCH),c6x)
  258. CPU_CFLAGS-y += -msoft-float
  259. endif
  260. endif
  261. endif
  262. endif
  263. endif
  264. $(eval $(call check-gcc-var,-std=gnu99))
  265. CPU_CFLAGS-y += $(CFLAG_-std=gnu99)
  266. CPU_CFLAGS-$(UCLIBC_FORMAT_SHARED_FLAT) += -mid-shared-library
  267. CPU_CFLAGS-$(UCLIBC_FORMAT_FLAT_SEP_DATA) += -msep-data
  268. CPU_LDFLAGS-$(ARCH_LITTLE_ENDIAN) += -Wl,-EL
  269. CPU_LDFLAGS-$(ARCH_BIG_ENDIAN) += -Wl,-EB
  270. PICFLAG-y := -fPIC
  271. PICFLAG-$(UCLIBC_FORMAT_FDPIC_ELF) := -mfdpic
  272. PICFLAG-$(UCLIBC_FORMAT_DSBT_ELF) := -mdsbt -fpic
  273. PICFLAG := $(PICFLAG-y)
  274. PIEFLAG_NAME:=-fPIE
  275. # Some nice CPU specific optimizations
  276. ifeq ($(TARGET_ARCH),i386)
  277. $(eval $(call check-gcc-var,-fomit-frame-pointer))
  278. OPTIMIZATION += $(CFLAG_-fomit-frame-pointer)
  279. ifeq ($(CONFIG_386)$(CONFIG_486)$(CONFIG_586),y)
  280. # TODO: Change this to a gcc version check. This bug
  281. # should be fixed with at least gcc-4.3.
  282. # Non-SSE capable processor.
  283. # NB: this may make SSE insns segfault!
  284. # -O1 -march=pentium3, -Os -msse etc are known to be affected.
  285. # See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13685
  286. # -m32 is needed if host is 64-bit
  287. OPTIMIZATION+=$(call check_gcc,-m32 -mpreferred-stack-boundary=2,)
  288. else
  289. $(eval $(call check-gcc-var,-mpreferred-stack-boundary=4))
  290. OPTIMIZATION += $(CFLAG_-mpreferred-stack-boundary=4)
  291. endif
  292. # Choice of alignment (please document why!)
  293. # -falign-labels: in-line labels
  294. # (reachable by normal code flow, aligning will insert nops
  295. # which will be executed - may even make things slower)
  296. # -falign-jumps: reachable only by a jump
  297. # Generic: no alignment at all (smallest code)
  298. GCC_FALIGN=$(call check_gcc,-falign-functions=1 -falign-jumps=1 -falign-labels=1 -falign-loops=1,-malign-jumps=1 -malign-loops=1)
  299. OPTIMIZATION+=$(GCC_FALIGN)
  300. # Putting each function and data object into its own section
  301. # allows for kbytes of less text if users link against static uclibc
  302. # using ld --gc-sections.
  303. # ld 2.18 can't do that (yet?) for shared libraries, so we itself
  304. # do not use --gc-sections at shared lib link time.
  305. # However, in combination with sections being sorted by alignment
  306. # it does result in much reduced padding:
  307. # text data bss dec hex
  308. # 235319 1472 5992 242783 3b45f old.so
  309. # 234104 1472 5980 241556 3af94 new.so
  310. # Without -ffunction-sections, all functions will get aligned
  311. # to 4 byte boundary by as/ld. This is arguably a bug in as.
  312. # It specifies 4 byte align for .text even if not told to do so:
  313. # Idx Name Size VMA LMA File off Algn
  314. # 0 .text xxxxxxxx 00000000 00000000 xxxxxxxx 2**2 <===!
  315. CPU_CFLAGS-y += $(CFLAG_-ffunction-sections) $(CFLAG_-fdata-sections)
  316. CPU_LDFLAGS-y += $(CFLAG_-Wl--sort-common)
  317. $(eval $(call check-ld-var,--sort-section=alignment))
  318. CPU_LDFLAGS-y += $(CFLAG_-Wl--sort-section=alignment)
  319. CPU_LDFLAGS-y+=-m32
  320. CPU_CFLAGS-y+=-m32
  321. endif
  322. ifeq ($(TARGET_ARCH),sparc)
  323. CPU_CFLAGS-$(CONFIG_SPARC_V7)+=-mcpu=v7
  324. CPU_CFLAGS-$(CONFIG_SPARC_V8)+=-mcpu=v8
  325. CPU_CFLAGS-$(CONFIG_SPARC_V9)+=-mcpu=v9
  326. CPU_CFLAGS-$(CONFIG_SPARC_V9B)+=$(call check_gcc,-mcpu=v9b,-mcpu=ultrasparc)
  327. endif
  328. ifeq ($(TARGET_ARCH),arm)
  329. CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-mlittle-endian
  330. CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mbig-endian
  331. CPU_CFLAGS-$(COMPILE_IN_THUMB_MODE)+=-mthumb
  332. endif
  333. ifeq ($(TARGET_ARCH),metag)
  334. SYMBOL_PREFIX=_
  335. CPU_CFLAGS-$(CONFIG_META_1_2)+=
  336. CPU_CFLAGS-$(CONFIG_META_2_1)+=-Wa,-mcpu=metac21
  337. endif
  338. ifeq ($(TARGET_ARCH),mips)
  339. OPTIMIZATION+=-mno-split-addresses
  340. CPU_CFLAGS-$(CONFIG_MIPS_N64_ABI)+=-mabi=64
  341. CPU_CFLAGS-$(CONFIG_MIPS_O32_ABI)+=-mabi=32
  342. CPU_CFLAGS-$(CONFIG_MIPS_N32_ABI)+=-mabi=n32
  343. CPU_LDFLAGS-y += $(CPU_CFLAGS)
  344. endif
  345. ifeq ($(TARGET_ARCH),nios)
  346. OPTIMIZATION+=-funaligned-struct-hack
  347. CPU_LDFLAGS-y+=-Wl,-m32
  348. CPU_CFLAGS-y+=-Wl,-m32
  349. endif
  350. ifeq ($(TARGET_ARCH),sh)
  351. $(eval $(call check-gcc-var,-mprefergot))
  352. OPTIMIZATION += $(CFLAG_-mprefergot)
  353. CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-ml
  354. CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mb
  355. CPU_CFLAGS-$(CONFIG_SH2)+=-m2
  356. CPU_CFLAGS-$(CONFIG_SH3)+=-m3
  357. ifeq ($(UCLIBC_HAS_FPU),y)
  358. CPU_CFLAGS-$(CONFIG_SH2A)+=-m2a
  359. CPU_CFLAGS-$(CONFIG_SH4)+=-m4
  360. else
  361. CPU_CFLAGS-$(CONFIG_SH2A)+=-m2a-nofpu
  362. CPU_CFLAGS-$(CONFIG_SH4)+=-m4-nofpu
  363. endif
  364. endif
  365. ifeq ($(TARGET_ARCH),sh64)
  366. CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN):=-ml
  367. CPU_CFLAGS-$(ARCH_BIG_ENDIAN):=-mb
  368. CPU_CFLAGS-$(CONFIG_SH5)+=-m5-32media
  369. endif
  370. ifeq ($(TARGET_ARCH),h8300)
  371. SYMBOL_PREFIX=_
  372. CPU_LDFLAGS-$(CONFIG_H8300H)+= -Wl,-ms8300h
  373. CPU_LDFLAGS-$(CONFIG_H8S) += -Wl,-ms8300s
  374. CPU_CFLAGS-$(CONFIG_H8300H) += -mh -mint32
  375. CPU_CFLAGS-$(CONFIG_H8S) += -ms -mint32
  376. endif
  377. ifeq ($(TARGET_ARCH),i960)
  378. OPTIMIZATION+=-mh -mint32 #-fsigned-char
  379. endif
  380. ifeq ($(TARGET_ARCH),e1)
  381. OPTIMIZATION+=-mgnu-param
  382. endif
  383. ifeq ($(TARGET_ARCH),cris)
  384. CPU_LDFLAGS-$(CONFIG_CRIS)+=-Wl,-mcrislinux
  385. CPU_LDFLAGS-$(CONFIG_CRISV32)+=-Wl,-mcrislinux
  386. CPU_CFLAGS-$(CONFIG_CRIS)+=-mlinux
  387. PICFLAG:=-fpic
  388. PIEFLAG_NAME:=-fpie
  389. endif
  390. ifeq ($(TARGET_ARCH),m68k)
  391. # -fPIC is only supported for 68020 and above. It is not supported
  392. # for 68000, 68010, or Coldfire.
  393. PICFLAG:=-fpic
  394. PIEFLAG_NAME:=-fpie
  395. endif
  396. ifeq ($(TARGET_ARCH),powerpc)
  397. # PowerPC can hold 8192 entries in its GOT with -fpic which is more than
  398. # enough. Therefore use -fpic which will reduce code size and generates
  399. # faster code.
  400. PICFLAG:=-fpic
  401. PIEFLAG_NAME:=-fpie
  402. PPC_HAS_REL16:=$(shell echo -e "\t.text\n\taddis 11,30,_GLOBAL_OFFSET_TABLE_-.@ha" | $(CC) -c -x assembler -o /dev/null - 2> /dev/null && echo -n y || echo -n n)
  403. CPU_CFLAGS-$(PPC_HAS_REL16)+= -DHAVE_ASM_PPC_REL16
  404. CPU_CFLAGS-$(CONFIG_E500) += "-D__NO_MATH_INLINES"
  405. endif
  406. ifeq ($(TARGET_ARCH),bfin)
  407. SYMBOL_PREFIX=_
  408. ifeq ($(UCLIBC_FORMAT_FDPIC_ELF),y)
  409. CPU_CFLAGS-y:=-mfdpic
  410. CPU_LDFLAGS-y += -Wl,-melf32bfinfd
  411. PICFLAG:=-fpic
  412. PIEFLAG_NAME:=-fpie
  413. endif
  414. ifeq ($(UCLIBC_FORMAT_SHARED_FLAT),y)
  415. PICFLAG := -mleaf-id-shared-library
  416. endif
  417. endif
  418. ifeq ($(TARGET_ARCH),frv)
  419. CPU_LDFLAGS-$(CONFIG_FRV)+=-Wl,-melf32frvfd
  420. # Using -pie causes the program to have an interpreter, which is
  421. # forbidden, so we must make do with -shared. Unfortunately,
  422. # -shared by itself would get us global function descriptors
  423. # and calls through PLTs, dynamic resolution of symbols, etc,
  424. # which would break as well, but -Bsymbolic comes to the rescue.
  425. export LDPIEFLAG:=-shared -Wl,-Bsymbolic
  426. UCLIBC_LDSO=ld.so.1
  427. endif
  428. ifeq ($(strip $(TARGET_ARCH)),avr32)
  429. CPU_CFLAGS-$(CONFIG_AVR32_AP7) += -march=ap
  430. CPU_CFLAGS-$(CONFIG_LINKRELAX) += -mrelax
  431. CPU_LDFLAGS-$(CONFIG_LINKRELAX) += --relax
  432. endif
  433. ifeq ($(TARGET_ARCH),i960)
  434. SYMBOL_PREFIX=_
  435. endif
  436. ifeq ($(TARGET_ARCH),v850)
  437. SYMBOL_PREFIX=_
  438. endif
  439. ifeq ($(TARGET_ARCH),c6x)
  440. PIEFLAG:=
  441. CPU_CFLAGS-$(CONFIG_TMS320C64X) += -march=c64x
  442. CPU_CFLAGS-$(CONFIG_TMS320C64XPLUS) += -march=c64x+
  443. CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-mlittle-endian
  444. CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mbig-endian
  445. CPU_LDFLAGS-y += $(CPU_CFLAGS)
  446. endif
  447. ifeq ($(TARGET_ARCH),arc)
  448. CPU_CFLAGS-y += -mlock -mswape
  449. CPU_CFLAGS-$(CONFIG_ARC_CPU_700) += -mA7
  450. CPU_CFLAGS-$(CONFIG_ARC_CPU_HS) += -mcpu=archs
  451. CPU_LDFLAGS-y += $(CPU_CFLAGS) -marclinux
  452. endif
  453. $(eval $(call check-gcc-var,$(PIEFLAG_NAME)))
  454. PIEFLAG := $(CFLAG_$(PIEFLAG_NAME))
  455. ifeq ($(PIEFLAG),)
  456. PIEFLAG := $(PICFLAG)
  457. endif
  458. # We need to keep track of both the CC PIE flag (above) as
  459. # well as the LD PIE flag (below) because we can't rely on
  460. # gcc passing -pie if we used -fPIE. We need to directly use -pie
  461. # instead of -Wl,-pie as gcc picks up the wrong startfile/endfile
  462. $(eval $(call cache-output-var,LDPIEFLAG,$(CC) -Wl$(comma)--help 2>/dev/null | grep -q -- -pie && echo "-pie"))
  463. # Check for --as-needed support in linker
  464. ifndef LD_FLAG_ASNEEDED
  465. _LD_FLAG_ASNEEDED:=$(shell $(CC) -Wl,--help 2>/dev/null | grep -- --as-needed)
  466. ifneq ($(_LD_FLAG_ASNEEDED),)
  467. export LD_FLAG_ASNEEDED:=--as-needed
  468. endif
  469. endif
  470. ifndef LD_FLAG_NO_ASNEEDED
  471. ifdef LD_FLAG_ASNEEDED
  472. export LD_FLAG_NO_ASNEEDED:=--no-as-needed
  473. endif
  474. endif
  475. ifndef CC_FLAG_ASNEEDED
  476. ifdef LD_FLAG_ASNEEDED
  477. export CC_FLAG_ASNEEDED:=-Wl,$(LD_FLAG_ASNEEDED)
  478. endif
  479. endif
  480. ifndef CC_FLAG_NO_ASNEEDED
  481. ifdef LD_FLAG_NO_ASNEEDED
  482. export CC_FLAG_NO_ASNEEDED:=-Wl,$(LD_FLAG_NO_ASNEEDED)
  483. endif
  484. endif
  485. link.asneeded = $(if $(findstring yy,$(CC_FLAG_ASNEEDED)$(CC_FLAG_NO_ASNEEDED)),$(CC_FLAG_ASNEEDED) $(1) $(CC_FLAG_NO_ASNEEDED))
  486. # Check for AS_NEEDED support in linker script (binutils>=2.16.1 has it)
  487. ifndef ASNEEDED
  488. export ASNEEDED:=$(shell $(CC) -Wl,--help 2>/dev/null | grep -q -- --as-needed && echo "AS_NEEDED ( $(UCLIBC_LDSO) )" || echo "$(UCLIBC_LDSO)")
  489. # Only used in installed libc.so linker script
  490. ifeq ($(UCLIBC_HAS_BACKTRACE),y)
  491. ifeq ($(HARDWIRED_ABSPATH),y)
  492. UBACKTRACE_FULL_NAME := $(subst //,/,$(RUNTIME_PREFIX)$(MULTILIB_DIR)/$(UBACKTRACE_DSO))
  493. else
  494. UBACKTRACE_FULL_NAME := $(UBACKTRACE_DSO)
  495. endif
  496. export UBACKTRACE_ASNEEDED:=$(shell $(CC) -Wl,--help 2>/dev/null | grep -q -- --as-needed && \
  497. echo "GROUP ( AS_NEEDED ( $(UBACKTRACE_FULL_NAME) ) )" || \
  498. echo "GROUP ( $(UBACKTRACE_FULL_NAME) )")
  499. else
  500. export UBACKTRACE_ASNEEDED:=""
  501. endif
  502. endif
  503. # Add a bunch of extra pedantic annoyingly strict checks
  504. WARNING_FLAGS = -Wstrict-prototypes -Wstrict-aliasing
  505. ifeq ($(EXTRA_WARNINGS),y)
  506. WARNING_FLAGS += \
  507. -Wformat=2 \
  508. -Wmissing-noreturn \
  509. -Wmissing-format-attribute \
  510. -Wmissing-prototypes \
  511. -Wmissing-declarations \
  512. -Wnested-externs \
  513. -Wnonnull \
  514. -Wold-style-declaration \
  515. -Wold-style-definition \
  516. -Wshadow \
  517. -Wundef
  518. # Works only w/ gcc-3.4 and up, can't be checked for gcc-3.x w/ check_gcc()
  519. #WARNING_FLAGS-gcc-4 += -Wdeclaration-after-statement
  520. endif
  521. WARNING_FLAGS += $(WARNING_FLAGS-gcc-$(GCC_MAJOR_VER))
  522. $(foreach w,$(WARNING_FLAGS),$(eval $(call check-gcc-var,$(w))))
  523. XWARNINGS = $(call qstrip,$(WARNINGS)) $(foreach w,$(WARNING_FLAGS),$(CFLAG_$(w)))
  524. CPU_CFLAGS=$(call qstrip,$(CPU_CFLAGS-y))
  525. # Save the tested flag in a single variable and force it to be
  526. # evaluated just once. Then use that computed value.
  527. $(eval $(call check-gcc-var,-fno-stack-protector))
  528. SSP_DISABLE_FLAGS ?= $(CFLAG_-fno-stack-protector)
  529. ifeq ($(UCLIBC_BUILD_SSP),y)
  530. $(eval $(call check-gcc-var,-fno-stack-protector-all))
  531. $(eval $(call check-gcc-var,-fstack-protector))
  532. $(eval $(call check-gcc-var,-fstack-protector-all))
  533. SSP_CFLAGS := $(CFLAG_-fno-stack-protector-all)
  534. SSP_CFLAGS += $(CFLAG_-fstack-protector)
  535. SSP_ALL_CFLAGS ?= $(CFLAG_-fstack-protector-all)
  536. else
  537. SSP_CFLAGS := $(SSP_DISABLE_FLAGS)
  538. endif
  539. # Collect all CFLAGS components
  540. CFLAGS := $(XWARNINGS) $(CPU_CFLAGS) $(SSP_CFLAGS) \
  541. -nostdinc -I$(top_builddir)include \
  542. -I$(top_srcdir)include -include libc-symbols.h \
  543. -I$(top_srcdir)libc/sysdeps/linux/$(TARGET_ARCH) \
  544. -I$(top_srcdir)libc/sysdeps/linux \
  545. -I$(top_srcdir)ldso/ldso/$(TARGET_ARCH) \
  546. -I$(top_srcdir)ldso/include -I.
  547. # We need this to be checked within libc-symbols.h
  548. ifneq ($(HAVE_SHARED),y)
  549. CFLAGS += -DSTATIC
  550. endif
  551. $(eval $(call check-ld-var,--warn-once))
  552. $(eval $(call check-ld-var,--sort-common))
  553. $(eval $(call check-ld-var,--discard-all))
  554. LDFLAGS_NOSTRIP:=$(LDFLAG-fuse-ld) $(CPU_LDFLAGS-y) -shared \
  555. -Wl,--warn-common $(CFLAG_-Wl--warn-once) -Wl,-z,combreloc
  556. # binutils-2.16.1 warns about ignored sections, 2.16.91.0.3 and newer are ok
  557. #$(eval $(call check-ld-var,--gc-sections))
  558. #LDFLAGS_NOSTRIP += $(LDFLAG_--gc-sections)
  559. $(eval $(call check-gcc-var,-fdata-sections))
  560. $(eval $(call check-gcc-var,-ffunction-sections))
  561. ifeq ($(UCLIBC_BUILD_RELRO),y)
  562. LDFLAGS_NOSTRIP+=-Wl,-z,relro
  563. endif
  564. ifeq ($(UCLIBC_BUILD_NOW),y)
  565. LDFLAGS_NOSTRIP+=-Wl,-z,now
  566. endif
  567. ifeq ($(LDSO_GNU_HASH_SUPPORT),y)
  568. # Be sure that binutils support it
  569. $(eval $(call check-ld-var,--hash-style=gnu))
  570. ifeq ($(LDFLAG_--hash-style=gnu),)
  571. ifneq ($(filter-out $(clean_targets) CLEAN_% install_headers headers-y,$(MAKECMDGOALS)),)
  572. $(error Your binutils do not support --hash-style option, while you want to use it)
  573. endif
  574. else
  575. LDFLAGS_NOSTRIP += $(CFLAG_-Wl--hash-style=gnu)
  576. endif
  577. endif
  578. LDFLAGS:=$(LDFLAGS_NOSTRIP) -Wl,-z,defs
  579. ifeq ($(DODEBUG),y)
  580. CFLAGS += -O0 -g3 -DDEBUG
  581. else
  582. CFLAGS += $(OPTIMIZATION)
  583. CFLAGS += $(OPTIMIZATION-$(GCC_MAJOR_VER))
  584. CFLAGS += $(OPTIMIZATION-$(GCC_MAJOR_VER).$(GCC_MINOR_VER))
  585. endif
  586. ifeq ($(DOSTRIP),y)
  587. LDFLAGS += -Wl,-s
  588. else
  589. STRIPTOOL := true -Stripping_disabled
  590. endif
  591. ifeq ($(DOMULTI),y)
  592. # we try to compile all sources at once into an object (IMA), but
  593. # gcc-3.3.x does not support it
  594. # gcc-3.4.x supports it, but does not need and support --combine. though fails on many sources
  595. # gcc-4.0.x supports it, supports the --combine flag, but does not need it
  596. # gcc-4.1(200506xx) supports it, but needs the --combine flag, else libs are useless
  597. ifeq ($(GCC_MAJOR_VER),3)
  598. DOMULTI:=n
  599. else
  600. $(eval $(call check-gcc-var,--combine))
  601. CFLAGS += $(CFLAG_--combine)
  602. endif
  603. else
  604. DOMULTI:=n
  605. endif
  606. ifneq ($(strip $(UCLIBC_EXTRA_CFLAGS)),"")
  607. CFLAGS += $(call qstrip,$(UCLIBC_EXTRA_CFLAGS))
  608. endif
  609. ifneq ($(strip $(UCLIBC_EXTRA_LDFLAGS)),"")
  610. LDFLAGS += $(call qstrip,$(UCLIBC_EXTRA_LDFLAGS))
  611. endif
  612. ifeq ($(UCLIBC_HAS_STDIO_FUTEXES),y)
  613. CFLAGS += -D__USE_STDIO_FUTEXES__
  614. endif
  615. ifeq ($(UCLIBC_HAS_THREADS),y)
  616. ifeq ($(UCLIBC_HAS_THREADS_NATIVE),y)
  617. PTNAME := nptl
  618. CFLAGS += -DHAVE_FORCED_UNWIND -D_LIBC_REENTRANT
  619. else
  620. ifeq ($(LINUXTHREADS_OLD),y)
  621. PTNAME := linuxthreads.old
  622. else
  623. PTNAME := linuxthreads
  624. endif
  625. endif
  626. PTDIR := libpthread/$(PTNAME)
  627. # set up system dependencies include dirs (NOTE: order matters!)
  628. ifeq ($(UCLIBC_HAS_THREADS_NATIVE),y)
  629. PTINC:= -I$(top_builddir)$(PTDIR) \
  630. -I$(top_srcdir)$(PTDIR) \
  631. $(if $(TARGET_SUBARCH),-I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH)/$(TARGET_SUBARCH)) \
  632. -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH) \
  633. -I$(top_builddir)$(PTDIR)/sysdeps/$(TARGET_ARCH) \
  634. -I$(top_srcdir)$(PTDIR)/sysdeps/$(TARGET_ARCH) \
  635. -I$(top_builddir)$(PTDIR)/sysdeps/unix/sysv/linux \
  636. -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux \
  637. -I$(top_srcdir)$(PTDIR)/sysdeps/pthread \
  638. -I$(top_srcdir)$(PTDIR)/sysdeps/pthread/bits \
  639. -I$(top_srcdir)$(PTDIR)/sysdeps/generic
  640. #
  641. # Test for TLS if NPTL support was selected.
  642. #
  643. GCC_HAS_TLS=$(shell \
  644. echo "extern __thread int foo;" | $(CC) -o /dev/null -S -xc - 2>&1)
  645. ifneq ($(GCC_HAS_TLS),)
  646. gcc_tls_test_fail:
  647. @echo "####";
  648. @echo "#### Your compiler does not support TLS and you are trying to build uClibc";
  649. @echo "#### with NPTL support. Upgrade your binutils and gcc to versions which";
  650. @echo "#### support TLS for your architecture. Do not contact uClibc maintainers";
  651. @echo "#### about this problem.";
  652. @echo "####";
  653. @echo "#### Exiting...";
  654. @echo "####";
  655. @exit 1;
  656. endif
  657. else
  658. PTINC := \
  659. -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH) \
  660. -I$(top_srcdir)$(PTDIR)/sysdeps/$(TARGET_ARCH) \
  661. -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux \
  662. -I$(top_srcdir)$(PTDIR)/sysdeps/pthread \
  663. -I$(top_srcdir)$(PTDIR) \
  664. -I$(top_srcdir)libpthread
  665. endif
  666. CFLAGS+=$(PTINC)
  667. else
  668. PTNAME :=
  669. PTINC :=
  670. endif
  671. CFLAGS += -I$(top_srcdir)libc/sysdeps/linux/common
  672. #CFLAGS += -iwithprefix include-fixed -iwithprefix include
  673. $(eval $(call cache-output-var,CC_IPREFIX,$(CC) -print-file-name=include))
  674. CC_INC := -isystem $(dir $(CC_IPREFIX))include-fixed -isystem $(CC_IPREFIX)
  675. CFLAGS += $(CC_INC)
  676. CFLAGS += -I$(KERNEL_HEADERS)
  677. ifneq ($(DOASSERTS),y)
  678. CFLAGS+=-DNDEBUG
  679. endif
  680. ifeq ($(SYMBOL_PREFIX),_)
  681. CFLAGS+=-D__UCLIBC_UNDERSCORES__
  682. endif
  683. # Keep the check_as from being needlessly executed
  684. ifeq ($(UCLIBC_BUILD_NOEXECSTACK),y)
  685. $(eval $(call check-as-var,--noexecstack))
  686. endif
  687. ASFLAGS += $(ASFLAG_--noexecstack)
  688. LIBGCC_CFLAGS ?= $(CFLAGS) $(CPU_CFLAGS-y)
  689. $(eval $(call cache-output-var,LIBGCC,$(CC) $(LIBGCC_CFLAGS) -print-libgcc-file-name))
  690. LIBGCC_DIR:=$(dir $(LIBGCC))
  691. # moved from libpthread/linuxthreads
  692. ifeq ($(UCLIBC_CTOR_DTOR),y)
  693. SHARED_START_FILES:=$(top_builddir)lib/crti.o $(LIBGCC_DIR)crtbeginS.o
  694. SHARED_END_FILES:=$(LIBGCC_DIR)crtendS.o $(top_builddir)lib/crtn.o
  695. endif
  696. LOCAL_INSTALL_PATH := $(if $(O),$(O)/)install_dir
  697. PTHREAD_GENERATE_MANGLE ?= -n "s/^.*@@@name@@@\([^@]*\)@@@value@@@[^0-9Xxa-fA-F-]*\([0-9Xxa-fA-F-][0-9Xxa-fA-F-]*\).*@@@end@@@.*\$$/\#define \1 \2/p"