Rules.mak 25 KB

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  1. # Rules.mak 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/nds32.*/nds32/ \
  91. -e s/sh.*/sh/ \
  92. -e s/s390x/s390/ -e s/parisc.*/hppa/ \
  93. -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
  94. -e s/xtensa.*/xtensa/ )
  95. else
  96. ARCH = $(TARGET_ARCH)
  97. endif
  98. export ARCH
  99. # Make certain these contain a final "/", but no "//"s.
  100. scrub_path = $(strip $(subst //,/, $(subst ,/, $(call qstrip,$(1)))))
  101. TARGET_SUBARCH := $(call qstrip,$(TARGET_SUBARCH))
  102. RUNTIME_PREFIX := $(call scrub_path,$(RUNTIME_PREFIX))
  103. DEVEL_PREFIX := $(call scrub_path,$(DEVEL_PREFIX))
  104. MULTILIB_DIR := $(call scrub_path,$(MULTILIB_DIR))
  105. KERNEL_HEADERS := $(call scrub_path,$(KERNEL_HEADERS))
  106. export RUNTIME_PREFIX DEVEL_PREFIX KERNEL_HEADERS MULTILIB_DIR
  107. # Now config hard core
  108. MAJOR_VERSION := 1
  109. MINOR_VERSION := 0
  110. SUBLEVEL := 18
  111. EXTRAVERSION :=
  112. VERSION := $(MAJOR_VERSION).$(MINOR_VERSION).$(SUBLEVEL)
  113. ABI_VERSION := $(MAJOR_VERSION)
  114. ifneq ($(EXTRAVERSION),)
  115. VERSION := $(VERSION)$(EXTRAVERSION)
  116. endif
  117. # Ensure consistent sort order, 'gcc -print-search-dirs' behavior, etc.
  118. LC_ALL := C
  119. export MAJOR_VERSION MINOR_VERSION SUBLEVEL VERSION ABI_VERSION LC_ALL
  120. LIBC := libc
  121. SHARED_LIBNAME := $(LIBC).so.$(ABI_VERSION)
  122. UBACKTRACE_DSO := libubacktrace.so.$(ABI_VERSION)
  123. UCLIBC_LDSO_NAME := ld-uClibc
  124. ARCH_NATIVE_BIT := 32
  125. ifneq ($(findstring $(TARGET_ARCH) , hppa64 ia64 powerpc64 s390x sparc64 x86_64 ),)
  126. UCLIBC_LDSO_NAME := ld64-uClibc
  127. ARCH_NATIVE_BIT := 64
  128. else
  129. ifeq ($(CONFIG_MIPS_N64_ABI),y)
  130. UCLIBC_LDSO_NAME := ld64-uClibc
  131. ARCH_NATIVE_BIT := 64
  132. endif
  133. endif
  134. UCLIBC_LDSO := $(UCLIBC_LDSO_NAME).so.$(ABI_VERSION)
  135. NONSHARED_LIBNAME := uclibc_nonshared.a
  136. NONSHARED_LIBPTHREAD := libpthread_nonshared.a
  137. libc := $(top_builddir)lib/$(SHARED_LIBNAME)
  138. libc.depend := $(top_builddir)lib/$(SHARED_LIBNAME:.$(ABI_VERSION)=)
  139. interp := $(top_builddir)lib/interp.os
  140. ldso := $(top_builddir)lib/$(UCLIBC_LDSO)
  141. headers_dep := $(top_builddir)include/bits/sysnum.h \
  142. $(top_builddir)include/bits/uClibc_config.h
  143. sub_headers := $(headers_dep)
  144. LIBS := $(interp) -L$(top_builddir)lib $(libc:.$(ABI_VERSION)=)
  145. # Make sure DESTDIR and PREFIX can be used to install
  146. # PREFIX is a uClibcism while DESTDIR is a common GNUism
  147. ifndef PREFIX
  148. PREFIX = $(DESTDIR)
  149. endif
  150. ifneq ($(HAVE_SHARED),y)
  151. libc :=
  152. interp :=
  153. ldso :=
  154. endif
  155. comma:=,
  156. space:= #
  157. ifeq ($(CROSS_COMPILE),)
  158. CROSS_COMPILE=$(call qstrip,$(CROSS_COMPILER_PREFIX))
  159. endif
  160. # A nifty macro to make testing gcc features easier
  161. check_gcc=$(shell \
  162. if $(CC) $(1) -S -o /dev/null -xc /dev/null > /dev/null 2>&1; \
  163. then echo "$(1)"; else echo "$(2)"; fi)
  164. check_as=$(shell \
  165. if $(CC) -Wa,$(1) -Wa,-Z -c -o /dev/null -xassembler /dev/null > /dev/null 2>&1; \
  166. then echo "-Wa,$(1)"; fi)
  167. check_ld=$(shell \
  168. if $(CC) $(LDFLAG-fuse-ld) $(CFLAG_-Wl--no-warn-mismatch) -Wl,$(1) $(CFLAG_-nostdlib) -o /dev/null -Wl,-b,binary /dev/null > /dev/null 2>&1; \
  169. then echo "$(1)"; fi)
  170. # Use variable indirection here so that we can have variable
  171. # names with fun chars in them like equal signs
  172. define check-tool-var
  173. ifeq ($(filter $(clean_targets) CLEAN_%,$(MAKECMDGOALS)),)
  174. _v = $(2)_$(3)
  175. ifndef $$(_v)
  176. $$(_v) := $$(call $(1),$(subst %, ,$(3)))
  177. export $$(_v)
  178. endif
  179. endif
  180. endef
  181. # Usage: check-gcc-var,<flag>
  182. # Check the C compiler to see if it supports <flag>.
  183. # Export the variable CFLAG_<flag> if it does.
  184. define check-gcc-var
  185. $(call check-tool-var,check_gcc,CFLAG,$(1))
  186. endef
  187. # Usage: check-as-var,<flag>
  188. # Check the assembler to see if it supports <flag>. Export the
  189. # variable ASFLAG_<flag> if it does (for invoking the assembler),
  190. # as well CFLAG_-Wa<flag> (for invoking the compiler driver).
  191. define check-as-var
  192. $(call check-tool-var,check_as,ASFLAG,$(1))
  193. _v = CFLAG_-Wa$(1)
  194. export $$(_v) = $$(if $$(ASFLAG_$(1)),-Wa$$(comma)$$(ASFLAG_$(1)))
  195. endef
  196. # Usage: check-ld-var,<flag>
  197. # Check the linker to see if it supports <flag>. Export the
  198. # variable LDFLAG_<flag> if it does (for invoking the linker),
  199. # as well CFLAG_-Wl<flag> (for invoking the compiler driver).
  200. define check-ld-var
  201. $(call check-tool-var,check_ld,LDFLAG,$(1))
  202. _v = CFLAG_-Wl$(1)
  203. export $$(_v) = $$(if $$(LDFLAG_$(1)),-Wl$$(comma)$$(LDFLAG_$(1)))
  204. endef
  205. # Usage: cache-output-var,<variable>,<shell command>
  206. # Execute <shell command> and cache the output in <variable>.
  207. define cache-output-var
  208. ifndef $(1)
  209. $(1) := $$(shell $(2))
  210. export $(1)
  211. endif
  212. endef
  213. ARFLAGS:=cr
  214. # Note: The check for -nostdlib has to be before all calls to check_ld
  215. $(eval $(call check-gcc-var,-nostdlib))
  216. $(eval $(call check-gcc-var,-nostartfiles))
  217. # deliberately not named CFLAG-fuse-ld since unchecked and from user
  218. LDFLAG-fuse-ld := $(filter -fuse-ld=%,$(call qstrip,$(UCLIBC_EXTRA_CFLAGS)))
  219. # failed to merge target specific data of file /dev/null
  220. # Could use -Wl,--script,$(top_srcdir)extra/scripts/none.lds as well.
  221. $(eval $(call check-ld-var,--no-warn-mismatch))
  222. $(eval $(call cache-output-var,GCC_VER,$(CC) -dumpversion))
  223. GCC_VER := $(subst ., ,$(GCC_VER))
  224. GCC_MAJOR_VER ?= $(word 1,$(GCC_VER))
  225. GCC_MINOR_VER ?= $(word 2,$(GCC_VER))
  226. # Flags in OPTIMIZATION are used only for non-debug builds
  227. OPTIMIZATION:=
  228. OPTIMIZATION-$(GCC_MAJOR_VER):=
  229. OPTIMIZATION-$(GCC_MAJOR_VER).$(GCC_MINOR_VER):=
  230. # Use '-Os' optimization if available, else use -O2, allow Config to override
  231. $(eval $(call check-gcc-var,-Os))
  232. ifneq ($(CFLAG_-Os),)
  233. OPTIMIZATION += $(CFLAG_-Os)
  234. else
  235. $(eval $(call check-gcc-var,-O2))
  236. OPTIMIZATION += $(CFLAG_-O2)
  237. endif
  238. # Use the gcc 3.4 -funit-at-a-time optimization when available
  239. $(eval $(call check-gcc-var,-funit-at-a-time))
  240. OPTIMIZATION-3.4 += $(CFLAG_-funit-at-a-time)
  241. $(eval $(call check-gcc-var,-fstrict-aliasing))
  242. OPTIMIZATION += $(CFLAG_-fstrict-aliasing)
  243. # CPU_CFLAGS-y contain options which are not warnings,
  244. # not include or library paths, and not optimizations.
  245. # Why -funsigned-char: I hunted a bug related to incorrect
  246. # sign extension of 'char' type for 10 hours straight. Not fun.
  247. CPU_CFLAGS-y := -funsigned-char -fno-builtin
  248. $(eval $(call check-gcc-var,-fno-asm))
  249. CPU_CFLAGS-y += $(CFLAG_-fno-asm)
  250. $(eval $(call check-gcc-var,-fmerge-all-constants))
  251. CPU_CFLAGS-y += $(CFLAG_-fmerge-all-constants)
  252. ifeq ($(UCLIBC_HAS_SOFT_FLOAT),y)
  253. ifneq ($(TARGET_ARCH),bfin)
  254. ifneq ($(TARGET_ARCH),lm32)
  255. ifneq ($(TARGET_ARCH),nios2)
  256. ifneq ($(TARGET_ARCH),nds32)
  257. ifneq ($(TARGET_ARCH),sh)
  258. ifneq ($(TARGET_ARCH),c6x)
  259. ifneq ($(TARGET_ARCH),h8300)
  260. ifneq ($(TARGET_ARCH),arc)
  261. CPU_CFLAGS-y += -msoft-float
  262. endif
  263. endif
  264. endif
  265. endif
  266. endif
  267. endif
  268. endif
  269. endif
  270. endif
  271. $(eval $(call check-gcc-var,-std=gnu99))
  272. CPU_CFLAGS-y += $(CFLAG_-std=gnu99)
  273. CPU_CFLAGS-$(UCLIBC_FORMAT_SHARED_FLAT) += -mid-shared-library
  274. CPU_CFLAGS-$(UCLIBC_FORMAT_FLAT_SEP_DATA) += -msep-data
  275. CPU_LDFLAGS-$(ARCH_LITTLE_ENDIAN) += -Wl,-EL
  276. CPU_LDFLAGS-$(ARCH_BIG_ENDIAN) += -Wl,-EB
  277. PICFLAG-y := -fPIC
  278. PICFLAG-$(UCLIBC_FORMAT_FDPIC_ELF) := -mfdpic
  279. PICFLAG-$(UCLIBC_FORMAT_DSBT_ELF) := -mdsbt -fpic
  280. PICFLAG := $(PICFLAG-y)
  281. PIEFLAG_NAME:=-fPIE
  282. $(eval $(call check-gcc-var,-fdata-sections))
  283. $(eval $(call check-gcc-var,-ffunction-sections))
  284. # Some nice CPU specific optimizations
  285. ifeq ($(TARGET_ARCH),i386)
  286. $(eval $(call check-gcc-var,-fomit-frame-pointer))
  287. OPTIMIZATION += $(CFLAG_-fomit-frame-pointer)
  288. ifeq ($(CONFIG_386)$(CONFIG_486)$(CONFIG_586),y)
  289. # TODO: Change this to a gcc version check. This bug
  290. # should be fixed with at least gcc-4.3.
  291. # Non-SSE capable processor.
  292. # NB: this may make SSE insns segfault!
  293. # -O1 -march=pentium3, -Os -msse etc are known to be affected.
  294. # See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13685
  295. # -m32 is needed if host is 64-bit
  296. OPTIMIZATION+=$(call check_gcc,-m32 -mpreferred-stack-boundary=2,)
  297. else
  298. $(eval $(call check-gcc-var,-mpreferred-stack-boundary=4))
  299. OPTIMIZATION += $(CFLAG_-mpreferred-stack-boundary=4)
  300. endif
  301. # Choice of alignment (please document why!)
  302. # -falign-labels: in-line labels
  303. # (reachable by normal code flow, aligning will insert nops
  304. # which will be executed - may even make things slower)
  305. # -falign-jumps: reachable only by a jump
  306. # Generic: no alignment at all (smallest code)
  307. GCC_FALIGN=$(call check_gcc,-falign-functions=1 -falign-jumps=1 -falign-labels=1 -falign-loops=1,-malign-jumps=1 -malign-loops=1)
  308. OPTIMIZATION+=$(GCC_FALIGN)
  309. # Putting each function and data object into its own section
  310. # allows for kbytes of less text if users link against static uclibc
  311. # using ld --gc-sections.
  312. # ld 2.18 can't do that (yet?) for shared libraries, so we itself
  313. # do not use --gc-sections at shared lib link time.
  314. # However, in combination with sections being sorted by alignment
  315. # it does result in much reduced padding:
  316. # text data bss dec hex
  317. # 235319 1472 5992 242783 3b45f old.so
  318. # 234104 1472 5980 241556 3af94 new.so
  319. # Without -ffunction-sections, all functions will get aligned
  320. # to 4 byte boundary by as/ld. This is arguably a bug in as.
  321. # It specifies 4 byte align for .text even if not told to do so:
  322. # Idx Name Size VMA LMA File off Algn
  323. # 0 .text xxxxxxxx 00000000 00000000 xxxxxxxx 2**2 <===!
  324. CPU_CFLAGS-y += $(CFLAG_-ffunction-sections) $(CFLAG_-fdata-sections)
  325. CPU_LDFLAGS-y += $(CFLAG_-Wl--sort-common)
  326. $(eval $(call check-ld-var,--sort-section=alignment))
  327. CPU_LDFLAGS-y += $(CFLAG_-Wl--sort-section=alignment)
  328. CPU_LDFLAGS-y+=-m32
  329. CPU_CFLAGS-y+=-m32
  330. endif
  331. ifeq ($(TARGET_ARCH),sparc)
  332. CPU_CFLAGS-$(CONFIG_SPARC_V7)+=-mcpu=v7
  333. CPU_CFLAGS-$(CONFIG_SPARC_V8)+=-mcpu=v8
  334. CPU_CFLAGS-$(CONFIG_SPARC_V9)+=-mcpu=v9
  335. CPU_CFLAGS-$(CONFIG_SPARC_V9B)+=$(call check_gcc,-mcpu=v9b,-mcpu=ultrasparc)
  336. endif
  337. ifeq ($(TARGET_ARCH),arm)
  338. CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-mlittle-endian
  339. CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mbig-endian
  340. endif
  341. ifeq ($(TARGET_ARCH),metag)
  342. SYMBOL_PREFIX=_
  343. CPU_CFLAGS-$(CONFIG_META_1_2)+=
  344. CPU_CFLAGS-$(CONFIG_META_2_1)+=-Wa,-mcpu=metac21
  345. endif
  346. ifeq ($(TARGET_ARCH),mips)
  347. OPTIMIZATION+=-mno-split-addresses
  348. CPU_CFLAGS-$(CONFIG_MIPS_N64_ABI)+=-mabi=64
  349. CPU_CFLAGS-$(CONFIG_MIPS_O32_ABI)+=-mabi=32
  350. CPU_CFLAGS-$(CONFIG_MIPS_N32_ABI)+=-mabi=n32
  351. CPU_CFLAGS-$(CONFIG_MIPS_NAN_LEGACY)+=-mnan=legacy
  352. CPU_CFLAGS-$(CONFIG_MIPS_NAN_2008)+=-mnan=2008
  353. CPU_LDFLAGS-y += $(CPU_CFLAGS)
  354. endif
  355. ifeq ($(TARGET_ARCH),nds32)
  356. CPU_CFLAGS-$(CONFIG_NDS32_ISA)+=-march=nds32
  357. CFLAGS-.os+= -DPIC
  358. CFLAGS-.oS+= -DPIC
  359. endif
  360. ifeq ($(TARGET_ARCH),sh)
  361. $(eval $(call check-gcc-var,-mprefergot))
  362. OPTIMIZATION += $(CFLAG_-mprefergot)
  363. CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-ml
  364. CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mb
  365. CPU_CFLAGS-$(CONFIG_SH2)+=-m2
  366. CPU_CFLAGS-$(CONFIG_SH3)+=-m3
  367. ifeq ($(UCLIBC_HAS_FPU),y)
  368. CPU_CFLAGS-$(CONFIG_SH2A)+=-m2a
  369. CPU_CFLAGS-$(CONFIG_SH4)+=-m4
  370. CPU_CFLAGS-$(CONFIG_SH4A)+=-m4a
  371. else
  372. CPU_CFLAGS-$(CONFIG_SH2A)+=-m2a-nofpu
  373. CPU_CFLAGS-$(CONFIG_SH4)+=-m4-nofpu
  374. CPU_CFLAGS-$(CONFIG_SH4A)+=-m4a-nofpu
  375. endif
  376. endif
  377. ifeq ($(TARGET_ARCH),h8300)
  378. CPU_CFLAGS-$(CONFIG_H8300H) += -mh -mint32
  379. CPU_CFLAGS-$(CONFIG_H8S) += -ms -mint32
  380. endif
  381. ifeq ($(TARGET_ARCH),cris)
  382. CPU_LDFLAGS-$(CONFIG_CRIS)+=-Wl,-mcrislinux
  383. CPU_LDFLAGS-$(CONFIG_CRISV32)+=-Wl,-mcrislinux
  384. CPU_CFLAGS-$(CONFIG_CRIS)+=-mlinux
  385. PICFLAG:=-fpic
  386. PIEFLAG_NAME:=-fpie
  387. endif
  388. ifeq ($(TARGET_ARCH),m68k)
  389. # -fPIC is only supported for 68020 and above. It is not supported
  390. # for 68000, 68010, or Coldfire.
  391. PICFLAG:=-fpic
  392. PIEFLAG_NAME:=-fpie
  393. endif
  394. ifeq ($(TARGET_ARCH),powerpc)
  395. # PowerPC can hold 8192 entries in its GOT with -fpic which is more than
  396. # enough. Therefore use -fpic which will reduce code size and generates
  397. # faster code.
  398. PICFLAG:=-fpic
  399. PIEFLAG_NAME:=-fpie
  400. PPC_HAS_REL16:=$(shell printf "\t.text\n\taddis 11,30,_GLOBAL_OFFSET_TABLE_-.@ha\n" | $(CC) -c -x assembler -o /dev/null - 2> /dev/null && echo -n y || echo -n n)
  401. CPU_CFLAGS-$(PPC_HAS_REL16)+= -DHAVE_ASM_PPC_REL16
  402. CPU_CFLAGS-$(CONFIG_E500) += "-D__NO_MATH_INLINES"
  403. endif
  404. ifeq ($(TARGET_ARCH),bfin)
  405. SYMBOL_PREFIX=_
  406. ifeq ($(UCLIBC_FORMAT_FDPIC_ELF),y)
  407. CPU_CFLAGS-y:=-mfdpic
  408. CPU_LDFLAGS-y += -Wl,-melf32bfinfd
  409. PICFLAG:=-fpic
  410. PIEFLAG_NAME:=-fpie
  411. endif
  412. ifeq ($(UCLIBC_FORMAT_SHARED_FLAT),y)
  413. PICFLAG := -mleaf-id-shared-library
  414. endif
  415. endif
  416. ifeq ($(TARGET_ARCH),frv)
  417. # Using -pie causes the program to have an interpreter, which is
  418. # forbidden, so we must make do with -shared. Unfortunately,
  419. # -shared by itself would get us global function descriptors
  420. # and calls through PLTs, dynamic resolution of symbols, etc,
  421. # which would break as well, but -Bsymbolic comes to the rescue.
  422. CPU_LDFLAGS-y += -Wl,-melf32frvfd -Wl,-Bsymbolic
  423. endif
  424. ifeq ($(strip $(TARGET_ARCH)),avr32)
  425. CPU_CFLAGS-$(CONFIG_AVR32_AP7) += -march=ap
  426. CPU_CFLAGS-$(CONFIG_LINKRELAX) += -mrelax
  427. CPU_LDFLAGS-$(CONFIG_LINKRELAX) += --relax
  428. endif
  429. ifeq ($(TARGET_ARCH),c6x)
  430. PIEFLAG:=
  431. CPU_CFLAGS-$(CONFIG_TMS320C64X) += -march=c64x
  432. CPU_CFLAGS-$(CONFIG_TMS320C64XPLUS) += -march=c64x+
  433. CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-mlittle-endian
  434. CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mbig-endian
  435. CPU_LDFLAGS-y += $(CPU_CFLAGS)
  436. endif
  437. ifeq ($(TARGET_ARCH),arc)
  438. CPU_CFLAGS-y += -mlock -mswape
  439. CPU_CFLAGS-$(CONFIG_ARC_CPU_700) += -mA7
  440. CPU_CFLAGS-$(CONFIG_ARC_CPU_HS) += -mcpu=archs
  441. CPU_LDFLAGS-y += $(CPU_CFLAGS) -marclinux
  442. endif
  443. $(eval $(call check-gcc-var,$(PIEFLAG_NAME)))
  444. PIEFLAG := $(CFLAG_$(PIEFLAG_NAME))
  445. ifeq ($(PIEFLAG),)
  446. PIEFLAG := $(PICFLAG)
  447. endif
  448. # We need to keep track of both the CC PIE flag (above) as
  449. # well as the LD PIE flag (below) because we can't rely on
  450. # gcc passing -pie if we used -fPIE. We need to directly use -pie
  451. # instead of -Wl,-pie as gcc picks up the wrong startfile/endfile
  452. $(eval $(call cache-output-var,LDPIEFLAG,$(CC) -Wl$(comma)--help 2>/dev/null | grep -q -- -pie && echo "-pie"))
  453. # Check for --as-needed support in linker
  454. ifndef LD_FLAG_ASNEEDED
  455. _LD_FLAG_ASNEEDED:=$(shell $(CC) -Wl,--help 2>/dev/null | grep -- --as-needed)
  456. ifneq ($(_LD_FLAG_ASNEEDED),)
  457. export LD_FLAG_ASNEEDED:=--as-needed
  458. endif
  459. endif
  460. ifndef LD_FLAG_NO_ASNEEDED
  461. ifdef LD_FLAG_ASNEEDED
  462. export LD_FLAG_NO_ASNEEDED:=--no-as-needed
  463. endif
  464. endif
  465. ifndef CC_FLAG_ASNEEDED
  466. ifdef LD_FLAG_ASNEEDED
  467. export CC_FLAG_ASNEEDED:=-Wl,$(LD_FLAG_ASNEEDED)
  468. endif
  469. endif
  470. ifndef CC_FLAG_NO_ASNEEDED
  471. ifdef LD_FLAG_NO_ASNEEDED
  472. export CC_FLAG_NO_ASNEEDED:=-Wl,$(LD_FLAG_NO_ASNEEDED)
  473. endif
  474. endif
  475. link.asneeded = $(if $(CC_FLAG_ASNEEDED),$(if $(CC_FLAG_NO_ASNEEDED),$(CC_FLAG_ASNEEDED) $(1) $(CC_FLAG_NO_ASNEEDED)))
  476. # Check for AS_NEEDED support in linker script (binutils>=2.16.1 has it)
  477. ifndef ASNEEDED
  478. export ASNEEDED:=$(shell $(CC) -Wl,--help 2>/dev/null | grep -q -- --as-needed && echo "AS_NEEDED ( $(UCLIBC_LDSO) )" || echo "$(UCLIBC_LDSO)")
  479. # Only used in installed libc.so linker script
  480. ifeq ($(UCLIBC_HAS_BACKTRACE),y)
  481. ifeq ($(HARDWIRED_ABSPATH),y)
  482. UBACKTRACE_FULL_NAME := $(subst //,/,$(RUNTIME_PREFIX)$(MULTILIB_DIR)/$(UBACKTRACE_DSO))
  483. else
  484. UBACKTRACE_FULL_NAME := $(UBACKTRACE_DSO)
  485. endif
  486. export UBACKTRACE_ASNEEDED:=$(shell $(CC) -Wl,--help 2>/dev/null | grep -q -- --as-needed && \
  487. echo "GROUP ( AS_NEEDED ( $(UBACKTRACE_FULL_NAME) ) )" || \
  488. echo "GROUP ( $(UBACKTRACE_FULL_NAME) )")
  489. else
  490. export UBACKTRACE_ASNEEDED:=""
  491. endif
  492. ifeq ($(UCLIBC_HAS_ARGP),y)
  493. ifeq ($(HARDWIRED_ABSPATH),y)
  494. # Only used in installed libc.so linker script
  495. UARGP_FULL_NAME := $(subst //,/,$(RUNTIME_PREFIX)$(MULTILIB_DIR)/libuargp.so.$(MAJOR_VERSION))
  496. else
  497. UARGP_FULL_NAME := libuargp.so.$(MAJOR_VERSION)
  498. endif
  499. export UARGP_ASNEEDED:=$(shell $(CC) -Wl,--help 2>/dev/null | grep -q -- --as-needed && \
  500. echo "GROUP ( AS_NEEDED ( $(UARGP_FULL_NAME) ) )" || \
  501. echo "GROUP ( $(UARGP_FULL_NAME) )")
  502. else
  503. export UARGP_ASNEEDED:=""
  504. endif
  505. endif
  506. # Add a bunch of extra pedantic annoyingly strict checks
  507. WARNING_FLAGS = -Wstrict-prototypes -Wstrict-aliasing
  508. ifeq ($(EXTRA_WARNINGS),y)
  509. WARNING_FLAGS += \
  510. -Wformat=2 \
  511. -Wmissing-noreturn \
  512. -Wmissing-format-attribute \
  513. -Wmissing-prototypes \
  514. -Wmissing-declarations \
  515. -Wnested-externs \
  516. -Wnonnull \
  517. -Wold-style-declaration \
  518. -Wold-style-definition \
  519. -Wdeclaration-after-statement \
  520. -Wshadow \
  521. -Wundef
  522. endif
  523. WARNING_FLAGS += $(WARNING_FLAGS-gcc-$(GCC_MAJOR_VER))
  524. $(foreach w,$(WARNING_FLAGS),$(eval $(call check-gcc-var,$(w))))
  525. XWARNINGS = $(call qstrip,$(WARNINGS)) $(foreach w,$(WARNING_FLAGS),$(CFLAG_$(w)))
  526. CPU_CFLAGS=$(call qstrip,$(CPU_CFLAGS-y))
  527. # Save the tested flag in a single variable and force it to be
  528. # evaluated just once. Then use that computed value.
  529. $(eval $(call check-gcc-var,-fno-stack-protector))
  530. SSP_DISABLE_FLAGS ?= $(CFLAG_-fno-stack-protector)
  531. ifeq ($(UCLIBC_BUILD_SSP),y)
  532. $(eval $(call check-gcc-var,-fno-stack-protector-all))
  533. $(eval $(call check-gcc-var,-fstack-protector))
  534. $(eval $(call check-gcc-var,-fstack-protector-all))
  535. SSP_CFLAGS := $(CFLAG_-fno-stack-protector-all)
  536. SSP_CFLAGS += $(CFLAG_-fstack-protector)
  537. SSP_ALL_CFLAGS ?= $(CFLAG_-fstack-protector-all)
  538. else
  539. SSP_CFLAGS := $(SSP_DISABLE_FLAGS)
  540. endif
  541. # Collect all CFLAGS components
  542. CFLAGS := $(XWARNINGS) $(CPU_CFLAGS) $(SSP_CFLAGS) \
  543. -nostdinc -I$(top_builddir)include \
  544. -I$(top_srcdir)include -include libc-symbols.h \
  545. -I$(top_srcdir)libc/sysdeps/linux/$(TARGET_ARCH) \
  546. -I$(top_srcdir)libc/sysdeps/linux \
  547. -I$(top_srcdir)ldso/ldso/$(TARGET_ARCH) \
  548. -I$(top_srcdir)ldso/include -I.
  549. # We need this to be checked within libc-symbols.h
  550. ifneq ($(HAVE_SHARED),y)
  551. CFLAGS += -DSTATIC
  552. endif
  553. $(eval $(call check-ld-var,--warn-once))
  554. $(eval $(call check-ld-var,--sort-common))
  555. $(eval $(call check-ld-var,--discard-all))
  556. LDFLAGS_NOSTRIP:=$(LDFLAG-fuse-ld) $(CPU_LDFLAGS-y) -shared \
  557. -Wl,--warn-common $(CFLAG_-Wl--warn-once) -Wl,-z,combreloc
  558. ifeq ($(UCLIBC_BUILD_RELRO),y)
  559. LDFLAGS_NOSTRIP+=-Wl,-z,relro
  560. endif
  561. ifeq ($(UCLIBC_BUILD_NOW),y)
  562. LDFLAGS_NOSTRIP+=-Wl,-z,now
  563. endif
  564. ifeq ($(LDSO_GNU_HASH_SUPPORT),y)
  565. # Be sure that binutils support it
  566. $(eval $(call check-ld-var,--hash-style=gnu))
  567. ifeq ($(LDFLAG_--hash-style=gnu),)
  568. ifneq ($(filter-out $(clean_targets) CLEAN_% install_headers headers-y,$(MAKECMDGOALS)),)
  569. $(error Your binutils do not support --hash-style option, while you want to use it)
  570. endif
  571. else
  572. LDFLAGS_NOSTRIP += $(CFLAG_-Wl--hash-style=gnu)
  573. endif
  574. endif
  575. ifeq ($(DODEBUG),y)
  576. CFLAGS += -O0 -g3 -DDEBUG
  577. else
  578. CFLAGS += $(OPTIMIZATION)
  579. CFLAGS += $(OPTIMIZATION-$(GCC_MAJOR_VER))
  580. CFLAGS += $(OPTIMIZATION-$(GCC_MAJOR_VER).$(GCC_MINOR_VER))
  581. $(eval $(call check-ld-var,-O2))
  582. LDFLAGS_NOSTRIP += $(CFLAG_-Wl-O2)
  583. endif
  584. LDFLAGS:=$(LDFLAGS_NOSTRIP) -Wl,-z,defs
  585. ifeq ($(DOSTRIP),y)
  586. LDFLAGS += -Wl,-s
  587. else
  588. STRIPTOOL := true -Stripping_disabled
  589. endif
  590. ifneq ($(strip $(UCLIBC_EXTRA_CFLAGS)),"")
  591. CFLAGS += $(call qstrip,$(UCLIBC_EXTRA_CFLAGS))
  592. endif
  593. ifneq ($(strip $(UCLIBC_EXTRA_LDFLAGS)),"")
  594. LDFLAGS += $(call qstrip,$(UCLIBC_EXTRA_LDFLAGS))
  595. endif
  596. ifeq ($(UCLIBC_HAS_STDIO_FUTEXES),y)
  597. CFLAGS += -D__USE_STDIO_FUTEXES__
  598. endif
  599. ifeq ($(UCLIBC_HAS_THREADS),y)
  600. ifeq ($(UCLIBC_HAS_THREADS_NATIVE),y)
  601. PTNAME := nptl
  602. CFLAGS += -DHAVE_FORCED_UNWIND -D_LIBC_REENTRANT
  603. else
  604. ifeq ($(UCLIBC_HAS_LINUXTHREADS),y)
  605. PTNAME := linuxthreads
  606. endif
  607. endif
  608. PTDIR := libpthread/$(PTNAME)
  609. # set up system dependencies include dirs (NOTE: order matters!)
  610. ifeq ($(UCLIBC_HAS_THREADS_NATIVE),y)
  611. PTINC:= -I$(top_builddir)$(PTDIR) \
  612. -I$(top_srcdir)$(PTDIR) \
  613. $(if $(TARGET_SUBARCH),-I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH)/$(TARGET_SUBARCH)) \
  614. -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH) \
  615. -I$(top_builddir)$(PTDIR)/sysdeps/$(TARGET_ARCH) \
  616. -I$(top_srcdir)$(PTDIR)/sysdeps/$(TARGET_ARCH) \
  617. -I$(top_builddir)$(PTDIR)/sysdeps/unix/sysv/linux \
  618. -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux \
  619. -I$(top_srcdir)$(PTDIR)/sysdeps/pthread \
  620. -I$(top_srcdir)$(PTDIR)/sysdeps/pthread/bits \
  621. -I$(top_srcdir)$(PTDIR)/sysdeps/generic
  622. #
  623. # Test for TLS if NPTL support was selected.
  624. #
  625. GCC_HAS_TLS=$(shell \
  626. echo "extern __thread int foo;" | $(CC) -o /dev/null -S -xc - 2>&1)
  627. ifneq ($(GCC_HAS_TLS),)
  628. gcc_tls_test_fail:
  629. @echo "####";
  630. @echo "#### Your compiler does not support TLS and you are trying to build uClibc";
  631. @echo "#### with NPTL support. Upgrade your binutils and gcc to versions which";
  632. @echo "#### support TLS for your architecture. Do not contact uClibc maintainers";
  633. @echo "#### about this problem.";
  634. @echo "####";
  635. @echo "#### Exiting...";
  636. @echo "####";
  637. @exit 1;
  638. endif
  639. else
  640. PTINC := \
  641. -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH) \
  642. -I$(top_srcdir)$(PTDIR)/sysdeps/$(TARGET_ARCH) \
  643. -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux \
  644. -I$(top_srcdir)$(PTDIR)/sysdeps/pthread \
  645. -I$(top_srcdir)$(PTDIR) \
  646. -I$(top_srcdir)libpthread
  647. endif
  648. CFLAGS+=$(PTINC)
  649. else
  650. PTNAME :=
  651. PTINC :=
  652. endif
  653. CFLAGS += -I$(top_srcdir)libc/sysdeps/linux/common
  654. #CFLAGS += -iwithprefix include-fixed -iwithprefix include
  655. $(eval $(call cache-output-var,CC_IPREFIX,$(CC) -print-file-name=include))
  656. CC_INC := -isystem $(dir $(CC_IPREFIX))include-fixed -isystem $(CC_IPREFIX)
  657. CFLAGS += $(CC_INC)
  658. CFLAGS += -I$(KERNEL_HEADERS)
  659. ifneq ($(DOASSERTS),y)
  660. CFLAGS+=-DNDEBUG
  661. endif
  662. ifeq ($(SYMBOL_PREFIX),_)
  663. CFLAGS+=-D__UCLIBC_UNDERSCORES__
  664. endif
  665. # Keep the check_as from being needlessly executed
  666. ifeq ($(UCLIBC_BUILD_NOEXECSTACK),y)
  667. $(eval $(call check-as-var,--noexecstack))
  668. endif
  669. ASFLAGS += $(ASFLAG_--noexecstack)
  670. LIBGCC_CFLAGS ?= $(CFLAGS) $(CPU_CFLAGS-y)
  671. $(eval $(call cache-output-var,LIBGCC_A,$(CC) $(LIBGCC_CFLAGS) -print-libgcc-file-name))
  672. $(eval $(call cache-output-var,LIBGCC_EH,$(CC) $(LIBGCC_CFLAGS) -print-file-name=libgcc_eh.a))
  673. # with -O0 we (e.g. lockf) might end up with references to
  674. # _Unwind_Resume, so pull in gcc_eh in this case..
  675. # with a --disable-shared toolchain, libgcc_eh.a and libgcc.a are combined
  676. # in libgcc.a, so check if the printed file exist, before adding to the commandline
  677. LIBGCC_EH_FILE := $(shell if [ -f $(LIBGCC_EH) ]; then echo $(LIBGCC_EH); fi)
  678. LIBGCC_DIR := $(dir $(LIBGCC_A))
  679. LIBGCC := $(LIBGCC_A) $(if $(DODEBUG),$(LIBGCC_EH_FILE))
  680. # moved from libpthread/linuxthreads
  681. ifeq ($(UCLIBC_CTOR_DTOR),y)
  682. SHARED_START_FILES:=$(top_builddir)lib/crti.o $(LIBGCC_DIR)crtbeginS.o
  683. SHARED_END_FILES:=$(LIBGCC_DIR)crtendS.o $(top_builddir)lib/crtn.o
  684. endif
  685. LOCAL_INSTALL_PATH := $(if $(O),$(O)/)install_dir
  686. PTHREAD_GENERATE_MANGLE ?= -n "s/^.*@@@name@@@\([^@]*\)@@@value@@@[^0-9Xxa-fA-F-]*\([0-9Xxa-fA-F-][0-9Xxa-fA-F-]*\).*@@@end@@@.*\$$/\#define \1 \2/p"