Rules.mak 26 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 := 8
  110. EXTRAVERSION :=
  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. $(top_builddir)include/bits/uClibc_config.h
  147. sub_headers := $(headers_dep)
  148. #LIBS :=$(interp) -L$(top_builddir)lib -lc
  149. LIBS := $(interp) -L$(top_builddir)lib $(libc:.$(ABI_VERSION)=)
  150. # Make sure DESTDIR and PREFIX can be used to install
  151. # PREFIX is a uClibcism while DESTDIR is a common GNUism
  152. ifndef PREFIX
  153. PREFIX = $(DESTDIR)
  154. endif
  155. ifneq ($(HAVE_SHARED),y)
  156. libc :=
  157. interp :=
  158. ldso :=
  159. endif
  160. comma:=,
  161. space:= #
  162. ifeq ($(CROSS_COMPILE),)
  163. CROSS_COMPILE=$(call qstrip,$(CROSS_COMPILER_PREFIX))
  164. endif
  165. # A nifty macro to make testing gcc features easier
  166. check_gcc=$(shell \
  167. if $(CC) $(1) -S -o /dev/null -xc /dev/null > /dev/null 2>&1; \
  168. then echo "$(1)"; else echo "$(2)"; fi)
  169. check_as=$(shell \
  170. if $(CC) -Wa,$(1) -Wa,-Z -c -o /dev/null -xassembler /dev/null > /dev/null 2>&1; \
  171. then echo "-Wa,$(1)"; fi)
  172. check_ld=$(shell \
  173. if $(CC) $(LDFLAG-fuse-ld) $(CFLAG_-Wl--no-warn-mismatch) -Wl,$(1) $(CFLAG_-nostdlib) -o /dev/null -Wl,-b,binary /dev/null > /dev/null 2>&1; \
  174. then echo "$(1)"; fi)
  175. # Use variable indirection here so that we can have variable
  176. # names with fun chars in them like equal signs
  177. define check-tool-var
  178. ifeq ($(filter $(clean_targets) CLEAN_%,$(MAKECMDGOALS)),)
  179. _v = $(2)_$(3)
  180. ifndef $$(_v)
  181. $$(_v) := $$(call $(1),$(subst %, ,$(3)))
  182. export $$(_v)
  183. endif
  184. endif
  185. endef
  186. # Usage: check-gcc-var,<flag>
  187. # Check the C compiler to see if it supports <flag>.
  188. # Export the variable CFLAG_<flag> if it does.
  189. define check-gcc-var
  190. $(call check-tool-var,check_gcc,CFLAG,$(1))
  191. endef
  192. # Usage: check-as-var,<flag>
  193. # Check the assembler to see if it supports <flag>. Export the
  194. # variable ASFLAG_<flag> if it does (for invoking the assembler),
  195. # as well CFLAG_-Wa<flag> (for invoking the compiler driver).
  196. define check-as-var
  197. $(call check-tool-var,check_as,ASFLAG,$(1))
  198. _v = CFLAG_-Wa$(1)
  199. export $$(_v) = $$(if $$(ASFLAG_$(1)),-Wa$$(comma)$$(ASFLAG_$(1)))
  200. endef
  201. # Usage: check-ld-var,<flag>
  202. # Check the linker to see if it supports <flag>. Export the
  203. # variable LDFLAG_<flag> if it does (for invoking the linker),
  204. # as well CFLAG_-Wl<flag> (for invoking the compiler driver).
  205. define check-ld-var
  206. $(call check-tool-var,check_ld,LDFLAG,$(1))
  207. _v = CFLAG_-Wl$(1)
  208. export $$(_v) = $$(if $$(LDFLAG_$(1)),-Wl$$(comma)$$(LDFLAG_$(1)))
  209. endef
  210. # Usage: cache-output-var,<variable>,<shell command>
  211. # Execute <shell command> and cache the output in <variable>.
  212. define cache-output-var
  213. ifndef $(1)
  214. $(1) := $$(shell $(2))
  215. export $(1)
  216. endif
  217. endef
  218. ARFLAGS:=cr
  219. # Note: The check for -nostdlib has to be before all calls to check_ld
  220. $(eval $(call check-gcc-var,-nostdlib))
  221. $(eval $(call check-gcc-var,-nostartfiles))
  222. # deliberately not named CFLAG-fuse-ld since unchecked and from user
  223. LDFLAG-fuse-ld := $(filter -fuse-ld=%,$(call qstrip,$(UCLIBC_EXTRA_CFLAGS)))
  224. # failed to merge target specific data of file /dev/null
  225. # Could use -Wl,--script,$(top_srcdir)extra/scripts/none.lds as well.
  226. $(eval $(call check-ld-var,--no-warn-mismatch))
  227. $(eval $(call cache-output-var,GCC_VER,$(CC) -dumpversion))
  228. GCC_VER := $(subst ., ,$(GCC_VER))
  229. GCC_MAJOR_VER ?= $(word 1,$(GCC_VER))
  230. GCC_MINOR_VER ?= $(word 2,$(GCC_VER))
  231. # Flags in OPTIMIZATION are used only for non-debug builds
  232. OPTIMIZATION:=
  233. OPTIMIZATION-$(GCC_MAJOR_VER):=
  234. OPTIMIZATION-$(GCC_MAJOR_VER).$(GCC_MINOR_VER):=
  235. # Use '-Os' optimization if available, else use -O2, allow Config to override
  236. $(eval $(call check-gcc-var,-Os))
  237. ifneq ($(CFLAG_-Os),)
  238. OPTIMIZATION += $(CFLAG_-Os)
  239. else
  240. $(eval $(call check-gcc-var,-O2))
  241. OPTIMIZATION += $(CFLAG_-O2)
  242. endif
  243. # Use the gcc 3.4 -funit-at-a-time optimization when available
  244. $(eval $(call check-gcc-var,-funit-at-a-time))
  245. OPTIMIZATION-3.4 += $(CFLAG_-funit-at-a-time)
  246. $(eval $(call check-gcc-var,-fstrict-aliasing))
  247. OPTIMIZATION += $(CFLAG_-fstrict-aliasing)
  248. # CPU_CFLAGS-y contain options which are not warnings,
  249. # not include or library paths, and not optimizations.
  250. # Why -funsigned-char: I hunted a bug related to incorrect
  251. # sign extension of 'char' type for 10 hours straight. Not fun.
  252. CPU_CFLAGS-y := -funsigned-char -fno-builtin
  253. $(eval $(call check-gcc-var,-fno-asm))
  254. CPU_CFLAGS-y += $(CFLAG_-fno-asm)
  255. $(eval $(call check-gcc-var,-fmerge-all-constants))
  256. CPU_CFLAGS-y += $(CFLAG_-fmerge-all-constants)
  257. ifeq ($(UCLIBC_HAS_SOFT_FLOAT),y)
  258. ifneq ($(TARGET_ARCH),bfin)
  259. ifneq ($(TARGET_ARCH),lm32)
  260. ifneq ($(TARGET_ARCH),nios2)
  261. ifneq ($(TARGET_ARCH),sh)
  262. ifneq ($(TARGET_ARCH),c6x)
  263. ifneq ($(TARGET_ARCH),h8300)
  264. CPU_CFLAGS-y += -msoft-float
  265. endif
  266. endif
  267. endif
  268. endif
  269. endif
  270. endif
  271. endif
  272. $(eval $(call check-gcc-var,-std=gnu99))
  273. CPU_CFLAGS-y += $(CFLAG_-std=gnu99)
  274. CPU_CFLAGS-$(UCLIBC_FORMAT_SHARED_FLAT) += -mid-shared-library
  275. CPU_CFLAGS-$(UCLIBC_FORMAT_FLAT_SEP_DATA) += -msep-data
  276. CPU_LDFLAGS-$(ARCH_LITTLE_ENDIAN) += -Wl,-EL
  277. CPU_LDFLAGS-$(ARCH_BIG_ENDIAN) += -Wl,-EB
  278. PICFLAG-y := -fPIC
  279. PICFLAG-$(UCLIBC_FORMAT_FDPIC_ELF) := -mfdpic
  280. PICFLAG-$(UCLIBC_FORMAT_DSBT_ELF) := -mdsbt -fpic
  281. PICFLAG := $(PICFLAG-y)
  282. PIEFLAG_NAME:=-fPIE
  283. # Some nice CPU specific optimizations
  284. ifeq ($(TARGET_ARCH),i386)
  285. $(eval $(call check-gcc-var,-fomit-frame-pointer))
  286. OPTIMIZATION += $(CFLAG_-fomit-frame-pointer)
  287. ifeq ($(CONFIG_386)$(CONFIG_486)$(CONFIG_586),y)
  288. # TODO: Change this to a gcc version check. This bug
  289. # should be fixed with at least gcc-4.3.
  290. # Non-SSE capable processor.
  291. # NB: this may make SSE insns segfault!
  292. # -O1 -march=pentium3, -Os -msse etc are known to be affected.
  293. # See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13685
  294. # -m32 is needed if host is 64-bit
  295. OPTIMIZATION+=$(call check_gcc,-m32 -mpreferred-stack-boundary=2,)
  296. else
  297. $(eval $(call check-gcc-var,-mpreferred-stack-boundary=4))
  298. OPTIMIZATION += $(CFLAG_-mpreferred-stack-boundary=4)
  299. endif
  300. # Choice of alignment (please document why!)
  301. # -falign-labels: in-line labels
  302. # (reachable by normal code flow, aligning will insert nops
  303. # which will be executed - may even make things slower)
  304. # -falign-jumps: reachable only by a jump
  305. # Generic: no alignment at all (smallest code)
  306. GCC_FALIGN=$(call check_gcc,-falign-functions=1 -falign-jumps=1 -falign-labels=1 -falign-loops=1,-malign-jumps=1 -malign-loops=1)
  307. OPTIMIZATION+=$(GCC_FALIGN)
  308. # Putting each function and data object into its own section
  309. # allows for kbytes of less text if users link against static uclibc
  310. # using ld --gc-sections.
  311. # ld 2.18 can't do that (yet?) for shared libraries, so we itself
  312. # do not use --gc-sections at shared lib link time.
  313. # However, in combination with sections being sorted by alignment
  314. # it does result in much reduced padding:
  315. # text data bss dec hex
  316. # 235319 1472 5992 242783 3b45f old.so
  317. # 234104 1472 5980 241556 3af94 new.so
  318. # Without -ffunction-sections, all functions will get aligned
  319. # to 4 byte boundary by as/ld. This is arguably a bug in as.
  320. # It specifies 4 byte align for .text even if not told to do so:
  321. # Idx Name Size VMA LMA File off Algn
  322. # 0 .text xxxxxxxx 00000000 00000000 xxxxxxxx 2**2 <===!
  323. CPU_CFLAGS-y += $(CFLAG_-ffunction-sections) $(CFLAG_-fdata-sections)
  324. CPU_LDFLAGS-y += $(CFLAG_-Wl--sort-common)
  325. $(eval $(call check-ld-var,--sort-section=alignment))
  326. CPU_LDFLAGS-y += $(CFLAG_-Wl--sort-section=alignment)
  327. CPU_LDFLAGS-y+=-m32
  328. CPU_CFLAGS-y+=-m32
  329. endif
  330. ifeq ($(TARGET_ARCH),sparc)
  331. CPU_CFLAGS-$(CONFIG_SPARC_V7)+=-mcpu=v7
  332. CPU_CFLAGS-$(CONFIG_SPARC_V8)+=-mcpu=v8
  333. CPU_CFLAGS-$(CONFIG_SPARC_V9)+=-mcpu=v9
  334. CPU_CFLAGS-$(CONFIG_SPARC_V9B)+=$(call check_gcc,-mcpu=v9b,-mcpu=ultrasparc)
  335. endif
  336. ifeq ($(TARGET_ARCH),arm)
  337. CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-mlittle-endian
  338. CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mbig-endian
  339. CPU_CFLAGS-$(COMPILE_IN_THUMB_MODE)+=-mthumb
  340. endif
  341. ifeq ($(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_LDFLAGS-y += $(CPU_CFLAGS)
  352. endif
  353. ifeq ($(TARGET_ARCH),nios)
  354. OPTIMIZATION+=-funaligned-struct-hack
  355. CPU_LDFLAGS-y+=-Wl,-m32
  356. CPU_CFLAGS-y+=-Wl,-m32
  357. endif
  358. ifeq ($(TARGET_ARCH),sh)
  359. $(eval $(call check-gcc-var,-mprefergot))
  360. OPTIMIZATION += $(CFLAG_-mprefergot)
  361. CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-ml
  362. CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mb
  363. CPU_CFLAGS-$(CONFIG_SH2)+=-m2
  364. CPU_CFLAGS-$(CONFIG_SH3)+=-m3
  365. ifeq ($(UCLIBC_HAS_FPU),y)
  366. CPU_CFLAGS-$(CONFIG_SH2A)+=-m2a
  367. CPU_CFLAGS-$(CONFIG_SH4)+=-m4
  368. CPU_CFLAGS-$(CONFIG_SH4A)+=-m4a
  369. else
  370. CPU_CFLAGS-$(CONFIG_SH2A)+=-m2a-nofpu
  371. CPU_CFLAGS-$(CONFIG_SH4)+=-m4-nofpu
  372. CPU_CFLAGS-$(CONFIG_SH4A)+=-m4a-nofpu
  373. endif
  374. endif
  375. ifeq ($(TARGET_ARCH),sh64)
  376. CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN):=-ml
  377. CPU_CFLAGS-$(ARCH_BIG_ENDIAN):=-mb
  378. CPU_CFLAGS-$(CONFIG_SH5)+=-m5-32media
  379. endif
  380. ifeq ($(TARGET_ARCH),h8300)
  381. CPU_LDFLAGS-$(CONFIG_H8300H)+= -Wl,-mh8300h_linux
  382. CPU_LDFLAGS-$(CONFIG_H8S) += -Wl,-mh8300s_linux
  383. CPU_CFLAGS-$(CONFIG_H8300H) += -mh -mint32
  384. CPU_CFLAGS-$(CONFIG_H8S) += -ms -mint32
  385. endif
  386. ifeq ($(TARGET_ARCH),i960)
  387. OPTIMIZATION+=-mh -mint32 #-fsigned-char
  388. endif
  389. ifeq ($(TARGET_ARCH),e1)
  390. OPTIMIZATION+=-mgnu-param
  391. endif
  392. ifeq ($(TARGET_ARCH),cris)
  393. CPU_LDFLAGS-$(CONFIG_CRIS)+=-Wl,-mcrislinux
  394. CPU_LDFLAGS-$(CONFIG_CRISV32)+=-Wl,-mcrislinux
  395. CPU_CFLAGS-$(CONFIG_CRIS)+=-mlinux
  396. PICFLAG:=-fpic
  397. PIEFLAG_NAME:=-fpie
  398. endif
  399. ifeq ($(TARGET_ARCH),m68k)
  400. # -fPIC is only supported for 68020 and above. It is not supported
  401. # for 68000, 68010, or Coldfire.
  402. PICFLAG:=-fpic
  403. PIEFLAG_NAME:=-fpie
  404. endif
  405. ifeq ($(TARGET_ARCH),powerpc)
  406. # PowerPC can hold 8192 entries in its GOT with -fpic which is more than
  407. # enough. Therefore use -fpic which will reduce code size and generates
  408. # faster code.
  409. PICFLAG:=-fpic
  410. PIEFLAG_NAME:=-fpie
  411. PPC_HAS_REL16:=$(shell echo -e "\t.text\n\taddis 11,30,_GLOBAL_OFFSET_TABLE_-.@ha" | $(CC) -c -x assembler -o /dev/null - 2> /dev/null && echo -n y || echo -n n)
  412. CPU_CFLAGS-$(PPC_HAS_REL16)+= -DHAVE_ASM_PPC_REL16
  413. CPU_CFLAGS-$(CONFIG_E500) += "-D__NO_MATH_INLINES"
  414. endif
  415. ifeq ($(TARGET_ARCH),bfin)
  416. SYMBOL_PREFIX=_
  417. ifeq ($(UCLIBC_FORMAT_FDPIC_ELF),y)
  418. CPU_CFLAGS-y:=-mfdpic
  419. CPU_LDFLAGS-y += -Wl,-melf32bfinfd
  420. PICFLAG:=-fpic
  421. PIEFLAG_NAME:=-fpie
  422. endif
  423. ifeq ($(UCLIBC_FORMAT_SHARED_FLAT),y)
  424. PICFLAG := -mleaf-id-shared-library
  425. endif
  426. endif
  427. ifeq ($(TARGET_ARCH),frv)
  428. CPU_LDFLAGS-$(CONFIG_FRV)+=-Wl,-melf32frvfd
  429. # Using -pie causes the program to have an interpreter, which is
  430. # forbidden, so we must make do with -shared. Unfortunately,
  431. # -shared by itself would get us global function descriptors
  432. # and calls through PLTs, dynamic resolution of symbols, etc,
  433. # which would break as well, but -Bsymbolic comes to the rescue.
  434. export LDPIEFLAG:=-shared -Wl,-Bsymbolic
  435. UCLIBC_LDSO=ld.so.1
  436. endif
  437. ifeq ($(strip $(TARGET_ARCH)),avr32)
  438. CPU_CFLAGS-$(CONFIG_AVR32_AP7) += -march=ap
  439. CPU_CFLAGS-$(CONFIG_LINKRELAX) += -mrelax
  440. CPU_LDFLAGS-$(CONFIG_LINKRELAX) += --relax
  441. endif
  442. ifeq ($(TARGET_ARCH),i960)
  443. SYMBOL_PREFIX=_
  444. endif
  445. ifeq ($(TARGET_ARCH),v850)
  446. SYMBOL_PREFIX=_
  447. endif
  448. ifeq ($(TARGET_ARCH),c6x)
  449. PIEFLAG:=
  450. CPU_CFLAGS-$(CONFIG_TMS320C64X) += -march=c64x
  451. CPU_CFLAGS-$(CONFIG_TMS320C64XPLUS) += -march=c64x+
  452. CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-mlittle-endian
  453. CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mbig-endian
  454. CPU_LDFLAGS-y += $(CPU_CFLAGS)
  455. endif
  456. ifeq ($(TARGET_ARCH),arc)
  457. CPU_CFLAGS-y += -mlock -mswape
  458. CPU_CFLAGS-$(CONFIG_ARC_CPU_700) += -mA7
  459. CPU_CFLAGS-$(CONFIG_ARC_CPU_HS) += -mcpu=archs
  460. CPU_LDFLAGS-y += $(CPU_CFLAGS) -marclinux
  461. endif
  462. $(eval $(call check-gcc-var,$(PIEFLAG_NAME)))
  463. PIEFLAG := $(CFLAG_$(PIEFLAG_NAME))
  464. ifeq ($(PIEFLAG),)
  465. PIEFLAG := $(PICFLAG)
  466. endif
  467. # We need to keep track of both the CC PIE flag (above) as
  468. # well as the LD PIE flag (below) because we can't rely on
  469. # gcc passing -pie if we used -fPIE. We need to directly use -pie
  470. # instead of -Wl,-pie as gcc picks up the wrong startfile/endfile
  471. $(eval $(call cache-output-var,LDPIEFLAG,$(CC) -Wl$(comma)--help 2>/dev/null | grep -q -- -pie && echo "-pie"))
  472. # Check for --as-needed support in linker
  473. ifndef LD_FLAG_ASNEEDED
  474. _LD_FLAG_ASNEEDED:=$(shell $(CC) -Wl,--help 2>/dev/null | grep -- --as-needed)
  475. ifneq ($(_LD_FLAG_ASNEEDED),)
  476. export LD_FLAG_ASNEEDED:=--as-needed
  477. endif
  478. endif
  479. ifndef LD_FLAG_NO_ASNEEDED
  480. ifdef LD_FLAG_ASNEEDED
  481. export LD_FLAG_NO_ASNEEDED:=--no-as-needed
  482. endif
  483. endif
  484. ifndef CC_FLAG_ASNEEDED
  485. ifdef LD_FLAG_ASNEEDED
  486. export CC_FLAG_ASNEEDED:=-Wl,$(LD_FLAG_ASNEEDED)
  487. endif
  488. endif
  489. ifndef CC_FLAG_NO_ASNEEDED
  490. ifdef LD_FLAG_NO_ASNEEDED
  491. export CC_FLAG_NO_ASNEEDED:=-Wl,$(LD_FLAG_NO_ASNEEDED)
  492. endif
  493. endif
  494. link.asneeded = $(if $(findstring yy,$(CC_FLAG_ASNEEDED)$(CC_FLAG_NO_ASNEEDED)),$(CC_FLAG_ASNEEDED) $(1) $(CC_FLAG_NO_ASNEEDED))
  495. # Check for AS_NEEDED support in linker script (binutils>=2.16.1 has it)
  496. ifndef ASNEEDED
  497. export ASNEEDED:=$(shell $(CC) -Wl,--help 2>/dev/null | grep -q -- --as-needed && echo "AS_NEEDED ( $(UCLIBC_LDSO) )" || echo "$(UCLIBC_LDSO)")
  498. # Only used in installed libc.so linker script
  499. ifeq ($(UCLIBC_HAS_BACKTRACE),y)
  500. ifeq ($(HARDWIRED_ABSPATH),y)
  501. UBACKTRACE_FULL_NAME := $(subst //,/,$(RUNTIME_PREFIX)$(MULTILIB_DIR)/$(UBACKTRACE_DSO))
  502. else
  503. UBACKTRACE_FULL_NAME := $(UBACKTRACE_DSO)
  504. endif
  505. export UBACKTRACE_ASNEEDED:=$(shell $(CC) -Wl,--help 2>/dev/null | grep -q -- --as-needed && \
  506. echo "GROUP ( AS_NEEDED ( $(UBACKTRACE_FULL_NAME) ) )" || \
  507. echo "GROUP ( $(UBACKTRACE_FULL_NAME) )")
  508. else
  509. export UBACKTRACE_ASNEEDED:=""
  510. endif
  511. endif
  512. # Add a bunch of extra pedantic annoyingly strict checks
  513. WARNING_FLAGS = -Wstrict-prototypes -Wstrict-aliasing
  514. ifeq ($(EXTRA_WARNINGS),y)
  515. WARNING_FLAGS += \
  516. -Wformat=2 \
  517. -Wmissing-noreturn \
  518. -Wmissing-format-attribute \
  519. -Wmissing-prototypes \
  520. -Wmissing-declarations \
  521. -Wnested-externs \
  522. -Wnonnull \
  523. -Wold-style-declaration \
  524. -Wold-style-definition \
  525. -Wshadow \
  526. -Wundef
  527. # Works only w/ gcc-3.4 and up, can't be checked for gcc-3.x w/ check_gcc()
  528. #WARNING_FLAGS-gcc-4 += -Wdeclaration-after-statement
  529. endif
  530. WARNING_FLAGS += $(WARNING_FLAGS-gcc-$(GCC_MAJOR_VER))
  531. $(foreach w,$(WARNING_FLAGS),$(eval $(call check-gcc-var,$(w))))
  532. XWARNINGS = $(call qstrip,$(WARNINGS)) $(foreach w,$(WARNING_FLAGS),$(CFLAG_$(w)))
  533. CPU_CFLAGS=$(call qstrip,$(CPU_CFLAGS-y))
  534. # Save the tested flag in a single variable and force it to be
  535. # evaluated just once. Then use that computed value.
  536. $(eval $(call check-gcc-var,-fno-stack-protector))
  537. SSP_DISABLE_FLAGS ?= $(CFLAG_-fno-stack-protector)
  538. ifeq ($(UCLIBC_BUILD_SSP),y)
  539. $(eval $(call check-gcc-var,-fno-stack-protector-all))
  540. $(eval $(call check-gcc-var,-fstack-protector))
  541. $(eval $(call check-gcc-var,-fstack-protector-all))
  542. SSP_CFLAGS := $(CFLAG_-fno-stack-protector-all)
  543. SSP_CFLAGS += $(CFLAG_-fstack-protector)
  544. SSP_ALL_CFLAGS ?= $(CFLAG_-fstack-protector-all)
  545. else
  546. SSP_CFLAGS := $(SSP_DISABLE_FLAGS)
  547. endif
  548. # Collect all CFLAGS components
  549. CFLAGS := $(XWARNINGS) $(CPU_CFLAGS) $(SSP_CFLAGS) \
  550. -nostdinc -I$(top_builddir)include \
  551. -I$(top_srcdir)include -include libc-symbols.h \
  552. -I$(top_srcdir)libc/sysdeps/linux/$(TARGET_ARCH) \
  553. -I$(top_srcdir)libc/sysdeps/linux \
  554. -I$(top_srcdir)ldso/ldso/$(TARGET_ARCH) \
  555. -I$(top_srcdir)ldso/include -I.
  556. # We need this to be checked within libc-symbols.h
  557. ifneq ($(HAVE_SHARED),y)
  558. CFLAGS += -DSTATIC
  559. endif
  560. $(eval $(call check-ld-var,--warn-once))
  561. $(eval $(call check-ld-var,--sort-common))
  562. $(eval $(call check-ld-var,--discard-all))
  563. LDFLAGS_NOSTRIP:=$(LDFLAG-fuse-ld) $(CPU_LDFLAGS-y) -shared \
  564. -Wl,--warn-common $(CFLAG_-Wl--warn-once) -Wl,-z,combreloc
  565. # binutils-2.16.1 warns about ignored sections, 2.16.91.0.3 and newer are ok
  566. #$(eval $(call check-ld-var,--gc-sections))
  567. #LDFLAGS_NOSTRIP += $(LDFLAG_--gc-sections)
  568. $(eval $(call check-gcc-var,-fdata-sections))
  569. $(eval $(call check-gcc-var,-ffunction-sections))
  570. ifeq ($(UCLIBC_BUILD_RELRO),y)
  571. LDFLAGS_NOSTRIP+=-Wl,-z,relro
  572. endif
  573. ifeq ($(UCLIBC_BUILD_NOW),y)
  574. LDFLAGS_NOSTRIP+=-Wl,-z,now
  575. endif
  576. ifeq ($(LDSO_GNU_HASH_SUPPORT),y)
  577. # Be sure that binutils support it
  578. $(eval $(call check-ld-var,--hash-style=gnu))
  579. ifeq ($(LDFLAG_--hash-style=gnu),)
  580. ifneq ($(filter-out $(clean_targets) CLEAN_% install_headers headers-y,$(MAKECMDGOALS)),)
  581. $(error Your binutils do not support --hash-style option, while you want to use it)
  582. endif
  583. else
  584. LDFLAGS_NOSTRIP += $(CFLAG_-Wl--hash-style=gnu)
  585. endif
  586. endif
  587. ifeq ($(DODEBUG),y)
  588. CFLAGS += -O0 -g3 -DDEBUG
  589. else
  590. CFLAGS += $(OPTIMIZATION)
  591. CFLAGS += $(OPTIMIZATION-$(GCC_MAJOR_VER))
  592. CFLAGS += $(OPTIMIZATION-$(GCC_MAJOR_VER).$(GCC_MINOR_VER))
  593. $(eval $(call check-ld-var,-O2))
  594. LDFLAGS_NOSTRIP += $(CFLAG_-Wl-O2)
  595. endif
  596. LDFLAGS:=$(LDFLAGS_NOSTRIP) -Wl,-z,defs
  597. ifeq ($(DOSTRIP),y)
  598. LDFLAGS += -Wl,-s
  599. else
  600. STRIPTOOL := true -Stripping_disabled
  601. endif
  602. ifeq ($(DOMULTI),y)
  603. # we try to compile all sources at once into an object (IMA), but
  604. # gcc-3.3.x does not support it
  605. # gcc-3.4.x supports it, but does not need and support --combine. though fails on many sources
  606. # gcc-4.0.x supports it, supports the --combine flag, but does not need it
  607. # gcc-4.1(200506xx) supports it, but needs the --combine flag, else libs are useless
  608. ifeq ($(GCC_MAJOR_VER),3)
  609. DOMULTI:=n
  610. else
  611. $(eval $(call check-gcc-var,--combine))
  612. CFLAGS += $(CFLAG_--combine)
  613. endif
  614. else
  615. DOMULTI:=n
  616. endif
  617. ifneq ($(strip $(UCLIBC_EXTRA_CFLAGS)),"")
  618. CFLAGS += $(call qstrip,$(UCLIBC_EXTRA_CFLAGS))
  619. endif
  620. ifneq ($(strip $(UCLIBC_EXTRA_LDFLAGS)),"")
  621. LDFLAGS += $(call qstrip,$(UCLIBC_EXTRA_LDFLAGS))
  622. endif
  623. ifeq ($(UCLIBC_HAS_STDIO_FUTEXES),y)
  624. CFLAGS += -D__USE_STDIO_FUTEXES__
  625. endif
  626. ifeq ($(UCLIBC_HAS_THREADS),y)
  627. ifeq ($(UCLIBC_HAS_THREADS_NATIVE),y)
  628. PTNAME := nptl
  629. CFLAGS += -DHAVE_FORCED_UNWIND -D_LIBC_REENTRANT
  630. else
  631. ifeq ($(LINUXTHREADS_OLD),y)
  632. PTNAME := linuxthreads.old
  633. else
  634. PTNAME := linuxthreads
  635. endif
  636. endif
  637. PTDIR := libpthread/$(PTNAME)
  638. # set up system dependencies include dirs (NOTE: order matters!)
  639. ifeq ($(UCLIBC_HAS_THREADS_NATIVE),y)
  640. PTINC:= -I$(top_builddir)$(PTDIR) \
  641. -I$(top_srcdir)$(PTDIR) \
  642. $(if $(TARGET_SUBARCH),-I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH)/$(TARGET_SUBARCH)) \
  643. -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH) \
  644. -I$(top_builddir)$(PTDIR)/sysdeps/$(TARGET_ARCH) \
  645. -I$(top_srcdir)$(PTDIR)/sysdeps/$(TARGET_ARCH) \
  646. -I$(top_builddir)$(PTDIR)/sysdeps/unix/sysv/linux \
  647. -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux \
  648. -I$(top_srcdir)$(PTDIR)/sysdeps/pthread \
  649. -I$(top_srcdir)$(PTDIR)/sysdeps/pthread/bits \
  650. -I$(top_srcdir)$(PTDIR)/sysdeps/generic
  651. #
  652. # Test for TLS if NPTL support was selected.
  653. #
  654. GCC_HAS_TLS=$(shell \
  655. echo "extern __thread int foo;" | $(CC) -o /dev/null -S -xc - 2>&1)
  656. ifneq ($(GCC_HAS_TLS),)
  657. gcc_tls_test_fail:
  658. @echo "####";
  659. @echo "#### Your compiler does not support TLS and you are trying to build uClibc";
  660. @echo "#### with NPTL support. Upgrade your binutils and gcc to versions which";
  661. @echo "#### support TLS for your architecture. Do not contact uClibc maintainers";
  662. @echo "#### about this problem.";
  663. @echo "####";
  664. @echo "#### Exiting...";
  665. @echo "####";
  666. @exit 1;
  667. endif
  668. else
  669. PTINC := \
  670. -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH) \
  671. -I$(top_srcdir)$(PTDIR)/sysdeps/$(TARGET_ARCH) \
  672. -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux \
  673. -I$(top_srcdir)$(PTDIR)/sysdeps/pthread \
  674. -I$(top_srcdir)$(PTDIR) \
  675. -I$(top_srcdir)libpthread
  676. endif
  677. CFLAGS+=$(PTINC)
  678. else
  679. PTNAME :=
  680. PTINC :=
  681. endif
  682. CFLAGS += -I$(top_srcdir)libc/sysdeps/linux/common
  683. #CFLAGS += -iwithprefix include-fixed -iwithprefix include
  684. $(eval $(call cache-output-var,CC_IPREFIX,$(CC) -print-file-name=include))
  685. CC_INC := -isystem $(dir $(CC_IPREFIX))include-fixed -isystem $(CC_IPREFIX)
  686. CFLAGS += $(CC_INC)
  687. CFLAGS += -I$(KERNEL_HEADERS)
  688. ifneq ($(DOASSERTS),y)
  689. CFLAGS+=-DNDEBUG
  690. endif
  691. ifeq ($(SYMBOL_PREFIX),_)
  692. CFLAGS+=-D__UCLIBC_UNDERSCORES__
  693. endif
  694. # Keep the check_as from being needlessly executed
  695. ifeq ($(UCLIBC_BUILD_NOEXECSTACK),y)
  696. $(eval $(call check-as-var,--noexecstack))
  697. endif
  698. ASFLAGS += $(ASFLAG_--noexecstack)
  699. LIBGCC_CFLAGS ?= $(CFLAGS) $(CPU_CFLAGS-y)
  700. $(eval $(call cache-output-var,LIBGCC_A,$(CC) $(LIBGCC_CFLAGS) -print-libgcc-file-name))
  701. $(eval $(call cache-output-var,LIBGCC_EH,$(CC) $(LIBGCC_CFLAGS) -print-file-name=libgcc_eh.a))
  702. # with -O0 we (e.g. lockf) might end up with references to
  703. # _Unwind_Resume, so pull in gcc_eh in this case..
  704. LIBGCC_DIR := $(dir $(LIBGCC_A))
  705. LIBGCC := $(LIBGCC_A) $(if $(DODEBUG),$(LIBGCC_EH))
  706. # moved from libpthread/linuxthreads
  707. ifeq ($(UCLIBC_CTOR_DTOR),y)
  708. SHARED_START_FILES:=$(top_builddir)lib/crti.o $(LIBGCC_DIR)crtbeginS.o
  709. SHARED_END_FILES:=$(LIBGCC_DIR)crtendS.o $(top_builddir)lib/crtn.o
  710. endif
  711. LOCAL_INSTALL_PATH := $(if $(O),$(O)/)install_dir
  712. PTHREAD_GENERATE_MANGLE ?= -n "s/^.*@@@name@@@\([^@]*\)@@@value@@@[^0-9Xxa-fA-F-]*\([0-9Xxa-fA-F-][0-9Xxa-fA-F-]*\).*@@@end@@@.*\$$/\#define \1 \2/p"