Rules.mak 24 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 := 21
  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. 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. NONSHARED_LIBPTHREAD := libpthread_nonshared.a
  136. libc := $(top_builddir)lib/$(SHARED_LIBNAME)
  137. libc.depend := $(top_builddir)lib/$(SHARED_LIBNAME:.$(ABI_VERSION)=)
  138. interp := $(top_builddir)lib/interp.os
  139. ldso := $(top_builddir)lib/$(UCLIBC_LDSO)
  140. headers_dep := $(top_builddir)include/bits/sysnum.h \
  141. $(top_builddir)include/bits/uClibc_config.h
  142. sub_headers := $(headers_dep)
  143. LIBS := $(interp) -L$(top_builddir)lib $(libc:.$(ABI_VERSION)=)
  144. # Make sure DESTDIR and PREFIX can be used to install
  145. # PREFIX is a uClibcism while DESTDIR is a common GNUism
  146. ifndef PREFIX
  147. PREFIX = $(DESTDIR)
  148. endif
  149. ifneq ($(HAVE_SHARED),y)
  150. libc :=
  151. interp :=
  152. ldso :=
  153. endif
  154. comma:=,
  155. space:= #
  156. ifeq ($(CROSS_COMPILE),)
  157. CROSS_COMPILE=$(call qstrip,$(CROSS_COMPILER_PREFIX))
  158. endif
  159. # A nifty macro to make testing gcc features easier
  160. check_gcc=$(shell \
  161. if $(CC) $(1) -S -o /dev/null -xc /dev/null > /dev/null 2>&1; \
  162. then echo "$(1)"; else echo "$(2)"; fi)
  163. check_as=$(shell \
  164. if $(CC) -Wa,$(1) -Wa,-Z -c -o /dev/null -xassembler /dev/null > /dev/null 2>&1; \
  165. then echo "-Wa,$(1)"; fi)
  166. check_ld=$(shell \
  167. if $(CC) $(LDFLAG-fuse-ld) $(CFLAG_-Wl--no-warn-mismatch) -Wl,$(1) $(CFLAG_-nostdlib) -o /dev/null -Wl,-b,binary /dev/null > /dev/null 2>&1; \
  168. then echo "$(1)"; fi)
  169. # Use variable indirection here so that we can have variable
  170. # names with fun chars in them like equal signs
  171. define check-tool-var
  172. ifeq ($(filter $(clean_targets) CLEAN_%,$(MAKECMDGOALS)),)
  173. _v = $(2)_$(3)
  174. ifndef $$(_v)
  175. $$(_v) := $$(call $(1),$(subst %, ,$(3)))
  176. export $$(_v)
  177. endif
  178. endif
  179. endef
  180. # Usage: check-gcc-var,<flag>
  181. # Check the C compiler to see if it supports <flag>.
  182. # Export the variable CFLAG_<flag> if it does.
  183. define check-gcc-var
  184. $(call check-tool-var,check_gcc,CFLAG,$(1))
  185. endef
  186. # Usage: check-as-var,<flag>
  187. # Check the assembler to see if it supports <flag>. Export the
  188. # variable ASFLAG_<flag> if it does (for invoking the assembler),
  189. # as well CFLAG_-Wa<flag> (for invoking the compiler driver).
  190. define check-as-var
  191. $(call check-tool-var,check_as,ASFLAG,$(1))
  192. _v = CFLAG_-Wa$(1)
  193. export $$(_v) = $$(if $$(ASFLAG_$(1)),-Wa$$(comma)$$(ASFLAG_$(1)))
  194. endef
  195. # Usage: check-ld-var,<flag>
  196. # Check the linker to see if it supports <flag>. Export the
  197. # variable LDFLAG_<flag> if it does (for invoking the linker),
  198. # as well CFLAG_-Wl<flag> (for invoking the compiler driver).
  199. define check-ld-var
  200. $(call check-tool-var,check_ld,LDFLAG,$(1))
  201. _v = CFLAG_-Wl$(1)
  202. export $$(_v) = $$(if $$(LDFLAG_$(1)),-Wl$$(comma)$$(LDFLAG_$(1)))
  203. endef
  204. # Usage: cache-output-var,<variable>,<shell command>
  205. # Execute <shell command> and cache the output in <variable>.
  206. define cache-output-var
  207. ifndef $(1)
  208. $(1) := $$(shell $(2))
  209. export $(1)
  210. endif
  211. endef
  212. ARFLAGS:=cr
  213. # Note: The check for -nostdlib has to be before all calls to check_ld
  214. $(eval $(call check-gcc-var,-nostdlib))
  215. $(eval $(call check-gcc-var,-nostartfiles))
  216. # deliberately not named CFLAG-fuse-ld since unchecked and from user
  217. LDFLAG-fuse-ld := $(filter -fuse-ld=%,$(call qstrip,$(UCLIBC_EXTRA_CFLAGS)))
  218. # failed to merge target specific data of file /dev/null
  219. # Could use -Wl,--script,$(top_srcdir)extra/scripts/none.lds as well.
  220. $(eval $(call check-ld-var,--no-warn-mismatch))
  221. $(eval $(call cache-output-var,GCC_VER,$(CC) -dumpversion))
  222. GCC_VER := $(subst ., ,$(GCC_VER))
  223. GCC_MAJOR_VER ?= $(word 1,$(GCC_VER))
  224. GCC_MINOR_VER ?= $(word 2,$(GCC_VER))
  225. # Flags in OPTIMIZATION are used only for non-debug builds
  226. OPTIMIZATION:=
  227. OPTIMIZATION-$(GCC_MAJOR_VER):=
  228. OPTIMIZATION-$(GCC_MAJOR_VER).$(GCC_MINOR_VER):=
  229. # Use '-Os' optimization if available, else use -O2, allow Config to override
  230. $(eval $(call check-gcc-var,-Os))
  231. ifneq ($(CFLAG_-Os),)
  232. OPTIMIZATION += $(CFLAG_-Os)
  233. else
  234. $(eval $(call check-gcc-var,-O2))
  235. OPTIMIZATION += $(CFLAG_-O2)
  236. endif
  237. # Use the gcc 3.4 -funit-at-a-time optimization when available
  238. $(eval $(call check-gcc-var,-funit-at-a-time))
  239. OPTIMIZATION-3.4 += $(CFLAG_-funit-at-a-time)
  240. $(eval $(call check-gcc-var,-fstrict-aliasing))
  241. OPTIMIZATION += $(CFLAG_-fstrict-aliasing)
  242. # CPU_CFLAGS-y contain options which are not warnings,
  243. # not include or library paths, and not optimizations.
  244. # Why -funsigned-char: I hunted a bug related to incorrect
  245. # sign extension of 'char' type for 10 hours straight. Not fun.
  246. CPU_CFLAGS-y := -funsigned-char -fno-builtin
  247. $(eval $(call check-gcc-var,-fno-asm))
  248. CPU_CFLAGS-y += $(CFLAG_-fno-asm)
  249. $(eval $(call check-gcc-var,-fmerge-all-constants))
  250. CPU_CFLAGS-y += $(CFLAG_-fmerge-all-constants)
  251. ifeq ($(UCLIBC_HAS_SOFT_FLOAT),y)
  252. ifneq ($(TARGET_ARCH),bfin)
  253. ifneq ($(TARGET_ARCH),lm32)
  254. ifneq ($(TARGET_ARCH),nios2)
  255. ifneq ($(TARGET_ARCH),nds32)
  256. ifneq ($(TARGET_ARCH),sh)
  257. ifneq ($(TARGET_ARCH),c6x)
  258. ifneq ($(TARGET_ARCH),h8300)
  259. ifneq ($(TARGET_ARCH),arc)
  260. CPU_CFLAGS-y += -msoft-float
  261. endif
  262. endif
  263. endif
  264. endif
  265. endif
  266. endif
  267. endif
  268. endif
  269. endif
  270. $(eval $(call check-gcc-var,-std=gnu99))
  271. CPU_CFLAGS-y += $(CFLAG_-std=gnu99)
  272. CPU_CFLAGS-$(UCLIBC_FORMAT_SHARED_FLAT) += -mid-shared-library
  273. CPU_CFLAGS-$(UCLIBC_FORMAT_FLAT_SEP_DATA) += -msep-data
  274. CPU_LDFLAGS-$(ARCH_LITTLE_ENDIAN) += -Wl,-EL
  275. CPU_LDFLAGS-$(ARCH_BIG_ENDIAN) += -Wl,-EB
  276. PICFLAG-y := -fPIC
  277. PICFLAG-$(UCLIBC_FORMAT_FDPIC_ELF) := -mfdpic
  278. PICFLAG-$(UCLIBC_FORMAT_DSBT_ELF) := -mdsbt -fpic
  279. PICFLAG := $(PICFLAG-y)
  280. PIEFLAG_NAME:=-fPIE
  281. $(eval $(call check-gcc-var,-fdata-sections))
  282. $(eval $(call check-gcc-var,-ffunction-sections))
  283. # Some nice CPU specific optimizations
  284. ifeq ($(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. endif
  340. ifeq ($(TARGET_ARCH),metag)
  341. SYMBOL_PREFIX=_
  342. CPU_CFLAGS-$(CONFIG_META_1_2)+=
  343. CPU_CFLAGS-$(CONFIG_META_2_1)+=-Wa,-mcpu=metac21
  344. endif
  345. ifeq ($(TARGET_ARCH),mips)
  346. OPTIMIZATION+=-mno-split-addresses
  347. CPU_CFLAGS-$(CONFIG_MIPS_N64_ABI)+=-mabi=64
  348. CPU_CFLAGS-$(CONFIG_MIPS_O32_ABI)+=-mabi=32
  349. CPU_CFLAGS-$(CONFIG_MIPS_N32_ABI)+=-mabi=n32
  350. CPU_CFLAGS-$(CONFIG_MIPS_NAN_LEGACY)+=$(call check_gcc,-mnan=legacy)
  351. CPU_CFLAGS-$(CONFIG_MIPS_NAN_2008)+=$(call check_gcc,-mnan=2008)
  352. CPU_LDFLAGS-y += $(CPU_CFLAGS)
  353. endif
  354. ifeq ($(TARGET_ARCH),nds32)
  355. CPU_CFLAGS-$(CONFIG_NDS32_ISA)+=-march=nds32
  356. CFLAGS-.os+= -DPIC
  357. CFLAGS-.oS+= -DPIC
  358. endif
  359. ifeq ($(TARGET_ARCH),sh)
  360. $(eval $(call check-gcc-var,-mprefergot))
  361. OPTIMIZATION += $(CFLAG_-mprefergot)
  362. CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-ml
  363. CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mb
  364. CPU_CFLAGS-$(CONFIG_SH2)+=-m2
  365. CPU_CFLAGS-$(CONFIG_SH3)+=-m3
  366. ifeq ($(UCLIBC_HAS_FPU),y)
  367. CPU_CFLAGS-$(CONFIG_SH2A)+=-m2a
  368. CPU_CFLAGS-$(CONFIG_SH4)+=-m4
  369. CPU_CFLAGS-$(CONFIG_SH4A)+=-m4a
  370. else
  371. CPU_CFLAGS-$(CONFIG_SH2A)+=-m2a-nofpu
  372. CPU_CFLAGS-$(CONFIG_SH4)+=-m4-nofpu
  373. CPU_CFLAGS-$(CONFIG_SH4A)+=-m4a-nofpu
  374. endif
  375. endif
  376. ifeq ($(TARGET_ARCH),h8300)
  377. CPU_CFLAGS-$(CONFIG_H8300H) += -mh -mint32
  378. CPU_CFLAGS-$(CONFIG_H8S) += -ms -mint32
  379. endif
  380. ifeq ($(TARGET_ARCH),cris)
  381. CPU_LDFLAGS-$(CONFIG_CRIS)+=-Wl,-mcrislinux
  382. CPU_LDFLAGS-$(CONFIG_CRISV32)+=-Wl,-mcrislinux
  383. CPU_CFLAGS-$(CONFIG_CRIS)+=-mlinux
  384. PICFLAG:=-fpic
  385. PIEFLAG_NAME:=-fpie
  386. endif
  387. ifeq ($(TARGET_ARCH),m68k)
  388. # -fPIC is only supported for 68020 and above. It is not supported
  389. # for 68000, 68010, or Coldfire.
  390. PICFLAG:=-fpic
  391. PIEFLAG_NAME:=-fpie
  392. endif
  393. ifeq ($(TARGET_ARCH),powerpc)
  394. # PowerPC can hold 8192 entries in its GOT with -fpic which is more than
  395. # enough. Therefore use -fpic which will reduce code size and generates
  396. # faster code.
  397. PICFLAG:=-fpic
  398. PIEFLAG_NAME:=-fpie
  399. PPC_HAS_REL16:=$(shell printf "\t.text\n\taddis 11,30,_GLOBAL_OFFSET_TABLE_-.@ha\n" | $(CC) -c -x assembler -o /dev/null - 2> /dev/null && echo -n y || echo -n n)
  400. CPU_CFLAGS-$(PPC_HAS_REL16)+= -DHAVE_ASM_PPC_REL16
  401. CPU_CFLAGS-$(CONFIG_E500) += "-D__NO_MATH_INLINES"
  402. endif
  403. ifeq ($(TARGET_ARCH),bfin)
  404. SYMBOL_PREFIX=_
  405. ifeq ($(UCLIBC_FORMAT_FDPIC_ELF),y)
  406. CPU_CFLAGS-y:=-mfdpic
  407. CPU_LDFLAGS-y += -Wl,-melf32bfinfd
  408. PICFLAG:=-fpic
  409. PIEFLAG_NAME:=-fpie
  410. endif
  411. ifeq ($(UCLIBC_FORMAT_SHARED_FLAT),y)
  412. PICFLAG := -mleaf-id-shared-library
  413. endif
  414. endif
  415. ifeq ($(TARGET_ARCH),frv)
  416. # Using -pie causes the program to have an interpreter, which is
  417. # forbidden, so we must make do with -shared. Unfortunately,
  418. # -shared by itself would get us global function descriptors
  419. # and calls through PLTs, dynamic resolution of symbols, etc,
  420. # which would break as well, but -Bsymbolic comes to the rescue.
  421. CPU_LDFLAGS-y += -Wl,-melf32frvfd -Wl,-Bsymbolic
  422. endif
  423. ifeq ($(strip $(TARGET_ARCH)),avr32)
  424. CPU_CFLAGS-$(CONFIG_AVR32_AP7) += -march=ap
  425. CPU_CFLAGS-$(CONFIG_LINKRELAX) += -mrelax
  426. CPU_LDFLAGS-$(CONFIG_LINKRELAX) += --relax
  427. endif
  428. ifeq ($(TARGET_ARCH),c6x)
  429. PIEFLAG:=
  430. CPU_CFLAGS-$(CONFIG_TMS320C64X) += -march=c64x
  431. CPU_CFLAGS-$(CONFIG_TMS320C64XPLUS) += -march=c64x+
  432. CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-mlittle-endian
  433. CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mbig-endian
  434. CPU_LDFLAGS-y += $(CPU_CFLAGS)
  435. endif
  436. ifeq ($(TARGET_ARCH),arc)
  437. CPU_CFLAGS-$(CONFIG_ARC_CPU_700) += -mA7
  438. CPU_CFLAGS-$(CONFIG_ARC_CPU_HS) += -mcpu=archs
  439. CPU_LDFLAGS-y += $(CPU_CFLAGS) -marclinux
  440. endif
  441. $(eval $(call check-gcc-var,$(PIEFLAG_NAME)))
  442. PIEFLAG := $(CFLAG_$(PIEFLAG_NAME))
  443. ifeq ($(PIEFLAG),)
  444. PIEFLAG := $(PICFLAG)
  445. endif
  446. # We need to keep track of both the CC PIE flag (above) as
  447. # well as the LD PIE flag (below) because we can't rely on
  448. # gcc passing -pie if we used -fPIE. We need to directly use -pie
  449. # instead of -Wl,-pie as gcc picks up the wrong startfile/endfile
  450. $(eval $(call cache-output-var,LDPIEFLAG,$(CC) -Wl$(comma)--help 2>/dev/null | grep -q -- -pie && echo "-pie"))
  451. # Check for --as-needed support in linker
  452. ifndef LD_FLAG_ASNEEDED
  453. _LD_FLAG_ASNEEDED:=$(shell $(CC) -Wl,--help 2>/dev/null | grep -- --as-needed)
  454. ifneq ($(_LD_FLAG_ASNEEDED),)
  455. export LD_FLAG_ASNEEDED:=--as-needed
  456. endif
  457. endif
  458. ifndef LD_FLAG_NO_ASNEEDED
  459. ifdef LD_FLAG_ASNEEDED
  460. export LD_FLAG_NO_ASNEEDED:=--no-as-needed
  461. endif
  462. endif
  463. ifndef CC_FLAG_ASNEEDED
  464. ifdef LD_FLAG_ASNEEDED
  465. export CC_FLAG_ASNEEDED:=-Wl,$(LD_FLAG_ASNEEDED)
  466. endif
  467. endif
  468. ifndef CC_FLAG_NO_ASNEEDED
  469. ifdef LD_FLAG_NO_ASNEEDED
  470. export CC_FLAG_NO_ASNEEDED:=-Wl,$(LD_FLAG_NO_ASNEEDED)
  471. endif
  472. endif
  473. link.asneeded = $(if $(CC_FLAG_ASNEEDED),$(if $(CC_FLAG_NO_ASNEEDED),$(CC_FLAG_ASNEEDED) $(1) $(CC_FLAG_NO_ASNEEDED)))
  474. # Check for AS_NEEDED support in linker script (binutils>=2.16.1 has it)
  475. ifndef ASNEEDED
  476. export ASNEEDED:=$(shell $(CC) -Wl,--help 2>/dev/null | grep -q -- --as-needed && echo "AS_NEEDED ( $(UCLIBC_LDSO) )" || echo "$(UCLIBC_LDSO)")
  477. endif
  478. # Add a bunch of extra pedantic annoyingly strict checks
  479. WARNING_FLAGS = -Wstrict-prototypes -Wstrict-aliasing
  480. ifeq ($(EXTRA_WARNINGS),y)
  481. WARNING_FLAGS += \
  482. -Wformat=2 \
  483. -Wmissing-noreturn \
  484. -Wmissing-format-attribute \
  485. -Wmissing-prototypes \
  486. -Wmissing-declarations \
  487. -Wnested-externs \
  488. -Wnonnull \
  489. -Wold-style-declaration \
  490. -Wold-style-definition \
  491. -Wdeclaration-after-statement \
  492. -Wshadow \
  493. -Wundef
  494. endif
  495. WARNING_FLAGS += $(WARNING_FLAGS-gcc-$(GCC_MAJOR_VER))
  496. $(foreach w,$(WARNING_FLAGS),$(eval $(call check-gcc-var,$(w))))
  497. XWARNINGS = $(call qstrip,$(WARNINGS)) $(foreach w,$(WARNING_FLAGS),$(CFLAG_$(w)))
  498. CPU_CFLAGS=$(call qstrip,$(CPU_CFLAGS-y))
  499. # Save the tested flag in a single variable and force it to be
  500. # evaluated just once. Then use that computed value.
  501. $(eval $(call check-gcc-var,-fno-stack-protector))
  502. SSP_DISABLE_FLAGS ?= $(CFLAG_-fno-stack-protector)
  503. ifeq ($(UCLIBC_BUILD_SSP),y)
  504. $(eval $(call check-gcc-var,-fno-stack-protector-all))
  505. $(eval $(call check-gcc-var,-fstack-protector))
  506. $(eval $(call check-gcc-var,-fstack-protector-all))
  507. SSP_CFLAGS := $(CFLAG_-fno-stack-protector-all)
  508. SSP_CFLAGS += $(CFLAG_-fstack-protector)
  509. SSP_ALL_CFLAGS ?= $(CFLAG_-fstack-protector-all)
  510. else
  511. SSP_CFLAGS := $(SSP_DISABLE_FLAGS)
  512. endif
  513. # Collect all CFLAGS components
  514. CFLAGS := $(XWARNINGS) $(CPU_CFLAGS) $(SSP_CFLAGS) \
  515. -nostdinc -I$(top_builddir)include \
  516. -I$(top_srcdir)include -include libc-symbols.h \
  517. -I$(top_srcdir)libc/sysdeps/linux/$(TARGET_ARCH) \
  518. -I$(top_srcdir)libc/sysdeps/linux \
  519. -I$(top_srcdir)ldso/ldso/$(TARGET_ARCH) \
  520. -I$(top_srcdir)ldso/include -I.
  521. # We need this to be checked within libc-symbols.h
  522. ifneq ($(HAVE_SHARED),y)
  523. CFLAGS += -DSTATIC
  524. endif
  525. $(eval $(call check-ld-var,--warn-once))
  526. $(eval $(call check-ld-var,--sort-common))
  527. $(eval $(call check-ld-var,--discard-all))
  528. LDFLAGS_NOSTRIP:=$(LDFLAG-fuse-ld) $(CPU_LDFLAGS-y) -shared \
  529. -Wl,--warn-common $(CFLAG_-Wl--warn-once) -Wl,-z,combreloc
  530. ifeq ($(UCLIBC_BUILD_RELRO),y)
  531. LDFLAGS_NOSTRIP+=-Wl,-z,relro
  532. endif
  533. ifeq ($(UCLIBC_BUILD_NOW),y)
  534. LDFLAGS_NOSTRIP+=-Wl,-z,now
  535. endif
  536. ifeq ($(LDSO_GNU_HASH_SUPPORT),y)
  537. # Be sure that binutils support it
  538. $(eval $(call check-ld-var,--hash-style=gnu))
  539. ifeq ($(LDFLAG_--hash-style=gnu),)
  540. ifneq ($(filter-out $(clean_targets) CLEAN_% install_headers headers-y,$(MAKECMDGOALS)),)
  541. $(error Your binutils do not support --hash-style option, while you want to use it)
  542. endif
  543. else
  544. LDFLAGS_NOSTRIP += $(CFLAG_-Wl--hash-style=gnu)
  545. endif
  546. endif
  547. ifeq ($(DODEBUG),y)
  548. CFLAGS += -O0 -g3 -DDEBUG
  549. else
  550. CFLAGS += $(OPTIMIZATION)
  551. CFLAGS += $(OPTIMIZATION-$(GCC_MAJOR_VER))
  552. CFLAGS += $(OPTIMIZATION-$(GCC_MAJOR_VER).$(GCC_MINOR_VER))
  553. $(eval $(call check-ld-var,-O2))
  554. LDFLAGS_NOSTRIP += $(CFLAG_-Wl-O2)
  555. endif
  556. LDFLAGS:=$(LDFLAGS_NOSTRIP) -Wl,-z,defs
  557. ifeq ($(DOSTRIP),y)
  558. LDFLAGS += -Wl,-s
  559. else
  560. STRIPTOOL := true -Stripping_disabled
  561. endif
  562. ifneq ($(strip $(UCLIBC_EXTRA_CFLAGS)),"")
  563. CFLAGS += $(call qstrip,$(UCLIBC_EXTRA_CFLAGS))
  564. endif
  565. ifneq ($(strip $(UCLIBC_EXTRA_LDFLAGS)),"")
  566. LDFLAGS += $(call qstrip,$(UCLIBC_EXTRA_LDFLAGS))
  567. endif
  568. ifeq ($(UCLIBC_HAS_STDIO_FUTEXES),y)
  569. CFLAGS += -D__USE_STDIO_FUTEXES__
  570. endif
  571. ifeq ($(UCLIBC_HAS_THREADS),y)
  572. ifeq ($(UCLIBC_HAS_THREADS_NATIVE),y)
  573. PTNAME := nptl
  574. CFLAGS += -DHAVE_FORCED_UNWIND -D_LIBC_REENTRANT
  575. else
  576. ifeq ($(UCLIBC_HAS_LINUXTHREADS),y)
  577. PTNAME := linuxthreads
  578. endif
  579. endif
  580. PTDIR := libpthread/$(PTNAME)
  581. # set up system dependencies include dirs (NOTE: order matters!)
  582. ifeq ($(UCLIBC_HAS_THREADS_NATIVE),y)
  583. PTINC:= -I$(top_builddir)$(PTDIR) \
  584. -I$(top_srcdir)$(PTDIR) \
  585. $(if $(TARGET_SUBARCH),-I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH)/$(TARGET_SUBARCH)) \
  586. -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH) \
  587. -I$(top_builddir)$(PTDIR)/sysdeps/$(TARGET_ARCH) \
  588. -I$(top_srcdir)$(PTDIR)/sysdeps/$(TARGET_ARCH) \
  589. -I$(top_builddir)$(PTDIR)/sysdeps/unix/sysv/linux \
  590. -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux \
  591. -I$(top_srcdir)$(PTDIR)/sysdeps/pthread \
  592. -I$(top_srcdir)$(PTDIR)/sysdeps/pthread/bits \
  593. -I$(top_srcdir)$(PTDIR)/sysdeps/generic
  594. #
  595. # Test for TLS if NPTL support was selected.
  596. #
  597. GCC_HAS_TLS=$(shell \
  598. echo "extern __thread int foo;" | $(CC) -o /dev/null -S -xc - 2>&1)
  599. ifneq ($(GCC_HAS_TLS),)
  600. gcc_tls_test_fail:
  601. @echo "####";
  602. @echo "#### Your compiler does not support TLS and you are trying to build uClibc";
  603. @echo "#### with NPTL support. Upgrade your binutils and gcc to versions which";
  604. @echo "#### support TLS for your architecture. Do not contact uClibc maintainers";
  605. @echo "#### about this problem.";
  606. @echo "####";
  607. @echo "#### Exiting...";
  608. @echo "####";
  609. @exit 1;
  610. endif
  611. else
  612. PTINC := \
  613. -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH) \
  614. -I$(top_srcdir)$(PTDIR)/sysdeps/$(TARGET_ARCH) \
  615. -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux \
  616. -I$(top_srcdir)$(PTDIR)/sysdeps/pthread \
  617. -I$(top_srcdir)$(PTDIR) \
  618. -I$(top_srcdir)libpthread
  619. endif
  620. CFLAGS+=$(PTINC)
  621. else
  622. PTNAME :=
  623. PTINC :=
  624. endif
  625. CFLAGS += -I$(top_srcdir)libc/sysdeps/linux/common
  626. #CFLAGS += -iwithprefix include-fixed -iwithprefix include
  627. $(eval $(call cache-output-var,CC_IPREFIX,$(CC) -print-file-name=include))
  628. CC_INC := -isystem $(dir $(CC_IPREFIX))include-fixed -isystem $(CC_IPREFIX)
  629. CFLAGS += $(CC_INC)
  630. CFLAGS += -I$(KERNEL_HEADERS)
  631. ifneq ($(DOASSERTS),y)
  632. CFLAGS+=-DNDEBUG
  633. endif
  634. ifeq ($(SYMBOL_PREFIX),_)
  635. CFLAGS+=-D__UCLIBC_UNDERSCORES__
  636. endif
  637. # Keep the check_as from being needlessly executed
  638. ifeq ($(UCLIBC_BUILD_NOEXECSTACK),y)
  639. $(eval $(call check-as-var,--noexecstack))
  640. endif
  641. ASFLAGS += $(ASFLAG_--noexecstack)
  642. LIBGCC_CFLAGS ?= $(CFLAGS) $(CPU_CFLAGS-y)
  643. $(eval $(call cache-output-var,LIBGCC_A,$(CC) $(LIBGCC_CFLAGS) -print-libgcc-file-name))
  644. $(eval $(call cache-output-var,LIBGCC_EH,$(CC) $(LIBGCC_CFLAGS) -print-file-name=libgcc_eh.a))
  645. # with -O0 we (e.g. lockf) might end up with references to
  646. # _Unwind_Resume, so pull in gcc_eh in this case..
  647. # with a --disable-shared toolchain, libgcc_eh.a and libgcc.a are combined
  648. # in libgcc.a, so check if the printed file exist, before adding to the commandline
  649. LIBGCC_EH_FILE := $(shell if [ -f $(LIBGCC_EH) ]; then echo $(LIBGCC_EH); fi)
  650. LIBGCC_DIR := $(dir $(LIBGCC_A))
  651. LIBGCC := $(LIBGCC_A) $(if $(DODEBUG),$(LIBGCC_EH_FILE))
  652. # moved from libpthread/linuxthreads
  653. ifeq ($(UCLIBC_CTOR_DTOR),y)
  654. SHARED_START_FILES:=$(top_builddir)lib/crti.o $(LIBGCC_DIR)crtbeginS.o
  655. SHARED_END_FILES:=$(LIBGCC_DIR)crtendS.o $(top_builddir)lib/crtn.o
  656. endif
  657. LOCAL_INSTALL_PATH := $(if $(O),$(O)/)install_dir
  658. PTHREAD_GENERATE_MANGLE ?= -n "s/^.*@@@name@@@\([^@]*\)@@@value@@@[^0-9Xxa-fA-F-]*\([0-9Xxa-fA-F-][0-9Xxa-fA-F-]*\).*@@@end@@@.*\$$/\#define \1 \2/p"