Rules.mak 26 KB

123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321322323324325326327328329330331332333334335336337338339340341342343344345346347348349350351352353354355356357358359360361362363364365366367368369370371372373374375376377378379380381382383384385386387388389390391392393394395396397398399400401402403404405406407408409410411412413414415416417418419420421422423424425426427428429430431432433434435436437438439440441442443444445446447448449450451452453454455456457458459460461462463464465466467468469470471472473474475476477478479480481482483484485486487488489490491492493494495496497498499500501502503504505506507508509510511512513514515516517518519520521522523524525526527528529530531532533534535536537538539540541542543544545546547548549550551552553554555556557558559560561562563564565566567568569570571572573574575576577578579580581582583584585586587588589590591592593594595596597598599600601602603604605606607608609610611612613614615616617618619620621622623624625626627628629630631632633634635636637638639640641642643644645646647648649650651652653654655656657658659660661662663664665666667668669670671672673674675676677678679680681682683684685686687688689690691692693694695696697698699700701702703704705706707708709710711712713714715716717718719720721722723724725726727728729730731732733734735736737738739740741742743744745746747748749750751752753754755756757758759760761762763764765766767768769770771772773774775776777778779780781782783784785786787788789790791792793794795796797
  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 := 13
  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. $(eval $(call check-gcc-var,-fdata-sections))
  284. $(eval $(call check-gcc-var,-ffunction-sections))
  285. # Some nice CPU specific optimizations
  286. ifeq ($(TARGET_ARCH),i386)
  287. $(eval $(call check-gcc-var,-fomit-frame-pointer))
  288. OPTIMIZATION += $(CFLAG_-fomit-frame-pointer)
  289. ifeq ($(CONFIG_386)$(CONFIG_486)$(CONFIG_586),y)
  290. # TODO: Change this to a gcc version check. This bug
  291. # should be fixed with at least gcc-4.3.
  292. # Non-SSE capable processor.
  293. # NB: this may make SSE insns segfault!
  294. # -O1 -march=pentium3, -Os -msse etc are known to be affected.
  295. # See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13685
  296. # -m32 is needed if host is 64-bit
  297. OPTIMIZATION+=$(call check_gcc,-m32 -mpreferred-stack-boundary=2,)
  298. else
  299. $(eval $(call check-gcc-var,-mpreferred-stack-boundary=4))
  300. OPTIMIZATION += $(CFLAG_-mpreferred-stack-boundary=4)
  301. endif
  302. # Choice of alignment (please document why!)
  303. # -falign-labels: in-line labels
  304. # (reachable by normal code flow, aligning will insert nops
  305. # which will be executed - may even make things slower)
  306. # -falign-jumps: reachable only by a jump
  307. # Generic: no alignment at all (smallest code)
  308. GCC_FALIGN=$(call check_gcc,-falign-functions=1 -falign-jumps=1 -falign-labels=1 -falign-loops=1,-malign-jumps=1 -malign-loops=1)
  309. OPTIMIZATION+=$(GCC_FALIGN)
  310. # Putting each function and data object into its own section
  311. # allows for kbytes of less text if users link against static uclibc
  312. # using ld --gc-sections.
  313. # ld 2.18 can't do that (yet?) for shared libraries, so we itself
  314. # do not use --gc-sections at shared lib link time.
  315. # However, in combination with sections being sorted by alignment
  316. # it does result in much reduced padding:
  317. # text data bss dec hex
  318. # 235319 1472 5992 242783 3b45f old.so
  319. # 234104 1472 5980 241556 3af94 new.so
  320. # Without -ffunction-sections, all functions will get aligned
  321. # to 4 byte boundary by as/ld. This is arguably a bug in as.
  322. # It specifies 4 byte align for .text even if not told to do so:
  323. # Idx Name Size VMA LMA File off Algn
  324. # 0 .text xxxxxxxx 00000000 00000000 xxxxxxxx 2**2 <===!
  325. CPU_CFLAGS-y += $(CFLAG_-ffunction-sections) $(CFLAG_-fdata-sections)
  326. CPU_LDFLAGS-y += $(CFLAG_-Wl--sort-common)
  327. $(eval $(call check-ld-var,--sort-section=alignment))
  328. CPU_LDFLAGS-y += $(CFLAG_-Wl--sort-section=alignment)
  329. CPU_LDFLAGS-y+=-m32
  330. CPU_CFLAGS-y+=-m32
  331. endif
  332. ifeq ($(TARGET_ARCH),sparc)
  333. CPU_CFLAGS-$(CONFIG_SPARC_V7)+=-mcpu=v7
  334. CPU_CFLAGS-$(CONFIG_SPARC_V8)+=-mcpu=v8
  335. CPU_CFLAGS-$(CONFIG_SPARC_V9)+=-mcpu=v9
  336. CPU_CFLAGS-$(CONFIG_SPARC_V9B)+=$(call check_gcc,-mcpu=v9b,-mcpu=ultrasparc)
  337. endif
  338. ifeq ($(TARGET_ARCH),arm)
  339. CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-mlittle-endian
  340. CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mbig-endian
  341. endif
  342. ifeq ($(TARGET_ARCH),metag)
  343. SYMBOL_PREFIX=_
  344. CPU_CFLAGS-$(CONFIG_META_1_2)+=
  345. CPU_CFLAGS-$(CONFIG_META_2_1)+=-Wa,-mcpu=metac21
  346. endif
  347. ifeq ($(TARGET_ARCH),mips)
  348. OPTIMIZATION+=-mno-split-addresses
  349. CPU_CFLAGS-$(CONFIG_MIPS_N64_ABI)+=-mabi=64
  350. CPU_CFLAGS-$(CONFIG_MIPS_O32_ABI)+=-mabi=32
  351. CPU_CFLAGS-$(CONFIG_MIPS_N32_ABI)+=-mabi=n32
  352. CPU_LDFLAGS-y += $(CPU_CFLAGS)
  353. endif
  354. ifeq ($(TARGET_ARCH),sh)
  355. $(eval $(call check-gcc-var,-mprefergot))
  356. OPTIMIZATION += $(CFLAG_-mprefergot)
  357. CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-ml
  358. CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mb
  359. CPU_CFLAGS-$(CONFIG_SH2)+=-m2
  360. CPU_CFLAGS-$(CONFIG_SH3)+=-m3
  361. ifeq ($(UCLIBC_HAS_FPU),y)
  362. CPU_CFLAGS-$(CONFIG_SH2A)+=-m2a
  363. CPU_CFLAGS-$(CONFIG_SH4)+=-m4
  364. CPU_CFLAGS-$(CONFIG_SH4A)+=-m4a
  365. else
  366. CPU_CFLAGS-$(CONFIG_SH2A)+=-m2a-nofpu
  367. CPU_CFLAGS-$(CONFIG_SH4)+=-m4-nofpu
  368. CPU_CFLAGS-$(CONFIG_SH4A)+=-m4a-nofpu
  369. endif
  370. endif
  371. ifeq ($(TARGET_ARCH),h8300)
  372. CPU_CFLAGS-$(CONFIG_H8300H) += -mh -mint32
  373. CPU_CFLAGS-$(CONFIG_H8S) += -ms -mint32
  374. endif
  375. ifeq ($(TARGET_ARCH),cris)
  376. CPU_LDFLAGS-$(CONFIG_CRIS)+=-Wl,-mcrislinux
  377. CPU_LDFLAGS-$(CONFIG_CRISV32)+=-Wl,-mcrislinux
  378. CPU_CFLAGS-$(CONFIG_CRIS)+=-mlinux
  379. PICFLAG:=-fpic
  380. PIEFLAG_NAME:=-fpie
  381. endif
  382. ifeq ($(TARGET_ARCH),m68k)
  383. # -fPIC is only supported for 68020 and above. It is not supported
  384. # for 68000, 68010, or Coldfire.
  385. PICFLAG:=-fpic
  386. PIEFLAG_NAME:=-fpie
  387. endif
  388. ifeq ($(TARGET_ARCH),powerpc)
  389. # PowerPC can hold 8192 entries in its GOT with -fpic which is more than
  390. # enough. Therefore use -fpic which will reduce code size and generates
  391. # faster code.
  392. PICFLAG:=-fpic
  393. PIEFLAG_NAME:=-fpie
  394. PPC_HAS_REL16:=$(shell echo -e "\t.text\n\taddis 11,30,_GLOBAL_OFFSET_TABLE_-.@ha" | $(CC) -c -x assembler -o /dev/null - 2> /dev/null && echo -n y || echo -n n)
  395. CPU_CFLAGS-$(PPC_HAS_REL16)+= -DHAVE_ASM_PPC_REL16
  396. CPU_CFLAGS-$(CONFIG_E500) += "-D__NO_MATH_INLINES"
  397. endif
  398. ifeq ($(TARGET_ARCH),bfin)
  399. SYMBOL_PREFIX=_
  400. ifeq ($(UCLIBC_FORMAT_FDPIC_ELF),y)
  401. CPU_CFLAGS-y:=-mfdpic
  402. CPU_LDFLAGS-y += -Wl,-melf32bfinfd
  403. PICFLAG:=-fpic
  404. PIEFLAG_NAME:=-fpie
  405. endif
  406. ifeq ($(UCLIBC_FORMAT_SHARED_FLAT),y)
  407. PICFLAG := -mleaf-id-shared-library
  408. endif
  409. endif
  410. ifeq ($(TARGET_ARCH),frv)
  411. # Using -pie causes the program to have an interpreter, which is
  412. # forbidden, so we must make do with -shared. Unfortunately,
  413. # -shared by itself would get us global function descriptors
  414. # and calls through PLTs, dynamic resolution of symbols, etc,
  415. # which would break as well, but -Bsymbolic comes to the rescue.
  416. CPU_LDFLAGS-y += -Wl,-melf32frvfd -Wl,-Bsymbolic
  417. endif
  418. ifeq ($(strip $(TARGET_ARCH)),avr32)
  419. CPU_CFLAGS-$(CONFIG_AVR32_AP7) += -march=ap
  420. CPU_CFLAGS-$(CONFIG_LINKRELAX) += -mrelax
  421. CPU_LDFLAGS-$(CONFIG_LINKRELAX) += --relax
  422. endif
  423. ifeq ($(TARGET_ARCH),c6x)
  424. PIEFLAG:=
  425. CPU_CFLAGS-$(CONFIG_TMS320C64X) += -march=c64x
  426. CPU_CFLAGS-$(CONFIG_TMS320C64XPLUS) += -march=c64x+
  427. CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-mlittle-endian
  428. CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mbig-endian
  429. CPU_LDFLAGS-y += $(CPU_CFLAGS)
  430. endif
  431. ifeq ($(TARGET_ARCH),arc)
  432. CPU_CFLAGS-y += -mlock -mswape
  433. CPU_CFLAGS-$(CONFIG_ARC_CPU_700) += -mA7
  434. CPU_CFLAGS-$(CONFIG_ARC_CPU_HS) += -mcpu=archs
  435. CPU_LDFLAGS-y += $(CPU_CFLAGS) -marclinux
  436. endif
  437. $(eval $(call check-gcc-var,$(PIEFLAG_NAME)))
  438. PIEFLAG := $(CFLAG_$(PIEFLAG_NAME))
  439. ifeq ($(PIEFLAG),)
  440. PIEFLAG := $(PICFLAG)
  441. endif
  442. # We need to keep track of both the CC PIE flag (above) as
  443. # well as the LD PIE flag (below) because we can't rely on
  444. # gcc passing -pie if we used -fPIE. We need to directly use -pie
  445. # instead of -Wl,-pie as gcc picks up the wrong startfile/endfile
  446. $(eval $(call cache-output-var,LDPIEFLAG,$(CC) -Wl$(comma)--help 2>/dev/null | grep -q -- -pie && echo "-pie"))
  447. # Check for --as-needed support in linker
  448. ifndef LD_FLAG_ASNEEDED
  449. _LD_FLAG_ASNEEDED:=$(shell $(CC) -Wl,--help 2>/dev/null | grep -- --as-needed)
  450. ifneq ($(_LD_FLAG_ASNEEDED),)
  451. export LD_FLAG_ASNEEDED:=--as-needed
  452. endif
  453. endif
  454. ifndef LD_FLAG_NO_ASNEEDED
  455. ifdef LD_FLAG_ASNEEDED
  456. export LD_FLAG_NO_ASNEEDED:=--no-as-needed
  457. endif
  458. endif
  459. ifndef CC_FLAG_ASNEEDED
  460. ifdef LD_FLAG_ASNEEDED
  461. export CC_FLAG_ASNEEDED:=-Wl,$(LD_FLAG_ASNEEDED)
  462. endif
  463. endif
  464. ifndef CC_FLAG_NO_ASNEEDED
  465. ifdef LD_FLAG_NO_ASNEEDED
  466. export CC_FLAG_NO_ASNEEDED:=-Wl,$(LD_FLAG_NO_ASNEEDED)
  467. endif
  468. endif
  469. link.asneeded = $(if $(findstring yy,$(CC_FLAG_ASNEEDED)$(CC_FLAG_NO_ASNEEDED)),$(CC_FLAG_ASNEEDED) $(1) $(CC_FLAG_NO_ASNEEDED))
  470. # Check for AS_NEEDED support in linker script (binutils>=2.16.1 has it)
  471. ifndef ASNEEDED
  472. export ASNEEDED:=$(shell $(CC) -Wl,--help 2>/dev/null | grep -q -- --as-needed && echo "AS_NEEDED ( $(UCLIBC_LDSO) )" || echo "$(UCLIBC_LDSO)")
  473. # Only used in installed libc.so linker script
  474. ifeq ($(UCLIBC_HAS_BACKTRACE),y)
  475. ifeq ($(HARDWIRED_ABSPATH),y)
  476. UBACKTRACE_FULL_NAME := $(subst //,/,$(RUNTIME_PREFIX)$(MULTILIB_DIR)/$(UBACKTRACE_DSO))
  477. else
  478. UBACKTRACE_FULL_NAME := $(UBACKTRACE_DSO)
  479. endif
  480. export UBACKTRACE_ASNEEDED:=$(shell $(CC) -Wl,--help 2>/dev/null | grep -q -- --as-needed && \
  481. echo "GROUP ( AS_NEEDED ( $(UBACKTRACE_FULL_NAME) ) )" || \
  482. echo "GROUP ( $(UBACKTRACE_FULL_NAME) )")
  483. else
  484. export UBACKTRACE_ASNEEDED:=""
  485. endif
  486. ifeq ($(UCLIBC_HAS_ARGP),y)
  487. ifeq ($(HARDWIRED_ABSPATH),y)
  488. # Only used in installed libc.so linker script
  489. UARGP_FULL_NAME := $(subst //,/,$(RUNTIME_PREFIX)$(MULTILIB_DIR)/libuargp.so.$(MAJOR_VERSION))
  490. else
  491. UARGP_FULL_NAME := libuargp.so.$(MAJOR_VERSION)
  492. endif
  493. export UARGP_ASNEEDED:=$(shell $(CC) -Wl,--help 2>/dev/null | grep -q -- --as-needed && \
  494. echo "GROUP ( AS_NEEDED ( $(UARGP_FULL_NAME) ) )" || \
  495. echo "GROUP ( $(UARGP_FULL_NAME) )")
  496. else
  497. export UARGP_ASNEEDED:=""
  498. endif
  499. endif
  500. # Add a bunch of extra pedantic annoyingly strict checks
  501. WARNING_FLAGS = -Wstrict-prototypes -Wstrict-aliasing
  502. ifeq ($(EXTRA_WARNINGS),y)
  503. WARNING_FLAGS += \
  504. -Wformat=2 \
  505. -Wmissing-noreturn \
  506. -Wmissing-format-attribute \
  507. -Wmissing-prototypes \
  508. -Wmissing-declarations \
  509. -Wnested-externs \
  510. -Wnonnull \
  511. -Wold-style-declaration \
  512. -Wold-style-definition \
  513. -Wshadow \
  514. -Wundef
  515. # Works only w/ gcc-3.4 and up, can't be checked for gcc-3.x w/ check_gcc()
  516. #WARNING_FLAGS-gcc-4 += -Wdeclaration-after-statement
  517. endif
  518. WARNING_FLAGS += $(WARNING_FLAGS-gcc-$(GCC_MAJOR_VER))
  519. $(foreach w,$(WARNING_FLAGS),$(eval $(call check-gcc-var,$(w))))
  520. XWARNINGS = $(call qstrip,$(WARNINGS)) $(foreach w,$(WARNING_FLAGS),$(CFLAG_$(w)))
  521. CPU_CFLAGS=$(call qstrip,$(CPU_CFLAGS-y))
  522. # Save the tested flag in a single variable and force it to be
  523. # evaluated just once. Then use that computed value.
  524. $(eval $(call check-gcc-var,-fno-stack-protector))
  525. SSP_DISABLE_FLAGS ?= $(CFLAG_-fno-stack-protector)
  526. ifeq ($(UCLIBC_BUILD_SSP),y)
  527. $(eval $(call check-gcc-var,-fno-stack-protector-all))
  528. $(eval $(call check-gcc-var,-fstack-protector))
  529. $(eval $(call check-gcc-var,-fstack-protector-all))
  530. SSP_CFLAGS := $(CFLAG_-fno-stack-protector-all)
  531. SSP_CFLAGS += $(CFLAG_-fstack-protector)
  532. SSP_ALL_CFLAGS ?= $(CFLAG_-fstack-protector-all)
  533. else
  534. SSP_CFLAGS := $(SSP_DISABLE_FLAGS)
  535. endif
  536. # Collect all CFLAGS components
  537. CFLAGS := $(XWARNINGS) $(CPU_CFLAGS) $(SSP_CFLAGS) \
  538. -nostdinc -I$(top_builddir)include \
  539. -I$(top_srcdir)include -include libc-symbols.h \
  540. -I$(top_srcdir)libc/sysdeps/linux/$(TARGET_ARCH) \
  541. -I$(top_srcdir)libc/sysdeps/linux \
  542. -I$(top_srcdir)ldso/ldso/$(TARGET_ARCH) \
  543. -I$(top_srcdir)ldso/include -I.
  544. # We need this to be checked within libc-symbols.h
  545. ifneq ($(HAVE_SHARED),y)
  546. CFLAGS += -DSTATIC
  547. endif
  548. $(eval $(call check-ld-var,--warn-once))
  549. $(eval $(call check-ld-var,--sort-common))
  550. $(eval $(call check-ld-var,--discard-all))
  551. LDFLAGS_NOSTRIP:=$(LDFLAG-fuse-ld) $(CPU_LDFLAGS-y) -shared \
  552. -Wl,--warn-common $(CFLAG_-Wl--warn-once) -Wl,-z,combreloc
  553. # binutils-2.16.1 warns about ignored sections, 2.16.91.0.3 and newer are ok
  554. #$(eval $(call check-ld-var,--gc-sections))
  555. #LDFLAGS_NOSTRIP += $(LDFLAG_--gc-sections)
  556. ifeq ($(UCLIBC_BUILD_RELRO),y)
  557. LDFLAGS_NOSTRIP+=-Wl,-z,relro
  558. endif
  559. ifeq ($(UCLIBC_BUILD_NOW),y)
  560. LDFLAGS_NOSTRIP+=-Wl,-z,now
  561. endif
  562. ifeq ($(LDSO_GNU_HASH_SUPPORT),y)
  563. # Be sure that binutils support it
  564. $(eval $(call check-ld-var,--hash-style=gnu))
  565. ifeq ($(LDFLAG_--hash-style=gnu),)
  566. ifneq ($(filter-out $(clean_targets) CLEAN_% install_headers headers-y,$(MAKECMDGOALS)),)
  567. $(error Your binutils do not support --hash-style option, while you want to use it)
  568. endif
  569. else
  570. LDFLAGS_NOSTRIP += $(CFLAG_-Wl--hash-style=gnu)
  571. endif
  572. endif
  573. ifeq ($(DODEBUG),y)
  574. CFLAGS += -O0 -g3 -DDEBUG
  575. else
  576. CFLAGS += $(OPTIMIZATION)
  577. CFLAGS += $(OPTIMIZATION-$(GCC_MAJOR_VER))
  578. CFLAGS += $(OPTIMIZATION-$(GCC_MAJOR_VER).$(GCC_MINOR_VER))
  579. $(eval $(call check-ld-var,-O2))
  580. LDFLAGS_NOSTRIP += $(CFLAG_-Wl-O2)
  581. endif
  582. LDFLAGS:=$(LDFLAGS_NOSTRIP) -Wl,-z,defs
  583. ifeq ($(DOSTRIP),y)
  584. LDFLAGS += -Wl,-s
  585. else
  586. STRIPTOOL := true -Stripping_disabled
  587. endif
  588. ifeq ($(DOMULTI),y)
  589. # we try to compile all sources at once into an object (IMA), but
  590. # gcc-3.3.x does not support it
  591. # gcc-3.4.x supports it, but does not need and support --combine. though fails on many sources
  592. # gcc-4.0.x supports it, supports the --combine flag, but does not need it
  593. # gcc-4.1(200506xx) supports it, but needs the --combine flag, else libs are useless
  594. ifeq ($(GCC_MAJOR_VER),3)
  595. DOMULTI:=n
  596. else
  597. $(eval $(call check-gcc-var,--combine))
  598. CFLAGS += $(CFLAG_--combine)
  599. endif
  600. else
  601. DOMULTI:=n
  602. endif
  603. ifneq ($(strip $(UCLIBC_EXTRA_CFLAGS)),"")
  604. CFLAGS += $(call qstrip,$(UCLIBC_EXTRA_CFLAGS))
  605. endif
  606. ifneq ($(strip $(UCLIBC_EXTRA_LDFLAGS)),"")
  607. LDFLAGS += $(call qstrip,$(UCLIBC_EXTRA_LDFLAGS))
  608. endif
  609. ifeq ($(UCLIBC_HAS_STDIO_FUTEXES),y)
  610. CFLAGS += -D__USE_STDIO_FUTEXES__
  611. endif
  612. ifeq ($(UCLIBC_HAS_THREADS),y)
  613. ifeq ($(UCLIBC_HAS_THREADS_NATIVE),y)
  614. PTNAME := nptl
  615. CFLAGS += -DHAVE_FORCED_UNWIND -D_LIBC_REENTRANT
  616. else
  617. ifeq ($(LINUXTHREADS_OLD),y)
  618. PTNAME := linuxthreads.old
  619. else
  620. PTNAME := linuxthreads
  621. endif
  622. endif
  623. PTDIR := libpthread/$(PTNAME)
  624. # set up system dependencies include dirs (NOTE: order matters!)
  625. ifeq ($(UCLIBC_HAS_THREADS_NATIVE),y)
  626. PTINC:= -I$(top_builddir)$(PTDIR) \
  627. -I$(top_srcdir)$(PTDIR) \
  628. $(if $(TARGET_SUBARCH),-I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH)/$(TARGET_SUBARCH)) \
  629. -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH) \
  630. -I$(top_builddir)$(PTDIR)/sysdeps/$(TARGET_ARCH) \
  631. -I$(top_srcdir)$(PTDIR)/sysdeps/$(TARGET_ARCH) \
  632. -I$(top_builddir)$(PTDIR)/sysdeps/unix/sysv/linux \
  633. -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux \
  634. -I$(top_srcdir)$(PTDIR)/sysdeps/pthread \
  635. -I$(top_srcdir)$(PTDIR)/sysdeps/pthread/bits \
  636. -I$(top_srcdir)$(PTDIR)/sysdeps/generic
  637. #
  638. # Test for TLS if NPTL support was selected.
  639. #
  640. GCC_HAS_TLS=$(shell \
  641. echo "extern __thread int foo;" | $(CC) -o /dev/null -S -xc - 2>&1)
  642. ifneq ($(GCC_HAS_TLS),)
  643. gcc_tls_test_fail:
  644. @echo "####";
  645. @echo "#### Your compiler does not support TLS and you are trying to build uClibc";
  646. @echo "#### with NPTL support. Upgrade your binutils and gcc to versions which";
  647. @echo "#### support TLS for your architecture. Do not contact uClibc maintainers";
  648. @echo "#### about this problem.";
  649. @echo "####";
  650. @echo "#### Exiting...";
  651. @echo "####";
  652. @exit 1;
  653. endif
  654. else
  655. PTINC := \
  656. -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH) \
  657. -I$(top_srcdir)$(PTDIR)/sysdeps/$(TARGET_ARCH) \
  658. -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux \
  659. -I$(top_srcdir)$(PTDIR)/sysdeps/pthread \
  660. -I$(top_srcdir)$(PTDIR) \
  661. -I$(top_srcdir)libpthread
  662. endif
  663. CFLAGS+=$(PTINC)
  664. else
  665. PTNAME :=
  666. PTINC :=
  667. endif
  668. CFLAGS += -I$(top_srcdir)libc/sysdeps/linux/common
  669. #CFLAGS += -iwithprefix include-fixed -iwithprefix include
  670. $(eval $(call cache-output-var,CC_IPREFIX,$(CC) -print-file-name=include))
  671. CC_INC := -isystem $(dir $(CC_IPREFIX))include-fixed -isystem $(CC_IPREFIX)
  672. CFLAGS += $(CC_INC)
  673. CFLAGS += -I$(KERNEL_HEADERS)
  674. ifneq ($(DOASSERTS),y)
  675. CFLAGS+=-DNDEBUG
  676. endif
  677. ifeq ($(SYMBOL_PREFIX),_)
  678. CFLAGS+=-D__UCLIBC_UNDERSCORES__
  679. endif
  680. # Keep the check_as from being needlessly executed
  681. ifeq ($(UCLIBC_BUILD_NOEXECSTACK),y)
  682. $(eval $(call check-as-var,--noexecstack))
  683. endif
  684. ASFLAGS += $(ASFLAG_--noexecstack)
  685. LIBGCC_CFLAGS ?= $(CFLAGS) $(CPU_CFLAGS-y)
  686. $(eval $(call cache-output-var,LIBGCC_A,$(CC) $(LIBGCC_CFLAGS) -print-libgcc-file-name))
  687. $(eval $(call cache-output-var,LIBGCC_EH,$(CC) $(LIBGCC_CFLAGS) -print-file-name=libgcc_eh.a))
  688. # with -O0 we (e.g. lockf) might end up with references to
  689. # _Unwind_Resume, so pull in gcc_eh in this case..
  690. # with a --disable-shared toolchain, libgcc_eh.a and libgcc.a are combined
  691. # in libgcc.a, so check if the printed file exist, before adding to the commandline
  692. LIBGCC_EH_FILE := $(shell if [ -f $(LIBGCC_EH) ]; then echo $(LIBGCC_EH); fi)
  693. LIBGCC_DIR := $(dir $(LIBGCC_A))
  694. LIBGCC := $(LIBGCC_A) $(if $(DODEBUG),$(LIBGCC_EH_FILE))
  695. # moved from libpthread/linuxthreads
  696. ifeq ($(UCLIBC_CTOR_DTOR),y)
  697. SHARED_START_FILES:=$(top_builddir)lib/crti.o $(LIBGCC_DIR)crtbeginS.o
  698. SHARED_END_FILES:=$(LIBGCC_DIR)crtendS.o $(top_builddir)lib/crtn.o
  699. endif
  700. LOCAL_INSTALL_PATH := $(if $(O),$(O)/)install_dir
  701. PTHREAD_GENERATE_MANGLE ?= -n "s/^.*@@@name@@@\([^@]*\)@@@value@@@[^0-9Xxa-fA-F-]*\([0-9Xxa-fA-F-][0-9Xxa-fA-F-]*\).*@@@end@@@.*\$$/\#define \1 \2/p"