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 oldconfig silentoldconfig randconfig \
  28. defconfig allyesconfig allnoconfig \
  29. xconfig gconfig update-po-config mconf qconf gconf conf \
  30. release dist tags help
  31. #-----------------------------------------------------------
  32. # If you are running a cross compiler, you will want to set
  33. # 'CROSS_COMPILE' to something more interesting ... Target
  34. # architecture is determined by asking the CC compiler what
  35. # arch it compiles things for, so unless your compiler is
  36. # broken, you should not need to specify TARGET_ARCH.
  37. #
  38. # Most people will set this stuff on the command line, i.e.
  39. # make CROSS_COMPILE=arm-linux-
  40. # will build uClibc for 'arm'.
  41. # CROSS is still supported for backward compatibily only
  42. CROSS_COMPILE ?= $(CROSS)
  43. CC = $(CROSS_COMPILE)gcc
  44. AR = $(CROSS_COMPILE)ar
  45. LD = $(CROSS_COMPILE)ld
  46. NM = $(CROSS_COMPILE)nm
  47. OBJDUMP = $(CROSS_COMPILE)objdump
  48. STRIPTOOL = $(CROSS_COMPILE)strip
  49. INSTALL = install
  50. LN = ln
  51. RM = rm -f
  52. TAR = tar
  53. SED = sed
  54. AWK = awk
  55. STRIP_FLAGS ?= -x -R .note -R .comment
  56. ## unused? if yes, remove after 0.9.31
  57. ## UNIFDEF := $(top_builddir)extra/scripts/unifdef
  58. # Select the compiler needed to build binaries for your development system
  59. HOSTCC = gcc
  60. BUILD_CFLAGS = -Os -Wall
  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_CONFIG ?= $(top_builddir).config
  69. # Pull in the user's uClibc configuration
  70. ifeq ($(filter $(noconfig_targets) clean CLEAN_%,$(MAKECMDGOALS)),)
  71. # Prevent make from searching
  72. __ABS_KCONFIG_CONFIG ?= $(abspath $(KCONFIG_CONFIG))
  73. -include $(__ABS_KCONFIG_CONFIG)
  74. else
  75. # else we have to tell config where to write .config
  76. export KCONFIG_CONFIG
  77. endif
  78. ifeq ($(HAVE_DOT_CONFIG),y)
  79. # tell config where our .config lives
  80. export KCONFIG_CONFIG
  81. endif
  82. TARGET_ARCH:=$(call qstrip,$(TARGET_ARCH))
  83. ifeq ($(TARGET_ARCH),)
  84. ARCH ?= $(shell uname -m | $(SED) -e s/i.86/i386/ \
  85. -e s/sun.*/sparc/ -e s/sparc.*/sparc/ \
  86. -e s/arm.*/arm/ -e s/sa110/arm/ \
  87. -e s/sh.*/sh/ \
  88. -e s/s390x/s390/ -e s/parisc.*/hppa/ \
  89. -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
  90. -e s/xtensa.*/xtensa/ )
  91. else
  92. ARCH = $(TARGET_ARCH)
  93. endif
  94. export ARCH
  95. # Make certain these contain a final "/", but no "//"s.
  96. scrub_path = $(strip $(subst //,/, $(subst ,/, $(call qstrip,$(1)))))
  97. TARGET_SUBARCH := $(call qstrip,$(TARGET_SUBARCH))
  98. RUNTIME_PREFIX := $(call scrub_path,$(RUNTIME_PREFIX))
  99. DEVEL_PREFIX := $(call scrub_path,$(DEVEL_PREFIX))
  100. MULTILIB_DIR := $(call scrub_path,$(MULTILIB_DIR))
  101. KERNEL_HEADERS := $(call scrub_path,$(KERNEL_HEADERS))
  102. export RUNTIME_PREFIX DEVEL_PREFIX KERNEL_HEADERS MULTILIB_DIR
  103. # Now config hard core
  104. MAJOR_VERSION := 0
  105. MINOR_VERSION := 9
  106. SUBLEVEL := 34
  107. EXTRAVERSION :=-git
  108. VERSION := $(MAJOR_VERSION).$(MINOR_VERSION).$(SUBLEVEL)
  109. ABI_VERSION := $(MAJOR_VERSION)
  110. ifneq ($(EXTRAVERSION),)
  111. VERSION := $(VERSION)$(EXTRAVERSION)
  112. endif
  113. # Ensure consistent sort order, 'gcc -print-search-dirs' behavior, etc.
  114. LC_ALL := C
  115. export MAJOR_VERSION MINOR_VERSION SUBLEVEL VERSION ABI_VERSION LC_ALL
  116. LIBC := libc
  117. SHARED_LIBNAME := $(LIBC).so.$(ABI_VERSION)
  118. UBACKTRACE_DSO := libubacktrace.so.$(ABI_VERSION)
  119. UCLIBC_LDSO_NAME := ld-uClibc
  120. ARCH_NATIVE_BIT := 32
  121. ifneq ($(findstring $(TARGET_ARCH) , hppa64 ia64 powerpc64 s390x sparc64 x86_64 ),)
  122. UCLIBC_LDSO_NAME := ld64-uClibc
  123. ARCH_NATIVE_BIT := 64
  124. else
  125. ifeq ($(CONFIG_MIPS_N64_ABI),y)
  126. UCLIBC_LDSO_NAME := ld64-uClibc
  127. ARCH_NATIVE_BIT := 64
  128. endif
  129. endif
  130. UCLIBC_LDSO := $(UCLIBC_LDSO_NAME).so.$(ABI_VERSION)
  131. NONSHARED_LIBNAME := uclibc_nonshared.a
  132. libc := $(top_builddir)lib/$(SHARED_LIBNAME)
  133. libc.depend := $(top_builddir)lib/$(SHARED_LIBNAME:.$(ABI_VERSION)=)
  134. ifneq ($(ARCH_HAS_NO_SHARED),y)
  135. libdl.depend := $(top_builddir)lib/libdl.so
  136. endif
  137. ifneq ($(HAS_NO_THREADS),y)
  138. libpthread.depend := $(top_builddir)lib/libpthread.so
  139. endif
  140. interp := $(top_builddir)lib/interp.os
  141. ldso := $(top_builddir)lib/$(UCLIBC_LDSO)
  142. headers_dep := $(top_builddir)include/bits/sysnum.h
  143. sub_headers := $(headers_dep)
  144. #LIBS :=$(interp) -L$(top_builddir)lib -lc
  145. LIBS := $(interp) -L$(top_builddir)lib $(libc:.$(ABI_VERSION)=)
  146. # Make sure DESTDIR and PREFIX can be used to install
  147. # PREFIX is a uClibcism while DESTDIR is a common GNUism
  148. ifndef PREFIX
  149. PREFIX = $(DESTDIR)
  150. endif
  151. ifneq ($(HAVE_SHARED),y)
  152. libc :=
  153. interp :=
  154. ldso :=
  155. endif
  156. comma:=,
  157. space:= #
  158. ifeq ($(CROSS_COMPILE),)
  159. CROSS_COMPILE=$(call qstrip,$(CROSS_COMPILER_PREFIX))
  160. endif
  161. # A nifty macro to make testing gcc features easier
  162. check_gcc=$(shell \
  163. if $(CC) $(1) -S -o /dev/null -xc /dev/null > /dev/null 2>&1; \
  164. then echo "$(1)"; else echo "$(2)"; fi)
  165. check_as=$(shell \
  166. if $(CC) -Wa,$(1) -Wa,-Z -c -o /dev/null -xassembler /dev/null > /dev/null 2>&1; \
  167. then echo "-Wa,$(1)"; fi)
  168. check_ld=$(shell \
  169. if $(LD) $(1) -o /dev/null -b binary /dev/null > /dev/null 2>&1; \
  170. then echo "$(1)"; fi)
  171. # Use variable indirection here so that we can have variable
  172. # names with fun chars in them like equal signs
  173. define check-tool-var
  174. ifeq ($(filter $(clean_targets) CLEAN_%,$(MAKECMDGOALS)),)
  175. _v = $(2)_$(3)
  176. ifndef $$(_v)
  177. $$(_v) := $$(call $(1),$(subst %, ,$(3)))
  178. export $$(_v)
  179. endif
  180. endif
  181. endef
  182. # Usage: check-gcc-var,<flag>
  183. # Check the C compiler to see if it supports <flag>.
  184. # Export the variable CFLAG_<flag> if it does.
  185. define check-gcc-var
  186. $(call check-tool-var,check_gcc,CFLAG,$(1))
  187. endef
  188. # Usage: check-as-var,<flag>
  189. # Check the assembler to see if it supports <flag>. Export the
  190. # variable ASFLAG_<flag> if it does (for invoking the assembler),
  191. # as well CFLAG_-Wa<flag> (for invoking the compiler driver).
  192. define check-as-var
  193. $(call check-tool-var,check_as,ASFLAG,$(1))
  194. _v = CFLAG_-Wa$(1)
  195. export $$(_v) = $$(if $$(ASFLAG_$(1)),-Wa$$(comma)$$(ASFLAG_$(1)))
  196. endef
  197. # Usage: check-ld-var,<flag>
  198. # Check the linker to see if it supports <flag>. Export the
  199. # variable LDFLAG_<flag> if it does (for invoking the linker),
  200. # as well CFLAG_-Wl<flag> (for invoking the compiler driver).
  201. define check-ld-var
  202. $(call check-tool-var,check_ld,LDFLAG,$(1))
  203. _v = CFLAG_-Wl$(1)
  204. export $$(_v) = $$(if $$(LDFLAG_$(1)),-Wl$$(comma)$$(LDFLAG_$(1)))
  205. endef
  206. # Usage: cache-output-var,<variable>,<shell command>
  207. # Execute <shell command> and cache the output in <variable>.
  208. define cache-output-var
  209. ifndef $(1)
  210. $(1) := $$(shell $(2))
  211. export $(1)
  212. endif
  213. endef
  214. ARFLAGS:=cr
  215. # Flags in OPTIMIZATION are used only for non-debug builds
  216. OPTIMIZATION:=
  217. # Use '-Os' optimization if available, else use -O2, allow Config to override
  218. $(eval $(call check-gcc-var,-Os))
  219. ifneq ($(CFLAG_-Os),)
  220. OPTIMIZATION += $(CFLAG_-Os)
  221. else
  222. $(eval $(call check-gcc-var,-O2))
  223. OPTIMIZATION += $(CFLAG_-O2)
  224. endif
  225. # Use the gcc 3.4 -funit-at-a-time optimization when available
  226. $(eval $(call check-gcc-var,-funit-at-a-time))
  227. OPTIMIZATION += $(CFLAG_-funit-at-a-time)
  228. # shrinks code by about 0.1%
  229. $(eval $(call check-gcc-var,-fmerge-all-constants))
  230. $(eval $(call check-gcc-var,-fstrict-aliasing))
  231. OPTIMIZATION += $(CFLAG_-fmerge-all-constants) $(CFLAG_-fstrict-aliasing)
  232. $(eval $(call cache-output-var,GCC_VER,$(CC) -dumpversion))
  233. GCC_VER := $(subst ., ,$(GCC_VER))
  234. GCC_MAJOR_VER ?= $(word 1,$(GCC_VER))
  235. #GCC_MINOR_VER ?= $(word 2,$(GCC_VER))
  236. ifeq ($(GCC_MAJOR_VER),4)
  237. # shrinks code, results are from 4.0.2
  238. # 0.36%
  239. $(eval $(call check-gcc-var,-fno-tree-loop-optimize))
  240. OPTIMIZATION += $(CFLAG_-fno-tree-loop-optimize)
  241. # 0.34%
  242. $(eval $(call check-gcc-var,-fno-tree-dominator-opts))
  243. OPTIMIZATION += $(CFLAG_-fno-tree-dominator-opts)
  244. # 0.1%
  245. $(eval $(call check-gcc-var,-fno-strength-reduce))
  246. OPTIMIZATION += $(CFLAG_-fno-strength-reduce)
  247. endif
  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 += $(CFLAG_-fno-asm)
  255. LDADD_LIBFLOAT=
  256. ifeq ($(UCLIBC_HAS_SOFT_FLOAT),y)
  257. # If -msoft-float isn't supported, we want an error anyway.
  258. # Hmm... might need to revisit this for arm since it has 2 different
  259. # soft float encodings.
  260. ifneq ($(TARGET_ARCH),nios)
  261. ifneq ($(TARGET_ARCH),nios2)
  262. ifneq ($(TARGET_ARCH),sh)
  263. ifneq ($(TARGET_ARCH),c6x)
  264. CPU_CFLAGS-y += -msoft-float
  265. endif
  266. endif
  267. endif
  268. endif
  269. ifeq ($(TARGET_ARCH),arm)
  270. # No longer needed with current toolchains, but leave it here for now.
  271. # If anyone is actually still using gcc 2.95 (say), they can uncomment it.
  272. # LDADD_LIBFLOAT=-lfloat
  273. endif
  274. endif
  275. $(eval $(call check-gcc-var,-std=gnu99))
  276. CPU_CFLAGS-y += $(CFLAG_-std=gnu99)
  277. CPU_CFLAGS-$(UCLIBC_FORMAT_SHARED_FLAT) += -mid-shared-library
  278. CPU_CFLAGS-$(UCLIBC_FORMAT_FLAT_SEP_DATA) += -msep-data
  279. CPU_LDFLAGS-$(ARCH_LITTLE_ENDIAN) += -Wl,-EL
  280. CPU_LDFLAGS-$(ARCH_BIG_ENDIAN) += -Wl,-EB
  281. PICFLAG-y := -fPIC
  282. PICFLAG-$(UCLIBC_FORMAT_FDPIC_ELF) := -mfdpic
  283. PICFLAG-$(UCLIBC_FORMAT_DSBT_ELF) := -mdsbt -fpic
  284. PICFLAG := $(PICFLAG-y)
  285. PIEFLAG_NAME:=-fPIE
  286. # Some nice CPU specific optimizations
  287. ifeq ($(TARGET_ARCH),i386)
  288. $(eval $(call check-gcc-var,-fomit-frame-pointer))
  289. OPTIMIZATION += $(CFLAG_-fomit-frame-pointer)
  290. ifeq ($(CONFIG_386)$(CONFIG_486)$(CONFIG_586),y)
  291. # TODO: Change this to a gcc version check. This bug
  292. # should be fixed with at least gcc-4.3.
  293. # Non-SSE capable processor.
  294. # NB: this may make SSE insns segfault!
  295. # -O1 -march=pentium3, -Os -msse etc are known to be affected.
  296. # See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13685
  297. # -m32 is needed if host is 64-bit
  298. OPTIMIZATION+=$(call check_gcc,-m32 -mpreferred-stack-boundary=2,)
  299. else
  300. $(eval $(call check-gcc-var,-mpreferred-stack-boundary=4))
  301. OPTIMIZATION += $(CFLAG_-mpreferred-stack-boundary=4)
  302. endif
  303. # Choice of alignment (please document why!)
  304. # -falign-labels: in-line labels
  305. # (reachable by normal code flow, aligning will insert nops
  306. # which will be executed - may even make things slower)
  307. # -falign-jumps: reachable only by a jump
  308. # Generic: no alignment at all (smallest code)
  309. GCC_FALIGN=$(call check_gcc,-falign-functions=1 -falign-jumps=1 -falign-labels=1 -falign-loops=1,-malign-jumps=1 -malign-loops=1)
  310. OPTIMIZATION+=$(GCC_FALIGN)
  311. # Putting each function and data object into its own section
  312. # allows for kbytes of less text if users link against static uclibc
  313. # using ld --gc-sections.
  314. # ld 2.18 can't do that (yet?) for shared libraries, so we itself
  315. # do not use --gc-sections at shared lib link time.
  316. # However, in combination with sections being sorted by alignment
  317. # it does result in much reduced padding:
  318. # text data bss dec hex
  319. # 235319 1472 5992 242783 3b45f old.so
  320. # 234104 1472 5980 241556 3af94 new.so
  321. # Without -ffunction-sections, all functions will get aligned
  322. # to 4 byte boundary by as/ld. This is arguably a bug in as.
  323. # It specifies 4 byte align for .text even if not told to do so:
  324. # Idx Name Size VMA LMA File off Algn
  325. # 0 .text xxxxxxxx 00000000 00000000 xxxxxxxx 2**2 <===!
  326. CPU_CFLAGS-y += $(CFLAG_-ffunction-sections) $(CFLAG_-fdata-sections)
  327. CPU_LDFLAGS-y += $(CFLAG_-Wl--sort-common)
  328. $(eval $(call check-ld-var,--sort-section=alignment))
  329. CPU_LDFLAGS-y += $(CFLAG_-Wl--sort-section=alignment)
  330. CPU_LDFLAGS-y+=-m32
  331. CPU_CFLAGS-y+=-m32
  332. endif
  333. ifeq ($(TARGET_ARCH),sparc)
  334. CPU_CFLAGS-$(CONFIG_SPARC_V7)+=-mcpu=v7
  335. CPU_CFLAGS-$(CONFIG_SPARC_V8)+=-mcpu=v8
  336. CPU_CFLAGS-$(CONFIG_SPARC_V9)+=-mcpu=v9
  337. CPU_CFLAGS-$(CONFIG_SPARC_V9B)+=$(call check_gcc,-mcpu=v9b,-mcpu=ultrasparc)
  338. endif
  339. ifeq ($(TARGET_ARCH),arm)
  340. CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-mlittle-endian
  341. CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mbig-endian
  342. CPU_CFLAGS-$(COMPILE_IN_THUMB_MODE)+=-mthumb
  343. endif
  344. ifeq ($(TARGET_ARCH),metag)
  345. SYMBOL_PREFIX=_
  346. CPU_CFLAGS-$(CONFIG_META_1_2)+=
  347. CPU_CFLAGS-$(CONFIG_META_2_1)+=-Wa,-mcpu=metac21
  348. endif
  349. ifeq ($(TARGET_ARCH),mips)
  350. OPTIMIZATION+=-mno-split-addresses
  351. CPU_CFLAGS-$(CONFIG_MIPS_ISA_1)+=-mips1
  352. CPU_CFLAGS-$(CONFIG_MIPS_ISA_2)+=-mips2 -mtune=mips2
  353. CPU_CFLAGS-$(CONFIG_MIPS_ISA_3)+=-mips3 -mtune=mips3
  354. CPU_CFLAGS-$(CONFIG_MIPS_ISA_4)+=-mips4 -mtune=mips4
  355. CPU_CFLAGS-$(CONFIG_MIPS_ISA_MIPS32)+=-mips32 -mtune=mips32
  356. CPU_CFLAGS-$(CONFIG_MIPS_ISA_MIPS32R2)+=-march=mips32r2 -mtune=mips32r2
  357. CPU_CFLAGS-$(CONFIG_MIPS_ISA_MIPS64)+=-mips64 -mtune=mips32
  358. ifeq ($(strip $(ARCH_BIG_ENDIAN)),y)
  359. CPU_LDFLAGS-$(CONFIG_MIPS_N64_ABI)+=-Wl,-melf64btsmip
  360. CPU_LDFLAGS-$(CONFIG_MIPS_O32_ABI)+=-Wl,-melf32btsmip
  361. endif
  362. ifeq ($(strip $(ARCH_LITTLE_ENDIAN)),y)
  363. CPU_LDFLAGS-$(CONFIG_MIPS_N64_ABI)+=-Wl,-melf64ltsmip
  364. CPU_LDFLAGS-$(CONFIG_MIPS_O32_ABI)+=-Wl,-melf32ltsmip
  365. endif
  366. CPU_CFLAGS-$(CONFIG_MIPS_N64_ABI)+=-mabi=64
  367. CPU_CFLAGS-$(CONFIG_MIPS_O32_ABI)+=-mabi=32
  368. CPU_CFLAGS-$(CONFIG_MIPS_N32_ABI)+=-mabi=n32
  369. endif
  370. ifeq ($(TARGET_ARCH),nios)
  371. OPTIMIZATION+=-funaligned-struct-hack
  372. CPU_LDFLAGS-y+=-Wl,-m32
  373. CPU_CFLAGS-y+=-Wl,-m32
  374. endif
  375. ifeq ($(TARGET_ARCH),sh)
  376. $(eval $(call check-gcc-var,-mprefergot))
  377. OPTIMIZATION += $(CFLAG_-mprefergot)
  378. CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-ml
  379. CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mb
  380. CPU_CFLAGS-$(CONFIG_SH2)+=-m2
  381. CPU_CFLAGS-$(CONFIG_SH3)+=-m3
  382. ifeq ($(UCLIBC_HAS_FPU),y)
  383. CPU_CFLAGS-$(CONFIG_SH2A)+=-m2a
  384. CPU_CFLAGS-$(CONFIG_SH4)+=-m4
  385. else
  386. CPU_CFLAGS-$(CONFIG_SH2A)+=-m2a-nofpu
  387. CPU_CFLAGS-$(CONFIG_SH4)+=-m4-nofpu
  388. endif
  389. endif
  390. ifeq ($(TARGET_ARCH),sh64)
  391. CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN):=-ml
  392. CPU_CFLAGS-$(ARCH_BIG_ENDIAN):=-mb
  393. CPU_CFLAGS-$(CONFIG_SH5)+=-m5-32media
  394. endif
  395. ifeq ($(TARGET_ARCH),h8300)
  396. SYMBOL_PREFIX=_
  397. CPU_LDFLAGS-$(CONFIG_H8300H)+= -Wl,-ms8300h
  398. CPU_LDFLAGS-$(CONFIG_H8S) += -Wl,-ms8300s
  399. CPU_CFLAGS-$(CONFIG_H8300H) += -mh -mint32
  400. CPU_CFLAGS-$(CONFIG_H8S) += -ms -mint32
  401. endif
  402. ifeq ($(TARGET_ARCH),i960)
  403. OPTIMIZATION+=-mh -mint32 #-fsigned-char
  404. endif
  405. ifeq ($(TARGET_ARCH),e1)
  406. OPTIMIZATION+=-mgnu-param
  407. endif
  408. ifeq ($(TARGET_ARCH),cris)
  409. CPU_LDFLAGS-$(CONFIG_CRIS)+=-Wl,-mcrislinux
  410. CPU_LDFLAGS-$(CONFIG_CRISV32)+=-Wl,-mcrislinux
  411. CPU_CFLAGS-$(CONFIG_CRIS)+=-mlinux
  412. PICFLAG:=-fpic
  413. PIEFLAG_NAME:=-fpie
  414. endif
  415. ifeq ($(TARGET_ARCH),m68k)
  416. # -fPIC is only supported for 68020 and above. It is not supported
  417. # for 68000, 68010, or Coldfire.
  418. PICFLAG:=-fpic
  419. PIEFLAG_NAME:=-fpie
  420. endif
  421. ifeq ($(TARGET_ARCH),powerpc)
  422. # PowerPC can hold 8192 entries in its GOT with -fpic which is more than
  423. # enough. Therefore use -fpic which will reduce code size and generates
  424. # faster code.
  425. PICFLAG:=-fpic
  426. PIEFLAG_NAME:=-fpie
  427. PPC_HAS_REL16:=$(shell echo -e "\t.text\n\taddis 11,30,_GLOBAL_OFFSET_TABLE_-.@ha" | $(CC) -c -x assembler -o /dev/null - 2> /dev/null && echo -n y || echo -n n)
  428. CPU_CFLAGS-$(PPC_HAS_REL16)+= -DHAVE_ASM_PPC_REL16
  429. CPU_CFLAGS-$(CONFIG_E500) += "-D__NO_MATH_INLINES"
  430. endif
  431. ifeq ($(TARGET_ARCH),bfin)
  432. SYMBOL_PREFIX=_
  433. ifeq ($(UCLIBC_FORMAT_FDPIC_ELF),y)
  434. CPU_CFLAGS-y:=-mfdpic
  435. CPU_LDFLAGS-y += -Wl,-melf32bfinfd
  436. PICFLAG:=-fpic
  437. PIEFLAG_NAME:=-fpie
  438. endif
  439. ifeq ($(UCLIBC_FORMAT_SHARED_FLAT),y)
  440. PICFLAG := -mleaf-id-shared-library
  441. endif
  442. endif
  443. ifeq ($(TARGET_ARCH),frv)
  444. CPU_LDFLAGS-$(CONFIG_FRV)+=-Wl,-melf32frvfd
  445. # Using -pie causes the program to have an interpreter, which is
  446. # forbidden, so we must make do with -shared. Unfortunately,
  447. # -shared by itself would get us global function descriptors
  448. # and calls through PLTs, dynamic resolution of symbols, etc,
  449. # which would break as well, but -Bsymbolic comes to the rescue.
  450. export LDPIEFLAG:=-shared -Wl,-Bsymbolic
  451. UCLIBC_LDSO=ld.so.1
  452. endif
  453. ifeq ($(strip $(TARGET_ARCH)),avr32)
  454. CPU_CFLAGS-$(CONFIG_AVR32_AP7) += -march=ap
  455. CPU_CFLAGS-$(CONFIG_LINKRELAX) += -mrelax
  456. CPU_LDFLAGS-$(CONFIG_LINKRELAX) += --relax
  457. endif
  458. ifeq ($(TARGET_ARCH),i960)
  459. SYMBOL_PREFIX=_
  460. endif
  461. ifeq ($(TARGET_ARCH),v850)
  462. SYMBOL_PREFIX=_
  463. endif
  464. ifeq ($(TARGET_ARCH),c6x)
  465. PIEFLAG:=
  466. CPU_CFLAGS-$(CONFIG_TMS320C64X) += -march=c64x
  467. CPU_CFLAGS-$(CONFIG_TMS320C64XPLUS) += -march=c64x+
  468. CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-mlittle-endian
  469. CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mbig-endian
  470. CPU_LDFLAGS-y += $(CPU_CFLAGS)
  471. endif
  472. $(eval $(call check-gcc-var,$(PIEFLAG_NAME)))
  473. PIEFLAG := $(CFLAG_$(PIEFLAG_NAME))
  474. ifeq ($(PIEFLAG),)
  475. PIEFLAG := $(PICFLAG)
  476. endif
  477. # We need to keep track of both the CC PIE flag (above) as
  478. # well as the LD PIE flag (below) because we can't rely on
  479. # gcc passing -pie if we used -fPIE. We need to directly use -pie
  480. # instead of -Wl,-pie as gcc picks up the wrong startfile/endfile
  481. $(eval $(call cache-output-var,LDPIEFLAG,$(LD) --help 2>/dev/null | grep -q -- -pie && echo "-pie"))
  482. # Check for --as-needed support in linker
  483. ifndef LD_FLAG_ASNEEDED
  484. _LD_FLAG_ASNEEDED:=$(shell $(LD) --help 2>/dev/null | grep -- --as-needed)
  485. ifneq ($(_LD_FLAG_ASNEEDED),)
  486. export LD_FLAG_ASNEEDED:=--as-needed
  487. endif
  488. endif
  489. ifndef LD_FLAG_NO_ASNEEDED
  490. ifdef LD_FLAG_ASNEEDED
  491. export LD_FLAG_NO_ASNEEDED:=--no-as-needed
  492. endif
  493. endif
  494. ifndef CC_FLAG_ASNEEDED
  495. ifdef LD_FLAG_ASNEEDED
  496. export CC_FLAG_ASNEEDED:=-Wl,$(LD_FLAG_ASNEEDED)
  497. endif
  498. endif
  499. ifndef CC_FLAG_NO_ASNEEDED
  500. ifdef LD_FLAG_NO_ASNEEDED
  501. export CC_FLAG_NO_ASNEEDED:=-Wl,$(LD_FLAG_NO_ASNEEDED)
  502. endif
  503. endif
  504. link.asneeded = $(if $(findstring yy,$(CC_FLAG_ASNEEDED)$(CC_FLAG_NO_ASNEEDED)),$(CC_FLAG_ASNEEDED) $(1) $(CC_FLAG_NO_ASNEEDED))
  505. # Check for AS_NEEDED support in linker script (binutils>=2.16.1 has it)
  506. ifndef ASNEEDED
  507. export ASNEEDED:=$(shell $(LD) --help 2>/dev/null | grep -q -- --as-needed && echo "AS_NEEDED ( $(UCLIBC_LDSO) )" || echo "$(UCLIBC_LDSO)")
  508. # Only used in installed libc.so linker script
  509. ifeq ($(UCLIBC_HAS_BACKTRACE),y)
  510. ifeq ($(HARDWIRED_ABSPATH),y)
  511. UBACKTRACE_FULL_NAME := $(subst //,/,$(RUNTIME_PREFIX)$(MULTILIB_DIR)/$(UBACKTRACE_DSO))
  512. else
  513. UBACKTRACE_FULL_NAME := $(UBACKTRACE_DSO)
  514. endif
  515. export UBACKTRACE_ASNEEDED:=$(shell $(LD) --help 2>/dev/null | grep -q -- --as-needed && \
  516. echo "GROUP ( AS_NEEDED ( $(UBACKTRACE_FULL_NAME) ) )" || \
  517. echo "GROUP ( $(UBACKTRACE_FULL_NAME) )")
  518. else
  519. export UBACKTRACE_ASNEEDED:=""
  520. endif
  521. endif
  522. # Add a bunch of extra pedantic annoyingly strict checks
  523. WARNING_FLAGS = -Wstrict-prototypes -Wstrict-aliasing
  524. ifeq ($(EXTRA_WARNINGS),y)
  525. WARNING_FLAGS += \
  526. -Wformat=2 \
  527. -Wmissing-noreturn \
  528. -Wmissing-format-attribute \
  529. -Wmissing-prototypes \
  530. -Wmissing-declarations \
  531. -Wnested-externs \
  532. -Wnonnull \
  533. -Wold-style-declaration \
  534. -Wold-style-definition \
  535. -Wshadow \
  536. -Wundef
  537. # Works only w/ gcc-3.4 and up, can't be checked for gcc-3.x w/ check_gcc()
  538. WARNING_FLAGS-gcc-4 += -Wdeclaration-after-statement
  539. endif
  540. WARNING_FLAGS += $(WARNING_FLAGS-gcc-$(GCC_MAJOR_VER))
  541. $(foreach w,$(WARNING_FLAGS),$(eval $(call check-gcc-var,$(w))))
  542. XWARNINGS = $(call qstrip,$(WARNINGS)) $(foreach w,$(WARNING_FLAGS),$(CFLAG_$(w)))
  543. CPU_CFLAGS=$(call qstrip,$(CPU_CFLAGS-y))
  544. # Save the tested flag in a single variable and force it to be
  545. # evaluated just once. Then use that computed value.
  546. $(eval $(call check-gcc-var,-fno-stack-protector))
  547. SSP_DISABLE_FLAGS ?= $(CFLAG_-fno-stack-protector)
  548. ifeq ($(UCLIBC_BUILD_SSP),y)
  549. $(eval $(call check-gcc-var,-fno-stack-protector-all))
  550. $(eval $(call check-gcc-var,-fstack-protector))
  551. $(eval $(call check-gcc-var,-fstack-protector-all))
  552. SSP_CFLAGS := $(CFLAG_-fno-stack-protector-all)
  553. SSP_CFLAGS += $(CFLAG_-fstack-protector)
  554. SSP_ALL_CFLAGS ?= $(CFLAG_-fstack-protector-all)
  555. else
  556. SSP_CFLAGS := $(SSP_DISABLE_FLAGS)
  557. endif
  558. $(eval $(call check-gcc-var,-nostdlib))
  559. # Collect all CFLAGS components
  560. CFLAGS := $(XWARNINGS) $(CPU_CFLAGS) $(SSP_CFLAGS) \
  561. -nostdinc -I$(top_builddir)include \
  562. -I$(top_srcdir)include -include libc-symbols.h \
  563. -I$(top_srcdir)libc/sysdeps/linux/$(TARGET_ARCH) \
  564. -I$(top_srcdir)libc/sysdeps/linux \
  565. -I$(top_srcdir)ldso/ldso/$(TARGET_ARCH) \
  566. -I$(top_srcdir)ldso/include -I.
  567. ifneq ($(strip $(UCLIBC_EXTRA_CFLAGS)),"")
  568. CFLAGS += $(call qstrip,$(UCLIBC_EXTRA_CFLAGS))
  569. endif
  570. # We need this to be checked within libc-symbols.h
  571. ifneq ($(HAVE_SHARED),y)
  572. CFLAGS += -DSTATIC
  573. endif
  574. $(eval $(call check-ld-var,--warn-once))
  575. $(eval $(call check-ld-var,--sort-common))
  576. $(eval $(call check-ld-var,--discard-all))
  577. LDFLAGS_NOSTRIP:=$(CPU_LDFLAGS-y) -shared \
  578. -Wl,--warn-common $(CFLAG_-Wl--warn-once) -Wl,-z,combreloc
  579. # binutils-2.16.1 warns about ignored sections, 2.16.91.0.3 and newer are ok
  580. #$(eval $(call check-ld-var,--gc-sections))
  581. #LDFLAGS_NOSTRIP += $(LDFLAG_--gc-sections)
  582. $(eval $(call check-gcc-var,-fdata-sections))
  583. $(eval $(call check-gcc-var,-ffunction-sections))
  584. ifeq ($(UCLIBC_BUILD_RELRO),y)
  585. LDFLAGS_NOSTRIP+=-Wl,-z,relro
  586. endif
  587. ifeq ($(UCLIBC_BUILD_NOW),y)
  588. LDFLAGS_NOSTRIP+=-Wl,-z,now
  589. endif
  590. ifeq ($(LDSO_GNU_HASH_SUPPORT),y)
  591. # Be sure that binutils support it
  592. $(eval $(call check-ld-var,--hash-style=gnu))
  593. ifeq ($(LDFLAG_--hash-style=gnu),)
  594. ifneq ($(filter-out $(clean_targets) CLEAN_% install_headers headers-y,$(MAKECMDGOALS)),)
  595. $(error Your binutils do not support --hash-style option, while you want to use it)
  596. endif
  597. else
  598. LDFLAGS_NOSTRIP += $(CFLAG_-Wl--hash-style=gnu)
  599. endif
  600. endif
  601. LDFLAGS:=$(LDFLAGS_NOSTRIP) -Wl,-z,defs
  602. ifeq ($(DODEBUG),y)
  603. CFLAGS += -O0 -g3 -DDEBUG
  604. else
  605. CFLAGS += $(OPTIMIZATION)
  606. endif
  607. ifeq ($(DOSTRIP),y)
  608. LDFLAGS += -Wl,-s
  609. else
  610. STRIPTOOL := true -Stripping_disabled
  611. endif
  612. ifneq ($(strip $(UCLIBC_EXTRA_CFLAGS)),"")
  613. CFLAGS += $(call qstrip,$(UCLIBC_EXTRA_CFLAGS))
  614. endif
  615. ifeq ($(DOMULTI),y)
  616. # we try to compile all sources at once into an object (IMA), but
  617. # gcc-3.3.x does not support it
  618. # gcc-3.4.x supports it, but does not need and support --combine. though fails on many sources
  619. # gcc-4.0.x supports it, supports the --combine flag, but does not need it
  620. # gcc-4.1(200506xx) supports it, but needs the --combine flag, else libs are useless
  621. ifeq ($(GCC_MAJOR_VER),3)
  622. DOMULTI:=n
  623. else
  624. $(eval $(call check-gcc-var,--combine))
  625. CFLAGS += $(CFLAG_--combine)
  626. endif
  627. else
  628. DOMULTI:=n
  629. endif
  630. ifneq ($(strip $(UCLIBC_EXTRA_LDFLAGS)),"")
  631. LDFLAGS += $(call qstrip,$(UCLIBC_EXTRA_LDFLAGS))
  632. endif
  633. ifeq ($(UCLIBC_HAS_THREADS),y)
  634. ifeq ($(UCLIBC_HAS_THREADS_NATIVE),y)
  635. PTNAME := nptl
  636. CFLAGS += -DHAVE_FORCED_UNWIND
  637. else
  638. ifeq ($(LINUXTHREADS_OLD),y)
  639. PTNAME := linuxthreads.old
  640. else
  641. PTNAME := linuxthreads
  642. endif
  643. endif
  644. PTDIR := libpthread/$(PTNAME)
  645. # set up system dependencies include dirs (NOTE: order matters!)
  646. ifeq ($(UCLIBC_HAS_THREADS_NATIVE),y)
  647. PTINC:= -I$(top_builddir)$(PTDIR) \
  648. -I$(top_srcdir)$(PTDIR) \
  649. $(if $(TARGET_SUBARCH),-I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH)/$(TARGET_SUBARCH)) \
  650. -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH) \
  651. -I$(top_builddir)$(PTDIR)/sysdeps/$(TARGET_ARCH) \
  652. -I$(top_srcdir)$(PTDIR)/sysdeps/$(TARGET_ARCH) \
  653. -I$(top_builddir)$(PTDIR)/sysdeps/unix/sysv/linux \
  654. -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux \
  655. -I$(top_srcdir)$(PTDIR)/sysdeps/pthread \
  656. -I$(top_srcdir)$(PTDIR)/sysdeps/pthread/bits \
  657. -I$(top_srcdir)$(PTDIR)/sysdeps/generic
  658. #
  659. # Test for TLS if NPTL support was selected.
  660. #
  661. GCC_HAS_TLS=$(shell \
  662. echo "extern __thread int foo;" | $(CC) -o /dev/null -S -xc - 2>&1)
  663. ifneq ($(GCC_HAS_TLS),)
  664. gcc_tls_test_fail:
  665. @echo "####";
  666. @echo "#### Your compiler does not support TLS and you are trying to build uClibc";
  667. @echo "#### with NPTL support. Upgrade your binutils and gcc to versions which";
  668. @echo "#### support TLS for your architecture. Do not contact uClibc maintainers";
  669. @echo "#### about this problem.";
  670. @echo "####";
  671. @echo "#### Exiting...";
  672. @echo "####";
  673. @exit 1;
  674. endif
  675. else
  676. PTINC := \
  677. -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH) \
  678. -I$(top_srcdir)$(PTDIR)/sysdeps/$(TARGET_ARCH) \
  679. -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux \
  680. -I$(top_srcdir)$(PTDIR)/sysdeps/pthread \
  681. -I$(top_srcdir)$(PTDIR) \
  682. -I$(top_srcdir)libpthread
  683. endif
  684. CFLAGS+=$(PTINC)
  685. else
  686. PTNAME :=
  687. PTINC :=
  688. endif
  689. CFLAGS += -I$(top_srcdir)libc/sysdeps/linux/common
  690. #CFLAGS += -iwithprefix include-fixed -iwithprefix include
  691. $(eval $(call cache-output-var,CC_IPREFIX,$(CC) -print-file-name=include))
  692. CC_INC := -isystem $(dir $(CC_IPREFIX))include-fixed -isystem $(CC_IPREFIX)
  693. CFLAGS += $(CC_INC)
  694. CFLAGS += -I$(KERNEL_HEADERS)
  695. ifneq ($(DOASSERTS),y)
  696. CFLAGS+=-DNDEBUG
  697. endif
  698. ifeq ($(SYMBOL_PREFIX),_)
  699. CFLAGS+=-D__UCLIBC_UNDERSCORES__
  700. endif
  701. # Keep the check_as from being needlessly executed
  702. ifeq ($(UCLIBC_BUILD_NOEXECSTACK),y)
  703. $(eval $(call check-as-var,--noexecstack))
  704. endif
  705. ASFLAGS = $(ASFLAG_--noexecstack)
  706. LIBGCC_CFLAGS ?= $(CFLAGS) $(CPU_CFLAGS-y)
  707. $(eval $(call cache-output-var,LIBGCC,$(CC) $(LIBGCC_CFLAGS) -print-libgcc-file-name))
  708. $(eval $(call cache-output-var,LIBGCC_EH,$(CC) $(LIBGCC_CFLAGS) -print-file-name=libgcc_eh.a))
  709. # with -O0 we (e.g. lockf) might end up with references to
  710. # _Unwind_Resume, so pull in gcc_eh in this case..
  711. LIBGCC_DIR:=$(dir $(LIBGCC))
  712. LIBGCC += $(if $(DODEBUG),$(LIBGCC_EH))
  713. # moved from libpthread/linuxthreads
  714. ifeq ($(UCLIBC_CTOR_DTOR),y)
  715. SHARED_START_FILES:=$(top_builddir)lib/crti.o $(LIBGCC_DIR)crtbeginS.o
  716. SHARED_END_FILES:=$(LIBGCC_DIR)crtendS.o $(top_builddir)lib/crtn.o
  717. endif
  718. LOCAL_INSTALL_PATH := $(if $(O),$(O)/)install_dir
  719. PTHREAD_GENERATE_MANGLE ?= -n "s/^.*@@@name@@@\([^@]*\)@@@value@@@[^0-9Xxa-fA-F-]*\([0-9Xxa-fA-F-][0-9Xxa-fA-F-]*\).*@@@end@@@.*\$$/\#define \1 \2/p"