Rules.mak 27 KB

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  1. # Rules.make for uClibc
  2. #
  3. # Copyright (C) 2000-2008 Erik Andersen <andersen@uclibc.org>
  4. #
  5. # Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
  6. #
  7. # make nano-doc
  8. # FOO = bar -- recursively expanded variable. Value is remebered verbatim.
  9. # If it contains references to other variables, these references
  10. # are expanded whenever this variable is _substituted_.
  11. # FOO := bar -- simply expanded variable. Right hand is expanded when
  12. # the variable is _defined_. Therefore faster than =.
  13. # FOO ?= bar -- set a value only if it is not already set
  14. # (behaves as =, not :=).
  15. # FOO += bar -- append; if FOO is not defined, acts like = (not :=).
  16. # check for proper make version
  17. ifneq ($(findstring x3.7,x$(MAKE_VERSION)),)
  18. $(error Your make is too old $(MAKE_VERSION). Go get at least 3.80)
  19. endif
  20. #-----------------------------------------------------------
  21. # This file contains rules which are shared between multiple
  22. # Makefiles. All normal configuration options live in the
  23. # file named ".config". Don't mess with this file unless
  24. # you know what you are doing.
  25. clean_targets := clean realclean distclean \
  26. objclean-y headers_clean-y CLEAN_utils
  27. noconfig_targets := menuconfig config nconfig \
  28. oldaskconfig silentoldconfig oldconfig allnoconfig allyesconfig \
  29. alldefconfig randconfig defconfig savedefconfig listnewconfig \
  30. olddefconfig \
  31. xconfig gconfig update-po-config mconf qconf gconf nconf conf \
  32. release dist tags help
  33. #-----------------------------------------------------------
  34. # If you are running a cross compiler, you will want to set
  35. # 'CROSS_COMPILE' to something more interesting ... Target
  36. # architecture is determined by asking the CC compiler what
  37. # arch it compiles things for, so unless your compiler is
  38. # broken, you should not need to specify TARGET_ARCH.
  39. #
  40. # Most people will set this stuff on the command line, i.e.
  41. # make CROSS_COMPILE=arm-linux-
  42. # will build uClibc for 'arm'.
  43. # CROSS is still supported for backward compatibily only
  44. CROSS_COMPILE ?= $(CROSS)
  45. CC = $(CROSS_COMPILE)gcc
  46. AR = $(CROSS_COMPILE)ar
  47. LD = $(CROSS_COMPILE)ld
  48. NM = $(CROSS_COMPILE)nm
  49. OBJDUMP = $(CROSS_COMPILE)objdump
  50. STRIPTOOL = $(CROSS_COMPILE)strip
  51. INSTALL = install
  52. LN = ln
  53. RM = rm -f
  54. TAR = tar
  55. SED = sed
  56. AWK = awk
  57. STRIP_FLAGS ?= -x -R .note -R .comment
  58. ## unused? if yes, remove after 0.9.31
  59. ## UNIFDEF := $(top_builddir)extra/scripts/unifdef
  60. # Select the compiler needed to build binaries for your development system
  61. HOSTCC = gcc
  62. BUILD_CFLAGS = -Os
  63. #---------------------------------------------------------
  64. # Nothing beyond this point should ever be touched by mere
  65. # mortals. Unless you hang out with the gods, you should
  66. # probably leave all this stuff alone.
  67. # strip quotes
  68. qstrip = $(strip $(subst ",,$(1)))
  69. #"))
  70. # kconfig stuff
  71. KCONFIG_CONFIG ?= $(top_builddir).config
  72. KCONFIG_CONFIG := $(abspath $(KCONFIG_CONFIG))
  73. export KCONFIG_CONFIG
  74. KCONFIG_AUTOCONFIG := $(dir $(KCONFIG_CONFIG))include/config/auto.conf
  75. export KCONFIG_AUTOCONFIG
  76. KCONFIG_TRISTATE := $(dir $(KCONFIG_CONFIG))include/config/tristate.conf
  77. export KCONFIG_TRISTATE
  78. srctree := $(abspath $(top_srcdir))
  79. export srctree
  80. KCONFIG_AUTOHEADER := $(dir $(KCONFIG_CONFIG))include/generated/autoconf.h
  81. export KCONFIG_AUTOHEADER
  82. Kconfig := $(abspath $(top_srcdir)extra/Configs/Config.in)
  83. # Pull in the user's uClibc configuration
  84. ifeq ($(filter $(noconfig_targets) clean CLEAN_%,$(MAKECMDGOALS)),)
  85. -include $(KCONFIG_CONFIG)
  86. endif
  87. TARGET_ARCH:=$(call qstrip,$(TARGET_ARCH))
  88. ifeq ($(TARGET_ARCH),)
  89. ARCH ?= $(shell uname -m | $(SED) -e s/i.86/i386/ \
  90. -e s/sun.*/sparc/ -e s/sparc.*/sparc/ \
  91. -e s/arm.*/arm/ -e s/sa110/arm/ \
  92. -e s/sh.*/sh/ \
  93. -e s/s390x/s390/ -e s/parisc.*/hppa/ \
  94. -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
  95. -e s/xtensa.*/xtensa/ )
  96. else
  97. ARCH = $(TARGET_ARCH)
  98. endif
  99. export ARCH
  100. # Make certain these contain a final "/", but no "//"s.
  101. scrub_path = $(strip $(subst //,/, $(subst ,/, $(call qstrip,$(1)))))
  102. TARGET_SUBARCH := $(call qstrip,$(TARGET_SUBARCH))
  103. RUNTIME_PREFIX := $(call scrub_path,$(RUNTIME_PREFIX))
  104. DEVEL_PREFIX := $(call scrub_path,$(DEVEL_PREFIX))
  105. MULTILIB_DIR := $(call scrub_path,$(MULTILIB_DIR))
  106. KERNEL_HEADERS := $(call scrub_path,$(KERNEL_HEADERS))
  107. export RUNTIME_PREFIX DEVEL_PREFIX KERNEL_HEADERS MULTILIB_DIR
  108. # Now config hard core
  109. MAJOR_VERSION := 0
  110. MINOR_VERSION := 9
  111. SUBLEVEL := 34
  112. EXTRAVERSION :=-git
  113. VERSION := $(MAJOR_VERSION).$(MINOR_VERSION).$(SUBLEVEL)
  114. ABI_VERSION := $(MAJOR_VERSION)
  115. ifneq ($(EXTRAVERSION),)
  116. VERSION := $(VERSION)$(EXTRAVERSION)
  117. endif
  118. # Ensure consistent sort order, 'gcc -print-search-dirs' behavior, etc.
  119. LC_ALL := C
  120. export MAJOR_VERSION MINOR_VERSION SUBLEVEL VERSION ABI_VERSION LC_ALL
  121. LIBC := libc
  122. SHARED_LIBNAME := $(LIBC).so.$(ABI_VERSION)
  123. UBACKTRACE_DSO := libubacktrace.so.$(ABI_VERSION)
  124. UCLIBC_LDSO_NAME := ld-uClibc
  125. ARCH_NATIVE_BIT := 32
  126. ifneq ($(findstring $(TARGET_ARCH) , hppa64 ia64 powerpc64 s390x sparc64 x86_64 ),)
  127. UCLIBC_LDSO_NAME := ld64-uClibc
  128. ARCH_NATIVE_BIT := 64
  129. else
  130. ifeq ($(CONFIG_MIPS_N64_ABI),y)
  131. UCLIBC_LDSO_NAME := ld64-uClibc
  132. ARCH_NATIVE_BIT := 64
  133. endif
  134. endif
  135. UCLIBC_LDSO := $(UCLIBC_LDSO_NAME).so.$(ABI_VERSION)
  136. NONSHARED_LIBNAME := uclibc_nonshared.a
  137. libc := $(top_builddir)lib/$(SHARED_LIBNAME)
  138. libc.depend := $(top_builddir)lib/$(SHARED_LIBNAME:.$(ABI_VERSION)=)
  139. ifneq ($(ARCH_HAS_NO_SHARED),y)
  140. libdl.depend := $(top_builddir)lib/libdl.so
  141. endif
  142. ifneq ($(HAS_NO_THREADS),y)
  143. libpthread.depend := $(top_builddir)lib/libpthread.so
  144. endif
  145. interp := $(top_builddir)lib/interp.os
  146. ldso := $(top_builddir)lib/$(UCLIBC_LDSO)
  147. headers_dep := $(top_builddir)include/bits/sysnum.h
  148. sub_headers := $(headers_dep)
  149. #LIBS :=$(interp) -L$(top_builddir)lib -lc
  150. LIBS := $(interp) -L$(top_builddir)lib $(libc:.$(ABI_VERSION)=)
  151. # Make sure DESTDIR and PREFIX can be used to install
  152. # PREFIX is a uClibcism while DESTDIR is a common GNUism
  153. ifndef PREFIX
  154. PREFIX = $(DESTDIR)
  155. endif
  156. ifneq ($(HAVE_SHARED),y)
  157. libc :=
  158. interp :=
  159. ldso :=
  160. endif
  161. comma:=,
  162. space:= #
  163. ifeq ($(CROSS_COMPILE),)
  164. CROSS_COMPILE=$(call qstrip,$(CROSS_COMPILER_PREFIX))
  165. endif
  166. # A nifty macro to make testing gcc features easier
  167. check_gcc=$(shell \
  168. if $(CC) $(1) -S -o /dev/null -xc /dev/null > /dev/null 2>&1; \
  169. then echo "$(1)"; else echo "$(2)"; fi)
  170. check_as=$(shell \
  171. if $(CC) -Wa,$(1) -Wa,-Z -c -o /dev/null -xassembler /dev/null > /dev/null 2>&1; \
  172. then echo "-Wa,$(1)"; fi)
  173. check_ld=$(shell \
  174. if $(CC) $(LDFLAG-fuse-ld) $(CFLAG_-Wl--no-warn-mismatch) -Wl,$(1) $(CFLAG_-nostdlib) -o /dev/null -Wl,-b,binary /dev/null > /dev/null 2>&1; \
  175. then echo "$(1)"; fi)
  176. # Use variable indirection here so that we can have variable
  177. # names with fun chars in them like equal signs
  178. define check-tool-var
  179. ifeq ($(filter $(clean_targets) CLEAN_%,$(MAKECMDGOALS)),)
  180. _v = $(2)_$(3)
  181. ifndef $$(_v)
  182. $$(_v) := $$(call $(1),$(subst %, ,$(3)))
  183. export $$(_v)
  184. endif
  185. endif
  186. endef
  187. # Usage: check-gcc-var,<flag>
  188. # Check the C compiler to see if it supports <flag>.
  189. # Export the variable CFLAG_<flag> if it does.
  190. define check-gcc-var
  191. $(call check-tool-var,check_gcc,CFLAG,$(1))
  192. endef
  193. # Usage: check-as-var,<flag>
  194. # Check the assembler to see if it supports <flag>. Export the
  195. # variable ASFLAG_<flag> if it does (for invoking the assembler),
  196. # as well CFLAG_-Wa<flag> (for invoking the compiler driver).
  197. define check-as-var
  198. $(call check-tool-var,check_as,ASFLAG,$(1))
  199. _v = CFLAG_-Wa$(1)
  200. export $$(_v) = $$(if $$(ASFLAG_$(1)),-Wa$$(comma)$$(ASFLAG_$(1)))
  201. endef
  202. # Usage: check-ld-var,<flag>
  203. # Check the linker to see if it supports <flag>. Export the
  204. # variable LDFLAG_<flag> if it does (for invoking the linker),
  205. # as well CFLAG_-Wl<flag> (for invoking the compiler driver).
  206. define check-ld-var
  207. $(call check-tool-var,check_ld,LDFLAG,$(1))
  208. _v = CFLAG_-Wl$(1)
  209. export $$(_v) = $$(if $$(LDFLAG_$(1)),-Wl$$(comma)$$(LDFLAG_$(1)))
  210. endef
  211. # Usage: cache-output-var,<variable>,<shell command>
  212. # Execute <shell command> and cache the output in <variable>.
  213. define cache-output-var
  214. ifndef $(1)
  215. $(1) := $$(shell $(2))
  216. export $(1)
  217. endif
  218. endef
  219. ARFLAGS:=cr
  220. # Note: The check for -nostdlib has to be before all calls to check_ld
  221. $(eval $(call check-gcc-var,-nostdlib))
  222. # deliberately not named CFLAG-fuse-ld since unchecked and from user
  223. LDFLAG-fuse-ld := $(filter -fuse-ld=%,$(EXTRA_UCLIBC_FLAGS))
  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. # Flags in OPTIMIZATION are used only for non-debug builds
  228. OPTIMIZATION:=
  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 += $(CFLAG_-funit-at-a-time)
  240. # shrinks code by about 0.1%
  241. $(eval $(call check-gcc-var,-fmerge-all-constants))
  242. $(eval $(call check-gcc-var,-fstrict-aliasing))
  243. OPTIMIZATION += $(CFLAG_-fmerge-all-constants) $(CFLAG_-fstrict-aliasing)
  244. $(eval $(call cache-output-var,GCC_VER,$(CC) -dumpversion))
  245. GCC_VER := $(subst ., ,$(GCC_VER))
  246. GCC_MAJOR_VER ?= $(word 1,$(GCC_VER))
  247. #GCC_MINOR_VER ?= $(word 2,$(GCC_VER))
  248. ifneq ($(TARGET_ARCH),arc)
  249. ifeq ($(GCC_MAJOR_VER),4)
  250. # shrinks code, results are from 4.0.2
  251. # 0.36%
  252. $(eval $(call check-gcc-var,-fno-tree-loop-optimize))
  253. OPTIMIZATION += $(CFLAG_-fno-tree-loop-optimize)
  254. # 0.34%
  255. $(eval $(call check-gcc-var,-fno-tree-dominator-opts))
  256. OPTIMIZATION += $(CFLAG_-fno-tree-dominator-opts)
  257. # 0.1%
  258. $(eval $(call check-gcc-var,-fno-strength-reduce))
  259. OPTIMIZATION += $(CFLAG_-fno-strength-reduce)
  260. endif
  261. endif
  262. # CPU_CFLAGS-y contain options which are not warnings,
  263. # not include or library paths, and not optimizations.
  264. # Why -funsigned-char: I hunted a bug related to incorrect
  265. # sign extension of 'char' type for 10 hours straight. Not fun.
  266. CPU_CFLAGS-y := -funsigned-char -fno-builtin
  267. $(eval $(call check-gcc-var,-fno-asm))
  268. CPU_CFLAGS-y += $(CFLAG_-fno-asm)
  269. LDADD_LIBFLOAT=
  270. ifeq ($(UCLIBC_HAS_SOFT_FLOAT),y)
  271. # If -msoft-float isn't supported, we want an error anyway.
  272. # Hmm... might need to revisit this for arm since it has 2 different
  273. # soft float encodings.
  274. ifneq ($(TARGET_ARCH),nios)
  275. ifneq ($(TARGET_ARCH),nios2)
  276. ifneq ($(TARGET_ARCH),sh)
  277. ifneq ($(TARGET_ARCH),c6x)
  278. CPU_CFLAGS-y += -msoft-float
  279. endif
  280. endif
  281. endif
  282. endif
  283. ifeq ($(TARGET_ARCH),arm)
  284. # No longer needed with current toolchains, but leave it here for now.
  285. # If anyone is actually still using gcc 2.95 (say), they can uncomment it.
  286. # LDADD_LIBFLOAT=-lfloat
  287. endif
  288. endif
  289. $(eval $(call check-gcc-var,-std=gnu99))
  290. CPU_CFLAGS-y += $(CFLAG_-std=gnu99)
  291. CPU_CFLAGS-$(UCLIBC_FORMAT_SHARED_FLAT) += -mid-shared-library
  292. CPU_CFLAGS-$(UCLIBC_FORMAT_FLAT_SEP_DATA) += -msep-data
  293. CPU_LDFLAGS-$(ARCH_LITTLE_ENDIAN) += -Wl,-EL
  294. CPU_LDFLAGS-$(ARCH_BIG_ENDIAN) += -Wl,-EB
  295. PICFLAG-y := -fPIC
  296. PICFLAG-$(UCLIBC_FORMAT_FDPIC_ELF) := -mfdpic
  297. PICFLAG-$(UCLIBC_FORMAT_DSBT_ELF) := -mdsbt -fpic
  298. PICFLAG := $(PICFLAG-y)
  299. PIEFLAG_NAME:=-fPIE
  300. # Some nice CPU specific optimizations
  301. ifeq ($(TARGET_ARCH),i386)
  302. $(eval $(call check-gcc-var,-fomit-frame-pointer))
  303. OPTIMIZATION += $(CFLAG_-fomit-frame-pointer)
  304. ifeq ($(CONFIG_386)$(CONFIG_486)$(CONFIG_586),y)
  305. # TODO: Change this to a gcc version check. This bug
  306. # should be fixed with at least gcc-4.3.
  307. # Non-SSE capable processor.
  308. # NB: this may make SSE insns segfault!
  309. # -O1 -march=pentium3, -Os -msse etc are known to be affected.
  310. # See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13685
  311. # -m32 is needed if host is 64-bit
  312. OPTIMIZATION+=$(call check_gcc,-m32 -mpreferred-stack-boundary=2,)
  313. else
  314. $(eval $(call check-gcc-var,-mpreferred-stack-boundary=4))
  315. OPTIMIZATION += $(CFLAG_-mpreferred-stack-boundary=4)
  316. endif
  317. # Choice of alignment (please document why!)
  318. # -falign-labels: in-line labels
  319. # (reachable by normal code flow, aligning will insert nops
  320. # which will be executed - may even make things slower)
  321. # -falign-jumps: reachable only by a jump
  322. # Generic: no alignment at all (smallest code)
  323. GCC_FALIGN=$(call check_gcc,-falign-functions=1 -falign-jumps=1 -falign-labels=1 -falign-loops=1,-malign-jumps=1 -malign-loops=1)
  324. OPTIMIZATION+=$(GCC_FALIGN)
  325. # Putting each function and data object into its own section
  326. # allows for kbytes of less text if users link against static uclibc
  327. # using ld --gc-sections.
  328. # ld 2.18 can't do that (yet?) for shared libraries, so we itself
  329. # do not use --gc-sections at shared lib link time.
  330. # However, in combination with sections being sorted by alignment
  331. # it does result in much reduced padding:
  332. # text data bss dec hex
  333. # 235319 1472 5992 242783 3b45f old.so
  334. # 234104 1472 5980 241556 3af94 new.so
  335. # Without -ffunction-sections, all functions will get aligned
  336. # to 4 byte boundary by as/ld. This is arguably a bug in as.
  337. # It specifies 4 byte align for .text even if not told to do so:
  338. # Idx Name Size VMA LMA File off Algn
  339. # 0 .text xxxxxxxx 00000000 00000000 xxxxxxxx 2**2 <===!
  340. CPU_CFLAGS-y += $(CFLAG_-ffunction-sections) $(CFLAG_-fdata-sections)
  341. CPU_LDFLAGS-y += $(CFLAG_-Wl--sort-common)
  342. $(eval $(call check-ld-var,--sort-section=alignment))
  343. CPU_LDFLAGS-y += $(CFLAG_-Wl--sort-section=alignment)
  344. CPU_LDFLAGS-y+=-m32
  345. CPU_CFLAGS-y+=-m32
  346. endif
  347. ifeq ($(TARGET_ARCH),sparc)
  348. CPU_CFLAGS-$(CONFIG_SPARC_V7)+=-mcpu=v7
  349. CPU_CFLAGS-$(CONFIG_SPARC_V8)+=-mcpu=v8
  350. CPU_CFLAGS-$(CONFIG_SPARC_V9)+=-mcpu=v9
  351. CPU_CFLAGS-$(CONFIG_SPARC_V9B)+=$(call check_gcc,-mcpu=v9b,-mcpu=ultrasparc)
  352. endif
  353. ifeq ($(TARGET_ARCH),arm)
  354. CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-mlittle-endian
  355. CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mbig-endian
  356. CPU_CFLAGS-$(COMPILE_IN_THUMB_MODE)+=-mthumb
  357. endif
  358. ifeq ($(TARGET_ARCH),metag)
  359. SYMBOL_PREFIX=_
  360. CPU_CFLAGS-$(CONFIG_META_1_2)+=
  361. CPU_CFLAGS-$(CONFIG_META_2_1)+=-Wa,-mcpu=metac21
  362. endif
  363. ifeq ($(TARGET_ARCH),mips)
  364. OPTIMIZATION+=-mno-split-addresses
  365. CPU_CFLAGS-$(CONFIG_MIPS_ISA_1)+=-mips1
  366. CPU_CFLAGS-$(CONFIG_MIPS_ISA_2)+=-mips2 -mtune=mips2
  367. CPU_CFLAGS-$(CONFIG_MIPS_ISA_3)+=-mips3 -mtune=mips3
  368. CPU_CFLAGS-$(CONFIG_MIPS_ISA_4)+=-mips4 -mtune=mips4
  369. CPU_CFLAGS-$(CONFIG_MIPS_ISA_MIPS32)+=-mips32 -mtune=mips32
  370. CPU_CFLAGS-$(CONFIG_MIPS_ISA_MIPS32R2)+=-march=mips32r2 -mtune=mips32r2
  371. CPU_CFLAGS-$(CONFIG_MIPS_ISA_MIPS64)+=-mips64 -mtune=mips32
  372. CPU_CFLAGS-$(CONFIG_MIPS_ISA_MIPS64R2)+=-mips64r2 -mtune=mips64r2
  373. ifeq ($(strip $(ARCH_BIG_ENDIAN)),y)
  374. CPU_LDFLAGS-$(CONFIG_MIPS_N64_ABI)+=-Wl,-melf64btsmip
  375. CPU_LDFLAGS-$(CONFIG_MIPS_O32_ABI)+=-Wl,-melf32btsmip
  376. endif
  377. ifeq ($(strip $(ARCH_LITTLE_ENDIAN)),y)
  378. CPU_LDFLAGS-$(CONFIG_MIPS_N64_ABI)+=-Wl,-melf64ltsmip
  379. CPU_LDFLAGS-$(CONFIG_MIPS_O32_ABI)+=-Wl,-melf32ltsmip
  380. endif
  381. CPU_CFLAGS-$(CONFIG_MIPS_N64_ABI)+=-mabi=64
  382. CPU_CFLAGS-$(CONFIG_MIPS_O32_ABI)+=-mabi=32
  383. CPU_CFLAGS-$(CONFIG_MIPS_N32_ABI)+=-mabi=n32
  384. endif
  385. ifeq ($(TARGET_ARCH),nios)
  386. OPTIMIZATION+=-funaligned-struct-hack
  387. CPU_LDFLAGS-y+=-Wl,-m32
  388. CPU_CFLAGS-y+=-Wl,-m32
  389. endif
  390. ifeq ($(TARGET_ARCH),sh)
  391. $(eval $(call check-gcc-var,-mprefergot))
  392. OPTIMIZATION += $(CFLAG_-mprefergot)
  393. CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-ml
  394. CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mb
  395. CPU_CFLAGS-$(CONFIG_SH2)+=-m2
  396. CPU_CFLAGS-$(CONFIG_SH3)+=-m3
  397. ifeq ($(UCLIBC_HAS_FPU),y)
  398. CPU_CFLAGS-$(CONFIG_SH2A)+=-m2a
  399. CPU_CFLAGS-$(CONFIG_SH4)+=-m4
  400. else
  401. CPU_CFLAGS-$(CONFIG_SH2A)+=-m2a-nofpu
  402. CPU_CFLAGS-$(CONFIG_SH4)+=-m4-nofpu
  403. endif
  404. endif
  405. ifeq ($(TARGET_ARCH),sh64)
  406. CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN):=-ml
  407. CPU_CFLAGS-$(ARCH_BIG_ENDIAN):=-mb
  408. CPU_CFLAGS-$(CONFIG_SH5)+=-m5-32media
  409. endif
  410. ifeq ($(TARGET_ARCH),h8300)
  411. SYMBOL_PREFIX=_
  412. CPU_LDFLAGS-$(CONFIG_H8300H)+= -Wl,-ms8300h
  413. CPU_LDFLAGS-$(CONFIG_H8S) += -Wl,-ms8300s
  414. CPU_CFLAGS-$(CONFIG_H8300H) += -mh -mint32
  415. CPU_CFLAGS-$(CONFIG_H8S) += -ms -mint32
  416. endif
  417. ifeq ($(TARGET_ARCH),i960)
  418. OPTIMIZATION+=-mh -mint32 #-fsigned-char
  419. endif
  420. ifeq ($(TARGET_ARCH),e1)
  421. OPTIMIZATION+=-mgnu-param
  422. endif
  423. ifeq ($(TARGET_ARCH),cris)
  424. CPU_LDFLAGS-$(CONFIG_CRIS)+=-Wl,-mcrislinux
  425. CPU_LDFLAGS-$(CONFIG_CRISV32)+=-Wl,-mcrislinux
  426. CPU_CFLAGS-$(CONFIG_CRIS)+=-mlinux
  427. PICFLAG:=-fpic
  428. PIEFLAG_NAME:=-fpie
  429. endif
  430. ifeq ($(TARGET_ARCH),m68k)
  431. # -fPIC is only supported for 68020 and above. It is not supported
  432. # for 68000, 68010, or Coldfire.
  433. PICFLAG:=-fpic
  434. PIEFLAG_NAME:=-fpie
  435. endif
  436. ifeq ($(TARGET_ARCH),powerpc)
  437. # PowerPC can hold 8192 entries in its GOT with -fpic which is more than
  438. # enough. Therefore use -fpic which will reduce code size and generates
  439. # faster code.
  440. PICFLAG:=-fpic
  441. PIEFLAG_NAME:=-fpie
  442. PPC_HAS_REL16:=$(shell echo -e "\t.text\n\taddis 11,30,_GLOBAL_OFFSET_TABLE_-.@ha" | $(CC) -c -x assembler -o /dev/null - 2> /dev/null && echo -n y || echo -n n)
  443. CPU_CFLAGS-$(PPC_HAS_REL16)+= -DHAVE_ASM_PPC_REL16
  444. CPU_CFLAGS-$(CONFIG_E500) += "-D__NO_MATH_INLINES"
  445. endif
  446. ifeq ($(TARGET_ARCH),bfin)
  447. SYMBOL_PREFIX=_
  448. ifeq ($(UCLIBC_FORMAT_FDPIC_ELF),y)
  449. CPU_CFLAGS-y:=-mfdpic
  450. CPU_LDFLAGS-y += -Wl,-melf32bfinfd
  451. PICFLAG:=-fpic
  452. PIEFLAG_NAME:=-fpie
  453. endif
  454. ifeq ($(UCLIBC_FORMAT_SHARED_FLAT),y)
  455. PICFLAG := -mleaf-id-shared-library
  456. endif
  457. endif
  458. ifeq ($(TARGET_ARCH),frv)
  459. CPU_LDFLAGS-$(CONFIG_FRV)+=-Wl,-melf32frvfd
  460. # Using -pie causes the program to have an interpreter, which is
  461. # forbidden, so we must make do with -shared. Unfortunately,
  462. # -shared by itself would get us global function descriptors
  463. # and calls through PLTs, dynamic resolution of symbols, etc,
  464. # which would break as well, but -Bsymbolic comes to the rescue.
  465. export LDPIEFLAG:=-shared -Wl,-Bsymbolic
  466. UCLIBC_LDSO=ld.so.1
  467. endif
  468. ifeq ($(strip $(TARGET_ARCH)),avr32)
  469. CPU_CFLAGS-$(CONFIG_AVR32_AP7) += -march=ap
  470. CPU_CFLAGS-$(CONFIG_LINKRELAX) += -mrelax
  471. CPU_LDFLAGS-$(CONFIG_LINKRELAX) += --relax
  472. endif
  473. ifeq ($(TARGET_ARCH),i960)
  474. SYMBOL_PREFIX=_
  475. endif
  476. ifeq ($(TARGET_ARCH),v850)
  477. SYMBOL_PREFIX=_
  478. endif
  479. ifeq ($(TARGET_ARCH),c6x)
  480. PIEFLAG:=
  481. CPU_CFLAGS-$(CONFIG_TMS320C64X) += -march=c64x
  482. CPU_CFLAGS-$(CONFIG_TMS320C64XPLUS) += -march=c64x+
  483. CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-mlittle-endian
  484. CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mbig-endian
  485. CPU_LDFLAGS-y += $(CPU_CFLAGS)
  486. endif
  487. ifeq ($(TARGET_ARCH),arc)
  488. CPU_CFLAGS-y += -mlock -mswape
  489. CPU_CFLAGS-$(CONFIG_ARC_CPU_700) += -mA7
  490. CPU_LDFLAGS-y += $(CPU_CFLAGS) -marclinux
  491. endif
  492. $(eval $(call check-gcc-var,$(PIEFLAG_NAME)))
  493. PIEFLAG := $(CFLAG_$(PIEFLAG_NAME))
  494. ifeq ($(PIEFLAG),)
  495. PIEFLAG := $(PICFLAG)
  496. endif
  497. # We need to keep track of both the CC PIE flag (above) as
  498. # well as the LD PIE flag (below) because we can't rely on
  499. # gcc passing -pie if we used -fPIE. We need to directly use -pie
  500. # instead of -Wl,-pie as gcc picks up the wrong startfile/endfile
  501. $(eval $(call cache-output-var,LDPIEFLAG,$(CC) -Wl$(comma)--help 2>/dev/null | grep -q -- -pie && echo "-pie"))
  502. # Check for --as-needed support in linker
  503. ifndef LD_FLAG_ASNEEDED
  504. _LD_FLAG_ASNEEDED:=$(shell $(CC) -Wl,--help 2>/dev/null | grep -- --as-needed)
  505. ifneq ($(_LD_FLAG_ASNEEDED),)
  506. export LD_FLAG_ASNEEDED:=--as-needed
  507. endif
  508. endif
  509. ifndef LD_FLAG_NO_ASNEEDED
  510. ifdef LD_FLAG_ASNEEDED
  511. export LD_FLAG_NO_ASNEEDED:=--no-as-needed
  512. endif
  513. endif
  514. ifndef CC_FLAG_ASNEEDED
  515. ifdef LD_FLAG_ASNEEDED
  516. export CC_FLAG_ASNEEDED:=-Wl,$(LD_FLAG_ASNEEDED)
  517. endif
  518. endif
  519. ifndef CC_FLAG_NO_ASNEEDED
  520. ifdef LD_FLAG_NO_ASNEEDED
  521. export CC_FLAG_NO_ASNEEDED:=-Wl,$(LD_FLAG_NO_ASNEEDED)
  522. endif
  523. endif
  524. link.asneeded = $(if $(findstring yy,$(CC_FLAG_ASNEEDED)$(CC_FLAG_NO_ASNEEDED)),$(CC_FLAG_ASNEEDED) $(1) $(CC_FLAG_NO_ASNEEDED))
  525. # Check for AS_NEEDED support in linker script (binutils>=2.16.1 has it)
  526. ifndef ASNEEDED
  527. export ASNEEDED:=$(shell $(CC) -Wl,--help 2>/dev/null | grep -q -- --as-needed && echo "AS_NEEDED ( $(UCLIBC_LDSO) )" || echo "$(UCLIBC_LDSO)")
  528. # Only used in installed libc.so linker script
  529. ifeq ($(UCLIBC_HAS_BACKTRACE),y)
  530. ifeq ($(HARDWIRED_ABSPATH),y)
  531. UBACKTRACE_FULL_NAME := $(subst //,/,$(RUNTIME_PREFIX)$(MULTILIB_DIR)/$(UBACKTRACE_DSO))
  532. else
  533. UBACKTRACE_FULL_NAME := $(UBACKTRACE_DSO)
  534. endif
  535. export UBACKTRACE_ASNEEDED:=$(shell $(CC) -Wl,--help 2>/dev/null | grep -q -- --as-needed && \
  536. echo "GROUP ( AS_NEEDED ( $(UBACKTRACE_FULL_NAME) ) )" || \
  537. echo "GROUP ( $(UBACKTRACE_FULL_NAME) )")
  538. else
  539. export UBACKTRACE_ASNEEDED:=""
  540. endif
  541. endif
  542. # Add a bunch of extra pedantic annoyingly strict checks
  543. WARNING_FLAGS = -Wstrict-prototypes -Wstrict-aliasing
  544. ifeq ($(EXTRA_WARNINGS),y)
  545. WARNING_FLAGS += \
  546. -Wformat=2 \
  547. -Wmissing-noreturn \
  548. -Wmissing-format-attribute \
  549. -Wmissing-prototypes \
  550. -Wmissing-declarations \
  551. -Wnested-externs \
  552. -Wnonnull \
  553. -Wold-style-declaration \
  554. -Wold-style-definition \
  555. -Wshadow \
  556. -Wundef
  557. # Works only w/ gcc-3.4 and up, can't be checked for gcc-3.x w/ check_gcc()
  558. WARNING_FLAGS-gcc-4 += -Wdeclaration-after-statement
  559. endif
  560. WARNING_FLAGS += $(WARNING_FLAGS-gcc-$(GCC_MAJOR_VER))
  561. $(foreach w,$(WARNING_FLAGS),$(eval $(call check-gcc-var,$(w))))
  562. XWARNINGS = $(call qstrip,$(WARNINGS)) $(foreach w,$(WARNING_FLAGS),$(CFLAG_$(w)))
  563. CPU_CFLAGS=$(call qstrip,$(CPU_CFLAGS-y))
  564. # Save the tested flag in a single variable and force it to be
  565. # evaluated just once. Then use that computed value.
  566. $(eval $(call check-gcc-var,-fno-stack-protector))
  567. SSP_DISABLE_FLAGS ?= $(CFLAG_-fno-stack-protector)
  568. ifeq ($(UCLIBC_BUILD_SSP),y)
  569. $(eval $(call check-gcc-var,-fno-stack-protector-all))
  570. $(eval $(call check-gcc-var,-fstack-protector))
  571. $(eval $(call check-gcc-var,-fstack-protector-all))
  572. SSP_CFLAGS := $(CFLAG_-fno-stack-protector-all)
  573. SSP_CFLAGS += $(CFLAG_-fstack-protector)
  574. SSP_ALL_CFLAGS ?= $(CFLAG_-fstack-protector-all)
  575. else
  576. SSP_CFLAGS := $(SSP_DISABLE_FLAGS)
  577. endif
  578. # Collect all CFLAGS components
  579. CFLAGS := $(XWARNINGS) $(CPU_CFLAGS) $(SSP_CFLAGS) \
  580. -nostdinc -I$(top_builddir)include \
  581. -I$(top_srcdir)include -include libc-symbols.h \
  582. -I$(top_srcdir)libc/sysdeps/linux/$(TARGET_ARCH) \
  583. -I$(top_srcdir)libc/sysdeps/linux \
  584. -I$(top_srcdir)ldso/ldso/$(TARGET_ARCH) \
  585. -I$(top_srcdir)ldso/include -I.
  586. # We need this to be checked within libc-symbols.h
  587. ifneq ($(HAVE_SHARED),y)
  588. CFLAGS += -DSTATIC
  589. endif
  590. $(eval $(call check-ld-var,--warn-once))
  591. $(eval $(call check-ld-var,--sort-common))
  592. $(eval $(call check-ld-var,--discard-all))
  593. LDFLAGS_NOSTRIP:=$(LDFLAG-fuse-ld) $(CPU_LDFLAGS-y) -shared \
  594. -Wl,--warn-common $(CFLAG_-Wl--warn-once) -Wl,-z,combreloc
  595. # binutils-2.16.1 warns about ignored sections, 2.16.91.0.3 and newer are ok
  596. #$(eval $(call check-ld-var,--gc-sections))
  597. #LDFLAGS_NOSTRIP += $(LDFLAG_--gc-sections)
  598. $(eval $(call check-gcc-var,-fdata-sections))
  599. $(eval $(call check-gcc-var,-ffunction-sections))
  600. ifeq ($(UCLIBC_BUILD_RELRO),y)
  601. LDFLAGS_NOSTRIP+=-Wl,-z,relro
  602. endif
  603. ifeq ($(UCLIBC_BUILD_NOW),y)
  604. LDFLAGS_NOSTRIP+=-Wl,-z,now
  605. endif
  606. ifeq ($(LDSO_GNU_HASH_SUPPORT),y)
  607. # Be sure that binutils support it
  608. $(eval $(call check-ld-var,--hash-style=gnu))
  609. ifeq ($(LDFLAG_--hash-style=gnu),)
  610. ifneq ($(filter-out $(clean_targets) CLEAN_% install_headers headers-y,$(MAKECMDGOALS)),)
  611. $(error Your binutils do not support --hash-style option, while you want to use it)
  612. endif
  613. else
  614. LDFLAGS_NOSTRIP += $(CFLAG_-Wl--hash-style=gnu)
  615. endif
  616. endif
  617. LDFLAGS:=$(LDFLAGS_NOSTRIP) -Wl,-z,defs
  618. ifeq ($(DODEBUG),y)
  619. CFLAGS += -O0 -g3 -DDEBUG
  620. else
  621. CFLAGS += $(OPTIMIZATION)
  622. endif
  623. ifeq ($(DOSTRIP),y)
  624. LDFLAGS += -Wl,-s
  625. else
  626. STRIPTOOL := true -Stripping_disabled
  627. endif
  628. ifeq ($(DOMULTI),y)
  629. # we try to compile all sources at once into an object (IMA), but
  630. # gcc-3.3.x does not support it
  631. # gcc-3.4.x supports it, but does not need and support --combine. though fails on many sources
  632. # gcc-4.0.x supports it, supports the --combine flag, but does not need it
  633. # gcc-4.1(200506xx) supports it, but needs the --combine flag, else libs are useless
  634. ifeq ($(GCC_MAJOR_VER),3)
  635. DOMULTI:=n
  636. else
  637. $(eval $(call check-gcc-var,--combine))
  638. CFLAGS += $(CFLAG_--combine)
  639. endif
  640. else
  641. DOMULTI:=n
  642. endif
  643. ifneq ($(strip $(UCLIBC_EXTRA_CFLAGS)),"")
  644. CFLAGS += $(call qstrip,$(UCLIBC_EXTRA_CFLAGS))
  645. endif
  646. ifneq ($(strip $(UCLIBC_EXTRA_LDFLAGS)),"")
  647. LDFLAGS += $(call qstrip,$(UCLIBC_EXTRA_LDFLAGS))
  648. endif
  649. ifeq ($(UCLIBC_HAS_THREADS),y)
  650. ifeq ($(UCLIBC_HAS_THREADS_NATIVE),y)
  651. PTNAME := nptl
  652. CFLAGS += -DHAVE_FORCED_UNWIND
  653. else
  654. ifeq ($(LINUXTHREADS_OLD),y)
  655. PTNAME := linuxthreads.old
  656. else
  657. PTNAME := linuxthreads
  658. endif
  659. endif
  660. PTDIR := libpthread/$(PTNAME)
  661. # set up system dependencies include dirs (NOTE: order matters!)
  662. ifeq ($(UCLIBC_HAS_THREADS_NATIVE),y)
  663. PTINC:= -I$(top_builddir)$(PTDIR) \
  664. -I$(top_srcdir)$(PTDIR) \
  665. $(if $(TARGET_SUBARCH),-I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH)/$(TARGET_SUBARCH)) \
  666. -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH) \
  667. -I$(top_builddir)$(PTDIR)/sysdeps/$(TARGET_ARCH) \
  668. -I$(top_srcdir)$(PTDIR)/sysdeps/$(TARGET_ARCH) \
  669. -I$(top_builddir)$(PTDIR)/sysdeps/unix/sysv/linux \
  670. -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux \
  671. -I$(top_srcdir)$(PTDIR)/sysdeps/pthread \
  672. -I$(top_srcdir)$(PTDIR)/sysdeps/pthread/bits \
  673. -I$(top_srcdir)$(PTDIR)/sysdeps/generic
  674. #
  675. # Test for TLS if NPTL support was selected.
  676. #
  677. GCC_HAS_TLS=$(shell \
  678. echo "extern __thread int foo;" | $(CC) -o /dev/null -S -xc - 2>&1)
  679. ifneq ($(GCC_HAS_TLS),)
  680. gcc_tls_test_fail:
  681. @echo "####";
  682. @echo "#### Your compiler does not support TLS and you are trying to build uClibc";
  683. @echo "#### with NPTL support. Upgrade your binutils and gcc to versions which";
  684. @echo "#### support TLS for your architecture. Do not contact uClibc maintainers";
  685. @echo "#### about this problem.";
  686. @echo "####";
  687. @echo "#### Exiting...";
  688. @echo "####";
  689. @exit 1;
  690. endif
  691. else
  692. PTINC := \
  693. -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH) \
  694. -I$(top_srcdir)$(PTDIR)/sysdeps/$(TARGET_ARCH) \
  695. -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux \
  696. -I$(top_srcdir)$(PTDIR)/sysdeps/pthread \
  697. -I$(top_srcdir)$(PTDIR) \
  698. -I$(top_srcdir)libpthread
  699. endif
  700. CFLAGS+=$(PTINC)
  701. else
  702. PTNAME :=
  703. PTINC :=
  704. endif
  705. CFLAGS += -I$(top_srcdir)libc/sysdeps/linux/common
  706. #CFLAGS += -iwithprefix include-fixed -iwithprefix include
  707. $(eval $(call cache-output-var,CC_IPREFIX,$(CC) -print-file-name=include))
  708. CC_INC := -isystem $(dir $(CC_IPREFIX))include-fixed -isystem $(CC_IPREFIX)
  709. CFLAGS += $(CC_INC)
  710. CFLAGS += -I$(KERNEL_HEADERS)
  711. ifneq ($(DOASSERTS),y)
  712. CFLAGS+=-DNDEBUG
  713. endif
  714. ifeq ($(SYMBOL_PREFIX),_)
  715. CFLAGS+=-D__UCLIBC_UNDERSCORES__
  716. endif
  717. # Keep the check_as from being needlessly executed
  718. ifeq ($(UCLIBC_BUILD_NOEXECSTACK),y)
  719. $(eval $(call check-as-var,--noexecstack))
  720. endif
  721. ASFLAGS = $(ASFLAG_--noexecstack)
  722. LIBGCC_CFLAGS ?= $(CFLAGS) $(CPU_CFLAGS-y)
  723. $(eval $(call cache-output-var,LIBGCC,$(CC) $(LIBGCC_CFLAGS) -print-libgcc-file-name))
  724. $(eval $(call cache-output-var,LIBGCC_EH,$(CC) $(LIBGCC_CFLAGS) -print-file-name=libgcc_eh.a))
  725. # with -O0 we (e.g. lockf) might end up with references to
  726. # _Unwind_Resume, so pull in gcc_eh in this case..
  727. LIBGCC_DIR:=$(dir $(LIBGCC))
  728. LIBGCC += $(if $(DODEBUG),$(LIBGCC_EH))
  729. # moved from libpthread/linuxthreads
  730. ifeq ($(UCLIBC_CTOR_DTOR),y)
  731. SHARED_START_FILES:=$(top_builddir)lib/crti.o $(LIBGCC_DIR)crtbeginS.o
  732. SHARED_END_FILES:=$(LIBGCC_DIR)crtendS.o $(top_builddir)lib/crtn.o
  733. endif
  734. LOCAL_INSTALL_PATH := $(if $(O),$(O)/)install_dir
  735. PTHREAD_GENERATE_MANGLE ?= -n "s/^.*@@@name@@@\([^@]*\)@@@value@@@[^0-9Xxa-fA-F-]*\([0-9Xxa-fA-F-][0-9Xxa-fA-F-]*\).*@@@end@@@.*\$$/\#define \1 \2/p"