Rules.mak 25 KB

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  1. # Rules.mak for uClibc-ng
  2. #
  3. # Copyright (C) 2000-2008 Erik Andersen <andersen@uclibc.org>
  4. # Copyright (C) 2015-2018 Waldemar Brodkorb <wbx@uclibc-ng.org>
  5. #
  6. # Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
  7. #
  8. # make nano-doc
  9. # FOO = bar -- recursively expanded variable. Value is remebered verbatim.
  10. # If it contains references to other variables, these references
  11. # are expanded whenever this variable is _substituted_.
  12. # FOO := bar -- simply expanded variable. Right hand is expanded when
  13. # the variable is _defined_. Therefore faster than =.
  14. # FOO ?= bar -- set a value only if it is not already set
  15. # (behaves as =, not :=).
  16. # FOO += bar -- append; if FOO is not defined, acts like = (not :=).
  17. # check for proper make version
  18. ifneq ($(findstring x3.7,x$(MAKE_VERSION)),)
  19. $(error Your make is too old $(MAKE_VERSION). Go get at least 3.80)
  20. endif
  21. #-----------------------------------------------------------
  22. # This file contains rules which are shared between multiple
  23. # Makefiles. All normal configuration options live in the
  24. # file named ".config". Don't mess with this file unless
  25. # you know what you are doing.
  26. clean_targets := clean realclean distclean \
  27. objclean-y headers_clean-y CLEAN_utils
  28. noconfig_targets := menuconfig config nconfig \
  29. oldaskconfig silentoldconfig oldconfig allnoconfig allyesconfig \
  30. alldefconfig randconfig defconfig savedefconfig listnewconfig \
  31. olddefconfig \
  32. xconfig gconfig update-po-config mconf qconf gconf nconf conf \
  33. release dist tags help
  34. #-----------------------------------------------------------
  35. # If you are running a cross compiler, you will want to set
  36. # 'CROSS_COMPILE' to something more interesting ... Target
  37. # architecture is determined by asking the CC compiler what
  38. # arch it compiles things for, so unless your compiler is
  39. # broken, you should not need to specify TARGET_ARCH.
  40. #
  41. # Most people will set this stuff on the command line, i.e.
  42. # make CROSS_COMPILE=arm-linux-
  43. # will build uClibc-ng for 'arm'.
  44. # CROSS is still supported for backward compatibily only
  45. CROSS_COMPILE ?= $(CROSS)
  46. CC = $(CROSS_COMPILE)gcc
  47. AR = $(CROSS_COMPILE)ar
  48. LD = $(CROSS_COMPILE)ld
  49. NM = $(CROSS_COMPILE)nm
  50. OBJDUMP = $(CROSS_COMPILE)objdump
  51. STRIPTOOL = $(CROSS_COMPILE)strip
  52. INSTALL = install
  53. LN = ln
  54. RM = rm -f
  55. TAR = tar
  56. SED = sed
  57. AWK = awk
  58. STRIP_FLAGS ?= -x -R .note -R .comment
  59. # Select the compiler needed to build binaries for your development system
  60. HOSTCC = gcc
  61. BUILD_CFLAGS = -Os
  62. #---------------------------------------------------------
  63. # Nothing beyond this point should ever be touched by mere
  64. # mortals. Unless you hang out with the gods, you should
  65. # probably leave all this stuff alone.
  66. # strip quotes
  67. qstrip = $(strip $(subst ",,$(1)))
  68. #"))
  69. # kconfig stuff
  70. KCONFIG_CONFIG ?= $(top_builddir).config
  71. KCONFIG_CONFIG := $(abspath $(KCONFIG_CONFIG))
  72. export KCONFIG_CONFIG
  73. KCONFIG_AUTOCONFIG := $(dir $(KCONFIG_CONFIG))include/config/auto.conf
  74. export KCONFIG_AUTOCONFIG
  75. KCONFIG_TRISTATE := $(dir $(KCONFIG_CONFIG))include/config/tristate.conf
  76. export KCONFIG_TRISTATE
  77. srctree := $(abspath $(top_srcdir))
  78. export srctree
  79. KCONFIG_AUTOHEADER := $(dir $(KCONFIG_CONFIG))include/generated/autoconf.h
  80. export KCONFIG_AUTOHEADER
  81. Kconfig := $(abspath $(top_srcdir)extra/Configs/Config.in)
  82. # Pull in the user's uClibc-ng configuration
  83. ifeq ($(filter $(noconfig_targets) clean CLEAN_%,$(MAKECMDGOALS)),)
  84. -include $(KCONFIG_CONFIG)
  85. endif
  86. TARGET_ARCH:=$(call qstrip,$(TARGET_ARCH))
  87. ifeq ($(TARGET_ARCH),)
  88. ARCH ?= $(shell uname -m | $(SED) -e s/i.86/i386/ \
  89. -e s/sun.*/sparc/ -e s/sparc.*/sparc/ \
  90. -e s/arm.*/arm/ -e s/sa110/arm/ \
  91. -e s/nds32.*/nds32/ \
  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 := 1
  110. MINOR_VERSION := 0
  111. SUBLEVEL := 31
  112. EXTRAVERSION :=
  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. UCLIBC_LDSO_NAME := ld-uClibc
  124. ARCH_NATIVE_BIT := 32
  125. ifneq ($(findstring $(TARGET_ARCH) , hppa64 ia64 powerpc64 s390x sparc64 x86_64 ),)
  126. UCLIBC_LDSO_NAME := ld64-uClibc
  127. ARCH_NATIVE_BIT := 64
  128. else
  129. ifeq ($(CONFIG_MIPS_N64_ABI),y)
  130. UCLIBC_LDSO_NAME := ld64-uClibc
  131. ARCH_NATIVE_BIT := 64
  132. endif
  133. endif
  134. UCLIBC_LDSO := $(UCLIBC_LDSO_NAME).so.$(ABI_VERSION)
  135. NONSHARED_LIBNAME := uclibc_nonshared.a
  136. NONSHARED_LIBPTHREAD := libpthread_nonshared.a
  137. libc := $(top_builddir)lib/$(SHARED_LIBNAME)
  138. libc.depend := $(top_builddir)lib/$(SHARED_LIBNAME:.$(ABI_VERSION)=)
  139. interp := $(top_builddir)lib/interp.os
  140. ldso := $(top_builddir)lib/$(UCLIBC_LDSO)
  141. headers_dep := $(top_builddir)include/bits/sysnum.h \
  142. $(top_builddir)include/bits/uClibc_config.h
  143. sub_headers := $(headers_dep)
  144. LIBS := $(interp) -L$(top_builddir)lib $(libc:.$(ABI_VERSION)=)
  145. # Make sure DESTDIR and PREFIX can be used to install
  146. # PREFIX is a uClibcism while DESTDIR is a common GNUism
  147. ifndef PREFIX
  148. PREFIX = $(DESTDIR)
  149. endif
  150. ifneq ($(HAVE_SHARED),y)
  151. libc :=
  152. interp :=
  153. ldso :=
  154. endif
  155. comma:=,
  156. space:= #
  157. ifeq ($(CROSS_COMPILE),)
  158. CROSS_COMPILE=$(call qstrip,$(CROSS_COMPILER_PREFIX))
  159. endif
  160. # A nifty macro to make testing gcc features easier
  161. check_gcc=$(shell \
  162. if $(CC) $(1) -S -o /dev/null -xc /dev/null > /dev/null 2>&1; \
  163. then echo "$(1)"; else echo "$(2)"; fi)
  164. check_as=$(shell \
  165. if $(CC) -Wa,$(1) -Wa,-Z -c -o /dev/null -xassembler /dev/null > /dev/null 2>&1; \
  166. then echo "-Wa,$(1)"; fi)
  167. check_ld=$(shell \
  168. tf="/tmp/clducl$$$$.c"; echo "int _start(){return 0;}int main(){return 0;}" >$$tf; \
  169. if $(CC) $(LDFLAG-fuse-ld) $(CFLAG_-Wl--no-warn-mismatch) -Wl,$(1) $(CFLAG_-nostdlib) -o /dev/null $$tf > /dev/null 2>&1; \
  170. then echo "$(1)"; fi; rm -f $$tf )
  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. # Note: The check for -nostdlib has to be before all calls to check_ld
  216. $(eval $(call check-gcc-var,-nostdlib))
  217. $(eval $(call check-gcc-var,-nostartfiles))
  218. # deliberately not named CFLAG-fuse-ld since unchecked and from user
  219. LDFLAG-fuse-ld := $(filter -fuse-ld=%,$(call qstrip,$(UCLIBC_EXTRA_CFLAGS)))
  220. # failed to merge target specific data of file /dev/null
  221. # Could use -Wl,--script,$(top_srcdir)extra/scripts/none.lds as well.
  222. $(eval $(call check-ld-var,--no-warn-mismatch))
  223. $(eval $(call cache-output-var,GCC_VER,$(CC) -dumpversion))
  224. GCC_VER := $(subst ., ,$(GCC_VER))
  225. GCC_MAJOR_VER ?= $(word 1,$(GCC_VER))
  226. GCC_MINOR_VER ?= $(word 2,$(GCC_VER))
  227. # Flags in OPTIMIZATION are used only for non-debug builds
  228. OPTIMIZATION:=
  229. OPTIMIZATION-$(GCC_MAJOR_VER):=
  230. OPTIMIZATION-$(GCC_MAJOR_VER).$(GCC_MINOR_VER):=
  231. # Use '-Os' optimization if available, else use -O2, allow Config to override
  232. $(eval $(call check-gcc-var,-Os))
  233. ifneq ($(CFLAG_-Os),)
  234. OPTIMIZATION += $(CFLAG_-Os)
  235. else
  236. $(eval $(call check-gcc-var,-O2))
  237. OPTIMIZATION += $(CFLAG_-O2)
  238. endif
  239. # Use the gcc 3.4 -funit-at-a-time optimization when available
  240. $(eval $(call check-gcc-var,-funit-at-a-time))
  241. OPTIMIZATION-3.4 += $(CFLAG_-funit-at-a-time)
  242. $(eval $(call check-gcc-var,-fstrict-aliasing))
  243. OPTIMIZATION += $(CFLAG_-fstrict-aliasing)
  244. # CPU_CFLAGS-y contain options which are not warnings,
  245. # not include or library paths, and not optimizations.
  246. # Why -funsigned-char: I hunted a bug related to incorrect
  247. # sign extension of 'char' type for 10 hours straight. Not fun.
  248. CPU_CFLAGS-y := -funsigned-char -fno-builtin
  249. $(eval $(call check-gcc-var,-fno-asm))
  250. CPU_CFLAGS-y += $(CFLAG_-fno-asm)
  251. $(eval $(call check-gcc-var,-fmerge-all-constants))
  252. CPU_CFLAGS-y += $(CFLAG_-fmerge-all-constants)
  253. ifeq ($(UCLIBC_HAS_SOFT_FLOAT),y)
  254. ifneq ($(TARGET_ARCH),bfin)
  255. ifneq ($(TARGET_ARCH),lm32)
  256. ifneq ($(TARGET_ARCH),nios2)
  257. ifneq ($(TARGET_ARCH),nds32)
  258. ifneq ($(TARGET_ARCH),sh)
  259. ifneq ($(TARGET_ARCH),c6x)
  260. ifneq ($(TARGET_ARCH),h8300)
  261. ifneq ($(TARGET_ARCH),arc)
  262. ifneq ($(TARGET_ARCH),aarch64)
  263. CPU_CFLAGS-y += -msoft-float
  264. endif
  265. endif
  266. endif
  267. endif
  268. endif
  269. endif
  270. endif
  271. endif
  272. endif
  273. endif
  274. ifeq ($(TARGET_ARCH),aarch64)
  275. CPU_CFLAGS-y += -ftls-model=initial-exec
  276. endif
  277. $(eval $(call check-gcc-var,-std=gnu99))
  278. CPU_CFLAGS-y += $(CFLAG_-std=gnu99)
  279. CPU_CFLAGS-$(UCLIBC_FORMAT_SHARED_FLAT) += -mid-shared-library
  280. CPU_CFLAGS-$(UCLIBC_FORMAT_FLAT_SEP_DATA) += -msep-data
  281. CPU_LDFLAGS-$(ARCH_LITTLE_ENDIAN) += -Wl,-EL
  282. CPU_LDFLAGS-$(ARCH_BIG_ENDIAN) += -Wl,-EB
  283. PICFLAG-y := -fPIC
  284. PICFLAG-$(UCLIBC_FORMAT_FDPIC_ELF) := -mfdpic
  285. PICFLAG-$(UCLIBC_FORMAT_DSBT_ELF) := -mdsbt -fpic
  286. PICFLAG := $(PICFLAG-y)
  287. PIEFLAG_NAME:=-fPIE
  288. $(eval $(call check-gcc-var,-fdata-sections))
  289. $(eval $(call check-gcc-var,-ffunction-sections))
  290. # Some nice CPU specific optimizations
  291. ifeq ($(TARGET_ARCH),i386)
  292. $(eval $(call check-gcc-var,-fomit-frame-pointer))
  293. OPTIMIZATION += $(CFLAG_-fomit-frame-pointer)
  294. ifeq ($(CONFIG_386)$(CONFIG_486)$(CONFIG_586),y)
  295. # TODO: Change this to a gcc version check. This bug
  296. # should be fixed with at least gcc-4.3.
  297. # Non-SSE capable processor.
  298. # NB: this may make SSE insns segfault!
  299. # -O1 -march=pentium3, -Os -msse etc are known to be affected.
  300. # See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13685
  301. # -m32 is needed if host is 64-bit
  302. OPTIMIZATION+=$(call check_gcc,-m32 -mpreferred-stack-boundary=2,)
  303. else
  304. $(eval $(call check-gcc-var,-mpreferred-stack-boundary=4))
  305. OPTIMIZATION += $(CFLAG_-mpreferred-stack-boundary=4)
  306. endif
  307. # Choice of alignment (please document why!)
  308. # -falign-labels: in-line labels
  309. # (reachable by normal code flow, aligning will insert nops
  310. # which will be executed - may even make things slower)
  311. # -falign-jumps: reachable only by a jump
  312. # Generic: no alignment at all (smallest code)
  313. GCC_FALIGN=$(call check_gcc,-falign-functions=1 -falign-jumps=1 -falign-labels=1 -falign-loops=1,-malign-jumps=1 -malign-loops=1)
  314. OPTIMIZATION+=$(GCC_FALIGN)
  315. # Putting each function and data object into its own section
  316. # allows for kbytes of less text if users link against static uclibc
  317. # using ld --gc-sections.
  318. # ld 2.18 can't do that (yet?) for shared libraries, so we itself
  319. # do not use --gc-sections at shared lib link time.
  320. # However, in combination with sections being sorted by alignment
  321. # it does result in much reduced padding:
  322. # text data bss dec hex
  323. # 235319 1472 5992 242783 3b45f old.so
  324. # 234104 1472 5980 241556 3af94 new.so
  325. # Without -ffunction-sections, all functions will get aligned
  326. # to 4 byte boundary by as/ld. This is arguably a bug in as.
  327. # It specifies 4 byte align for .text even if not told to do so:
  328. # Idx Name Size VMA LMA File off Algn
  329. # 0 .text xxxxxxxx 00000000 00000000 xxxxxxxx 2**2 <===!
  330. CPU_CFLAGS-y += $(CFLAG_-ffunction-sections) $(CFLAG_-fdata-sections)
  331. CPU_LDFLAGS-y += $(CFLAG_-Wl--sort-common)
  332. $(eval $(call check-ld-var,--sort-section=alignment))
  333. CPU_LDFLAGS-y += $(CFLAG_-Wl--sort-section=alignment)
  334. CPU_LDFLAGS-y+=-m32
  335. CPU_CFLAGS-y+=-m32
  336. endif
  337. ifeq ($(TARGET_ARCH),sparc)
  338. CPU_CFLAGS-$(CONFIG_SPARC_V7)+=-mcpu=v7
  339. CPU_CFLAGS-$(CONFIG_SPARC_V8)+=-mcpu=v8
  340. CPU_CFLAGS-$(CONFIG_SPARC_V9)+=-mcpu=v9
  341. CPU_CFLAGS-$(CONFIG_SPARC_V9B)+=$(call check_gcc,-mcpu=v9b,-mcpu=ultrasparc)
  342. endif
  343. ifeq ($(TARGET_ARCH),arm)
  344. CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-mlittle-endian
  345. CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mbig-endian
  346. endif
  347. ifeq ($(TARGET_ARCH),metag)
  348. SYMBOL_PREFIX=_
  349. CPU_CFLAGS-$(CONFIG_META_1_2)+=
  350. CPU_CFLAGS-$(CONFIG_META_2_1)+=-Wa,-mcpu=metac21
  351. endif
  352. ifeq ($(TARGET_ARCH),mips)
  353. OPTIMIZATION+=-mno-split-addresses
  354. CPU_CFLAGS-$(CONFIG_MIPS_N64_ABI)+=-mabi=64
  355. CPU_CFLAGS-$(CONFIG_MIPS_O32_ABI)+=-mabi=32
  356. CPU_CFLAGS-$(CONFIG_MIPS_N32_ABI)+=-mabi=n32
  357. CPU_CFLAGS-$(CONFIG_MIPS_NAN_LEGACY)+=$(call check_gcc,-mnan=legacy)
  358. CPU_CFLAGS-$(CONFIG_MIPS_NAN_2008)+=$(call check_gcc,-mnan=2008)
  359. CPU_LDFLAGS-y += $(CPU_CFLAGS)
  360. endif
  361. ifeq ($(TARGET_ARCH),nds32)
  362. CPU_CFLAGS-$(CONFIG_NDS32_ISA)+=-march=nds32
  363. CFLAGS-.os+= -DPIC
  364. CFLAGS-.oS+= -DPIC
  365. endif
  366. ifeq ($(TARGET_ARCH),sh)
  367. $(eval $(call check-gcc-var,-mprefergot))
  368. OPTIMIZATION += $(CFLAG_-mprefergot)
  369. CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-ml
  370. CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mb
  371. CPU_CFLAGS-$(CONFIG_SH2)+=-m2
  372. CPU_CFLAGS-$(CONFIG_SH3)+=-m3
  373. ifeq ($(UCLIBC_HAS_FPU),y)
  374. CPU_CFLAGS-$(CONFIG_SH2A)+=-m2a
  375. CPU_CFLAGS-$(CONFIG_SH4)+=-m4
  376. CPU_CFLAGS-$(CONFIG_SH4A)+=-m4a
  377. else
  378. CPU_CFLAGS-$(CONFIG_SH2A)+=-m2a-nofpu
  379. CPU_CFLAGS-$(CONFIG_SH4)+=-m4-nofpu
  380. CPU_CFLAGS-$(CONFIG_SH4A)+=-m4a-nofpu
  381. endif
  382. endif
  383. ifeq ($(TARGET_ARCH),h8300)
  384. CPU_CFLAGS-$(CONFIG_H8300H) += -mh -mint32
  385. CPU_CFLAGS-$(CONFIG_H8S) += -ms -mint32
  386. endif
  387. ifeq ($(TARGET_ARCH),cris)
  388. CPU_LDFLAGS-$(CONFIG_CRIS)+=-Wl,-mcrislinux
  389. CPU_LDFLAGS-$(CONFIG_CRISV32)+=-Wl,-mcrislinux
  390. CPU_CFLAGS-$(CONFIG_CRIS)+=-mlinux
  391. PICFLAG:=-fpic
  392. PIEFLAG_NAME:=-fpie
  393. endif
  394. ifeq ($(TARGET_ARCH),csky)
  395. # In csky gas implement, we use $t and $d to detect .text or literal pool.
  396. # So we couldn't strip them for objdump.
  397. STRIP_FLAGS += -K "$$"t -K "$$"d
  398. CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN) += -mlittle-endian
  399. CPU_CFLAGS-$(ARCH_BIG_ENDIAN) += -mbig-endian
  400. endif
  401. ifeq ($(TARGET_ARCH),m68k)
  402. # -fPIC is only supported for 68020 and above. It is not supported
  403. # for 68000, 68010, or Coldfire.
  404. PICFLAG:=-fpic
  405. PIEFLAG_NAME:=-fpie
  406. endif
  407. ifeq ($(TARGET_ARCH),powerpc)
  408. # PowerPC can hold 8192 entries in its GOT with -fpic which is more than
  409. # enough. Therefore use -fpic which will reduce code size and generates
  410. # faster code.
  411. PICFLAG:=-fpic
  412. PIEFLAG_NAME:=-fpie
  413. PPC_HAS_REL16:=$(shell printf "\t.text\n\taddis 11,30,_GLOBAL_OFFSET_TABLE_-.@ha\n" | $(CC) -c -x assembler -o /dev/null - 2> /dev/null && echo -n y || echo -n n)
  414. CPU_CFLAGS-$(PPC_HAS_REL16)+= -DHAVE_ASM_PPC_REL16
  415. CPU_CFLAGS-$(CONFIG_E500) += "-D__NO_MATH_INLINES"
  416. endif
  417. ifeq ($(TARGET_ARCH),bfin)
  418. SYMBOL_PREFIX=_
  419. ifeq ($(UCLIBC_FORMAT_FDPIC_ELF),y)
  420. CPU_CFLAGS-y:=-mfdpic
  421. CPU_LDFLAGS-y += -Wl,-melf32bfinfd
  422. PICFLAG:=-fpic
  423. PIEFLAG_NAME:=-fpie
  424. endif
  425. ifeq ($(UCLIBC_FORMAT_SHARED_FLAT),y)
  426. PICFLAG := -mleaf-id-shared-library
  427. endif
  428. endif
  429. ifeq ($(TARGET_ARCH),frv)
  430. # Using -pie causes the program to have an interpreter, which is
  431. # forbidden, so we must make do with -shared. Unfortunately,
  432. # -shared by itself would get us global function descriptors
  433. # and calls through PLTs, dynamic resolution of symbols, etc,
  434. # which would break as well, but -Bsymbolic comes to the rescue.
  435. CPU_LDFLAGS-y += -Wl,-melf32frvfd -Wl,-Bsymbolic
  436. endif
  437. ifeq ($(strip $(TARGET_ARCH)),avr32)
  438. CPU_CFLAGS-$(CONFIG_AVR32_AP7) += -march=ap
  439. CPU_CFLAGS-$(CONFIG_LINKRELAX) += -mrelax
  440. CPU_LDFLAGS-$(CONFIG_LINKRELAX) += --relax
  441. endif
  442. ifeq ($(TARGET_ARCH),c6x)
  443. PIEFLAG:=
  444. CPU_CFLAGS-$(CONFIG_TMS320C64X) += -march=c64x
  445. CPU_CFLAGS-$(CONFIG_TMS320C64XPLUS) += -march=c64x+
  446. CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-mlittle-endian
  447. CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mbig-endian
  448. CPU_LDFLAGS-y += $(CPU_CFLAGS)
  449. endif
  450. $(eval $(call check-gcc-var,$(PIEFLAG_NAME)))
  451. PIEFLAG := $(CFLAG_$(PIEFLAG_NAME))
  452. ifeq ($(PIEFLAG),)
  453. PIEFLAG := $(PICFLAG)
  454. endif
  455. # We need to keep track of both the CC PIE flag (above) as
  456. # well as the LD PIE flag (below) because we can't rely on
  457. # gcc passing -pie if we used -fPIE. We need to directly use -pie
  458. # instead of -Wl,-pie as gcc picks up the wrong startfile/endfile
  459. $(eval $(call cache-output-var,LDPIEFLAG,$(CC) -Wl$(comma)--help 2>/dev/null | grep -q -- -pie && echo "-pie"))
  460. # Check for --as-needed support in linker
  461. ifndef LD_FLAG_ASNEEDED
  462. _LD_FLAG_ASNEEDED:=$(shell $(CC) -Wl,--help 2>/dev/null | grep -- --as-needed)
  463. ifneq ($(_LD_FLAG_ASNEEDED),)
  464. export LD_FLAG_ASNEEDED:=--as-needed
  465. endif
  466. endif
  467. ifndef LD_FLAG_NO_ASNEEDED
  468. ifdef LD_FLAG_ASNEEDED
  469. export LD_FLAG_NO_ASNEEDED:=--no-as-needed
  470. endif
  471. endif
  472. ifndef CC_FLAG_ASNEEDED
  473. ifdef LD_FLAG_ASNEEDED
  474. export CC_FLAG_ASNEEDED:=-Wl,$(LD_FLAG_ASNEEDED)
  475. endif
  476. endif
  477. ifndef CC_FLAG_NO_ASNEEDED
  478. ifdef LD_FLAG_NO_ASNEEDED
  479. export CC_FLAG_NO_ASNEEDED:=-Wl,$(LD_FLAG_NO_ASNEEDED)
  480. endif
  481. endif
  482. link.asneeded = $(if $(CC_FLAG_ASNEEDED),$(if $(CC_FLAG_NO_ASNEEDED),$(CC_FLAG_ASNEEDED) $(1) $(CC_FLAG_NO_ASNEEDED)))
  483. # Check for AS_NEEDED support in linker script (binutils>=2.16.1 has it)
  484. ifndef ASNEEDED
  485. export ASNEEDED:=$(shell $(CC) -Wl,--help 2>/dev/null | grep -q -- --as-needed && echo "AS_NEEDED ( $(UCLIBC_LDSO) )" || echo "$(UCLIBC_LDSO)")
  486. endif
  487. # Add a bunch of extra pedantic annoyingly strict checks
  488. WARNING_FLAGS = -Wstrict-prototypes -Wstrict-aliasing -Wno-nonnull-compare
  489. ifeq ($(EXTRA_WARNINGS),y)
  490. WARNING_FLAGS += \
  491. -Wnonnull-compare \
  492. -Wnodeclaration-after-statement \
  493. -Wformat=2 \
  494. -Wmissing-noreturn \
  495. -Wmissing-format-attribute \
  496. -Wmissing-prototypes \
  497. -Wmissing-declarations \
  498. -Wnested-externs \
  499. -Wnonnull \
  500. -Wold-style-declaration \
  501. -Wold-style-definition \
  502. -Wshadow \
  503. -Wundef
  504. endif
  505. WARNING_FLAGS += $(WARNING_FLAGS-gcc-$(GCC_MAJOR_VER))
  506. $(foreach w,$(WARNING_FLAGS),$(eval $(call check-gcc-var,$(w))))
  507. XWARNINGS = $(call qstrip,$(WARNINGS)) $(foreach w,$(WARNING_FLAGS),$(CFLAG_$(w)))
  508. CPU_CFLAGS=$(call qstrip,$(CPU_CFLAGS-y))
  509. # Save the tested flag in a single variable and force it to be
  510. # evaluated just once. Then use that computed value.
  511. $(eval $(call check-gcc-var,-fno-stack-protector))
  512. SSP_DISABLE_FLAGS ?= $(CFLAG_-fno-stack-protector)
  513. ifeq ($(UCLIBC_BUILD_SSP),y)
  514. $(eval $(call check-gcc-var,-fno-stack-protector-all))
  515. $(eval $(call check-gcc-var,-fstack-protector))
  516. $(eval $(call check-gcc-var,-fstack-protector-all))
  517. SSP_CFLAGS := $(CFLAG_-fno-stack-protector-all)
  518. SSP_CFLAGS += $(CFLAG_-fstack-protector)
  519. SSP_ALL_CFLAGS ?= $(CFLAG_-fstack-protector-all)
  520. else
  521. SSP_CFLAGS := $(SSP_DISABLE_FLAGS)
  522. endif
  523. # Collect all CFLAGS components
  524. CFLAGS := $(XWARNINGS) $(CPU_CFLAGS) $(SSP_CFLAGS) \
  525. -nostdinc -I$(top_builddir)include \
  526. -I$(top_srcdir)include -include libc-symbols.h \
  527. -I$(top_srcdir)libc/sysdeps/linux/$(TARGET_ARCH) \
  528. -I$(top_srcdir)libc/sysdeps/linux \
  529. -I$(top_srcdir)ldso/ldso/$(TARGET_ARCH) \
  530. -I$(top_srcdir)ldso/include -I.
  531. # We need this to be checked within libc-symbols.h
  532. ifneq ($(HAVE_SHARED),y)
  533. CFLAGS += -DSTATIC
  534. endif
  535. $(eval $(call check-ld-var,--warn-once))
  536. $(eval $(call check-ld-var,--sort-common))
  537. $(eval $(call check-ld-var,--discard-all))
  538. LDFLAGS_NOSTRIP:=$(LDFLAG-fuse-ld) $(CPU_LDFLAGS-y) -shared \
  539. -Wl,--warn-common $(CFLAG_-Wl--warn-once) -Wl,-z,combreloc
  540. ifeq ($(UCLIBC_BUILD_RELRO),y)
  541. LDFLAGS_NOSTRIP+=-Wl,-z,relro
  542. endif
  543. ifeq ($(UCLIBC_BUILD_NOW),y)
  544. LDFLAGS_NOSTRIP+=-Wl,-z,now
  545. endif
  546. ifeq ($(LDSO_GNU_HASH_SUPPORT),y)
  547. # Be sure that binutils support it
  548. $(eval $(call check-ld-var,--hash-style=gnu))
  549. ifeq ($(LDFLAG_--hash-style=gnu),)
  550. ifneq ($(filter-out $(clean_targets) CLEAN_% install_headers headers-y,$(MAKECMDGOALS)),)
  551. $(error Your binutils do not support --hash-style option, while you want to use it)
  552. endif
  553. else
  554. LDFLAGS_NOSTRIP += $(CFLAG_-Wl--hash-style=gnu)
  555. endif
  556. endif
  557. ifeq ($(DODEBUG),y)
  558. CFLAGS += -O0 -g3 -DDEBUG
  559. else
  560. CFLAGS += $(OPTIMIZATION)
  561. CFLAGS += $(OPTIMIZATION-$(GCC_MAJOR_VER))
  562. CFLAGS += $(OPTIMIZATION-$(GCC_MAJOR_VER).$(GCC_MINOR_VER))
  563. $(eval $(call check-ld-var,-O2))
  564. LDFLAGS_NOSTRIP += $(CFLAG_-Wl-O2)
  565. endif
  566. LDFLAGS:=$(LDFLAGS_NOSTRIP) -Wl,-z,defs
  567. ifeq ($(DOSTRIP),y)
  568. LDFLAGS += -Wl,-s
  569. else
  570. STRIPTOOL := true -Stripping_disabled
  571. endif
  572. ifneq ($(strip $(UCLIBC_EXTRA_CFLAGS)),"")
  573. CFLAGS += $(call qstrip,$(UCLIBC_EXTRA_CFLAGS))
  574. endif
  575. ifneq ($(strip $(UCLIBC_EXTRA_LDFLAGS)),"")
  576. LDFLAGS += $(call qstrip,$(UCLIBC_EXTRA_LDFLAGS))
  577. endif
  578. ifeq ($(UCLIBC_HAS_STDIO_FUTEXES),y)
  579. CFLAGS += -D__USE_STDIO_FUTEXES__
  580. endif
  581. ifeq ($(UCLIBC_HAS_THREADS),y)
  582. ifeq ($(UCLIBC_HAS_THREADS_NATIVE),y)
  583. PTNAME := nptl
  584. CFLAGS += -DHAVE_FORCED_UNWIND -D_LIBC_REENTRANT
  585. else
  586. ifeq ($(UCLIBC_HAS_LINUXTHREADS),y)
  587. PTNAME := linuxthreads
  588. endif
  589. endif
  590. PTDIR := libpthread/$(PTNAME)
  591. # set up system dependencies include dirs (NOTE: order matters!)
  592. ifeq ($(UCLIBC_HAS_THREADS_NATIVE),y)
  593. PTINC:= -I$(top_builddir)$(PTDIR) \
  594. -I$(top_srcdir)$(PTDIR) \
  595. $(if $(TARGET_SUBARCH),-I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH)/$(TARGET_SUBARCH)) \
  596. -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH) \
  597. -I$(top_builddir)$(PTDIR)/sysdeps/$(TARGET_ARCH) \
  598. -I$(top_srcdir)$(PTDIR)/sysdeps/$(TARGET_ARCH) \
  599. -I$(top_builddir)$(PTDIR)/sysdeps/unix/sysv/linux \
  600. -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux \
  601. -I$(top_srcdir)$(PTDIR)/sysdeps/pthread \
  602. -I$(top_srcdir)$(PTDIR)/sysdeps/pthread/bits \
  603. -I$(top_srcdir)$(PTDIR)/sysdeps/generic
  604. #
  605. # Test for TLS if NPTL support was selected.
  606. #
  607. GCC_HAS_TLS=$(shell \
  608. echo "extern __thread int foo;" | $(CC) -o /dev/null -S -xc - 2>&1)
  609. ifneq ($(GCC_HAS_TLS),)
  610. gcc_tls_test_fail:
  611. @echo "####";
  612. @echo "#### Your compiler does not support TLS and you are trying to build uClibc-ng";
  613. @echo "#### with NPTL support. Upgrade your binutils and gcc to versions which";
  614. @echo "#### support TLS for your architecture. Do not contact uClibc-ng maintainers";
  615. @echo "#### about this problem.";
  616. @echo "####";
  617. @echo "#### Exiting...";
  618. @echo "####";
  619. @exit 1;
  620. endif
  621. else
  622. PTINC := \
  623. -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH) \
  624. -I$(top_srcdir)$(PTDIR)/sysdeps/$(TARGET_ARCH) \
  625. -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux \
  626. -I$(top_srcdir)$(PTDIR)/sysdeps/pthread \
  627. -I$(top_srcdir)$(PTDIR) \
  628. -I$(top_srcdir)libpthread
  629. endif
  630. CFLAGS+=$(PTINC)
  631. else
  632. PTNAME :=
  633. PTINC :=
  634. endif
  635. CFLAGS += -I$(top_srcdir)libc/sysdeps/linux/common
  636. #CFLAGS += -iwithprefix include-fixed -iwithprefix include
  637. $(eval $(call cache-output-var,CC_IPREFIX,$(CC) -print-file-name=include))
  638. CC_INC := -isystem $(dir $(CC_IPREFIX))include-fixed -isystem $(CC_IPREFIX)
  639. CFLAGS += $(CC_INC)
  640. CFLAGS += -I$(KERNEL_HEADERS)
  641. ifneq ($(DOASSERTS),y)
  642. CFLAGS+=-DNDEBUG
  643. endif
  644. ifeq ($(SYMBOL_PREFIX),_)
  645. CFLAGS+=-D__UCLIBC_UNDERSCORES__
  646. endif
  647. # Keep the check_as from being needlessly executed
  648. ifeq ($(UCLIBC_BUILD_NOEXECSTACK),y)
  649. $(eval $(call check-as-var,--noexecstack))
  650. endif
  651. ASFLAGS += $(ASFLAG_--noexecstack)
  652. LIBGCC_CFLAGS ?= $(CFLAGS) $(CPU_CFLAGS-y)
  653. $(eval $(call cache-output-var,LIBGCC_A,$(CC) $(LIBGCC_CFLAGS) -print-libgcc-file-name))
  654. $(eval $(call cache-output-var,LIBGCC_EH,$(CC) $(LIBGCC_CFLAGS) -print-file-name=libgcc_eh.a))
  655. # with -O0 we (e.g. lockf) might end up with references to
  656. # _Unwind_Resume, so pull in gcc_eh in this case..
  657. # with a --disable-shared toolchain, libgcc_eh.a and libgcc.a are combined
  658. # in libgcc.a, so check if the printed file exist, before adding to the commandline
  659. LIBGCC_EH_FILE := $(shell if [ -f $(LIBGCC_EH) ]; then echo $(LIBGCC_EH); fi)
  660. LIBGCC_DIR := $(dir $(LIBGCC_A))
  661. LIBGCC := $(LIBGCC_A) $(if $(DODEBUG),$(LIBGCC_EH_FILE))
  662. # moved from libpthread/linuxthreads
  663. ifeq ($(UCLIBC_CTOR_DTOR),y)
  664. SHARED_START_FILES:=$(top_builddir)lib/crti.o $(LIBGCC_DIR)crtbeginS.o
  665. SHARED_END_FILES:=$(LIBGCC_DIR)crtendS.o $(top_builddir)lib/crtn.o
  666. endif
  667. LOCAL_INSTALL_PATH := $(if $(O),$(O)/)install_dir
  668. PTHREAD_GENERATE_MANGLE ?= -n "s/^.*@@@name@@@\([^@]*\)@@@value@@@[^0-9Xxa-fA-F-]*\([0-9Xxa-fA-F-][0-9Xxa-fA-F-]*\).*@@@end@@@.*\$$/\#define \1 \2/p"