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 := 34
  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. tf="/tmp/cgccucl$$$$.o"; \
  163. if $(CC) $(1) -S -o $$tf -xc /dev/null > /dev/null 2>&1; \
  164. then echo "$(1)"; else echo "$(2)"; fi; rm -f $$tf )
  165. check_as=$(shell \
  166. tf="/tmp/casucl$$$$.o"; \
  167. if $(CC) -Wa,$(1) -Wa,-Z -c -o $$tf -xassembler /dev/null > /dev/null 2>&1; \
  168. then echo "-Wa,$(1)"; fi; rm -f $$tf )
  169. check_ld=$(shell \
  170. tf="/tmp/clducl$$$$.c"; echo "int _start(){return 0;}int main(){return 0;}" >$$tf; \
  171. if $(CC) $(LDFLAG-fuse-ld) $(CFLAG_-Wl--no-warn-mismatch) -Wl,$(1) $(CFLAG_-nostdlib) -o /dev/null $$tf > /dev/null 2>&1; \
  172. then echo "$(1)"; fi; rm -f $$tf )
  173. # Use variable indirection here so that we can have variable
  174. # names with fun chars in them like equal signs
  175. define check-tool-var
  176. ifeq ($(filter $(clean_targets) CLEAN_%,$(MAKECMDGOALS)),)
  177. _v = $(2)_$(3)
  178. ifndef $$(_v)
  179. $$(_v) := $$(call $(1),$(subst %, ,$(3)))
  180. export $$(_v)
  181. endif
  182. endif
  183. endef
  184. # Usage: check-gcc-var,<flag>
  185. # Check the C compiler to see if it supports <flag>.
  186. # Export the variable CFLAG_<flag> if it does.
  187. define check-gcc-var
  188. $(call check-tool-var,check_gcc,CFLAG,$(1))
  189. endef
  190. # Usage: check-as-var,<flag>
  191. # Check the assembler to see if it supports <flag>. Export the
  192. # variable ASFLAG_<flag> if it does (for invoking the assembler),
  193. # as well CFLAG_-Wa<flag> (for invoking the compiler driver).
  194. define check-as-var
  195. $(call check-tool-var,check_as,ASFLAG,$(1))
  196. _v = CFLAG_-Wa$(1)
  197. export $$(_v) = $$(if $$(ASFLAG_$(1)),-Wa$$(comma)$$(ASFLAG_$(1)))
  198. endef
  199. # Usage: check-ld-var,<flag>
  200. # Check the linker to see if it supports <flag>. Export the
  201. # variable LDFLAG_<flag> if it does (for invoking the linker),
  202. # as well CFLAG_-Wl<flag> (for invoking the compiler driver).
  203. define check-ld-var
  204. $(call check-tool-var,check_ld,LDFLAG,$(1))
  205. _v = CFLAG_-Wl$(1)
  206. export $$(_v) = $$(if $$(LDFLAG_$(1)),-Wl$$(comma)$$(LDFLAG_$(1)))
  207. endef
  208. # Usage: cache-output-var,<variable>,<shell command>
  209. # Execute <shell command> and cache the output in <variable>.
  210. define cache-output-var
  211. ifndef $(1)
  212. $(1) := $$(shell $(2))
  213. export $(1)
  214. endif
  215. endef
  216. ARFLAGS:=cr
  217. # Note: The check for -nostdlib has to be before all calls to check_ld
  218. $(eval $(call check-gcc-var,-nostdlib))
  219. $(eval $(call check-gcc-var,-nostartfiles))
  220. # deliberately not named CFLAG-fuse-ld since unchecked and from user
  221. LDFLAG-fuse-ld := $(filter -fuse-ld=%,$(call qstrip,$(UCLIBC_EXTRA_CFLAGS)))
  222. # failed to merge target specific data of file /dev/null
  223. # Could use -Wl,--script,$(top_srcdir)extra/scripts/none.lds as well.
  224. $(eval $(call check-ld-var,--no-warn-mismatch))
  225. $(eval $(call cache-output-var,GCC_VER,$(CC) -dumpversion))
  226. GCC_VER := $(subst ., ,$(GCC_VER))
  227. GCC_MAJOR_VER ?= $(word 1,$(GCC_VER))
  228. GCC_MINOR_VER ?= $(word 2,$(GCC_VER))
  229. # Flags in OPTIMIZATION are used only for non-debug builds
  230. OPTIMIZATION:=
  231. OPTIMIZATION-$(GCC_MAJOR_VER):=
  232. OPTIMIZATION-$(GCC_MAJOR_VER).$(GCC_MINOR_VER):=
  233. # Use '-Os' optimization if available, else use -O2, allow Config to override
  234. $(eval $(call check-gcc-var,-Os))
  235. ifneq ($(CFLAG_-Os),)
  236. OPTIMIZATION += $(CFLAG_-Os)
  237. else
  238. $(eval $(call check-gcc-var,-O2))
  239. OPTIMIZATION += $(CFLAG_-O2)
  240. endif
  241. # Use the gcc 3.4 -funit-at-a-time optimization when available
  242. $(eval $(call check-gcc-var,-funit-at-a-time))
  243. OPTIMIZATION-3.4 += $(CFLAG_-funit-at-a-time)
  244. $(eval $(call check-gcc-var,-fstrict-aliasing))
  245. OPTIMIZATION += $(CFLAG_-fstrict-aliasing)
  246. # CPU_CFLAGS-y contain options which are not warnings,
  247. # not include or library paths, and not optimizations.
  248. # Why -funsigned-char: I hunted a bug related to incorrect
  249. # sign extension of 'char' type for 10 hours straight. Not fun.
  250. CPU_CFLAGS-y := -funsigned-char -fno-builtin
  251. $(eval $(call check-gcc-var,-fno-asm))
  252. CPU_CFLAGS-y += $(CFLAG_-fno-asm)
  253. $(eval $(call check-gcc-var,-fmerge-all-constants))
  254. CPU_CFLAGS-y += $(CFLAG_-fmerge-all-constants)
  255. ifeq ($(UCLIBC_HAS_SOFT_FLOAT),y)
  256. ifneq ($(TARGET_ARCH),bfin)
  257. ifneq ($(TARGET_ARCH),lm32)
  258. ifneq ($(TARGET_ARCH),nios2)
  259. ifneq ($(TARGET_ARCH),nds32)
  260. ifneq ($(TARGET_ARCH),sh)
  261. ifneq ($(TARGET_ARCH),c6x)
  262. ifneq ($(TARGET_ARCH),h8300)
  263. ifneq ($(TARGET_ARCH),arc)
  264. ifneq ($(TARGET_ARCH),aarch64)
  265. CPU_CFLAGS-y += -msoft-float
  266. endif
  267. endif
  268. endif
  269. endif
  270. endif
  271. endif
  272. endif
  273. endif
  274. endif
  275. endif
  276. ifeq ($(TARGET_ARCH),aarch64)
  277. CPU_CFLAGS-y += -ftls-model=initial-exec
  278. endif
  279. $(eval $(call check-gcc-var,-std=gnu99))
  280. CPU_CFLAGS-y += $(CFLAG_-std=gnu99)
  281. CPU_CFLAGS-$(UCLIBC_FORMAT_SHARED_FLAT) += -mid-shared-library
  282. CPU_CFLAGS-$(UCLIBC_FORMAT_FLAT_SEP_DATA) += -msep-data
  283. CPU_LDFLAGS-$(ARCH_LITTLE_ENDIAN) += -Wl,-EL
  284. CPU_LDFLAGS-$(ARCH_BIG_ENDIAN) += -Wl,-EB
  285. PICFLAG-y := -fPIC
  286. PICFLAG-$(UCLIBC_FORMAT_FDPIC_ELF) := -mfdpic
  287. PICFLAG-$(UCLIBC_FORMAT_DSBT_ELF) := -mdsbt -fpic
  288. PICFLAG := $(PICFLAG-y)
  289. PIEFLAG_NAME:=-fPIE
  290. $(eval $(call check-gcc-var,-fdata-sections))
  291. $(eval $(call check-gcc-var,-ffunction-sections))
  292. # Some nice CPU specific optimizations
  293. ifeq ($(TARGET_ARCH),i386)
  294. $(eval $(call check-gcc-var,-fomit-frame-pointer))
  295. OPTIMIZATION += $(CFLAG_-fomit-frame-pointer)
  296. ifeq ($(CONFIG_386)$(CONFIG_486)$(CONFIG_586),y)
  297. # TODO: Change this to a gcc version check. This bug
  298. # should be fixed with at least gcc-4.3.
  299. # Non-SSE capable processor.
  300. # NB: this may make SSE insns segfault!
  301. # -O1 -march=pentium3, -Os -msse etc are known to be affected.
  302. # See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13685
  303. # -m32 is needed if host is 64-bit
  304. OPTIMIZATION+=$(call check_gcc,-m32 -mpreferred-stack-boundary=2,)
  305. else
  306. $(eval $(call check-gcc-var,-mpreferred-stack-boundary=4))
  307. OPTIMIZATION += $(CFLAG_-mpreferred-stack-boundary=4)
  308. endif
  309. # Choice of alignment (please document why!)
  310. # -falign-labels: in-line labels
  311. # (reachable by normal code flow, aligning will insert nops
  312. # which will be executed - may even make things slower)
  313. # -falign-jumps: reachable only by a jump
  314. # Generic: no alignment at all (smallest code)
  315. GCC_FALIGN=$(call check_gcc,-falign-functions=1 -falign-jumps=1 -falign-labels=1 -falign-loops=1,-malign-jumps=1 -malign-loops=1)
  316. OPTIMIZATION+=$(GCC_FALIGN)
  317. # Putting each function and data object into its own section
  318. # allows for kbytes of less text if users link against static uclibc
  319. # using ld --gc-sections.
  320. # ld 2.18 can't do that (yet?) for shared libraries, so we itself
  321. # do not use --gc-sections at shared lib link time.
  322. # However, in combination with sections being sorted by alignment
  323. # it does result in much reduced padding:
  324. # text data bss dec hex
  325. # 235319 1472 5992 242783 3b45f old.so
  326. # 234104 1472 5980 241556 3af94 new.so
  327. # Without -ffunction-sections, all functions will get aligned
  328. # to 4 byte boundary by as/ld. This is arguably a bug in as.
  329. # It specifies 4 byte align for .text even if not told to do so:
  330. # Idx Name Size VMA LMA File off Algn
  331. # 0 .text xxxxxxxx 00000000 00000000 xxxxxxxx 2**2 <===!
  332. CPU_CFLAGS-y += $(CFLAG_-ffunction-sections) $(CFLAG_-fdata-sections)
  333. CPU_LDFLAGS-y += $(CFLAG_-Wl--sort-common)
  334. $(eval $(call check-ld-var,--sort-section=alignment))
  335. CPU_LDFLAGS-y += $(CFLAG_-Wl--sort-section=alignment)
  336. CPU_LDFLAGS-y+=-m32
  337. CPU_CFLAGS-y+=-m32
  338. endif
  339. ifeq ($(TARGET_ARCH),sparc)
  340. CPU_CFLAGS-$(CONFIG_SPARC_V7)+=-mcpu=v7
  341. CPU_CFLAGS-$(CONFIG_SPARC_V8)+=-mcpu=v8
  342. CPU_CFLAGS-$(CONFIG_SPARC_V9)+=-mcpu=v9
  343. CPU_CFLAGS-$(CONFIG_SPARC_V9B)+=$(call check_gcc,-mcpu=v9b,-mcpu=ultrasparc)
  344. endif
  345. ifeq ($(TARGET_ARCH),arm)
  346. CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-mlittle-endian
  347. CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mbig-endian
  348. endif
  349. ifeq ($(TARGET_ARCH),metag)
  350. SYMBOL_PREFIX=_
  351. CPU_CFLAGS-$(CONFIG_META_1_2)+=
  352. CPU_CFLAGS-$(CONFIG_META_2_1)+=-Wa,-mcpu=metac21
  353. endif
  354. ifeq ($(TARGET_ARCH),mips)
  355. OPTIMIZATION+=-mno-split-addresses
  356. CPU_CFLAGS-$(CONFIG_MIPS_N64_ABI)+=-mabi=64
  357. CPU_CFLAGS-$(CONFIG_MIPS_O32_ABI)+=-mabi=32
  358. CPU_CFLAGS-$(CONFIG_MIPS_N32_ABI)+=-mabi=n32
  359. CPU_CFLAGS-$(CONFIG_MIPS_NAN_LEGACY)+=$(call check_gcc,-mnan=legacy)
  360. CPU_CFLAGS-$(CONFIG_MIPS_NAN_2008)+=$(call check_gcc,-mnan=2008)
  361. CPU_LDFLAGS-y += $(CPU_CFLAGS)
  362. endif
  363. ifeq ($(TARGET_ARCH),nds32)
  364. CPU_CFLAGS-$(CONFIG_NDS32_ISA)+=-march=nds32
  365. CFLAGS-.os+= -DPIC
  366. CFLAGS-.oS+= -DPIC
  367. endif
  368. ifeq ($(TARGET_ARCH),sh)
  369. $(eval $(call check-gcc-var,-mprefergot))
  370. OPTIMIZATION += $(CFLAG_-mprefergot)
  371. CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-ml
  372. CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mb
  373. CPU_CFLAGS-$(CONFIG_SH2)+=-m2
  374. CPU_CFLAGS-$(CONFIG_SH3)+=-m3
  375. ifeq ($(UCLIBC_HAS_FPU),y)
  376. CPU_CFLAGS-$(CONFIG_SH2A)+=-m2a
  377. CPU_CFLAGS-$(CONFIG_SH4)+=-m4
  378. CPU_CFLAGS-$(CONFIG_SH4A)+=-m4a
  379. else
  380. CPU_CFLAGS-$(CONFIG_SH2A)+=-m2a-nofpu
  381. CPU_CFLAGS-$(CONFIG_SH4)+=-m4-nofpu
  382. CPU_CFLAGS-$(CONFIG_SH4A)+=-m4a-nofpu
  383. endif
  384. endif
  385. ifeq ($(TARGET_ARCH),h8300)
  386. CPU_CFLAGS-$(CONFIG_H8300H) += -mh -mint32
  387. CPU_CFLAGS-$(CONFIG_H8S) += -ms -mint32
  388. endif
  389. ifeq ($(TARGET_ARCH),cris)
  390. CPU_LDFLAGS-$(CONFIG_CRIS)+=-Wl,-mcrislinux
  391. CPU_LDFLAGS-$(CONFIG_CRISV32)+=-Wl,-mcrislinux
  392. CPU_CFLAGS-$(CONFIG_CRIS)+=-mlinux
  393. PICFLAG:=-fpic
  394. PIEFLAG_NAME:=-fpie
  395. endif
  396. ifeq ($(TARGET_ARCH),csky)
  397. # In csky gas implement, we use $t and $d to detect .text or literal pool.
  398. # So we couldn't strip them for objdump.
  399. STRIP_FLAGS += -K "$$"t -K "$$"d
  400. CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN) += -mlittle-endian
  401. CPU_CFLAGS-$(ARCH_BIG_ENDIAN) += -mbig-endian
  402. endif
  403. ifeq ($(TARGET_ARCH),m68k)
  404. # -fPIC is only supported for 68020 and above. It is not supported
  405. # for 68000, 68010, or Coldfire.
  406. PICFLAG:=-fpic
  407. PIEFLAG_NAME:=-fpie
  408. endif
  409. ifeq ($(TARGET_ARCH),powerpc)
  410. # PowerPC can hold 8192 entries in its GOT with -fpic which is more than
  411. # enough. Therefore use -fpic which will reduce code size and generates
  412. # faster code.
  413. PICFLAG:=-fpic
  414. PIEFLAG_NAME:=-fpie
  415. PPC_HAS_REL16:=$(shell printf "\t.text\n\taddis 11,30,_GLOBAL_OFFSET_TABLE_-.@ha\n" | $(CC) -c -x assembler -o /dev/null - 2> /dev/null && echo -n y || echo -n n)
  416. CPU_CFLAGS-$(PPC_HAS_REL16)+= -DHAVE_ASM_PPC_REL16
  417. CPU_CFLAGS-$(CONFIG_E500) += "-D__NO_MATH_INLINES"
  418. endif
  419. ifeq ($(TARGET_ARCH),bfin)
  420. SYMBOL_PREFIX=_
  421. ifeq ($(UCLIBC_FORMAT_FDPIC_ELF),y)
  422. CPU_CFLAGS-y:=-mfdpic
  423. CPU_LDFLAGS-y += -Wl,-melf32bfinfd
  424. PICFLAG:=-fpic
  425. PIEFLAG_NAME:=-fpie
  426. endif
  427. ifeq ($(UCLIBC_FORMAT_SHARED_FLAT),y)
  428. PICFLAG := -mleaf-id-shared-library
  429. endif
  430. endif
  431. ifeq ($(TARGET_ARCH),frv)
  432. # Using -pie causes the program to have an interpreter, which is
  433. # forbidden, so we must make do with -shared. Unfortunately,
  434. # -shared by itself would get us global function descriptors
  435. # and calls through PLTs, dynamic resolution of symbols, etc,
  436. # which would break as well, but -Bsymbolic comes to the rescue.
  437. CPU_LDFLAGS-y += -Wl,-melf32frvfd -Wl,-Bsymbolic
  438. endif
  439. ifeq ($(strip $(TARGET_ARCH)),avr32)
  440. CPU_CFLAGS-$(CONFIG_AVR32_AP7) += -march=ap
  441. CPU_CFLAGS-$(CONFIG_LINKRELAX) += -mrelax
  442. CPU_LDFLAGS-$(CONFIG_LINKRELAX) += --relax
  443. endif
  444. ifeq ($(TARGET_ARCH),c6x)
  445. PIEFLAG:=
  446. CPU_CFLAGS-$(CONFIG_TMS320C64X) += -march=c64x
  447. CPU_CFLAGS-$(CONFIG_TMS320C64XPLUS) += -march=c64x+
  448. CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-mlittle-endian
  449. CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mbig-endian
  450. CPU_LDFLAGS-y += $(CPU_CFLAGS)
  451. endif
  452. $(eval $(call check-gcc-var,$(PIEFLAG_NAME)))
  453. PIEFLAG := $(CFLAG_$(PIEFLAG_NAME))
  454. ifeq ($(PIEFLAG),)
  455. PIEFLAG := $(PICFLAG)
  456. endif
  457. # We need to keep track of both the CC PIE flag (above) as
  458. # well as the LD PIE flag (below) because we can't rely on
  459. # gcc passing -pie if we used -fPIE. We need to directly use -pie
  460. # instead of -Wl,-pie as gcc picks up the wrong startfile/endfile
  461. $(eval $(call cache-output-var,LDPIEFLAG,$(CC) -Wl$(comma)--help 2>/dev/null | grep -q -- -pie && echo "-pie"))
  462. # Check for --as-needed support in linker
  463. ifndef LD_FLAG_ASNEEDED
  464. _LD_FLAG_ASNEEDED:=$(shell $(CC) -Wl,--help 2>/dev/null | grep -- --as-needed)
  465. ifneq ($(_LD_FLAG_ASNEEDED),)
  466. export LD_FLAG_ASNEEDED:=--as-needed
  467. endif
  468. endif
  469. ifndef LD_FLAG_NO_ASNEEDED
  470. ifdef LD_FLAG_ASNEEDED
  471. export LD_FLAG_NO_ASNEEDED:=--no-as-needed
  472. endif
  473. endif
  474. ifndef CC_FLAG_ASNEEDED
  475. ifdef LD_FLAG_ASNEEDED
  476. export CC_FLAG_ASNEEDED:=-Wl,$(LD_FLAG_ASNEEDED)
  477. endif
  478. endif
  479. ifndef CC_FLAG_NO_ASNEEDED
  480. ifdef LD_FLAG_NO_ASNEEDED
  481. export CC_FLAG_NO_ASNEEDED:=-Wl,$(LD_FLAG_NO_ASNEEDED)
  482. endif
  483. endif
  484. link.asneeded = $(if $(CC_FLAG_ASNEEDED),$(if $(CC_FLAG_NO_ASNEEDED),$(CC_FLAG_ASNEEDED) $(1) $(CC_FLAG_NO_ASNEEDED)))
  485. # Check for AS_NEEDED support in linker script (binutils>=2.16.1 has it)
  486. ifndef ASNEEDED
  487. export ASNEEDED:=$(shell $(CC) -Wl,--help 2>/dev/null | grep -q -- --as-needed && echo "AS_NEEDED ( $(UCLIBC_LDSO) )" || echo "$(UCLIBC_LDSO)")
  488. endif
  489. # Add a bunch of extra pedantic annoyingly strict checks
  490. WARNING_FLAGS = -Wstrict-prototypes -Wstrict-aliasing -Wno-nonnull-compare
  491. ifeq ($(EXTRA_WARNINGS),y)
  492. WARNING_FLAGS += \
  493. -Wnonnull-compare \
  494. -Wnodeclaration-after-statement \
  495. -Wformat=2 \
  496. -Wmissing-noreturn \
  497. -Wmissing-format-attribute \
  498. -Wmissing-prototypes \
  499. -Wmissing-declarations \
  500. -Wnested-externs \
  501. -Wnonnull \
  502. -Wold-style-declaration \
  503. -Wold-style-definition \
  504. -Wshadow \
  505. -Wundef
  506. endif
  507. WARNING_FLAGS += $(WARNING_FLAGS-gcc-$(GCC_MAJOR_VER))
  508. $(foreach w,$(WARNING_FLAGS),$(eval $(call check-gcc-var,$(w))))
  509. XWARNINGS = $(call qstrip,$(WARNINGS)) $(foreach w,$(WARNING_FLAGS),$(CFLAG_$(w)))
  510. CPU_CFLAGS=$(call qstrip,$(CPU_CFLAGS-y))
  511. # Save the tested flag in a single variable and force it to be
  512. # evaluated just once. Then use that computed value.
  513. $(eval $(call check-gcc-var,-fno-stack-protector))
  514. SSP_DISABLE_FLAGS ?= $(CFLAG_-fno-stack-protector)
  515. ifeq ($(UCLIBC_BUILD_SSP),y)
  516. $(eval $(call check-gcc-var,-fno-stack-protector-all))
  517. $(eval $(call check-gcc-var,-fstack-protector))
  518. $(eval $(call check-gcc-var,-fstack-protector-all))
  519. SSP_CFLAGS := $(CFLAG_-fno-stack-protector-all)
  520. SSP_CFLAGS += $(CFLAG_-fstack-protector)
  521. SSP_ALL_CFLAGS ?= $(CFLAG_-fstack-protector-all)
  522. else
  523. SSP_CFLAGS := $(SSP_DISABLE_FLAGS)
  524. endif
  525. # Collect all CFLAGS components
  526. CFLAGS := $(XWARNINGS) $(CPU_CFLAGS) $(SSP_CFLAGS) \
  527. -nostdinc -I$(top_builddir)include \
  528. -I$(top_srcdir)include -include libc-symbols.h \
  529. -I$(top_srcdir)libc/sysdeps/linux/$(TARGET_ARCH) \
  530. -I$(top_srcdir)libc/sysdeps/linux \
  531. -I$(top_srcdir)ldso/ldso/$(TARGET_ARCH) \
  532. -I$(top_srcdir)ldso/include -I.
  533. # We need this to be checked within libc-symbols.h
  534. ifneq ($(HAVE_SHARED),y)
  535. CFLAGS += -DSTATIC
  536. endif
  537. $(eval $(call check-ld-var,--warn-once))
  538. $(eval $(call check-ld-var,--sort-common))
  539. $(eval $(call check-ld-var,--discard-all))
  540. LDFLAGS_NOSTRIP:=$(LDFLAG-fuse-ld) $(CPU_LDFLAGS-y) -shared \
  541. -Wl,--warn-common $(CFLAG_-Wl--warn-once) -Wl,-z,combreloc
  542. ifeq ($(UCLIBC_BUILD_RELRO),y)
  543. LDFLAGS_NOSTRIP+=-Wl,-z,relro
  544. endif
  545. ifeq ($(UCLIBC_BUILD_NOW),y)
  546. LDFLAGS_NOSTRIP+=-Wl,-z,now
  547. endif
  548. ifeq ($(LDSO_GNU_HASH_SUPPORT),y)
  549. # Be sure that binutils support it
  550. $(eval $(call check-ld-var,--hash-style=gnu))
  551. ifeq ($(LDFLAG_--hash-style=gnu),)
  552. ifneq ($(filter-out $(clean_targets) CLEAN_% install_headers headers-y,$(MAKECMDGOALS)),)
  553. $(error Your binutils do not support --hash-style option, while you want to use it)
  554. endif
  555. else
  556. LDFLAGS_NOSTRIP += $(CFLAG_-Wl--hash-style=gnu)
  557. endif
  558. endif
  559. ifeq ($(DODEBUG),y)
  560. CFLAGS += -O0 -g3 -DDEBUG
  561. else
  562. CFLAGS += $(OPTIMIZATION)
  563. CFLAGS += $(OPTIMIZATION-$(GCC_MAJOR_VER))
  564. CFLAGS += $(OPTIMIZATION-$(GCC_MAJOR_VER).$(GCC_MINOR_VER))
  565. $(eval $(call check-ld-var,-O2))
  566. LDFLAGS_NOSTRIP += $(CFLAG_-Wl-O2)
  567. endif
  568. LDFLAGS:=$(LDFLAGS_NOSTRIP) -Wl,-z,defs
  569. ifeq ($(DOSTRIP),y)
  570. LDFLAGS += -Wl,-s
  571. else
  572. STRIPTOOL := true -Stripping_disabled
  573. endif
  574. ifneq ($(strip $(UCLIBC_EXTRA_CFLAGS)),"")
  575. CFLAGS += $(call qstrip,$(UCLIBC_EXTRA_CFLAGS))
  576. endif
  577. ifneq ($(strip $(UCLIBC_EXTRA_LDFLAGS)),"")
  578. LDFLAGS += $(call qstrip,$(UCLIBC_EXTRA_LDFLAGS))
  579. endif
  580. ifeq ($(UCLIBC_HAS_STDIO_FUTEXES),y)
  581. CFLAGS += -D__USE_STDIO_FUTEXES__
  582. endif
  583. ifeq ($(UCLIBC_HAS_THREADS),y)
  584. ifeq ($(UCLIBC_HAS_THREADS_NATIVE),y)
  585. PTNAME := nptl
  586. CFLAGS += -DHAVE_FORCED_UNWIND -D_LIBC_REENTRANT
  587. else
  588. ifeq ($(UCLIBC_HAS_LINUXTHREADS),y)
  589. PTNAME := linuxthreads
  590. endif
  591. endif
  592. PTDIR := libpthread/$(PTNAME)
  593. # set up system dependencies include dirs (NOTE: order matters!)
  594. ifeq ($(UCLIBC_HAS_THREADS_NATIVE),y)
  595. PTINC:= -I$(top_builddir)$(PTDIR) \
  596. -I$(top_srcdir)$(PTDIR) \
  597. $(if $(TARGET_SUBARCH),-I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH)/$(TARGET_SUBARCH)) \
  598. -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH) \
  599. -I$(top_builddir)$(PTDIR)/sysdeps/$(TARGET_ARCH) \
  600. -I$(top_srcdir)$(PTDIR)/sysdeps/$(TARGET_ARCH) \
  601. -I$(top_builddir)$(PTDIR)/sysdeps/unix/sysv/linux \
  602. -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux \
  603. -I$(top_srcdir)$(PTDIR)/sysdeps/pthread \
  604. -I$(top_srcdir)$(PTDIR)/sysdeps/pthread/bits \
  605. -I$(top_srcdir)$(PTDIR)/sysdeps/generic
  606. #
  607. # Test for TLS if NPTL support was selected.
  608. #
  609. GCC_HAS_TLS=$(shell \
  610. echo "extern __thread int foo;" | $(CC) -o /dev/null -S -xc - 2>&1)
  611. ifneq ($(GCC_HAS_TLS),)
  612. gcc_tls_test_fail:
  613. @echo "####";
  614. @echo "#### Your compiler does not support TLS and you are trying to build uClibc-ng";
  615. @echo "#### with NPTL support. Upgrade your binutils and gcc to versions which";
  616. @echo "#### support TLS for your architecture. Do not contact uClibc-ng maintainers";
  617. @echo "#### about this problem.";
  618. @echo "####";
  619. @echo "#### Exiting...";
  620. @echo "####";
  621. @exit 1;
  622. endif
  623. else
  624. PTINC := \
  625. -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH) \
  626. -I$(top_srcdir)$(PTDIR)/sysdeps/$(TARGET_ARCH) \
  627. -I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux \
  628. -I$(top_srcdir)$(PTDIR)/sysdeps/pthread \
  629. -I$(top_srcdir)$(PTDIR) \
  630. -I$(top_srcdir)libpthread
  631. endif
  632. CFLAGS+=$(PTINC)
  633. else
  634. PTNAME :=
  635. PTINC :=
  636. endif
  637. CFLAGS += -I$(top_srcdir)libc/sysdeps/linux/common
  638. #CFLAGS += -iwithprefix include-fixed -iwithprefix include
  639. $(eval $(call cache-output-var,CC_IPREFIX,$(CC) -print-file-name=include))
  640. CC_INC := -isystem $(dir $(CC_IPREFIX))include-fixed -isystem $(CC_IPREFIX)
  641. CFLAGS += $(CC_INC)
  642. CFLAGS += -I$(KERNEL_HEADERS)
  643. ifneq ($(DOASSERTS),y)
  644. CFLAGS+=-DNDEBUG
  645. endif
  646. ifeq ($(SYMBOL_PREFIX),_)
  647. CFLAGS+=-D__UCLIBC_UNDERSCORES__
  648. endif
  649. # Keep the check_as from being needlessly executed
  650. ifeq ($(UCLIBC_BUILD_NOEXECSTACK),y)
  651. $(eval $(call check-as-var,--noexecstack))
  652. endif
  653. ASFLAGS += $(ASFLAG_--noexecstack)
  654. LIBGCC_CFLAGS ?= $(CFLAGS) $(CPU_CFLAGS-y)
  655. $(eval $(call cache-output-var,LIBGCC_A,$(CC) $(LIBGCC_CFLAGS) -print-libgcc-file-name))
  656. $(eval $(call cache-output-var,LIBGCC_EH,$(CC) $(LIBGCC_CFLAGS) -print-file-name=libgcc_eh.a))
  657. # with -O0 we (e.g. lockf) might end up with references to
  658. # _Unwind_Resume, so pull in gcc_eh in this case..
  659. # with a --disable-shared toolchain, libgcc_eh.a and libgcc.a are combined
  660. # in libgcc.a, so check if the printed file exist, before adding to the commandline
  661. LIBGCC_EH_FILE := $(shell if [ -f $(LIBGCC_EH) ]; then echo $(LIBGCC_EH); fi)
  662. LIBGCC_DIR := $(dir $(LIBGCC_A))
  663. LIBGCC := $(LIBGCC_A) $(if $(DODEBUG),$(LIBGCC_EH_FILE))
  664. # moved from libpthread/linuxthreads
  665. ifeq ($(UCLIBC_CTOR_DTOR),y)
  666. SHARED_START_FILES:=$(top_builddir)lib/crti.o $(LIBGCC_DIR)crtbeginS.o
  667. SHARED_END_FILES:=$(LIBGCC_DIR)crtendS.o $(top_builddir)lib/crtn.o
  668. endif
  669. LOCAL_INSTALL_PATH := $(if $(O),$(O)/)install_dir
  670. PTHREAD_GENERATE_MANGLE ?= -n "s/^.*@@@name@@@\([^@]*\)@@@value@@@[^0-9Xxa-fA-F-]*\([0-9Xxa-fA-F-][0-9Xxa-fA-F-]*\).*@@@end@@@.*\$$/\#define \1 \2/p"