Rules.mak 17 KB

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  1. # Rules.make for uClibc
  2. #
  3. # Copyright (C) 2000-2006 Erik Andersen <andersen@uclibc.org>
  4. #
  5. # Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
  6. #
  7. # check for proper make version
  8. ifneq ($(findstring 3.7,$(MAKE_VERSION)),)
  9. $(error Your make is too old $(MAKE_VERSION). Go get at least 3.80)
  10. endif
  11. #-----------------------------------------------------------
  12. # This file contains rules which are shared between multiple
  13. # Makefiles. All normal configuration options live in the
  14. # file named ".config". Don't mess with this file unless
  15. # you know what you are doing.
  16. #-----------------------------------------------------------
  17. # If you are running a cross compiler, you will want to set
  18. # 'CROSS' to something more interesting ... Target
  19. # architecture is determined by asking the CC compiler what
  20. # arch it compiles things for, so unless your compiler is
  21. # broken, you should not need to specify TARGET_ARCH.
  22. #
  23. # Most people will set this stuff on the command line, i.e.
  24. # make CROSS=arm-linux-
  25. # will build uClibc for 'arm'.
  26. ifndef CROSS
  27. CROSS=
  28. endif
  29. CC = $(CROSS)gcc
  30. AR = $(CROSS)ar
  31. LD = $(CROSS)ld
  32. NM = $(CROSS)nm
  33. STRIPTOOL = $(CROSS)strip
  34. INSTALL = install
  35. LN = ln
  36. RM = rm -f
  37. TAR = tar
  38. STRIP_FLAGS ?= -x -R .note -R .comment
  39. # Select the compiler needed to build binaries for your development system
  40. HOSTCC = gcc
  41. BUILD_CFLAGS = -O2 -Wall
  42. #---------------------------------------------------------
  43. # Nothing beyond this point should ever be touched by mere
  44. # mortals. Unless you hang out with the gods, you should
  45. # probably leave all this stuff alone.
  46. # Pull in the user's uClibc configuration
  47. ifeq ($(filter $(noconfig_targets),$(MAKECMDGOALS)),)
  48. -include $(top_builddir).config
  49. endif
  50. # Make certain these contain a final "/", but no "//"s.
  51. TARGET_ARCH:=$(shell grep -s '^TARGET_ARCH' $(top_builddir)/.config | sed -e 's/^TARGET_ARCH=//' -e 's/"//g')
  52. TARGET_ARCH:=$(strip $(subst ",, $(strip $(TARGET_ARCH))))
  53. RUNTIME_PREFIX:=$(strip $(subst //,/, $(subst ,/, $(subst ",, $(strip $(RUNTIME_PREFIX))))))
  54. DEVEL_PREFIX:=$(strip $(subst //,/, $(subst ,/, $(subst ",, $(strip $(DEVEL_PREFIX))))))
  55. KERNEL_HEADERS:=$(strip $(subst //,/, $(subst ,/, $(subst ",, $(strip $(KERNEL_HEADERS))))))
  56. export RUNTIME_PREFIX DEVEL_PREFIX KERNEL_HEADERS
  57. # Now config hard core
  58. MAJOR_VERSION := 0
  59. MINOR_VERSION := 9
  60. SUBLEVEL := 29
  61. VERSION := $(MAJOR_VERSION).$(MINOR_VERSION).$(SUBLEVEL)
  62. # Ensure consistent sort order, 'gcc -print-search-dirs' behavior, etc.
  63. LC_ALL := C
  64. export MAJOR_VERSION MINOR_VERSION SUBLEVEL VERSION LC_ALL
  65. LIBC := libc
  66. SHARED_MAJORNAME := $(LIBC).so.$(MAJOR_VERSION)
  67. ifneq ($(findstring $(TARGET_ARCH) , hppa64 ia64 mips64 powerpc64 s390x sh64 sparc64 x86_64 ),)
  68. UCLIBC_LDSO_NAME := ld64-uClibc
  69. else
  70. UCLIBC_LDSO_NAME := ld-uClibc
  71. endif
  72. UCLIBC_LDSO := $(UCLIBC_LDSO_NAME).so.$(MAJOR_VERSION)
  73. NONSHARED_LIBNAME := uclibc_nonshared.a
  74. libc := $(top_builddir)lib/$(SHARED_MAJORNAME)
  75. interp := $(top_builddir)lib/interp.os
  76. ldso := $(top_builddir)lib/$(UCLIBC_LDSO)
  77. headers_dep := $(top_builddir)include/bits/sysnum.h
  78. sub_headers := $(headers_dep)
  79. #LIBS :=$(interp) -L$(top_builddir)lib -lc
  80. LIBS := $(interp) -L$(top_builddir)lib $(libc:.$(MAJOR_VERSION)=)
  81. # Make sure DESTDIR and PREFIX can be used to install
  82. # PREFIX is a uClibcism while DESTDIR is a common GNUism
  83. ifndef PREFIX
  84. PREFIX = $(DESTDIR)
  85. endif
  86. ifneq ($(HAVE_SHARED),y)
  87. libc :=
  88. interp :=
  89. ldso :=
  90. endif
  91. ifndef CROSS
  92. CROSS=$(subst ",, $(strip $(CROSS_COMPILER_PREFIX)))
  93. endif
  94. # A nifty macro to make testing gcc features easier
  95. check_gcc=$(shell \
  96. if $(CC) $(1) -S -o /dev/null -xc /dev/null > /dev/null 2>&1; \
  97. then echo "$(1)"; else echo "$(2)"; fi)
  98. check_as=$(shell \
  99. if $(CC) -Wa,$(1) -Wa,-Z -c -o /dev/null -xassembler /dev/null > /dev/null 2>&1; \
  100. then echo "-Wa,$(1)"; fi)
  101. check_ld=$(shell \
  102. if $(LD) $(1) -o /dev/null -b binary /dev/null > /dev/null 2>&1; \
  103. then echo "$(1)"; fi)
  104. ARFLAGS:=cr
  105. OPTIMIZATION:=
  106. # Use '-Os' optimization if available, else use -O2, allow Config to override
  107. OPTIMIZATION+=$(call check_gcc,-Os,-O2)
  108. # Use the gcc 3.4 -funit-at-a-time optimization when available
  109. OPTIMIZATION+=$(call check_gcc,-funit-at-a-time,)
  110. GCC_MAJOR_VER?=$(shell $(CC) -dumpversion | cut -d . -f 1)
  111. #GCC_MINOR_VER?=$(shell $(CC) -dumpversion | cut -d . -f 2)
  112. ifeq ($(GCC_MAJOR_VER),4)
  113. # shrinks code, results are from 4.0.2
  114. # 0.36%
  115. OPTIMIZATION+=$(call check_gcc,-fno-tree-loop-optimize,)
  116. # 0.34%
  117. OPTIMIZATION+=$(call check_gcc,-fno-tree-dominator-opts,)
  118. # 0.1%
  119. OPTIMIZATION+=$(call check_gcc,-fno-strength-reduce,)
  120. endif
  121. ifeq ($(UCLIBC_FORMAT_FDPIC_ELF),y)
  122. PICFLAG:=-mfdpic
  123. else
  124. PICFLAG:=-fPIC
  125. endif
  126. PIEFLAG_NAME:=-fPIE
  127. # Some nice CPU specific optimizations
  128. ifeq ($(TARGET_ARCH),i386)
  129. OPTIMIZATION+=$(call check_gcc,-mpreferred-stack-boundary=2,)
  130. OPTIMIZATION+=$(call check_gcc,-falign-jumps=0 -falign-loops=0,-malign-jumps=0 -malign-loops=0)
  131. CPU_CFLAGS-$(CONFIG_386)+=-march=i386
  132. CPU_CFLAGS-$(CONFIG_486)+=-march=i486
  133. CPU_CFLAGS-$(CONFIG_ELAN)+=-march=i486
  134. CPU_CFLAGS-$(CONFIG_586)+=-march=i586
  135. CPU_CFLAGS-$(CONFIG_586MMX)+=$(call check_gcc,-march=pentium-mmx,-march=i586)
  136. CPU_CFLAGS-$(CONFIG_686)+=-march=i686
  137. CPU_CFLAGS-$(CONFIG_PENTIUMII)+=$(call check_gcc,-march=pentium2,-march=i686)
  138. CPU_CFLAGS-$(CONFIG_PENTIUMIII)+=$(call check_gcc,-march=pentium3,-march=i686)
  139. CPU_CFLAGS-$(CONFIG_PENTIUM4)+=$(call check_gcc,-march=pentium4,-march=i686)
  140. CPU_CFLAGS-$(CONFIG_K6)+=$(call check_gcc,-march=k6,-march=i586)
  141. CPU_CFLAGS-$(CONFIG_K7)+=$(call check_gcc,-march=athlon,-march=i686) $(call check_gcc,-falign-functions=4,-malign-functions=4)
  142. CPU_CFLAGS-$(CONFIG_CRUSOE)+=-march=i686 $(call check_gcc,-falign-functions=0,-malign-functions=0)
  143. CPU_CFLAGS-$(CONFIG_WINCHIPC6)+=$(call check_gcc,-march=winchip-c6,-march=i586)
  144. CPU_CFLAGS-$(CONFIG_WINCHIP2)+=$(call check_gcc,-march=winchip2,-march=i586)
  145. CPU_CFLAGS-$(CONFIG_CYRIXIII)+=$(call check_gcc,-march=c3,-march=i486) $(call check_gcc,-falign-functions=0,-malign-functions=0)
  146. CPU_CFLAGS-$(CONFIG_NEHEMIAH)+=$(call check_gcc,-march=c3-2,-march=i686)
  147. endif
  148. ifeq ($(TARGET_ARCH),sparc)
  149. CPU_CFLAGS-$(CONFIG_SPARC_V7)+=-mcpu=v7
  150. CPU_CFLAGS-$(CONFIG_SPARC_V8)+=-mcpu=v8
  151. CPU_CFLAGS-$(CONFIG_SPARC_V9)+=-mcpu=v9
  152. CPU_CFLAGS-$(CONFIG_SPARC_V9B)+=$(call check_gcc,-mcpu=v9b,-mcpu=ultrasparc)
  153. endif
  154. ifeq ($(TARGET_ARCH),arm)
  155. OPTIMIZATION+=-fstrict-aliasing
  156. CPU_LDFLAGS-$(ARCH_LITTLE_ENDIAN)+=-EL
  157. CPU_LDFLAGS-$(ARCH_BIG_ENDIAN)+=-EB
  158. CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-mlittle-endian
  159. CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mbig-endian
  160. CPU_CFLAGS-$(CONFIG_GENERIC_ARM)+=
  161. CPU_CFLAGS-$(CONFIG_ARM610)+=-mtune=arm610 -march=armv3
  162. CPU_CFLAGS-$(CONFIG_ARM710)+=-mtune=arm710 -march=armv3
  163. CPU_CFLAGS-$(CONFIG_ARM7TDMI)+=-mtune=arm7tdmi -march=armv4t
  164. CPU_CFLAGS-$(CONFIG_ARM720T)+=-mtune=arm7tdmi -march=armv4t
  165. CPU_CFLAGS-$(CONFIG_ARM920T)+=-mtune=arm9tdmi -march=armv4t
  166. CPU_CFLAGS-$(CONFIG_ARM922T)+=-mtune=arm9tdmi -march=armv4t
  167. CPU_CFLAGS-$(CONFIG_ARM926T)+=-mtune=arm9tdmi -march=armv5t
  168. CPU_CFLAGS-$(CONFIG_ARM10T)+=-mtune=arm10tdmi -march=armv5t
  169. CPU_CFLAGS-$(CONFIG_ARM1136JF_S)+=-mtune=arm1136jf-s -march=armv6
  170. CPU_CFLAGS-$(CONFIG_ARM_SA110)+=-mtune=strongarm110 -march=armv4
  171. CPU_CFLAGS-$(CONFIG_ARM_SA1100)+=-mtune=strongarm1100 -march=armv4
  172. CPU_CFLAGS-$(CONFIG_ARM_XSCALE)+=$(call check_gcc,-mtune=xscale,-mtune=strongarm110)
  173. CPU_CFLAGS-$(CONFIG_ARM_XSCALE)+=-march=armv5te -Wa,-mcpu=xscale
  174. CPU_CFLAGS-$(CONFIG_ARM_IWMMXT)+=-march=iwmmxt -Wa,-mcpu=iwmmxt -mabi=iwmmxt
  175. endif
  176. ifeq ($(TARGET_ARCH),mips)
  177. CPU_LDFLAGS-$(ARCH_LITTLE_ENDIAN)+=-EL
  178. CPU_LDFLAGS-$(ARCH_BIG_ENDIAN)+=-EB
  179. CPU_CFLAGS-$(CONFIG_MIPS_ISA_1)+=-mips1
  180. CPU_CFLAGS-$(CONFIG_MIPS_ISA_2)+=-mips2 -mtune=mips2
  181. CPU_CFLAGS-$(CONFIG_MIPS_ISA_3)+=-mips3 -mtune=mips3
  182. CPU_CFLAGS-$(CONFIG_MIPS_ISA_4)+=-mips4 -mtune=mips4
  183. CPU_CFLAGS-$(CONFIG_MIPS_ISA_MIPS32)+=-mips32 -mtune=mips32
  184. CPU_CFLAGS-$(CONFIG_MIPS_ISA_MIPS64)+=-mips64 -mtune=mips32
  185. ifeq ($(strip $(ARCH_BIG_ENDIAN)),y)
  186. CPU_LDFLAGS-$(CONFIG_MIPS_N64_ABI)+=-melf64btsmip
  187. CPU_LDFLAGS-$(CONFIG_MIPS_O32_ABI)+=-melf32btsmip
  188. endif
  189. ifeq ($(strip $(ARCH_LITTLE_ENDIAN)),y)
  190. CPU_LDFLAGS-$(CONFIG_MIPS_N64_ABI)+=-melf64ltsmip
  191. CPU_LDFLAGS-$(CONFIG_MIPS_O32_ABI)+=-melf32ltsmip
  192. endif
  193. CPU_CFLAGS-$(CONFIG_MIPS_N64_ABI)+=-mabi=64
  194. CPU_CFLAGS-$(CONFIG_MIPS_O32_ABI)+=-mabi=32
  195. CPU_CFLAGS-$(CONFIG_MIPS_N32_ABI)+=-mabi=n32
  196. endif
  197. ifeq ($(TARGET_ARCH),nios)
  198. CPU_LDFLAGS-y+=-m32
  199. CPU_CFLAGS-y+=-m32
  200. endif
  201. ifeq ($(TARGET_ARCH),sh)
  202. OPTIMIZATION+=-fstrict-aliasing
  203. OPTIMIZATION+= $(call check_gcc,-mprefergot,)
  204. CPU_LDFLAGS-$(ARCH_LITTLE_ENDIAN)+=-EL
  205. CPU_LDFLAGS-$(ARCH_BIG_ENDIAN)+=-EB
  206. CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-ml
  207. CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mb
  208. CPU_CFLAGS-$(CONFIG_SH2)+=-m2
  209. CPU_CFLAGS-$(CONFIG_SH3)+=-m3
  210. ifeq ($(UCLIBC_HAS_FLOATS),y)
  211. CPU_CFLAGS-$(CONFIG_SH2A)+=-m2a
  212. CPU_CFLAGS-$(CONFIG_SH4)+=-m4
  213. else
  214. CPU_CFLAGS-$(CONFIG_SH2A)+=-m2a-nofpu
  215. CPU_CFLAGS-$(CONFIG_SH4)+=-m4-nofpu
  216. endif
  217. endif
  218. ifeq ($(TARGET_ARCH),sh64)
  219. OPTIMIZATION+=-fstrict-aliasing
  220. CPU_LDFLAGS-$(ARCH_LITTLE_ENDIAN):=-EL
  221. CPU_LDFLAGS-$(ARCH_BIG_ENDIAN):=-EB
  222. CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN):=-ml
  223. CPU_CFLAGS-$(ARCH_BIG_ENDIAN):=-mb
  224. CPU_CFLAGS-$(CONFIG_SH5)+=-m5-32media
  225. endif
  226. ifeq ($(TARGET_ARCH),h8300)
  227. CPU_LDFLAGS-$(CONFIG_H8300H)+= -ms8300h
  228. CPU_LDFLAGS-$(CONFIG_H8S) += -ms8300s
  229. CPU_CFLAGS-$(CONFIG_H8300H) += -mh -mint32
  230. CPU_CFLAGS-$(CONFIG_H8S) += -ms -mint32
  231. endif
  232. ifeq ($(TARGET_ARCH),cris)
  233. CPU_LDFLAGS-$(CONFIG_CRIS)+=-mcrislinux
  234. CPU_LDFLAGS-$(CONFIG_CRISV32)+=-mcrislinux
  235. CPU_CFLAGS-$(CONFIG_CRIS)+=-mlinux
  236. PICFLAG:=-fpic
  237. PIEFLAG_NAME:=-fpie
  238. endif
  239. ifeq ($(TARGET_ARCH),m68k)
  240. # -fPIC is only supported for 68020 and above. It is not supported
  241. # for 68000, 68010, or Coldfire.
  242. PICFLAG:=-fpic
  243. PIEFLAG_NAME:=-fpie
  244. endif
  245. ifeq ($(TARGET_ARCH),powerpc)
  246. # PowerPC can hold 8192 entries in its GOT with -fpic which is more than
  247. # enough. Therefore use -fpic which will reduce code size and generates
  248. # faster code.
  249. PICFLAG:=-fpic
  250. PIEFLAG_NAME:=-fpie
  251. PPC_HAS_REL16:=$(shell echo -e "\t.text\n\taddis 11,30,_GLOBAL_OFFSET_TABLE_-.@ha" | $(CC) -c -x assembler -o /dev/null - 2> /dev/null && echo -n y || echo -n n)
  252. CPU_CFLAGS-$(PPC_HAS_REL16)+= -DHAVE_ASM_PPC_REL16
  253. endif
  254. ifeq ($(TARGET_ARCH),frv)
  255. CPU_LDFLAGS-$(CONFIG_FRV)+=-melf32frvfd
  256. # Using -pie causes the program to have an interpreter, which is
  257. # forbidden, so we must make do with -shared. Unfortunately,
  258. # -shared by itself would get us global function descriptors
  259. # and calls through PLTs, dynamic resolution of symbols, etc,
  260. # which would break as well, but -Bsymbolic comes to the rescue.
  261. export LDPIEFLAG:=-shared -Bsymbolic
  262. UCLIBC_LDSO=ld.so.1
  263. endif
  264. # Keep the check_gcc from being needlessly executed
  265. ifndef PIEFLAG
  266. ifneq ($(UCLIBC_BUILD_PIE),y)
  267. export PIEFLAG:=
  268. else
  269. export PIEFLAG:=$(call check_gcc,$(PIEFLAG_NAME),$(PICFLAG))
  270. endif
  271. endif
  272. # We need to keep track of both the CC PIE flag (above) as
  273. # well as the LD PIE flag (below) because we can't rely on
  274. # gcc passing -pie if we used -fPIE
  275. ifndef LDPIEFLAG
  276. ifneq ($(UCLIBC_BUILD_PIE),y)
  277. export LDPIEFLAG:=
  278. else
  279. export LDPIEFLAG:=$(shell $(LD) --help 2>/dev/null | grep -q -- -pie && echo "-Wl,-pie")
  280. endif
  281. endif
  282. # Check for AS_NEEDED support in linker script (binutils>=2.16.1 has it)
  283. ifndef ASNEEDED
  284. ifneq ($(UCLIBC_HAS_SSP),y)
  285. export ASNEEDED:=
  286. else
  287. export ASNEEDED:=$(shell (LD_TMP=$(mktemp LD_XXXXXX) ; echo "GROUP ( AS_NEEDED ( /usr/lib/libc.so ) )" > $LD_TMP && if $(LD) -T $LD_TMP -o /dev/null > /dev/null 2>&1; then echo "AS_NEEDED ( $(UCLIBC_LDSO) )"; else echo "$(UCLIBC_LDSO)"; fi; rm -f $LD_TMP ) )
  288. endif
  289. endif
  290. # Add a bunch of extra pedantic annoyingly strict checks
  291. XWARNINGS=$(subst ",, $(strip $(WARNINGS))) -Wstrict-prototypes -fno-strict-aliasing
  292. ifeq ($(EXTRA_WARNINGS),y)
  293. XWARNINGS+=-Wnested-externs -Wshadow -Wmissing-noreturn -Wmissing-format-attribute -Wformat=2
  294. XWARNINGS+=-Wmissing-prototypes -Wmissing-declarations
  295. XWARNINGS+=-Wnonnull -Wundef
  296. # works only w/ gcc-3.4 and up, can't be checked for gcc-3.x w/ check_gcc()
  297. #XWARNINGS+=-Wdeclaration-after-statement
  298. endif
  299. XARCH_CFLAGS=$(subst ",, $(strip $(ARCH_CFLAGS)))
  300. CPU_CFLAGS=$(subst ",, $(strip $(CPU_CFLAGS-y)))
  301. SSP_DISABLE_FLAGS ?= $(call check_gcc,-fno-stack-protector,)
  302. ifeq ($(UCLIBC_BUILD_SSP),y)
  303. SSP_CFLAGS := $(call check_gcc,-fno-stack-protector-all,)
  304. SSP_CFLAGS += $(call check_gcc,-fstack-protector,)
  305. SSP_ALL_CFLAGS ?= $(call check_gcc,-fstack-protector-all,)
  306. else
  307. SSP_CFLAGS := $(SSP_DISABLE_FLAGS)
  308. endif
  309. # Some nice CFLAGS to work with
  310. CFLAGS := -include $(top_builddir)include/libc-symbols.h \
  311. $(XWARNINGS) $(CPU_CFLAGS) $(SSP_CFLAGS) \
  312. -fno-builtin -nostdinc -I$(top_builddir)include -I.
  313. ifneq ($(strip $(UCLIBC_EXTRA_CFLAGS)),"")
  314. CFLAGS += $(subst ",, $(UCLIBC_EXTRA_CFLAGS))
  315. endif
  316. LDADD_LIBFLOAT=
  317. ifeq ($(UCLIBC_HAS_SOFT_FLOAT),y)
  318. # If -msoft-float isn't supported, we want an error anyway.
  319. # Hmm... might need to revisit this for arm since it has 2 different
  320. # soft float encodings.
  321. ifneq ($(TARGET_ARCH),nios)
  322. ifneq ($(TARGET_ARCH),nios2)
  323. CFLAGS += -msoft-float
  324. endif
  325. endif
  326. ifeq ($(TARGET_ARCH),arm)
  327. # No longer needed with current toolchains, but leave it here for now.
  328. # If anyone is actually still using gcc 2.95 (say), they can uncomment it.
  329. # LDADD_LIBFLOAT=-lfloat
  330. endif
  331. endif
  332. # Make sure "char" behavior is the same everywhere
  333. CFLAGS += -fsigned-char
  334. # We need this to be checked within libc-symbols.h
  335. ifneq ($(HAVE_SHARED),y)
  336. CFLAGS += -DSTATIC
  337. endif
  338. # only i386 is known to work if compile.S gets -D__ASSEMBLER__
  339. #CFLAGS += $(call check_gcc,-std=c99,)
  340. LDFLAGS_NOSTRIP:=$(CPU_LDFLAGS-y) -shared --warn-common --warn-once -z combreloc
  341. # binutils-2.16.1 warns about ignored sections, 2.16.91.0.3 and newer are ok
  342. #LDFLAGS_NOSTRIP+=$(call check_ld,--gc-sections)
  343. ifeq ($(UCLIBC_BUILD_RELRO),y)
  344. LDFLAGS_NOSTRIP+=-z relro
  345. endif
  346. ifeq ($(UCLIBC_BUILD_NOW),y)
  347. LDFLAGS_NOSTRIP+=-z now
  348. endif
  349. LDFLAGS:=$(LDFLAGS_NOSTRIP) -z defs
  350. ifeq ($(DODEBUG),y)
  351. #CFLAGS += -g3
  352. CFLAGS += -O0 -g3
  353. else
  354. CFLAGS += $(OPTIMIZATION) $(XARCH_CFLAGS)
  355. endif
  356. ifeq ($(DOSTRIP),y)
  357. LDFLAGS += -s
  358. else
  359. STRIPTOOL := true -Stripping_disabled
  360. endif
  361. ifeq ($(DOMULTI),y)
  362. # we try to compile all sources at once into an object (IMA), but
  363. # gcc-3.3.x does not support it
  364. # gcc-3.4.x supports it, but does not need and support --combine. though fails on many sources
  365. # gcc-4.0.x supports it, supports the --combine flag, but does not need it
  366. # gcc-4.1(200506xx) supports it, but needs the --combine flag, else libs are useless
  367. ifeq ($(GCC_MAJOR_VER),3)
  368. DOMULTI:=n
  369. else
  370. CFLAGS+=$(call check_gcc,--combine,)
  371. endif
  372. else
  373. DOMULTI:=n
  374. endif
  375. ifeq ($(UCLIBC_HAS_THREADS),y)
  376. ifeq ($(UCLIBC_HAS_THREADS_NATIVE),y)
  377. PTNAME := nptl
  378. else
  379. ifeq ($(LINUXTHREADS_OLD),y)
  380. PTNAME := linuxthreads.old
  381. else
  382. PTNAME := linuxthreads
  383. endif
  384. endif
  385. PTDIR := $(top_builddir)libpthread/$(PTNAME)
  386. # set up system dependencies include dirs (NOTE: order matters!)
  387. ifeq ($(UCLIBC_HAS_THREADS_NATIVE),y)
  388. PTINC:= -I$(PTDIR) \
  389. -I$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH) \
  390. -I$(PTDIR)/sysdeps/$(TARGET_ARCH) \
  391. -I$(PTDIR)/sysdeps/unix/sysv/linux \
  392. -I$(PTDIR)/sysdeps/pthread \
  393. -I$(PTDIR)/sysdeps/pthread/bits \
  394. -I$(PTDIR)/sysdeps/generic \
  395. -I$(top_srcdir)ldso/ldso/$(TARGET_ARCH) \
  396. -I$(top_srcdir)ldso/include
  397. #
  398. # Test for TLS if NPTL support was selected.
  399. #
  400. GCC_HAS_TLS=$(shell \
  401. echo "extern __thread int foo;" | $(CC) -o /dev/null -S -xc - 2>&1)
  402. ifneq ($(GCC_HAS_TLS),)
  403. gcc_tls_test_fail:
  404. @echo "####";
  405. @echo "#### Your compiler does not support TLS and you are trying to build uClibc";
  406. @echo "#### with NPTL support. Upgrade your binutils and gcc to versions which";
  407. @echo "#### support TLS for your architecture. Do not contact uClibc maintainers";
  408. @echo "#### about this problem.";
  409. @echo "####";
  410. @echo "#### Exiting...";
  411. @echo "####";
  412. @exit 1;
  413. endif
  414. else
  415. PTINC := \
  416. -I$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH) \
  417. -I$(PTDIR)/sysdeps/$(TARGET_ARCH) \
  418. -I$(PTDIR)/sysdeps/unix/sysv/linux \
  419. -I$(PTDIR)/sysdeps/pthread \
  420. -I$(PTDIR) \
  421. -I$(top_builddir)libpthread
  422. endif
  423. CFLAGS+=$(PTINC)
  424. else
  425. PTNAME :=
  426. PTINC :=
  427. endif
  428. CFLAGS += -I$(KERNEL_HEADERS)
  429. # Sigh, some stupid versions of gcc can't seem to cope with '-iwithprefix include'
  430. #CFLAGS+=-iwithprefix include
  431. CFLAGS+=-isystem $(shell $(CC) -print-file-name=include)
  432. ifneq ($(DOASSERTS),y)
  433. CFLAGS+=-DNDEBUG
  434. endif
  435. # Keep the check_as from being needlessly executed
  436. ifndef ASFLAGS_NOEXEC
  437. ifeq ($(UCLIBC_BUILD_NOEXECSTACK),y)
  438. export ASFLAGS_NOEXEC := $(call check_as,--noexecstack)
  439. else
  440. export ASFLAGS_NOEXEC :=
  441. endif
  442. endif
  443. ASFLAGS = $(ASFLAGS_NOEXEC)
  444. LIBGCC_CFLAGS ?= $(CFLAGS) $(CPU_CFLAGS-y)
  445. LIBGCC:=$(shell $(CC) $(LIBGCC_CFLAGS) -print-libgcc-file-name)
  446. LIBGCC_DIR:=$(dir $(LIBGCC))
  447. # moved from libpthread/linuxthreads
  448. ifeq ($(UCLIBC_CTOR_DTOR),y)
  449. SHARED_START_FILES:=$(top_builddir)lib/crti.o $(LIBGCC_DIR)crtbeginS.o
  450. SHARED_END_FILES:=$(LIBGCC_DIR)crtendS.o $(top_builddir)lib/crtn.o
  451. endif