[thirdparty/gcc.git] / config / picflag.m4

# _GCC_PICFLAG(FLAG, DISPATCH)
# ----------------------------
# Store PIC flag corresponding to DISPATCH triplet in FLAG.
# Explit use of -fpic in CFLAGS corresponding to FLAG overrides default.
AC_DEFUN([_GCC_PICFLAG], [

case "${$2}" in
    # PIC is the default on some targets or must not be used.
    *-*-darwin*)
	# PIC is the default on this platform
	# Common symbols not allowed in MH_DYLIB files
	$1=-fno-common
	;;
    alpha*-dec-osf5*)
	# PIC is the default.
	;;
    hppa*64*-*-hpux*)
	# PIC is the default for 64-bit PA HP-UX.
	;;
    i[[34567]]86-*-cygwin* | x86_64-*-cygwin*)
	;;
    i[[34567]]86-*-mingw* | x86_64-*-mingw*)
	;;
    i[[34567]]86-*-interix[[3-9]]*)
	# Interix 3.x gcc -fpic/-fPIC options generate broken code.
	# Instead, we relocate shared libraries at runtime.
	;;
    i[[34567]]86-*-nto-qnx*)
	# QNX uses GNU C++, but need to define -shared option too, otherwise
	# it will coredump.
	$1='-fPIC -shared'
	;;
    i[[34567]]86-pc-msdosdjgpp*)
	# DJGPP does not support shared libraries at all.
	;;
    ia64*-*-hpux*)
	# On IA64 HP-UX, PIC is the default but the pic flag
	# sets the default TLS model and affects inlining.
	$1=-fPIC
	;;
    mips-sgi-irix6*)
	# PIC is the default.
	;;
    rs6000-ibm-aix* | powerpc-ibm-aix*)
	# All AIX code is PIC.
	;;

    # Some targets support both -fPIC and -fpic, but prefer the latter.
    # FIXME: Why?
    i[[34567]]86-*-* | x86_64-*-*)
	$1=-fpic
	;;
    # FIXME: Override -fPIC default in libgcc only? 
    sh-*-linux* | sh[[2346lbe]]*-*-linux*)
	$1=-fpic
	;;
    # FIXME: Simplify to sh*-*-netbsd*?
    sh-*-netbsdelf* | shl*-*-netbsdelf* | sh5-*-netbsd* | sh5l*-*-netbsd* | \
      sh64-*-netbsd* | sh64l*-*-netbsd*)
	$1=-fpic
	;;
    # Default to -fPIC unless specified otherwise.
    *)
	$1=-fPIC
	;;
esac

# If the user explicitly uses -fpic/-fPIC, keep that.
case "${m4_bpatsubsts($1, PICFLAG, CFLAGS)}" in
    *-fpic*)
	$1=-fpic
	;;
    *-fPIC*)
	$1=-fPIC
	;;
esac
])

# GCC_PICFLAG
# -----------
# Store host PIC flag in PICFLAG.
AC_DEFUN([GCC_PICFLAG], [
  AC_REQUIRE([AC_CANONICAL_HOST])
  _GCC_PICFLAG([PICFLAG], [host])])

# GCC_PICFLAG_FOR_TARGET
# ----------------------
# Store target PIC flag in PICFLAG_FOR_TARGET.
AC_DEFUN([GCC_PICFLAG_FOR_TARGET], [
  AC_REQUIRE([AC_CANONICAL_TARGET])
  _GCC_PICFLAG([PICFLAG_FOR_TARGET], [target])])
Commit	Line	Data
d89b8910	1	# _GCC_PICFLAG(FLAG, DISPATCH)
	2	# ----------------------------
	3	# Store PIC flag corresponding to DISPATCH triplet in FLAG.
	4	# Explit use of -fpic in CFLAGS corresponding to FLAG overrides default.
	5	AC_DEFUN([_GCC_PICFLAG], [
	6
	7	case "${$2}" in
	8	# PIC is the default on some targets or must not be used.
	9	--darwin*)
	10	# PIC is the default on this platform
	11	# Common symbols not allowed in MH_DYLIB files
	12	$1=-fno-common
	13	;;
	14	alpha-dec-osf5)
	15	# PIC is the default.
	16	;;
	17	hppa64--hpux)
	18	# PIC is the default for 64-bit PA HP-UX.
	19	;;
b0b82c40	20	i[[34567]]86--cygwin \| x86_64--cygwin)
	21	;;
	22	i[[34567]]86--mingw \| x86_64--mingw)
d89b8910	23	;;
af8e12d0	24	i[[34567]]86--interix[[3-9]])
d89b8910	25	# Interix 3.x gcc -fpic/-fPIC options generate broken code.
	26	# Instead, we relocate shared libraries at runtime.
	27	;;
	28	i[[34567]]86--nto-qnx)
	29	# QNX uses GNU C++, but need to define -shared option too, otherwise
	30	# it will coredump.
	31	$1='-fPIC -shared'
	32	;;
	33	i[[34567]]86-pc-msdosdjgpp*)
	34	# DJGPP does not support shared libraries at all.
	35	;;
	36	ia64--hpux*)
	37	# On IA64 HP-UX, PIC is the default but the pic flag
	38	# sets the default TLS model and affects inlining.
	39	$1=-fPIC
	40	;;
	41	mips-sgi-irix6*)
	42	# PIC is the default.
	43	;;
	44	rs6000-ibm-aix* \| powerpc-ibm-aix*)
	45	# All AIX code is PIC.
	46	;;
	47
	48	# Some targets support both -fPIC and -fpic, but prefer the latter.
	49	# FIXME: Why?
	50	i[[34567]]86-- \| x86_64--)
	51	$1=-fpic
	52	;;
d89b8910	53	# FIXME: Override -fPIC default in libgcc only?
	54	sh--linux \| sh[[2346lbe]]--linux*)
	55	$1=-fpic
	56	;;
	57	# FIXME: Simplify to sh--netbsd*?
	58	sh--netbsdelf \| shl--netbsdelf* \| sh5--netbsd \| sh5l--netbsd* \| \
	59	sh64--netbsd \| sh64l--netbsd*)
	60	$1=-fpic
	61	;;
	62	# Default to -fPIC unless specified otherwise.
	63	*)
	64	$1=-fPIC
	65	;;
	66	esac
	67
	68	# If the user explicitly uses -fpic/-fPIC, keep that.
	69	case "${m4_bpatsubsts($1, PICFLAG, CFLAGS)}" in
	70	-fpic)
	71	$1=-fpic
	72	;;
	73	-fPIC)
	74	$1=-fPIC
	75	;;
	76	esac
	77	])
	78
	79	# GCC_PICFLAG
	80	# -----------
	81	# Store host PIC flag in PICFLAG.
	82	AC_DEFUN([GCC_PICFLAG], [
	83	AC_REQUIRE([AC_CANONICAL_HOST])
	84	_GCC_PICFLAG([PICFLAG], [host])])
	85
	86	# GCC_PICFLAG_FOR_TARGET
	87	# ----------------------
	88	# Store target PIC flag in PICFLAG_FOR_TARGET.
	89	AC_DEFUN([GCC_PICFLAG_FOR_TARGET], [
	90	AC_REQUIRE([AC_CANONICAL_TARGET])
	91	_GCC_PICFLAG([PICFLAG_FOR_TARGET], [target])])