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Add infrastructure to install lld as the default linker.  The old GNU linker
will be installed as /usr/bin/ld.bfd on supported systems.  This allows
users to fall back on the old linker by using the -fuse-ld=bfd option on
systems where lld is the default linker.

Switch armv7 to use lld as the default linker.  On arm64 we already use lld
as the default linker.  Other platforms will keep using the GNU linker for
now.

ok patrick@, deraadt@, phessler@

#	$OpenBSD: bsd.own.mk,v 1.190 2018/07/26 13:20:53 kettenis Exp $
#	$NetBSD: bsd.own.mk,v 1.24 1996/04/13 02:08:09 thorpej Exp $

# Host-specific overrides
.if defined(MAKECONF) && exists(${MAKECONF})
.include "${MAKECONF}"
.elif exists(/etc/mk.conf)
.include "/etc/mk.conf"
.endif

# Set `WARNINGS' to `yes' to add appropriate warnings to each compilation
WARNINGS?=	no
# Set `SKEY' to `yes' to build with support for S/key authentication.
SKEY?=		yes
# Set `YP' to `yes' to build with support for NIS/YP.
YP?=		yes

CLANG_ARCH=aarch64 amd64 arm i386 sparc64
GCC4_ARCH=alpha hppa mips64 mips64el powerpc sh sparc64
GCC3_ARCH=m88k
LLD_ARCH=aarch64 arm

# m88k: ?
PIE_ARCH=alpha amd64 arm hppa i386 mips64 mips64el powerpc sh sparc64
STATICPIE_ARCH=alpha amd64 arm hppa i386 mips64 mips64el powerpc sh sparc64

.for _arch in ${MACHINE_ARCH}
.if !empty(GCC3_ARCH:M${_arch})
COMPILER_VERSION?=gcc3
.elif !empty(GCC4_ARCH:M${_arch})
COMPILER_VERSION?=gcc4
.elif !empty(CLANG_ARCH:M${_arch})
COMPILER_VERSION?=clang
.endif

.if !empty(GCC3_ARCH:M${_arch})
BUILD_GCC3?=yes
.else
BUILD_GCC3?=no
.endif
.if !empty(GCC4_ARCH:M${_arch}) || ${MACHINE_ARCH} == "amd64" || \
    ${MACHINE_ARCH} == "arm" || ${MACHINE_ARCH} == "i386"
BUILD_GCC4?=yes
.else
BUILD_GCC4?=no
.endif
.if !empty(CLANG_ARCH:M${_arch})
BUILD_CLANG?=yes
.else
BUILD_CLANG?=no
.endif

.if !empty(LLD_ARCH:M${_arch})
LINKER_VERSION?=lld
.else
LINKER_VERSION?=bfd
.endif

.if !empty(STATICPIE_ARCH:M${_arch})
STATICPIE?=-pie
.endif

.if !empty(PIE_ARCH:M${_arch})
NOPIE_FLAGS?=-fno-pie
NOPIE_LDFLAGS?=-nopie
PIE_DEFAULT?=${DEFAULT_PIE_DEF}
.else
NOPIE_FLAGS?=
PIE_DEFAULT?=
.endif
.endfor

# where the system object and source trees are kept; can be configurable
# by the user in case they want them in ~/foosrc and ~/fooobj, for example
BSDSRCDIR?=	/usr/src
BSDOBJDIR?=	/usr/obj

BINGRP?=	bin
BINOWN?=	root
BINMODE?=	555
NONBINMODE?=	444
DIRMODE?=	755

SHAREDIR?=	/usr/share
SHAREGRP?=	bin
SHAREOWN?=	root
SHAREMODE?=	${NONBINMODE}

MANDIR?=	/usr/share/man/man
MANGRP?=	bin
MANOWN?=	root
MANMODE?=	${NONBINMODE}

LIBDIR?=	/usr/lib
LIBGRP?=	${BINGRP}
LIBOWN?=	${BINOWN}
LIBMODE?=	${NONBINMODE}

DOCDIR?=	/usr/share/doc
DOCGRP?=	bin
DOCOWN?=	root
DOCMODE?=	${NONBINMODE}

LOCALEDIR?=	/usr/share/locale
LOCALEGRP?=	wheel
LOCALEOWN?=	root
LOCALEMODE?=	${NONBINMODE}

.if !defined(CDIAGFLAGS)
CDIAGFLAGS=	-Wall -Wpointer-arith -Wuninitialized -Wstrict-prototypes
CDIAGFLAGS+=	-Wmissing-prototypes -Wunused -Wsign-compare
CDIAGFLAGS+=	-Wshadow
.  if ${COMPILER_VERSION} == "gcc4"
CDIAGFLAGS+=	-Wdeclaration-after-statement
.  endif
.endif

# Shared files for system gnu configure, not used yet
GNUSYSTEM_AUX_DIR?=${BSDSRCDIR}/share/gnu

INSTALL_COPY?=	-c
.ifndef DEBUG
INSTALL_STRIP?=	-s
.endif

STATIC?=	-static ${STATICPIE}

# Define SYS_INCLUDE to indicate whether you want symbolic links to the system
# source (``symlinks''), or a separate copy (``copies''); (latter useful
# in environments where it's not possible to keep /sys publicly readable)
#SYS_INCLUDE= 	symlinks

# pic relocation flags.
.if (${MACHINE_ARCH} == "alpha") || (${MACHINE_ARCH} == "sparc64")
PICFLAG?=-fPIC
.else
PICFLAG?=-fpic
.endif

.if ${MACHINE_ARCH} == "alpha" || ${MACHINE_ARCH} == "powerpc" || \
    ${MACHINE_ARCH} == "sparc64"
# big PIE
DEFAULT_PIE_DEF=-DPIE_DEFAULT=2
.else
# small pie
DEFAULT_PIE_DEF=-DPIE_DEFAULT=1
.endif

# don't try to generate PROFILED versions of libraries on machines
# which don't support profiling.
.if 0
NOPROFILE=
.endif

BUILDUSER?= build
WOBJGROUP?= wobj
WOBJUMASK?= 007

BSD_OWN_MK=Done

.PHONY: spell clean cleandir obj manpages print all \
	depend beforedepend afterdepend cleandepend subdirdepend \
	all cleanman includes \
	beforeinstall realinstall maninstall afterinstall install