# Copyright 1999-2015 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# $Id$

dump_toolchain_settings() {
	echo

	einfo "$*"

	local v
	for v in ABI CBUILD CHOST CTARGET CBUILD_OPT CTARGET_OPT CC LD {AS,C,CPP,CXX,LD}FLAGS ; do
		einfo " $(printf '%15s' ${v}:)   ${!v}"
	done

	# The glibc configure script doesn't properly use LDFLAGS all the time.
	export CC="$(tc-getCC ${CTARGET}) ${LDFLAGS}"
	einfo " $(printf '%15s' 'Manual CC:')   ${CC}"
	echo
}

glibc_do_configure() {
	# Glibc does not work with gold (for various reasons) #269274.
	tc-ld-disable-gold

	dump_toolchain_settings "Configuring glibc for $1"

	local myconf=()

	# set addons
	pushd "${S}" > /dev/null
	local addons=$(echo */configure | sed \
		-e 's:/configure::g' \
		-e 's:\(linuxthreads\|nptl\|rtkaio\|glibc-compat\)\( \|$\)::g' \
		-e 's: \+$::' \
		-e 's! !,!g' \
		-e 's!^!,!' \
		-e '/^,\*$/d')
	[[ -d ports ]] && addons+=",ports"
	popd > /dev/null

	myconf+=( $(use_enable hardened stackguard-randomization) )
	if has_version '<sys-libs/glibc-2.13' ; then
		myconf+=( --enable-old-ssp-compat )
	fi

	[[ $(tc-is-softfloat) == "yes" ]] && myconf+=( --without-fp )

	if [[ $1 == "linuxthreads" ]] ; then
		if want_tls ; then
			myconf+=( --with-tls )

			if ! want__thread || use glibc-compat20 || [[ ${LT_KER_VER} == 2.[02].* ]] ; then
				myconf+=( --without-__thread )
			else
				myconf+=( --with-__thread )
			fi
		else
			myconf+=( --without-tls --without-__thread )
		fi

		myconf+=( --disable-sanity-checks )
		addons="linuxthreads${addons}"
		myconf+=( --enable-kernel=${LT_KER_VER} )
	elif [[ $1 == "nptl" ]] ; then
		# Newer versions require nptl, so there is no addon for it.
		version_is_at_least 2.20 || addons="nptl${addons}"
		myconf+=( --enable-kernel=${NPTL_KERN_VER} )
	else
		die "invalid pthread option"
	fi
	myconf+=( --enable-add-ons="${addons#,}" )

	# Since SELinux support is only required for nscd, only enable it if:
	# 1. USE selinux
	# 2. only for the primary ABI on multilib systems
	# 3. Not a crosscompile
	if ! is_crosscompile && use selinux ; then
		if use multilib ; then
			if is_final_abi ; then
				myconf+=( --with-selinux )
			else
				myconf+=( --without-selinux )
			fi
		else
			myconf+=( --with-selinux )
		fi
	else
		myconf+=( --without-selinux )
	fi

	# Force a few tests where we always know the answer but
	# configure is incapable of finding it.
	if is_crosscompile ; then
		export \
			libc_cv_c_cleanup=yes \
			libc_cv_forced_unwind=yes
	fi

	myconf+=(
		--without-cvs
		--disable-werror
		--enable-bind-now
		--build=${CBUILD_OPT:-${CBUILD}}
		--host=${CTARGET_OPT:-${CTARGET}}
		$(use_enable profile)
		$(use_with gd)
		--with-headers=$(alt_build_headers)
		--prefix="${EPREFIX}/usr"
		--sysconfdir="${EPREFIX}/etc"
		--localstatedir="${EPREFIX}/var"
		--libdir='$(prefix)'/$(get_libdir)
		--mandir='$(prefix)'/share/man
		--infodir='$(prefix)'/share/info
		--libexecdir='$(libdir)'/misc/glibc
		--with-bugurl=http://bugs.gentoo.org/
		--with-pkgversion="$(glibc_banner)"
		$(use_multiarch || echo --disable-multi-arch)
		$(in_iuse rpc && use_enable rpc obsolete-rpc || echo --enable-obsolete-rpc)
		$(in_iuse systemtap && use_enable systemtap)
		$(in_iuse nscd && use_enable nscd)
		${EXTRA_ECONF}
	)

	# We rely on sys-libs/timezone-data for timezone tools normally.
	if version_is_at_least 2.23 ; then
		myconf+=( $(use_enable vanilla timezone-tools) )
	fi

	# These libs don't have configure flags.
	ac_cv_lib_audit_audit_log_user_avc_message=$(in_iuse audit && usex audit || echo no)
	ac_cv_lib_cap_cap_init=$(in_iuse caps && usex caps || echo no)

	# There is no configure option for this and we need to export it
	# since the glibc build will re-run configure on itself
	export libc_cv_rootsbindir="${EPREFIX}/sbin"
	export libc_cv_slibdir="${EPREFIX}/$(get_libdir)"

	# We take care of patching our binutils to use both hash styles,
	# and many people like to force gnu hash style only, so disable
	# this overriding check.  #347761
	export libc_cv_hashstyle=no

	# Overtime, generating info pages can be painful.  So disable this for
	# versions older than the latest stable to avoid the issue (this ver
	# should be updated from time to time).  #464394 #465816
	if ! version_is_at_least 2.17 ; then
		export ac_cv_prog_MAKEINFO=:
	fi

	local builddir=$(builddir "$1")
	mkdir -p "${builddir}"
	cd "${builddir}"
	set -- "${S}"/configure "${myconf[@]}"
	echo "$@"
	"$@" || die "failed to configure glibc"

	# ia64 static cross-compilers are a pita in so much that they
	# can't produce static ELFs (as the libgcc.a is broken).  so
	# disable building of the programs for those targets if it
	# doesn't work.
	# XXX: We could turn this into a compiler test, but ia64 is
	# the only one that matters, so this should be fine for now.
	if is_crosscompile && [[ ${CTARGET} == ia64* ]] ; then
		sed -i '1i+link-static = touch $@' config.make
	fi

	# If we're trying to migrate between ABI sets, we need
	# to lie and use a local copy of gcc.  Like if the system
	# is built with MULTILIB_ABIS="amd64 x86" but we want to
	# add x32 to it, gcc/glibc don't yet support x32.
	if [[ -n ${GCC_BOOTSTRAP_VER} ]] && use multilib ; then
		echo 'main(){}' > "${T}"/test.c
		if ! $(tc-getCC ${CTARGET}) ${CFLAGS} ${LDFLAGS} "${T}"/test.c -Wl,-emain -lgcc 2>/dev/null ; then
			sed -i -e '/^CC = /s:$: -B$(objdir)/../'"gcc-${GCC_BOOTSTRAP_VER}/${ABI}:" config.make || die
			mkdir -p sunrpc
			cp $(which rpcgen) sunrpc/cross-rpcgen || die
			touch -t 202001010101 sunrpc/cross-rpcgen || die
		fi
	fi
}

toolchain-glibc_headers_configure() {
	export ABI=default

	local builddir=$(builddir "headers")
	mkdir -p "${builddir}"
	cd "${builddir}"

	# if we don't have a compiler yet, we cant really test it now ...
	# hopefully they don't affect header geneation, so let's hope for
	# the best here ...
	local v vars=(
		ac_cv_header_cpuid_h=yes
		libc_cv_{386,390,alpha,arm,hppa,ia64,mips,{powerpc,sparc}{,32,64},sh,x86_64}_tls=yes
		libc_cv_asm_cfi_directives=yes
		libc_cv_broken_visibility_attribute=no
		libc_cv_c_cleanup=yes
		libc_cv_forced_unwind=yes
		libc_cv_gcc___thread=yes
		libc_cv_mlong_double_128=yes
		libc_cv_mlong_double_128ibm=yes
		libc_cv_ppc_machine=yes
		libc_cv_ppc_rel16=yes
		libc_cv_predef_{fortify_source,stack_protector}=no
		libc_cv_visibility_attribute=yes
		libc_cv_z_combreloc=yes
		libc_cv_z_execstack=yes
		libc_cv_z_initfirst=yes
		libc_cv_z_nodelete=yes
		libc_cv_z_nodlopen=yes
		libc_cv_z_relro=yes
		libc_mips_abi=${ABI}
		libc_mips_float=$([[ $(tc-is-softfloat) == "yes" ]] && echo soft || echo hard)
		# These libs don't have configure flags.
		ac_cv_lib_audit_audit_log_user_avc_message=no
		ac_cv_lib_cap_cap_init=no
	)
	einfo "Forcing cached settings:"
	for v in "${vars[@]}" ; do
		einfo " ${v}"
		export ${v}
	done

	# Blow away some random CC settings that screw things up. #550192
	if [[ -d ${S}/sysdeps/mips ]]; then
		pushd "${S}"/sysdeps/mips >/dev/null
		sed -i -e '/^CC +=/s:=.*:= -D_MIPS_SZPTR=32:' mips32/Makefile mips64/n32/Makefile || die
		sed -i -e '/^CC +=/s:=.*:= -D_MIPS_SZPTR=64:' mips64/n64/Makefile || die
		popd >/dev/null
	fi

	local myconf=()
	myconf+=(
		--disable-sanity-checks
		--enable-hacker-mode
		--without-cvs
		--disable-werror
		--enable-bind-now
		--build=${CBUILD_OPT:-${CBUILD}}
		--host=${CTARGET_OPT:-${CTARGET}}
		--with-headers=$(alt_build_headers)
		--prefix="${EPREFIX}/usr"
		${EXTRA_ECONF}
	)

	local addons
	[[ -d ${S}/ports ]] && addons+=",ports"
	# Newer versions require nptl, so there is no addon for it.
	version_is_at_least 2.20 || addons+=",nptl"
	myconf+=( --enable-add-ons="${addons#,}" )

	# Nothing is compiled here which would affect the headers for the target.
	# So forcing CC/CFLAGS is sane.
	set -- "${S}"/configure "${myconf[@]}"
	echo "$@"
	CC="$(tc-getBUILD_CC)" \
	CFLAGS="-O1 -pipe" \
	CPPFLAGS="-U_FORTIFY_SOURCE" \
	LDFLAGS="" \
	"$@" || die "failed to configure glibc"
}

toolchain-glibc_src_configure() {
	if just_headers ; then
		toolchain-glibc_headers_configure
	else
		want_linuxthreads && glibc_do_configure linuxthreads
		want_nptl && glibc_do_configure nptl
	fi
}

eblit-glibc-src_configure() {
	foreach_abi toolchain-glibc_src_configure
}