# Copyright 1999-2011 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# $Header: /var/cvsroot/gentoo-x86/sys-libs/glibc/files/eblits/pkg_setup.eblit,v 1.10 2011/12/14 16:42:46 vapier Exp $

glibc_compile_test() {
	local ret save_cflags=${CFLAGS}
	CFLAGS+=" $1"
	shift

	pushd "${T}" >/dev/null

	rm -f glibc-test*
	printf '%b' "$*" > glibc-test.c

	emake -s glibc-test
	ret=$?

	popd >/dev/null

	CFLAGS=${save_cflags}
	return ${ret}
}

glibc_run_test() {
	local ret

	if [[ ${EMERGE_FROM} == "binary" ]] ; then
		# ignore build failures when installing a binary package #324685
		glibc_compile_test "" "$@" 2>/dev/null || return 0
	else
		if ! glibc_compile_test "" "$@" ; then
			ewarn "Simple build failed ... assuming this is desired #324685"
			return 0
		fi
	fi

	pushd "${T}" >/dev/null

	./glibc-test
	ret=$?
	rm -f glibc-test*

	popd >/dev/null

	return ${ret}
}

eblit-glibc-pkg_setup() {
	# prevent native builds from downgrading ... maybe update to allow people
	# to change between diff -r versions ? (2.3.6-r4 -> 2.3.6-r2)
	if [[ ${ROOT} == "/" ]] && [[ ${CBUILD} == ${CHOST} ]] && [[ ${CHOST} == ${CTARGET} ]] ; then
		if has_version '>'${CATEGORY}/${PF} ; then
			eerror "Sanity check to keep you from breaking your system:"
			eerror " Downgrading glibc is not supported and a sure way to destruction"
			die "aborting to save your system"
		fi

		if ! glibc_run_test '#include <pwd.h>\nint main(){return getpwuid(0)==0;}\n'
		then
			eerror "Your patched vendor kernel is broken.  You need to get an"
			eerror "update from whoever is providing the kernel to you."
			eerror "http://sourceware.org/bugzilla/show_bug.cgi?id=5227"
			eerror "http://bugs.gentoo.org/262698"
			die "keeping your system alive, say thank you"
		fi

		if ! glibc_run_test '#include <unistd.h>\n#include <sys/syscall.h>\nint main(){return syscall(1000)!=-1;}\n'
		then
			eerror "Your old kernel is broken.  You need to update it to"
			eerror "a newer version as syscall(<bignum>) will break."
			eerror "http://bugs.gentoo.org/279260"
			die "keeping your system alive, say thank you"
		fi
	fi

	# users have had a chance to phase themselves, time to give em the boot
	if [[ -e ${ROOT}/etc/locale.gen ]] && [[ -e ${ROOT}/etc/locales.build ]] ; then
		eerror "You still haven't deleted ${ROOT}/etc/locales.build."
		eerror "Do so now after making sure ${ROOT}/etc/locale.gen is kosher."
		die "lazy upgrader detected"
	fi

	if [[ ${CTARGET} == i386-* ]] ; then
		eerror "i386 CHOSTs are no longer supported."
		eerror "Chances are you don't actually want/need i386."
		eerror "Please read http://www.gentoo.org/doc/en/change-chost.xml"
		die "please fix your CHOST"
	fi

	if [[ -e /proc/xen ]] && [[ $(tc-arch) == "x86" ]] && ! is-flag -mno-tls-direct-seg-refs ; then
		ewarn "You are using Xen but don't have -mno-tls-direct-seg-refs in your CFLAGS."
		ewarn "This will result in a 50% performance penalty when running with a 32bit"
		ewarn "hypervisor, which is probably not what you want."
	fi

	use hardened && ! gcc-specs-pie && \
		ewarn "PIE hardening not applied, as your compiler doesn't default to PIE"

	# Make sure host system is up to date #394453
	if has_version '<sys-libs/glibc-2.13' && \
	   [[ -n $(scanelf -qys__guard -F'#s%F' "${ROOT}"/lib*/l*-*.so) ]]
	then
		ebegin "Scanning system for __guard to see if you need to rebuild first ..."
		local files=$(
			scanelf -qys__guard -F'#s%F' \
				"${ROOT}"/*bin/ \
				"${ROOT}"/lib* \
				"${ROOT}"/usr/*bin/ \
				"${ROOT}"/usr/lib* | \
				egrep -v \
					-e "^${ROOT}/lib.*/(libc|ld)-2.*.so$" \
					-e "^${ROOT}/sbin/(ldconfig|sln)$"
		)
		[[ -z ${files} ]]
		if ! eend $? ; then
			eerror "Your system still has old SSP __guard symbols.  You need to"
			eerror "rebuild all the packages that provide these files first:"
			eerror "${files}"
			die "old __guard detected"
		fi
	fi
}