# Copyright 1999-2005 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# $Header: /var/cvsroot/gentoo-x86/dev-lang/ghc/ghc-6.4.ebuild,v 1.4 2005/03/25 17:53:04 kosmikus Exp $

# Brief explanation of the bootstrap logic:
#
# ghc requires ghc-bin to bootstrap.
# Therefore, 
# (1) both ghc-bin and ghc provide virtual/ghc
# (2) virtual/ghc *must* default to ghc-bin
# (3) ghc depends on virtual/ghc
#
# This solution has the advantage that the binary distribution
# can be removed once an forall after the first succesful install
# of ghc.

inherit base flag-o-matic eutils ghc-package

IUSE="doc java opengl"

DESCRIPTION="The Glasgow Haskell Compiler"
HOMEPAGE="http://www.haskell.org/ghc/"

# discover if this is a snapshot release
IS_SNAPSHOT="${PV%%*pre*}" # zero if snapshot
MY_PV="${PV/_pre/.}"
MY_P="${PN}-${MY_PV}"
EXTRA_SRC_URI="${MY_PV}"
[[ -z "${IS_SNAPSHOT}" ]] && EXTRA_SRC_URI="stable/dist"

SRC_URI="http://www.haskell.org/ghc/dist/${EXTRA_SRC_URI}/${MY_P}-src.tar.bz2"

LICENSE="as-is"
SLOT="0"
KEYWORDS="~x86 ~ppc -alpha ~amd64 -sparc"

S="${WORKDIR}/${MY_P}"

PROVIDE="virtual/ghc"
# FIXME: Add USE support for parallel haskell (requires PVM)
#	 Get PVM from ftp://ftp.netlib.org/pvm3/
DEPEND="virtual/ghc
	>=dev-lang/perl-5.6.1
	>=sys-devel/gcc-2.95.3
	>=sys-devel/make-3.79.1
	>=sys-apps/sed-3.02.80
	>=sys-devel/flex-2.5.4a
	>=dev-libs/gmp-4.1
	>=sys-libs/readline-4.2
	doc? (  ~app-text/docbook-xml-dtd-4.2
		app-text/docbook-xsl-stylesheets
		>=dev-libs/libxslt-1.1.2
		>=dev-haskell/haddock-0.6-r2
		java? ( >=dev-java/fop-0.20.5 ) )
	opengl? ( virtual/opengl
		virtual/glu
		virtual/glut )"

RDEPEND="virtual/libc
	>=sys-devel/gcc-2.95.3
	>=dev-lang/perl-5.6.1
	>=dev-libs/gmp-4.1
	>=sys-libs/readline-4.2
	opengl? ( virtual/opengl virtual/glu virtual/glut )"

SUPPORTED_CFLAGS=""

# Setup supported CFLAGS.
check_cflags() {
	OLD_CFLAGS="${CFLAGS}"
	CFLAGS="$1"
	strip-unsupported-flags
	SUPPORTED_CFLAGS="${SUPPORTED_CFLAGS} ${CFLAGS}"
	CFLAGS="${OLD_CFLAGS}"
}

setup_cflags() {
	check_cflags "-nopie -fno-stack-protector -fno-stack-protector-all"
}

# Portage's resolution of virtuals fails on virtual/ghc in some Portage releases,
# the following function causes the build to fail with an informative error message
# in such a case.
pkg_setup() {
	if ! has_version virtual/ghc; then
		eerror "This ebuild needs a version of GHC to bootstrap from."
		eerror "Please emerge dev-lang/ghc-bin to get a binary version."
		eerror "You can either use the binary version directly or emerge"
		eerror "dev-lang/ghc afterwards."
		die "virtual/ghc version required to build"
	fi
}

src_unpack() {
	base_src_unpack

	# hardened-gcc needs to be disabled, because the
	# mangler doesn't accept its output; yes, the 6.2 version
	# should do ...
	cd ${S}/ghc
	pushd driver
	setup_cflags

	epatch ${FILESDIR}/${PN}-6.2.hardened.patch
	sed -i -e "s|@GHC_CFLAGS@|${SUPPORTED_CFLAGS// -/ -optc-}|" ghc/ghc.sh
	sed -i -e "s|@GHC_CFLAGS@|${SUPPORTED_CFLAGS// -/ -optc-}|" ghci/ghci.sh
	popd

	cd docs/users_guide/
	# use versionator or something
	# epatch ${FILESDIR}/ghc-6.4-docbook.patch

	cd ${S}/libraries
	sed -i -e "s|I/O|I\\\\/O|" template-haskell/Language/Haskell/TH/Syntax.hs
}

src_compile() {
	local myconf
	local mydoc

	if use opengl; then
		myconf="--enable-hopengl"
	fi

	# initialize build.mk
	echo '# Gentoo changes' > mk/build.mk

	# determine what to do with documentation
	if use doc; then
		mydoc="html"
		if use java; then
			mydoc="${mydoc} ps"
		fi
	else
		mydoc=""
		# needed to prevent haddock from being called
		echo NO_HADDOCK_DOCS=YES >> mk/build.mk
	fi
	echo XMLDocWays="${mydoc}" >> mk/build.mk

	# disable the automatic PIC building which is considered as Prologue Junk by the Haskell Compiler
	# thanks to Peter Simons for finding this and giving notice on bugs.gentoo.org
	# (this is still necessary, even though we have the patch, because
	# we might be bootstrapping from a version that didn't have the
	# patch included)
	setup_cflags
	echo "SRC_CC_OPTS+=${SUPPORTED_CFLAGS}" >> mk/build.mk
	echo "SRC_HC_OPTS+=${SUPPORTED_CFLAGS// -/ -optc-}" >> mk/build.mk

	# force the config variable ArSupportsInput to be unset;
	# ar in binutils >= 2.14.90.0.8-r1 seems to be classified
	# incorrectly by the configure script
	echo "ArSupportsInput:=" >> mk/build.mk

	# Required for some architectures, because they don't support ghc fully ...
	use ppc || use amd64 && echo "SplitObjs=NO" >> mk/build.mk
	use amd64 && echo "GhcWithInterpreter=NO" >> mk/build.mk

	# (--enable-threaded-rts is no longer needed)
	econf ${myconf} || die "econf failed"

	# the build does not seem to work all that
	# well with parallel make
	emake -j1 all || die "make failed"

	# if documentation has been requested, build documentation ...
	# if use doc; then
	# 	emake -j1 html || die "make html failed"
	# 	if use java; then
	# 		emake -j1 ps || die "make ps failed"
	# 	fi
	# fi

}

src_install () {
	local insttarget

	insttarget="install"
	use doc && insttarget="${insttarget} install-docs"

	# the libdir0 setting is needed for amd64, and does not
	# harm for other arches
	emake -j1 ${insttarget} \
		prefix="${D}/usr" \
		datadir="${D}/usr/share/doc/${PF}" \
		infodir="${D}/usr/share/info" \
		mandir="${D}/usr/share/man" \
		libdir0="${D}/usr/$(get_libdir)" \
		|| die "make ${insttarget} failed"

	#need to remove ${D} from ghcprof script
	cd ${D}/usr/bin
	mv ghcprof ghcprof-orig
	sed -e 's:$FPTOOLS_TOP_ABS:#$FPTOOLS_TOP_ABS:' ghcprof-orig > ghcprof
	chmod a+x ghcprof
	rm -f ghcprof-orig

	cd ${S}/ghc
	dodoc README ANNOUNCE LICENSE VERSION

	dosbin ${FILESDIR}/ghc-updater
}

pkg_postinst () {
	ghc-reregister
	einfo "If you have dev-lang/ghc-bin installed, you might"
	einfo "want to unmerge it. It is no longer needed."
	einfo " "
	ewarn "If you upgrade from another ghc version, please run"
	ewarn "/usr/sbin/ghc-updater to re-merge all ghc-based"
	ewarn "Haskell libraries."
}