# Copyright 1999-2004 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# $Header: /var/cvsroot/gentoo-x86/eclass/gnat.eclass,v 1.11 2005/12/15 12:06:30 george Exp $
#
# This eclass provides the framework for ada lib installation with the split and
# SLOTted gnat compilers (gnat-xxx, gnatbuild.eclass). Each lib gets built once
# for every installed gnat compiler. Activation of a particular bunary module is
# performed by eselect-gnat, when the active compiler gets switched
#
# The ebuilds should define the lib_compile and lib_install functions that are
# called from the (exported) gnat_src_compile function of eclass. These
# functions should operate similarly to the starndard src_compile and
# src_install. The only difference, that they should use $SL variable instead of
# $S (this is where the working cop of source is held) and $DL instead of $D as
# its installation point.

inherit flag-o-matic

EXPORT_FUNCTIONS pkg_setup src_unpack src_compile

DESCRIPTION="Common procedures for building Ada libs using split gnat compilers"


# ----------------------------------
# Globals

# Locations
# Gnat profile dependent files go under under ${LibTop}/${Gnat_Profile}/${PN}
# and common files go unde SpecsDir, DataDir
PREFIX=/usr
AdalibSpecsDir=${PREFIX}/include/ada
AdalibDataDir=${PREFIX}/share/ada
AdalibLibTop=${PREFIX}/lib/ada

# build-time locations
# SL is a "localized" S, - location where sources are copied for
# profile-specific build
SL=${WORKDIR}/LocalSource

# DL is a "localized destination", where ARCH/SLOT dependent binaries should be
# installed in lib_install 
DL=${WORKDIR}/LocalDest

# location of cleaned-up eselect script, for sourcing
EselectScript=${WORKDIR}/gnat.eselect

# file containing environment formed by gnat-eselect (build-time)
BuildEnv=${WORKDIR}/BuildEnv

# environment for installed lib. Profile-specific stuff should use %DL% as a top
# of their location. This (%DL%) will be substituted with a proper location upon
# install
LibEnv=${WORKDIR}/LibEnv


# env file prepared by gnat.eselect only listsnew settings for env vars
# we need to change that to prepend, rather than replace action..
# Takes one argument - the file to expand. This file should contain only
# var=value like lines.. (commenst are Ok)
expand_BuildEnv() {
	local line
	for line in $(cat $1); do
		EnvVar=$(echo ${line}|cut -d"=" -f1)
		echo "export ${line}:\${${EnvVar}}" >> $1.tmp
	done
	mv $1.tmp $1
}

# ------------------------------------
# Functions

# Checks the gnat backend SLOT and filters flags correspondingly
# To be called from scr_compile for each profile, before actual compilation
# takes one optional parameter, which defaults to SLOT if omitted
gnat_filter_flags() {
	# We should probably check which GNAT is installed and
	# filter flags accordingly. This version is overly protective.

	filter-mfpmath sse 387

	filter-flags -mmmx -msse -mfpmath -frename-registers \
		-fprefetch-loop-arrays -falign-functions=4 -falign-jumps=4 \
		-falign-loops=4 -msse2 -frerun-loop-opt -maltivec -mabi=altivec \
		-fsigned-char -fno-strict-aliasing -pipe

	export ADACFLAGS=${ADACFLAGS:-${CFLAGS}}
	export ADACFLAGS=${ADACFLAGS//pentium-mmx/i586}
	export ADACFLAGS=${ADACFLAGS//pentium[234]/i686}
	export ADACFLAGS=${ADACFLAGS//k6-[23]/k6}
	export ADACFLAGS=${ADACFLAGS//athlon-tbird/i686}
	export ADACFLAGS=${ADACFLAGS//athlon-4/i686}
	export ADACFLAGS=${ADACFLAGS//athlon-[xm]p/i686}
	#the following two break the oncoming amd64 support
	#will completely remove when gnat-3.44 is unmasked
#	export ADACFLAGS=${ADACFLAGS//athlon64/i686}
#	export ADACFLAGS=${ADACFLAGS//athlon/i686}
	export ADACFLAGS=${ADACFLAGS//-Os/-O2}

	export ADAMAKEFLAGS=${ADAMAKEFLAGS:-"-cargs ${ADACFLAGS} -margs"}
	export ADABINDFLAGS=${ADABINDFLAGS:-""}
}

gnat_pkg_setup() {
	export ADAC=${ADAC:-gnatgcc}
	export ADAMAKE=${ADAMAKE:-gnatmake}
	export ADABIND=${ADABIND:-gnatbind}
}


gnat_src_unpack() {
	unpack ${A}
	cat /usr/share/eselect/modules/gnat.eselect | \
		grep -v svn_date_to_version | \
		grep -v DESCRIPTION >	${EselectScript}
}

# Cycles through installed gnat profiles and calls lib_compile and then
# lib_install in turn.
# Use this function to build/install profile-specific binaries. The code
# building/installing common stuff (docs, etc) can go before/after, as needed,
# so that it is called only once..
gnat_src_compile() {
	# We source the eselect-gnat module and use its functions directly, instead of
	# duplicating code or trying to violate sandbox in some way..
	. ${EselectScript} || die "cannot source eselect-gnat module"

	compilers=( $(find_compilers ) )
	if [[ -n ${compilers[@]} ]] ; then
		local i
		for (( i = 0 ; i < ${#compilers[@]} ; i = i + 1 )) ; do
			# copy sources
			mkdir ${DL}
			cp -dpR ${S} ${SL}
			# setup environment
			# As eselect-gnat also manages the libs, this will ensure the right
			# lib profiles are activated too (in case we depend on some Ada lib)
			do_set ${compilers[${i}]} ${BuildEnv}
			expand_BuildEnv ${BuildEnv}
			. ${BuildEnv}
			# call compilation callback
			cd ${SL}
			lib_compile
			# call install callback
			lib_install
			# move installed and cleanup
			mv ${DL} ${DL}-${compilers[${i}]}
			rm -rf ${SL}
		done
	else
		die "please make sure you have at least one gnat compiler installed!"
	fi
}


# This function simply moves gnat-profile-specific stuff into proper locations.
# Use src_install in ebuild to install the rest of the package
gnat_src_install() {
	# prep lib specs directory
	. ${EselectScript} || die "cannot source eselect-gnat module"
	dodir ${SPECSDIR}/${PN}

	compilers=( $(find_compilers ) )
	if [[ -n ${compilers[@]} ]] ; then
		local i
		for (( i = 0 ; i < ${#compilers[@]} ; i = i + 1 )) ; do
			local DLlocation=${AdalibLibTop}/${compilers[${i}]}
			dodir ${DLlocation}
			cp -dpR "${DL}-${compilers[${i}]}" "${D}/${DLlocation}/${PN}"
			# create profile-specific specs file
			cp ${LibEnv} ${D}/${SPECSDIR}/${PN}/${compilers[${i}]}
			sed -i -e "s:%DL%:${DLlocation}/${PN}:g" ${D}/${SPECSDIR}/${PN}/${compilers[${i}]}
		done
	else
		die || "please make sure you have at least one gnat compiler installed!"
	fi
}