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+# Copyright 1999-2015 Gentoo Foundation
+# Distributed under the terms of the GNU General Public License v2
+# $Id$
+EAPI=5
+
+# PyInstaller assumes CPython internals and is hence currently incompatible with
+# alternative interpreters (e.g., PyPy).
+PYTHON_COMPAT=( python{2_7,3_3,3_4,3_5} )
+
+# "waf" requires a threading-enabled Python interpreter.
+PYTHON_REQ_USE='threads(+)'
+
+# Order of operations is significant here. Since we explicitly call "waf-utils"
+# but *NOT* "distutils-r1" phase functions, ensure the latter remain the default
+# by inheriting the latter *AFTER* the former.
+inherit waf-utils distutils-r1
+
+DESCRIPTION="Program converting Python programs into stand-alone executables"
+HOMEPAGE="http://www.pyinstaller.org"
+
+LICENSE="pyinstaller"
+SLOT="0"
+
+IUSE="clang debug doc leak-detector"
+REQUIRED_USE="${PYTHON_REQUIRED_USE}"
+
+#FIXME: Interestingly, PyInstaller itself has no hard or soft dependencies
+#excluding the expected build-time dependency of "setuptools". Its unit tests,
+#however, require an elaborate set of pure-Python packages, C-based Python
+#extensions, and system-wide shared libraries. It's fairly extreme --
+#sufficiently extreme, in fact, that we do *NOT* currently bother. For an
+#exhaustive list of such dependencies, see "tests/test-requirements.txt".
+
+RDEPEND="${PYTHON_DEPS}"
+DEPEND="${RDEPEND}
+	leak-detector? ( dev-libs/boehm-gc )
+	 clang? ( sys-devel/clang )
+	!clang? ( sys-devel/gcc )
+"
+
+# While the typical "waf" project permits "waf" to be run from outside the
+# directory containing "waf", PyInstaller requires "waf" to be run from inside
+# such directory in a relative manner. Ensure this.
+WAF_BINARY="./waf"
+
+# Since the "waf" script bundled with PyInstaller does *NOT* support the
+# conventionel "--libdir" option, prevent such option from being passed.
+NO_WAF_LIBDIR=1
+
+if [[ ${PV} == 9999 ]]; then
+	inherit git-r3
+
+	EGIT_REPO_URI="https://github.com/pyinstaller/pyinstaller"
+	EGIT_BRANCH="develop"
+	SRC_URI=""
+	KEYWORDS=""
+else
+	MY_PN="PyInstaller"
+	MY_P="${MY_PN}-${PV}"
+	SRC_URI="https://github.com/pyinstaller/pyinstaller/releases/download/v${PV}/${MY_P}.tar.gz"
+	KEYWORDS="~amd64 ~x86"
+	S="${WORKDIR}/${MY_P}"
+fi
+
+python_prepare_all() {
+	#FIXME: This is almost certainly wrong. We almost certainly want to use
+	#actual USE flags instead: e.g.,
+	#
+	# local arch_word_size
+	# if use amd64; then
+	# 	  arch_word_size=64
+	# elif use x86; then
+	#     arch_word_size=32
+	# else
+	# 	  die "Architecture \"${ARCH}\" unsupported."
+	# fi
+	
+	# Word size for the current architecture. (There simply *MUST* be a more
+	# Gentooish way of determining this. I couldn't find it. While we should
+	# arguably test "[[ "$(getconf LONG_BIT)" == 64 ]]" instead, such magic is
+	# arguably even kludgier. Your mileage may vary.)
+	local arch_word_size
+	case "${ARCH}" in
+	amd64) arch_word_size=64;;
+	*)     arch_word_size=32;;
+	esac
+
+	# Install only the Linux bootloader specific to:
+	#
+	# * The architecture of the current machine.
+	# * The release type requested for the current installation. Specifically:
+	#   * If the "debug" USE flag is enabled, only install the "run_d" binary.
+	#   * Else, only install the "run" binary.
+	local bootloader_basename='run'
+	use debug && bootloader_basename+='_d'
+	sed -i \
+		-e '/.*bootloader\/\*\/*.*/s~\*/\*~Linux-'${arch_word_size}'bit/'${bootloader_basename}'~' \
+		setup.py || die '"sed" failed.'
+
+	# Prevent badness during compilation. Specifically (in order):
+	# 
+	# * Avoid stripping bootloader binaries.
+	# * Prevent the bootloader from being compiled under:
+	#   * Hard-coded ${CFLAGS}.
+	#   * gcc option "-Werror", converting compiler warnings to errors and hence
+	#     failing on the first (inevitable) warning.
+	sed -i \
+		-e "s~\\(\\s*\\)features\\s*=\\s*'strip'$~\\1pass~" \
+		-e "s~\\(\\s*\\)ctx.env.append_value('CFLAGS', '-O2')$~\\1pass~" \
+		-e "/'CFLAGS',\\s*'-Werror'/d" \
+		bootloader/wscript || die '"sed" failed.'
+
+	# Continue with the default behaviour.
+	distutils-r1_python_prepare_all
+}
+
+python_configure() {
+	# CLI options to be passed to the "waf configure" command run below.
+	local -a waf_configure_options; waf_configure_options=(
+		 # Since Gentoo is *NOT* LSB-compliant, a non-LSB-compliant bootloader
+		 # must be built. Sadly, doing so could reduce the portability of the
+		 # resulting bootloader and hence applications frozen under that
+		 # bootloader. Until Gentoo supplies an ebuild for building at least
+		 # version 4.0 of the LSB tools, there's little we can do here.
+		 --no-lsb
+	)
+	use debug && waf_configure_options+=( --debug )
+	use clang && waf_configure_options+=( --clang )
+	use leak-detector && waf_configure_options+=( --leak-detector )
+
+	# Configure the Linux bootloader.
+	cd bootloader
+	waf-utils_src_configure "${waf_configure_options[@]}"
+
+	# Continue with the default behaviour.
+	cd "${S}"
+	distutils-r1_python_configure
+}
+
+python_compile() {
+	# Compile the non-debug Linux bootloader. Ideally, we would simply call
+	# waf-utils_src_compile() to do so. Unfortunately, that function attempts to
+	# run the "build" WAF task, which for PyInstaller *ALWAYS* fails with the
+	# following fatal error:
+	#
+	#     Call "python waf all" to compile all bootloaders.
+	#
+	# Since the "waf-utils" eclass does *NOT* support running of alternative
+	# tasks, we reimplement waf-utils_src_compile() to do so. (Since this is
+	# lame, we should probably file a feature request with the author of the
+	# "waf-utils" eclass.)
+	cd bootloader
+	local _mywafconfig
+	[[ "${WAF_VERBOSE}" ]] && _mywafconfig="--verbose"
+	local jobs="--jobs=$(makeopts_jobs)"
+	echo "\"${WAF_BINARY}\" build_release ${_mywafconfig} ${jobs}"
+	"${WAF_BINARY}" build_release ${_mywafconfig} ${jobs} ||
+		die "Bootloader compilation failed."
+
+	# Move the binaries for such bootloader to "PyInstaller/bootloader" *BEFORE*
+	# compiling the non-bootloader portion of PyInstaller, which requires such
+	# binaries. (Note that the "install_release" task does *NOT* install files
+	# to ${IMAGE}, despite the "install" in such task name.)
+	"${WAF_BINARY}" install_release || die "Bootloader installation failed."
+
+	# Continue with the default behaviour.
+	cd "${S}"
+	distutils-r1_python_compile
+}
+
+python_install_all() {
+	distutils-r1_python_install_all
+
+	# Install plaintext documentation.
+	dodoc README.rst doc/*.rst
+
+	# If requested, install non-plaintext documentation as well.
+	if use doc; then
+		# Install HTML documentation.
+		dohtml -r doc/*
+
+		# Install PDF documentation.
+		docinto pdf
+		dodoc doc/*.pdf
+	fi
+}