[gentoo-dev] [PATCH] boost-utils.eclass -- for building against newest boost.

[Michał Górny]

Right now, it just contains the function Tiziano listed in his post[1].
I'd appreciate further ideas, feedback, and possibly an example from
someone who will actually need it.
---
 gx86/eclass/boost-utils.eclass | 43 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)
 create mode 100644 gx86/eclass/boost-utils.eclass

diff --git a/gx86/eclass/boost-utils.eclass b/gx86/eclass/boost-utils.eclass
new file mode 100644
index 0000000..b5a9f55
--- /dev/null
+++ b/gx86/eclass/boost-utils.eclass
@@ -0,0 +1,43 @@
+# Copyright 1999-2012 Gentoo Foundation
+# Distributed under the terms of the GNU General Public License v2
+# $Header: $
+
+if [[ ! ${_BOOST_ECLASS} ]]; then
+
+# @ECLASS: boost-utils.eclass
+# @MAINTAINER:
+# mgorny@g.o
+# @BLURB: helper functions for packages using Boost C++ library
+# @DESCRIPTION:
+# Helper functions to be used when building packages using the Boost C++
+# library collection.
+
+case ${EAPI:-0} in
+	0|1|2|3|4) ;;
+	*) die "${ECLASS}.eclass API in EAPI ${EAPI} not yet established."
+esac
+
+inherit versionator
+
+# @FUNCTION: boost-utils_get_best_slot
+# @DESCRIPTION:
+# Get newest SLOT (major version) of Boost.
+boost-utils_get_best_slot() {
+	local pkg=dev-libs/boost
+	local atom=$(best_version ${pkg})
+	get_version_component_range 1-2 ${atom#${pkg}}
+}
+
+# @FUNCTION: boost-utils_get_includedir
+# @DESCRIPTION:
+# Get correct includedir for best Boost version. Outputs the sole path
+# (without -I).
+boost-utils_get_includedir() {
+	local slot=$(boost-utils_get_best_slot)
+	has "${EAPI:-0}" 0 1 2 && ! use prefix && EPREFIX=
+
+	echo -n "${EPREFIX}/usr/include/boost-${slot/./_}"
+}
+
+_BOOST_ECLASS=1
+fi # _BOOST_ECLASS
-- 
1.7.12