dev-libs/libsigc++: properly disable benchmarking

Also make boost dependency a multilib one

Upstream bug logged: https://bugzilla.gnome.org/show_bug.cgi?id=774732

Gentoo-Bug: 599764
Package-Manager: portage-2.3.2
Closes: https://github.com/gentoo/gentoo/pull/2842

Signed-off-by: Gilles Dartiguelongue <eva@gentoo.org>

dev-libs/libsigc++/files/libsigc++-2.10.0-make-disable-benchmarks-work.patch

@@ -0,0 +1,18 @@
+--- a/configure
++++ b/configure
+@@ -1480,6 +1480,7 @@
+   --enable-benchmark=yes|no
+ 
+ 
++
+ Optional Packages:
+   --with-PACKAGE[=ARG]    use PACKAGE [ARG=yes]
+   --without-PACKAGE       do not use PACKAGE (same as --with-PACKAGE=no)
+@@ -17799,8 +17800,7 @@
+ 
+ # Check whether --enable-benchmark was given.
+ if test "${enable_benchmark+set}" = set; then :
+-  enableval=$enable_benchmark; enable_benchmark=yes
+-
++  enableval=$enable_benchmark;
+ fi

dev-libs/libsigc++/libsigc++-2.10.0.ebuild

@@ -16,10 +16,13 @@ IUSE="doc static-libs test"
 RDEPEND=""
 DEPEND="sys-devel/m4
 	doc? ( app-doc/doxygen )
-	test? ( dev-libs/boost )"
+	test? ( dev-libs/boost[${MULTILIB_USEDEP}] )"
 # Needs mm-common for eautoreconf
 
 src_prepare() {
+	# properly interpret --{enable,disable}-benchmark configure option (bug 599764)
+	eapply "${FILESDIR}"/${P}-make-disable-benchmarks-work.patch
+
 	# don't waste time building examples
 	sed -i 's|^\(SUBDIRS =.*\)examples\(.*\)$|\1\2|' \
 		Makefile.am Makefile.in || die "sed examples failed"
@@ -51,8 +54,5 @@ multilib_src_install_all() {
 
 	# Note: html docs are installed into /usr/share/doc/libsigc++-2.0
 	# We can't use /usr/share/doc/${PF} because of links from glibmm etc. docs
-	if use doc ; then
-		insinto /usr/share/doc/${PF}
-		doins -r examples
-	fi
+	use doc && dodoc -r examples
 }