media-libs/taglib: introduce boost USE flag

Boost may optionally be used instead of GCC built-ins.

Although only used at build time for header-only functions, an ABI-specific
version of boost is required as the build system calls target_link_libraries.

Package-Manager: portage-2.3.0

media-libs/taglib/metadata.xml

@@ -7,6 +7,7 @@
 	</maintainer>
 	<use>
 		<flag name="asf">Provide support for Microsoft's 'advanced systems format' media container.</flag>
+		<flag name="boost">Use <pkg>dev-libs/boost</pkg> instead of GCC built-ins</flag>
 	</use>
 	<upstream>
 		<remote-id type="github">taglib/taglib</remote-id>

media-libs/taglib/taglib-1.11.ebuild → media-libs/taglib/taglib-1.11-r1.ebuild

@@ -13,11 +13,12 @@ SRC_URI="https://github.com/${PN}/${PN}/archive/v${PV}.tar.gz -> ${P}.tar.gz"
 LICENSE="LGPL-2.1 MPL-1.1"
 KEYWORDS="~alpha ~amd64 ~arm ~arm64 ~hppa ~ia64 ~mips ~ppc ~ppc64 ~sh ~sparc ~x86 ~amd64-fbsd ~x86-fbsd ~x86-freebsd ~x86-interix ~amd64-linux ~x86-linux ~ppc-macos ~x86-solaris"
 SLOT="0"
-IUSE="debug examples test"
+IUSE="boost debug examples test"
 
 RDEPEND=">=sys-libs/zlib-1.2.8-r1[${MULTILIB_USEDEP}]"
 DEPEND="${RDEPEND}
 	>=virtual/pkgconfig-0-r1[${MULTILIB_USEDEP}]
+	boost? ( dev-libs/boost[${MULTILIB_USEDEP}] )
 	test? ( >=dev-util/cppunit-1.13.2[${MULTILIB_USEDEP}] )
 "
 
@@ -42,6 +43,7 @@ src_prepare() {
 multilib_src_configure() {
 	local mycmakeargs=(
 		$(multilib_is_native_abi && echo -DBUILD_EXAMPLES=$(usex examples))
+		$(cmake-utils_use_find_package boost Boost)
 		-DBUILD_SHARED_LIBS=ON
 		-DBUILD_TESTS=$(usex test)
 	)