gnome-base/librsvg: backport -Wl,--gc-sections usage

```
 *   SIZE: 36.28MiB -> 18.79MiB, 22 -> 22 files
 * ------> ABI(nodebug) SIZE(-48.21%)
```

Bug: https://gitlab.gnome.org/GNOME/librsvg/-/issues/965
Signed-off-by: Sam James <sam@gentoo.org>

2 files changed, 472 insertions, 0 deletions

diff --git a/gnome-base/librsvg/files/librsvg-2.56.0-gc-sections-shrink.patch b/gnome-base/librsvg/files/librsvg-2.56.0-gc-sections-shrink.patch
new file mode 100644
index 000000000000..d20909f4eaa5
--- /dev/null
+++ b/gnome-base/librsvg/files/librsvg-2.56.0-gc-sections-shrink.patch
@@ -0,0 +1,53 @@
+https://gitlab.gnome.org/GNOME/librsvg/-/issues/965
+https://gitlab.gnome.org/GNOME/librsvg/-/merge_requests/832
+https://github.com/rust-lang/rust/issues/111593
+
+From 61bba147f65019eab2a42148065798bc568169ab Mon Sep 17 00:00:00 2001
+From: Federico Mena Quintero <federico@gnome.org>
+Date: Thu, 18 May 2023 17:57:01 -0600
+Subject: [PATCH] (#965): Shrink the shared library by telling the linker to
+ omit unused code
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+Thanks to Sebastian Dröge for spotting this.
+
+Fixes https://gitlab.gnome.org/GNOME/librsvg/-/issues/965
+
+Part-of: <https://gitlab.gnome.org/GNOME/librsvg/-/merge_requests/832>
+--- a/Makefile.am
++++ b/Makefile.am
+@@ -217,12 +217,24 @@ librsvg_@RSVG_API_MAJOR_VERSION@_la_CPPFLAGS = $(AM_CPPFLAGS)
+ 
+ librsvg_@RSVG_API_MAJOR_VERSION@_la_CFLAGS = $(AM_CFLAGS)
+ 
+-librsvg_@RSVG_API_MAJOR_VERSION@_la_LDFLAGS = \
+-	$(BSYMBOLIC_LDFLAG) \
+-	-version-info @RSVG_LT_VERSION_INFO@ \
+-	-export-dynamic \
+-	-no-undefined \
+-	-export-symbols-regex "^rsvg_.*" \
++# This is not strictly needed, but since we are telling Cargo to build a staticlib, it puts in
++# all of Rust's standard library and code from dependencies even when it is not needed.
++# With the following, we shrink the final .so size; see issue #965.
++#
++# This will no longer be needed when we switch to cargo-cbuild, which does this automatically.
++if OS_DARWIN
++gc_linked_library_args="-Wl,-dead_strip"
++else
++gc_linked_library_args="-Wl,--gc-sections"
++endif
++
++librsvg_@RSVG_API_MAJOR_VERSION@_la_LDFLAGS =	\
++	$(BSYMBOLIC_LDFLAG)			\
++	-version-info @RSVG_LT_VERSION_INFO@	\
++	-export-dynamic				\
++	-no-undefined				\
++	-export-symbols-regex "^rsvg_.*"	\
++	$(gc_linked_library_args)		\
+ 	$(AM_LDFLAGS)
+ 
+ if OS_DARWIN
+-- 
+GitLab
diff --git a/gnome-base/librsvg/librsvg-2.56.0-r1.ebuild b/gnome-base/librsvg/librsvg-2.56.0-r1.ebuild
new file mode 100644
index 000000000000..b4089d7d636c
--- /dev/null
+++ b/gnome-base/librsvg/librsvg-2.56.0-r1.ebuild
@@ -0,0 +1,419 @@
+# Copyright 1999-2023 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+PYTHON_COMPAT=( python3_{10..11} )
+GNOME2_EAUTORECONF=yes
+CRATES="
+	adler-1.0.2
+	aho-corasick-0.7.20
+	android_system_properties-0.1.5
+	anes-0.1.6
+	anstyle-0.3.4
+	anyhow-1.0.69
+	approx-0.5.1
+	assert_cmd-2.0.10
+	atty-0.2.14
+	autocfg-1.1.0
+	base-x-0.2.11
+	bit-set-0.5.3
+	bit-vec-0.6.3
+	bitflags-1.3.2
+	block-0.1.6
+	bstr-1.3.0
+	bumpalo-3.12.0
+	bytemuck-1.13.1
+	byteorder-1.4.3
+	cc-1.0.79
+	cairo-rs-0.17.0
+	cairo-sys-rs-0.17.0
+	cast-0.3.0
+	cfg-expr-0.11.0
+	cfg-if-1.0.0
+	chrono-0.4.23
+	chrono-0.4.24
+	ciborium-0.2.0
+	ciborium-io-0.2.0
+	ciborium-ll-0.2.0
+	clap-2.34.0
+	clap-3.2.23
+	clap-4.1.9
+	clap_complete-4.1.5
+	clap_derive-4.1.9
+	clap_lex-0.2.4
+	clap_lex-0.3.3
+	codespan-reporting-0.11.1
+	const-cstr-0.3.0
+	const_fn-0.4.9
+	convert_case-0.4.0
+	core-foundation-sys-0.8.3
+	crc32fast-1.3.2
+	criterion-0.4.0
+	criterion-plot-0.5.0
+	crossbeam-channel-0.5.7
+	crossbeam-deque-0.8.3
+	crossbeam-epoch-0.9.14
+	crossbeam-utils-0.8.15
+	cssparser-0.29.6
+	cssparser-macros-0.6.0
+	cxx-1.0.92
+	cxx-build-1.0.92
+	cxxbridge-flags-1.0.92
+	cxxbridge-macro-1.0.92
+	data-url-0.2.0
+	derive_more-0.99.17
+	difflib-0.4.0
+	discard-1.0.4
+	dlib-0.5.0
+	doc-comment-0.3.3
+	dtoa-0.4.8
+	dtoa-short-0.3.3
+	either-1.8.1
+	encoding-0.2.33
+	encoding-index-japanese-1.20141219.5
+	encoding-index-korean-1.20141219.5
+	encoding-index-simpchinese-1.20141219.5
+	encoding-index-singlebyte-1.20141219.5
+	encoding-index-tradchinese-1.20141219.5
+	encoding_index_tests-0.1.4
+	errno-0.2.8
+	errno-dragonfly-0.1.2
+	fastrand-1.9.0
+	flate2-1.0.25
+	float-cmp-0.9.0
+	fnv-1.0.7
+	form_urlencoded-1.1.0
+	futf-0.1.5
+	futures-channel-0.3.27
+	futures-core-0.3.27
+	futures-executor-0.3.27
+	futures-io-0.3.27
+	futures-macro-0.3.27
+	futures-task-0.3.27
+	futures-util-0.3.27
+	fxhash-0.2.1
+	gdk-pixbuf-0.17.0
+	gdk-pixbuf-sys-0.17.0
+	getrandom-0.1.16
+	getrandom-0.2.8
+	gio-0.17.4
+	gio-sys-0.17.4
+	glib-0.17.5
+	glib-macros-0.17.5
+	glib-sys-0.17.4
+	gobject-sys-0.17.4
+	half-1.8.2
+	hashbrown-0.12.3
+	heck-0.4.1
+	hermit-abi-0.1.19
+	hermit-abi-0.2.6
+	hermit-abi-0.3.1
+	iana-time-zone-0.1.53
+	iana-time-zone-haiku-0.1.1
+	idna-0.3.0
+	indexmap-1.9.2
+	instant-0.1.12
+	io-lifetimes-1.0.7
+	is-terminal-0.4.4
+	itertools-0.10.5
+	itoa-1.0.6
+	js-sys-0.3.61
+	language-tags-0.3.2
+	lazy_static-1.4.0
+	libc-0.2.140
+	libloading-0.7.4
+	libm-0.2.6
+	link-cplusplus-1.0.8
+	linked-hash-map-0.5.6
+	linux-raw-sys-0.1.4
+	locale_config-0.3.0
+	lock_api-0.4.9
+	log-0.4.17
+	lopdf-0.29.0
+	mac-0.1.1
+	malloc_buf-0.0.6
+	markup5ever-0.10.1
+	markup5ever-0.11.0
+	matches-0.1.10
+	matrixmultiply-0.3.2
+	memchr-2.5.0
+	memoffset-0.8.0
+	miniz_oxide-0.6.2
+	nalgebra-0.32.2
+	nalgebra-macros-0.2.0
+	new_debug_unreachable-1.0.4
+	nodrop-0.1.14
+	normalize-line-endings-0.3.0
+	num-complex-0.4.3
+	num-integer-0.1.45
+	num-rational-0.4.1
+	num-traits-0.2.15
+	num_cpus-1.15.0
+	objc-0.2.7
+	objc-foundation-0.1.1
+	objc_id-0.1.1
+	once_cell-1.17.1
+	oorandom-11.1.3
+	os_str_bytes-6.4.1
+	pango-0.17.4
+	pango-sys-0.17.0
+	pangocairo-0.17.0
+	pangocairo-sys-0.17.3
+	parking_lot-0.12.1
+	parking_lot_core-0.9.7
+	paste-1.0.12
+	percent-encoding-2.2.0
+	phf-0.8.0
+	phf-0.10.1
+	phf_codegen-0.8.0
+	phf_codegen-0.10.0
+	phf_generator-0.8.0
+	phf_generator-0.10.0
+	phf_macros-0.10.0
+	phf_shared-0.8.0
+	phf_shared-0.10.0
+	pin-project-lite-0.2.9
+	pin-utils-0.1.0
+	pkg-config-0.3.26
+	plotters-0.3.4
+	plotters-backend-0.3.4
+	plotters-svg-0.3.3
+	png-0.17.7
+	pom-3.2.0
+	ppv-lite86-0.2.17
+	precomputed-hash-0.1.1
+	predicates-2.1.5
+	predicates-3.0.1
+	predicates-core-1.0.6
+	predicates-tree-1.0.9
+	proc-macro-crate-1.3.1
+	proc-macro-error-1.0.4
+	proc-macro-error-attr-1.0.4
+	proc-macro-hack-0.5.20+deprecated
+	proc-macro2-0.4.30
+	proc-macro2-1.0.52
+	proptest-1.1.0
+	quick-error-1.2.3
+	quick-error-2.0.1
+	quote-1.0.26
+	rand-0.7.3
+	rand-0.8.5
+	rand_chacha-0.2.2
+	rand_chacha-0.3.1
+	rand_core-0.5.1
+	rand_core-0.6.4
+	rand_hc-0.2.0
+	rand_pcg-0.2.1
+	rand_xorshift-0.3.0
+	rawpointer-0.2.1
+	rayon-1.7.0
+	rayon-core-1.11.0
+	rctree-0.5.0
+	redox_syscall-0.2.16
+	regex-1.7.1
+	regex-automata-0.1.10
+	regex-syntax-0.6.28
+	remove_dir_all-0.5.3
+	rgb-0.8.36
+	rustc_version-0.2.3
+	rustc_version-0.4.0
+	rusty-fork-0.3.0
+	rustix-0.36.9
+	ryu-1.0.13
+	safe_arch-0.6.0
+	same-file-1.0.6
+	scratch-1.0.5
+	scopeguard-1.1.0
+	selectors-0.24.0
+	semver-0.9.0
+	semver-1.0.17
+	semver-parser-0.7.0
+	serde-1.0.156
+	serde_derive-1.0.156
+	serde_json-1.0.94
+	servo_arc-0.2.0
+	sha1-0.6.1
+	sha1_smol-1.0.0
+	simba-0.8.0
+	siphasher-0.3.10
+	slab-0.4.8
+	smallvec-1.10.0
+	stable_deref_trait-1.2.0
+	standback-0.2.17
+	stdweb-0.4.20
+	stdweb-derive-0.5.3
+	stdweb-internal-macros-0.2.9
+	stdweb-internal-runtime-0.1.5
+	string_cache-0.8.7
+	string_cache_codegen-0.5.2
+	strsim-0.10.0
+	syn-1.0.109
+	system-deps-6.0.3
+	tempfile-3.4.0
+	tendril-0.4.3
+	termcolor-1.2.0
+	termtree-0.4.1
+	textwrap-0.16.0
+	thiserror-1.0.39
+	thiserror-impl-1.0.39
+	time-0.1.44
+	time-0.2.27
+	time-macros-0.1.1
+	time-macros-impl-0.1.2
+	tinytemplate-1.2.1
+	tinyvec-1.6.0
+	tinyvec_macros-0.1.1
+	toml-0.5.11
+	toml_edit-0.19.7
+	toml_datetime-0.6.1
+	typenum-1.16.0
+	unarray-0.1.4
+	unicode-bidi-0.3.11
+	unicode-ident-1.0.8
+	unicode-normalization-0.1.22
+	unicode-width-0.1.10
+	url-2.3.1
+	utf-8-0.7.6
+	version-compare-0.1.1
+	version_check-0.9.4
+	wait-timeout-0.2.0
+	walkdir-2.3.3
+	wasi-0.9.0+wasi-snapshot-preview1
+	wasi-0.11.0+wasi-snapshot-preview1
+	wasm-bindgen-0.2.84
+	wasm-bindgen-backend-0.2.84
+	wasm-bindgen-macro-0.2.84
+	wasm-bindgen-macro-support-0.2.84
+	wasm-bindgen-shared-0.2.84
+	web-sys-0.3.61
+	weezl-0.1.7
+	wide-0.7.8
+	winapi-0.3.9
+	winapi-i686-pc-windows-gnu-0.4.0
+	winapi-util-0.1.5
+	winapi-x86_64-pc-windows-gnu-0.4.0
+	windows-sys-0.42.0
+	windows-sys-0.45.0
+	windows-targets-0.42.2
+	windows_aarch64_gnullvm-0.42.2
+	windows_aarch64_msvc-0.42.2
+	windows_i686_gnu-0.42.2
+	windows_i686_msvc-0.42.2
+	windows_x86_64_gnu-0.42.2
+	windows_x86_64_gnullvm-0.42.2
+	windows_x86_64_msvc-0.42.2
+	winnow-0.3.6
+	xml5ever-0.17.0
+	yeslogic-fontconfig-sys-4.0.1
+"
+
+inherit cargo gnome2 multilib-minimal python-any-r1 rust-toolchain vala
+
+DESCRIPTION="Scalable Vector Graphics (SVG) rendering library"
+HOMEPAGE="https://wiki.gnome.org/Projects/LibRsvg https://gitlab.gnome.org/GNOME/librsvg"
+SRC_URI+=" $(cargo_crate_uris ${CRATES})"
+
+LICENSE="Apache-2.0 BSD CC0-1.0 LGPL-2.1+ MIT MPL-2.0 Unicode-DFS-2016"
+
+SLOT="2"
+KEYWORDS="~amd64 ~arm ~arm64 ~ppc ~ppc64 ~riscv ~sparc ~x86"
+
+IUSE="gtk-doc +introspection +vala"
+REQUIRED_USE="
+	gtk-doc? ( introspection )
+	vala? ( introspection )
+"
+RESTRICT="test" # Lots of issues on 32bit builds, 64bit build seems to get into an infinite compilation sometimes, etc.
+
+RDEPEND="
+	>=x11-libs/cairo-1.16.0[glib,svg(+),${MULTILIB_USEDEP}]
+	>=media-libs/freetype-2.9:2[${MULTILIB_USEDEP}]
+	>=x11-libs/gdk-pixbuf-2.20:2[introspection?,${MULTILIB_USEDEP}]
+	>=dev-libs/glib-2.50.0:2[${MULTILIB_USEDEP}]
+	>=media-libs/harfbuzz-2.0.0:=[${MULTILIB_USEDEP}]
+	>=dev-libs/libxml2-2.9.1-r4:2[${MULTILIB_USEDEP}]
+	>=x11-libs/pango-1.48.11[${MULTILIB_USEDEP}]
+
+	introspection? ( >=dev-libs/gobject-introspection-0.10.8:= )
+"
+DEPEND="${RDEPEND}"
+BDEPEND="
+	>=virtual/rust-1.64.0[${MULTILIB_USEDEP}]
+	x11-libs/gdk-pixbuf
+	${PYTHON_DEPS}
+	$(python_gen_any_dep 'dev-python/docutils[${PYTHON_USEDEP}]')
+	gtk-doc? ( dev-util/gi-docgen )
+	virtual/pkgconfig
+	vala? ( $(vala_depend) )
+
+	dev-libs/gobject-introspection-common
+	dev-libs/vala-common
+"
+# dev-libs/gobject-introspection-common, dev-libs/vala-common needed by eautoreconf
+
+QA_FLAGS_IGNORED="
+	usr/bin/rsvg-convert
+	usr/lib.*/librsvg.*
+"
+
+PATCHES=(
+	"${FILESDIR}"/${PN}-2.56.0-gc-sections-shrink.patch
+)
+
+src_prepare() {
+	use vala && vala_setup
+	gnome2_src_prepare
+}
+
+multilib_src_configure() {
+	local myconf=(
+		--disable-static
+		--disable-debug
+		$(multilib_native_use_enable gtk-doc)
+		$(multilib_native_use_enable introspection)
+		$(multilib_native_use_enable vala)
+		--enable-pixbuf-loader
+	)
+
+	if ! multilib_is_native_abi; then
+		myconf+=(
+			# Set the rust target, which can differ from CHOST
+			RUST_TARGET="$(rust_abi)"
+			# RUST_TARGET is only honored if cross_compiling, but non-native ABIs aren't cross as
+			# far as C parts and configure auto-detection are concerned as CHOST equals CBUILD
+			cross_compiling=yes
+		)
+	fi
+
+	ECONF_SOURCE=${S} \
+	gnome2_src_configure "${myconf[@]}"
+
+	if multilib_is_native_abi; then
+		ln -s "${S}"/doc/html doc/html || die
+	fi
+}
+
+multilib_src_compile() {
+	gnome2_src_compile
+}
+
+multilib_src_install() {
+	gnome2_src_install
+}
+
+multilib_src_install_all() {
+	find "${ED}" -name '*.la' -delete || die
+
+	if use gtk-doc; then
+		mkdir -p "${ED}"/usr/share/gtk-doc/html/ || die
+		mv "${ED}"/usr/share/doc/Rsvg-2.0 "${ED}"/usr/share/gtk-doc/html/ || die
+	fi
+}
+
+pkg_postinst() {
+	multilib_foreach_abi gnome2_pkg_postinst
+}
+
+pkg_postrm() {
+	multilib_foreach_abi gnome2_pkg_postrm
+}