media-libs/libsdl2: backport CMake config file fixes

Fixes build of consumers/reverse dependencies using CMake
to discover SDL2.

devilutionx failed like:
```
-- Configuring done
CMake Error at CMakeLists.txt:243 (target_link_libraries):
  Target "devilutionx" links to:

    SDL2::SDL2main

  but the target was not found.  Possible reasons include:

    * There is a typo in the target name.
    * A find_package call is missing for an IMPORTED target.
    * An ALIAS target is missing.
```

See https://forums.gentoo.org/viewtopic-p-8741497.html.

Signed-off-by: Sam James <sam@gentoo.org>

2 files changed, 373 insertions, 0 deletions

diff --git a/media-libs/libsdl2/files/libsdl2-2.24.0-cmake-target-fixes.patch b/media-libs/libsdl2/files/libsdl2-2.24.0-cmake-target-fixes.patch
new file mode 100644
index 000000000000..59353b98e06d
--- /dev/null
+++ b/media-libs/libsdl2/files/libsdl2-2.24.0-cmake-target-fixes.patch
@@ -0,0 +1,145 @@
+https://github.com/libsdl-org/SDL/commit/329794daf3f58088b56a64bdfa36b2021903be20
+https://github.com/libsdl-org/SDL/commit/62302d08f13ca5303135505c6b355afbbf069745
+
+From: Anonymous Maarten <anonymous.maarten@gmail.com>
+Date: Sun, 21 Aug 2022 04:03:32 +0200
+Subject: [PATCH] cmake: add library directories & pthread to imported targets
+ of sdl2-config.cmake
+
+This fixes linking to SDL2::SDL2-static on systems where external libraries such as X11 are not in a standard location.
+Pthread also needs special care.
+--- a/sdl2-config.cmake.in
++++ b/sdl2-config.cmake.in
+@@ -39,18 +39,25 @@ unset(bindir)
+ unset(libdir)
+ unset(includedir)
+ 
+-set(_sdl2_libraries "@SDL_LIBS@")
+-set(_sdl2_static_private_libs "@SDL_STATIC_LIBS@")
++set(_sdl2_libraries_in "@SDL_LIBS@")
++set(_sdl2_static_private_libs_in "@SDL_STATIC_LIBS@")
+ 
+-# Convert _sdl2_libraries to list and keep only libraries
+-string(REGEX MATCHALL "-[lm]([-a-zA-Z0-9._]+)" _sdl2_libraries "${_sdl2_libraries}")
++# Convert _sdl2_libraries to list and keep only libraries + library directories
++string(REGEX MATCHALL "-[lm]([-a-zA-Z0-9._]+)" _sdl2_libraries "${_sdl2_libraries_in}")
+ string(REGEX REPLACE "^-l" "" _sdl2_libraries "${_sdl2_libraries}")
+ string(REGEX REPLACE ";-l" ";" _sdl2_libraries "${_sdl2_libraries}")
++string(REGEX MATCHALL "-L([-a-zA-Z0-9._/]+)" _sdl2_libdirs "${_sdl2_libraries_in}")
++string(REGEX REPLACE "^-L" "" _sdl2_libdirs "${_sdl2_libdirs}")
++string(REGEX REPLACE ";-L" ";" _sdl2_libdirs "${_sdl2_libdirs}")
++list(APPEND _sdl2_libdirs "${SDL2_LIBDIR}")
+ 
+-# Convert _sdl2_static_private_libs to list and keep only libraries
+-string(REGEX MATCHALL "(-[lm]([-a-zA-Z0-9._]+))|(-Wl,[^ ]*framework[^ ]*)" _sdl2_static_private_libs "${_sdl2_static_private_libs}")
++# Convert _sdl2_static_private_libs to list and keep only libraries + library directories
++string(REGEX MATCHALL "(-[lm]([-a-zA-Z0-9._]+))|(-Wl,[^ ]*framework[^ ]*)|(-pthread)" _sdl2_static_private_libs "${_sdl2_static_private_libs_in}")
+ string(REGEX REPLACE "^-l" "" _sdl2_static_private_libs "${_sdl2_static_private_libs}")
+ string(REGEX REPLACE ";-l" ";" _sdl2_static_private_libs "${_sdl2_static_private_libs}")
++string(REGEX MATCHALL "-L([-a-zA-Z0-9._/]+)" _sdl2_static_private_libdirs "${_sdl2_static_private_libs_in}")
++string(REGEX REPLACE "^-L" "" _sdl2_static_private_libdirs "${_sdl2_static_private_libdirs}")
++string(REGEX REPLACE ";-L" ";" _sdl2_static_private_libdirs "${_sdl2_static_private_libdirs}")
+ 
+ if(_sdl2_libraries MATCHES ".*SDL2main.*")
+   list(INSERT SDL2_LIBRARIES 0 SDL2::SDL2main)
+@@ -103,6 +110,7 @@ if(WIN32)
+       set_target_properties(SDL2::SDL2 PROPERTIES
+         INTERFACE_INCLUDE_DIRECTORIES "${SDL2_INCLUDE_DIR}"
+         INTERFACE_LINK_LIBRARIES "${_sdl2_link_libraries}"
++        INTERFACE_LINK_DIRECTORIES "${_sdl2_libdirs}"
+         IMPORTED_LINK_INTERFACE_LANGUAGES "C"
+         IMPORTED_IMPLIB "${_sdl2_implib}"
+         IMPORTED_LOCATION "${_sdl2_dll}"
+@@ -122,6 +130,7 @@ else()
+       set_target_properties(SDL2::SDL2 PROPERTIES
+         INTERFACE_INCLUDE_DIRECTORIES "${SDL2_INCLUDE_DIR}"
+         INTERFACE_LINK_LIBRARIES "${_sdl2_link_libraries}"
++        INTERFACE_LINK_DIRECTORIES "${_sdl2_libdirs}"
+         IMPORTED_LINK_INTERFACE_LANGUAGES "C"
+         IMPORTED_LOCATION "${_sdl2_shared}"
+       )
+@@ -142,6 +151,7 @@ if(EXISTS "${_sdl2_static}")
+         IMPORTED_LOCATION "${_sdl2_static}"
+         INTERFACE_INCLUDE_DIRECTORIES "${SDL2_INCLUDE_DIR}"
+         INTERFACE_LINK_LIBRARIES "${_sdl2_link_libraries};${_sdl2_static_private_libs}"
++        INTERFACE_LINK_DIRECTORIES "${_sdl2_libdirs};${_sdl2_static_private_libdirs}"
+         IMPORTED_LINK_INTERFACE_LANGUAGES "C"
+     )
+   endif()
+
+From: Anonymous Maarten <anonymous.maarten@gmail.com>
+Date: Wed, 24 Aug 2022 04:14:52 +0200
+Subject: [PATCH] cmake: always create SDL2::SDL2main target in autotools'
+ cmake config script
+
+--- a/sdl2-config.cmake.in
++++ b/sdl2-config.cmake.in
+@@ -62,38 +62,39 @@ string(REGEX REPLACE ";-L" ";" _sdl2_static_private_libdirs "${_sdl2_static_priv
+ if(_sdl2_libraries MATCHES ".*SDL2main.*")
+   list(INSERT SDL2_LIBRARIES 0 SDL2::SDL2main)
+   list(INSERT SDL2_STATIC_LIBRARIES 0 SDL2::SDL2main)
+-  set(_sdl2main_library ${SDL2_LIBDIR}/${CMAKE_STATIC_LIBRARY_PREFIX}SDL2main${CMAKE_STATIC_LIBRARY_SUFFIX})
+-  if(EXISTS "${_sdl2main_library}")
+-    set(SDL2MAIN_LIBRARY SDL2::SDL2main)
+-    if(NOT TARGET SDL2::SDL2main)
+-      add_library(SDL2::SDL2main STATIC IMPORTED)
+-      set_target_properties(SDL2::SDL2main
+-        PROPERTIES
+-          IMPORTED_LOCATION "${_sdl2main_library}"
+-      )
+-      if(WIN32)
+-        # INTERFACE_LINK_OPTIONS needs CMake 3.13
+-        cmake_minimum_required(VERSION 3.13)
+-        # Mark WinMain/WinMain@16 as undefined, such that it will be withheld by the linker.
+-        if(CMAKE_SIZEOF_VOID_P EQUAL 4)
+-          set_target_properties(SDL2::SDL2main
+-            PROPERTIES
+-              INTERFACE_LINK_OPTIONS "-Wl,--undefined=_WinMain@16"
+-          )
+-        else()
+-          set_target_properties(SDL2::SDL2main
+-            PROPERTIES
+-              INTERFACE_LINK_OPTIONS "-Wl,--undefined=WinMain"
+-          )
+-        endif()
++endif()
++
++set(_sdl2main_library ${SDL2_LIBDIR}/${CMAKE_STATIC_LIBRARY_PREFIX}SDL2main${CMAKE_STATIC_LIBRARY_SUFFIX})
++if(EXISTS "${_sdl2main_library}")
++  set(SDL2MAIN_LIBRARY SDL2::SDL2main)
++  if(NOT TARGET SDL2::SDL2main)
++    add_library(SDL2::SDL2main STATIC IMPORTED)
++    set_target_properties(SDL2::SDL2main
++      PROPERTIES
++        IMPORTED_LOCATION "${_sdl2main_library}"
++    )
++    if(WIN32)
++      # INTERFACE_LINK_OPTIONS needs CMake 3.13
++      cmake_minimum_required(VERSION 3.13)
++      # Mark WinMain/WinMain@16 as undefined, such that it will be withheld by the linker.
++      if(CMAKE_SIZEOF_VOID_P EQUAL 4)
++        set_target_properties(SDL2::SDL2main
++          PROPERTIES
++            INTERFACE_LINK_OPTIONS "-Wl,--undefined=_WinMain@16"
++        )
++      else()
++        set_target_properties(SDL2::SDL2main
++          PROPERTIES
++            INTERFACE_LINK_OPTIONS "-Wl,--undefined=WinMain"
++        )
+       endif()
+     endif()
+-    set(SDL2_SDL2main_FOUND TRUE)
+-  else()
+-    set(SDL2_SDL2main_FOUND FALSE)
+   endif()
+-  unset(_sdl2main_library)
++  set(SDL2_SDL2main_FOUND TRUE)
++else()
++  set(SDL2_SDL2main_FOUND FALSE)
+ endif()
++unset(_sdl2main_library)
+ 
+ # Remove SDL2 since this is the "central" library
+ # Remove SDL2main since this will be provided by SDL2::SDL2main (if available)
+
diff --git a/media-libs/libsdl2/libsdl2-2.24.0-r1.ebuild b/media-libs/libsdl2/libsdl2-2.24.0-r1.ebuild
new file mode 100644
index 000000000000..6d4ad20ae903
--- /dev/null
+++ b/media-libs/libsdl2/libsdl2-2.24.0-r1.ebuild
@@ -0,0 +1,228 @@
+# Copyright 1999-2022 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+inherit autotools flag-o-matic multilib-minimal
+
+MY_P="SDL2-${PV}"
+DESCRIPTION="Simple Direct Media Layer"
+HOMEPAGE="https://www.libsdl.org/"
+SRC_URI="https://www.libsdl.org/release/${MY_P}.tar.gz"
+
+LICENSE="ZLIB"
+SLOT="0"
+KEYWORDS="~alpha ~amd64 ~arm ~arm64 ~hppa ~ia64 ~loong ~ppc ~ppc64 ~riscv ~sparc ~x86"
+
+IUSE="alsa aqua cpu_flags_ppc_altivec cpu_flags_x86_3dnow cpu_flags_x86_mmx cpu_flags_x86_sse cpu_flags_x86_sse2 custom-cflags dbus doc fcitx4 gles1 gles2 haptic ibus jack +joystick kms libsamplerate nas opengl oss pipewire pulseaudio sndio +sound static-libs +threads udev +video video_cards_vc4 vulkan wayland X xscreensaver"
+REQUIRED_USE="
+	alsa? ( sound )
+	fcitx4? ( dbus )
+	gles1? ( video )
+	gles2? ( video )
+	haptic? ( joystick )
+	ibus? ( dbus )
+	jack? ( sound )
+	nas? ( sound )
+	opengl? ( video )
+	pulseaudio? ( sound )
+	sndio? ( sound )
+	vulkan? ( video )
+	wayland? ( gles2 )
+	xscreensaver? ( X )"
+
+CDEPEND="
+	alsa? ( >=media-libs/alsa-lib-1.0.27.2[${MULTILIB_USEDEP}] )
+	dbus? ( >=sys-apps/dbus-1.6.18-r1[${MULTILIB_USEDEP}] )
+	fcitx4? ( app-i18n/fcitx:4 )
+	gles1? ( media-libs/mesa[${MULTILIB_USEDEP},gles1] )
+	gles2? ( >=media-libs/mesa-9.1.6[${MULTILIB_USEDEP},gles2] )
+	ibus? ( app-i18n/ibus )
+	jack? ( virtual/jack[${MULTILIB_USEDEP}] )
+	kms? (
+		>=x11-libs/libdrm-2.4.82[${MULTILIB_USEDEP}]
+		>=media-libs/mesa-9.0.0[${MULTILIB_USEDEP},gbm(+)]
+	)
+	libsamplerate? ( media-libs/libsamplerate[${MULTILIB_USEDEP}] )
+	nas? (
+		>=media-libs/nas-1.9.4[${MULTILIB_USEDEP}]
+		>=x11-libs/libXt-1.1.4[${MULTILIB_USEDEP}]
+	)
+	opengl? (
+		>=virtual/opengl-7.0-r1[${MULTILIB_USEDEP}]
+		>=virtual/glu-9.0-r1[${MULTILIB_USEDEP}]
+	)
+	pipewire? ( media-video/pipewire:=[${MULTILIB_USEDEP}] )
+	pulseaudio? ( >=media-sound/pulseaudio-2.1-r1[${MULTILIB_USEDEP}] )
+	sndio? ( media-sound/sndio:=[${MULTILIB_USEDEP}] )
+	udev? ( >=virtual/libudev-208:=[${MULTILIB_USEDEP}] )
+	wayland? (
+		>=dev-libs/wayland-1.20[${MULTILIB_USEDEP}]
+		>=media-libs/mesa-9.1.6[${MULTILIB_USEDEP},egl(+),gles2,wayland]
+		>=x11-libs/libxkbcommon-0.2.0[${MULTILIB_USEDEP}]
+	)
+	X? (
+		>=x11-libs/libX11-1.6.2[${MULTILIB_USEDEP}]
+		>=x11-libs/libXcursor-1.1.14[${MULTILIB_USEDEP}]
+		>=x11-libs/libXext-1.3.2[${MULTILIB_USEDEP}]
+		>=x11-libs/libXfixes-6.0.0[${MULTILIB_USEDEP}]
+		>=x11-libs/libXi-1.7.2[${MULTILIB_USEDEP}]
+		>=x11-libs/libXrandr-1.4.2[${MULTILIB_USEDEP}]
+		xscreensaver? ( >=x11-libs/libXScrnSaver-1.2.2-r1[${MULTILIB_USEDEP}] )
+	)"
+RDEPEND="${CDEPEND}
+	vulkan? ( media-libs/vulkan-loader )"
+DEPEND="${CDEPEND}
+	ibus? ( dev-libs/glib:2[${MULTILIB_USEDEP}] )
+	vulkan? ( dev-util/vulkan-headers )
+	X? ( x11-base/xorg-proto )
+"
+BDEPEND="
+	virtual/pkgconfig
+	doc? (
+		app-doc/doxygen
+		media-gfx/graphviz
+	)
+	wayland? ( >=dev-util/wayland-scanner-1.20 )
+"
+
+MULTILIB_WRAPPED_HEADERS=(
+	/usr/include/SDL2/SDL_config.h
+	/usr/include/SDL2/SDL_platform.h
+	/usr/include/SDL2/begin_code.h
+	/usr/include/SDL2/close_code.h
+)
+
+PATCHES=(
+	"${FILESDIR}"/${PN}-2.0.16-static-libs.patch
+	"${FILESDIR}"/${P}-cmake-target-fixes.patch
+)
+
+S="${WORKDIR}/${MY_P}"
+
+src_prepare() {
+	default
+
+	# Unbundle some headers.
+	rm -r src/video/khronos || die
+	ln -s "${ESYSROOT}/usr/include" src/video/khronos || die
+
+	# SDL seems to customize SDL_config.h.in to remove macros like
+	# PACKAGE_NAME. Add AT_NOEAUTOHEADER="yes" to prevent those macros from
+	# being reintroduced.
+	# https://bugs.gentoo.org/764959
+	AT_NOEAUTOHEADER="yes" AT_M4DIR="/usr/share/aclocal acinclude" \
+		eautoreconf
+}
+
+multilib_src_configure() {
+	use custom-cflags || strip-flags
+
+	if use ibus; then
+		local -x IBUS_CFLAGS="-I${ESYSROOT}/usr/include/ibus-1.0 -I${ESYSROOT}/usr/include/glib-2.0 -I${ESYSROOT}/usr/$(get_libdir)/glib-2.0/include"
+	fi
+
+	# sorted by `./configure --help`
+	local myeconfargs=(
+		$(use_enable static-libs static)
+		--enable-atomic
+		$(use_enable sound audio)
+		$(use_enable video)
+		--enable-render
+		--enable-events
+		$(use_enable joystick)
+		$(use_enable haptic)
+		--enable-power
+		--enable-filesystem
+		$(use_enable threads pthreads)
+		--enable-timers
+		--enable-file
+		--enable-loadso
+		--enable-cpuinfo
+		--enable-assembly
+		$(use_enable cpu_flags_ppc_altivec altivec)
+		$(use_enable cpu_flags_x86_sse ssemath)
+		$(use_enable cpu_flags_x86_mmx mmx)
+		$(use_enable cpu_flags_x86_3dnow 3dnow)
+		$(use_enable cpu_flags_x86_sse sse)
+		$(use_enable cpu_flags_x86_sse2 sse2)
+		$(use_enable oss)
+		$(use_enable alsa)
+		--disable-alsa-shared
+		$(use_enable jack)
+		--disable-jack-shared
+		--disable-esd
+		$(use_enable pipewire)
+		--disable-pipewire-shared
+		$(use_enable pulseaudio)
+		--disable-pulseaudio-shared
+		--disable-arts
+		$(use_enable libsamplerate)
+		$(use_enable nas)
+		--disable-nas-shared
+		$(use_enable sndio)
+		--disable-sndio-shared
+		$(use_enable sound diskaudio)
+		$(use_enable sound dummyaudio)
+		$(use_enable wayland video-wayland)
+		--disable-wayland-shared
+		$(use_enable video_cards_vc4 video-rpi)
+		$(use_enable X video-x11)
+		--disable-x11-shared
+		$(use_enable X video-x11-xcursor)
+		$(use_enable X video-x11-xdbe)
+		$(use_enable X video-x11-xfixes)
+		$(use_enable X video-x11-xinput)
+		$(use_enable X video-x11-xrandr)
+		$(use_enable xscreensaver video-x11-scrnsaver)
+		$(use_enable X video-x11-xshape)
+		$(use_enable aqua video-cocoa)
+		--disable-video-directfb
+		--disable-fusionsound
+		--disable-fusionsound-shared
+		$(use_enable kms video-kmsdrm)
+		--disable-kmsdrm-shared
+		$(use_enable video video-dummy)
+		$(use_enable opengl video-opengl)
+		$(use_enable gles1 video-opengles1)
+		$(use_enable gles2 video-opengles2)
+		$(use_enable vulkan video-vulkan)
+		$(use_enable udev libudev)
+		$(use_enable dbus)
+		$(use_enable fcitx4 fcitx)
+		$(use_enable ibus)
+		--disable-directx
+		--disable-rpath
+		--disable-render-d3d
+		$(use_with X x)
+	)
+
+	ECONF_SOURCE="${S}" \
+	econf "${myeconfargs[@]}"
+}
+
+multilib_src_compile() {
+	emake V=1
+}
+
+src_compile() {
+	multilib-minimal_src_compile
+
+	if use doc; then
+		cd docs || die
+		doxygen || die
+	fi
+}
+
+multilib_src_install() {
+	emake DESTDIR="${D}" install
+}
+
+multilib_src_install_all() {
+	# Do not delete the static .a libraries here as some are
+	# mandatory. They may be needed even when linking dynamically.
+	find "${ED}" -type f -name "*.la" -delete || die
+
+	dodoc {BUGS,CREDITS,README-SDL,TODO,WhatsNew}.txt README.md docs/README*.md
+	use doc && dodoc -r docs/output/html/
+}