Ports: Add a port of SDL_mixer

Ports/AvailablePorts.md

@@ -199,6 +199,7 @@ This list is also available at [ports.serenityos.net](https://ports.serenityos.n
 | [`ruby`](ruby/)                                     | Ruby                                                            | 3.0.4                    | https://www.ruby-lang.org/                                                     |
 | [`sam`](sam/)                                       | Software Automatic Mouth (SAM)                                  | c86ea39                  | https://github.com/vidarh/SAM                                                  |
 | [`scummvm`](scummvm/)                               | ScummVM                                                         | 2.5.1                    | https://www.scummvm.org/                                                       |
+| [`SDL_mixer`](SDL_mixer/)                           | SDL\_mixer (Audio mixer add-on for SDL 1.2)                     | 1.2.12                   | https://www.libsdl.org/projects/SDL_mixer/release-1.2.html                     |
 | [`SDL_sound`](SDL_sound/)                           | SDL_sound (Abstract soundfile decoder)                          |                          | https://github.com/icculus/SDL_sound                                           |
 | [`sdl12-compat`](sdl12-compat/)                     | SDL2 compatibility layer for SDL 1.2 games                      | 1.2.52                   | https://github.com/libsdl-org/sdl12-compat/                                    |
 | [`SDL2`](SDL2/)                                     | Simple DirectMedia Layer (SDL2)                                 | 2.0.22                   | https://github.com/libsdl-org/SDL                                              |

Ports/SDL_mixer/package.sh

@@ -0,0 +1,10 @@
+#!/usr/bin/env -S bash ../.port_include.sh
+port=SDL_mixer
+version=1.2.12
+useconfigure=true
+configopts=("--disable-static")
+use_fresh_config_sub=true
+config_sub_paths=("build-scripts/config.sub")
+files="https://www.libsdl.org/projects/SDL_mixer/release/SDL_mixer-${version}.tar.gz SDL_mixer-${version}.tar.gz 1644308279a975799049e4826af2cfc787cad2abb11aa14562e402521f86992a"
+auth_type=sha256
+depends=("libmikmod" "libvorbis" "sdl12-compat")

Ports/SDL_mixer/patches/0001-libtool-Enable-shared-library-support-for-SerenityOS.patch

@@ -0,0 +1,76 @@
+From bdb6569ba8bcc1332ee220b3128e94c8c69d47f7 Mon Sep 17 00:00:00 2001
+From: Tim Schumacher <timschumi@gmx.de>
+Date: Sun, 29 May 2022 15:01:28 +0200
+Subject: [PATCH] libtool: Enable shared library support for SerenityOS
+
+For some odd reason, libtool handles the configuration for shared
+libraries entirely statically and in its configure script. If no
+shared library support is "present", building shared libraries is
+disabled entirely.
+
+Fix that by just adding the appropriate configuration options for
+`serenity`. This allows us to finally create dynamic libraries
+automatically using libtool, without having to manually link the
+static library into a shared library.
+---
+ configure | 23 +++++++++++++++++++++++
+ 1 file changed, 23 insertions(+)
+
+diff --git a/configure b/configure
+index e7c8c97..37ef6b5 100755
+--- a/configure
++++ b/configure
+@@ -4244,6 +4244,10 @@ sysv4 | sysv4.3*)
+ tpf*)
+   lt_cv_deplibs_check_method=pass_all
+   ;;
++
++serenity*)
++  lt_cv_deplibs_check_method=pass_all
++  ;;
+ esac
+ 
+ fi
+@@ -7375,6 +7379,10 @@ echo $ECHO_N "checking for $compiler option to produce PIC... $ECHO_C" >&6; }
+       lt_prog_compiler_static='-Bstatic'
+       ;;
+ 
++    serenity*)
++      lt_prog_compiler_can_build_shared=yes
++      ;;
++
+     *)
+       lt_prog_compiler_can_build_shared=no
+       ;;
+@@ -8687,6 +8695,10 @@ rm -f core conftest.err conftest.$ac_objext conftest_ipa8_conftest.oo \
+       hardcode_shlibpath_var=no
+       ;;
+ 
++    serenity*)
++      ld_shlibs=yes
++      ;;
++
+     *)
+       ld_shlibs=no
+       ;;
+@@ -9617,6 +9629,17 @@ uts4*)
+   shlibpath_var=LD_LIBRARY_PATH
+   ;;
+ 
++serenity*)
++  version_type=linux
++  need_lib_prefix=no
++  need_version=no
++  library_names_spec='${libname}${release}${shared_ext}${versuffix} ${libname}${release}${shared_ext}${major} ${libname}${shared_ext}'
++  soname_spec='${libname}${release}${shared_ext}${major}'
++  shlibpath_var=LD_LIBRARY_PATH
++  shlibpath_overrides_runpath=no
++  dynamic_linker='SerenityOS LibELF'
++  ;;
++
+ *)
+   dynamic_linker=no
+   ;;
+-- 
+2.36.1
+

Ports/SDL_mixer/patches/ReadMe.md

@@ -0,0 +1,16 @@
+# Patches for SDL_mixer on SerenityOS
+
+## `0001-libtool-Enable-shared-library-support-for-SerenityOS.patch`
+
+libtool: Enable shared library support for SerenityOS
+
+For some odd reason, libtool handles the configuration for shared
+libraries entirely statically and in its configure script. If no
+shared library support is "present", building shared libraries is
+disabled entirely.
+
+Fix that by just adding the appropriate configuration options for
+`serenity`. This allows us to finally create dynamic libraries
+automatically using libtool, without having to manually link the
+static library into a shared library.
+