Ports: Replace manually linking libpng with a libtool patch

Ports/libpng/package.sh

@@ -2,14 +2,8 @@
 port=libpng
 version=1.6.37
 useconfigure=true
+configopts=("--disable-static" "--enable-shared")
 use_fresh_config_sub=true
 files="https://download.sourceforge.net/libpng/libpng-${version}.tar.gz libpng-${version}.tar.gz daeb2620d829575513e35fecc83f0d3791a620b9b93d800b763542ece9390fb4"
 auth_type=sha256
 depends=("zlib")
-
-install() {
-    run make DESTDIR=${SERENITY_INSTALL_ROOT} "${installopts[@]}" install
-    ${CC} -shared -o ${SERENITY_INSTALL_ROOT}/usr/local/lib/libpng16.so -Wl,-soname,libpng16.so -Wl,--whole-archive ${SERENITY_INSTALL_ROOT}/usr/local/lib/libpng16.a -Wl,--no-whole-archive -lz
-    ln -sf libpng16.so ${SERENITY_INSTALL_ROOT}/usr/local/lib/libpng.so
-    rm -f ${SERENITY_INSTALL_ROOT}/usr/local/lib/libpng16.la ${SERENITY_INSTALL_ROOT}/usr/local/lib/libpng.la
-}

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

@@ -0,0 +1,76 @@
+From d556fcb6726b513794ab48818e453b8af848d2f1 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 1b2c463..ac2ad0b 100755
+--- a/configure
++++ b/configure
+@@ -5728,6 +5728,10 @@ tpf*)
+ os2*)
+   lt_cv_deplibs_check_method=pass_all
+   ;;
++
++serenity*)
++  lt_cv_deplibs_check_method=pass_all
++  ;;
+ esac
+ 
+ fi
+@@ -9172,6 +9176,10 @@ lt_prog_compiler_static=
+       lt_prog_compiler_static='-Bstatic'
+       ;;
+ 
++    serenity*)
++      lt_prog_compiler_can_build_shared=yes
++      ;;
++
+     *)
+       lt_prog_compiler_can_build_shared=no
+       ;;
+@@ -10690,6 +10698,10 @@ $as_echo "$lt_cv_irix_exported_symbol" >&6; }
+       hardcode_shlibpath_var=no
+       ;;
+ 
++    serenity*)
++      ld_shlibs=yes
++      ;;
++
+     *)
+       ld_shlibs=no
+       ;;
+@@ -11758,6 +11770,17 @@ 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/libpng/patches/ReadMe.md

@@ -0,0 +1,16 @@
+# Patches for libpng 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.
+