depends: Split libpng out of Qt

Github-Pull: bitcoin#14066
Rebased-From: 2a50974

depends/packages/libpng.mk

@@ -0,0 +1,23 @@
+package=libpng
+$(package)_version=1.6.34
+$(package)_download_path=http://ftp.osuosl.org/pub/libpng/src/libpng16/
+$(package)_file_name=$(package)-$($(package)_version).tar.gz
+$(package)_sha256_hash=574623a4901a9969080ab4a2df9437026c8a87150dfd5c235e28c94b212964a7
+$(package)_dependencies=zlib
+
+define $(package)_set_vars
+  $(package)_config_opts=--enable-static --disable-shared
+endef
+
+define $(package)_config_cmds
+  $($(package)_autoconf)
+endef
+
+define $(package)_build_cmds
+  $(MAKE) $($(package)_build_opts) PNG_COPTS='-fPIC'
+endef
+
+define $(package)_stage_cmds
+  $(MAKE) DESTDIR=$($(package)_staging_dir) install $($(package)_build_opts)
+endef
+

depends/packages/packages.mk

@@ -1,7 +1,7 @@
 packages:=boost openssl libevent zeromq
 
 qt_native_packages = native_protobuf
-qt_packages = qrencode protobuf zlib
+qt_packages = libpng qrencode protobuf zlib
 
 qt_linux_packages:=qt expat dbus libxcb xcb_proto libXau xproto freetype fontconfig libX11 xextproto libXext xtrans
 

depends/packages/qt.mk

@@ -4,7 +4,7 @@ $(package)_download_path=https://download.qt.io/official_releases/qt/5.9/$($(pac
 $(package)_suffix=opensource-src-$($(package)_version).tar.xz
 $(package)_file_name=qtbase-$($(package)_suffix)
 $(package)_sha256_hash=eed620cb268b199bd83b3fc6a471c51d51e1dc2dbb5374fc97a0cc75facbe36f
-$(package)_dependencies=openssl zlib
+$(package)_dependencies=libpng openssl zlib
 $(package)_linux_dependencies=freetype fontconfig libxcb libX11 xproto libXext
 $(package)_build_subdir=qtbase
 $(package)_qt_libs=corelib network widgets gui plugins testlib
@@ -61,7 +61,7 @@ $(package)_config_opts += -optimized-qmake
 $(package)_config_opts += -pch
 $(package)_config_opts += -pkg-config
 $(package)_config_opts += -prefix $(host_prefix)
-$(package)_config_opts += -qt-libpng
+$(package)_config_opts += -system-libpng
 $(package)_config_opts += -qt-libjpeg
 $(package)_config_opts += -qt-pcre
 $(package)_config_opts += -system-zlib

doc/dependencies.md

@@ -16,7 +16,7 @@ These are the dependencies currently used by Bitcoin Core. You can find instruct
 | HarfBuzz-NG |  |  |  |  |  |
 | libevent | [2.1.8-stable](https://github.com/libevent/libevent/releases) | 2.0.22 | No |  |  |
 | libjpeg |  |  |  |  | [Yes](https://github.com/bitcoin/bitcoin/blob/master/depends/packages/qt.mk#L65) |
-| libpng |  |  |  |  | [Yes](https://github.com/bitcoin/bitcoin/blob/master/depends/packages/qt.mk#L64) |
+| libpng |  |  |  |  | No |
 | MiniUPnPc | [2.0.20180203](http://miniupnp.free.fr/files) |  | No |  |  |
 | OpenSSL | [1.0.1k](https://www.openssl.org/source) |  | Yes |  |  |
 | PCRE |  |  |  |  | [Yes](https://github.com/bitcoin/bitcoin/blob/master/depends/packages/qt.mk#L66) |