zlib: switch to a virtual package

The existing zlib package is renamed to libzlib, and zlib is turned
into a virtual package. This is done in preparation to the
introduction of zlib-ng as an alternative implementation.

Signed-off-by: Stefan Fröberg <stefan.froberg@petroprogram.com>
[Thomas: define BR2_PACKAGE_PROVIDES_HOST_ZLIB as suggested by Yann
E. Morin.]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

3 files changed, 32 insertions, 75 deletions

diff --git a/package/zlib/Config.in b/package/zlib/Config.in
index 6201aba142..bdc1da6056 100644
--- a/package/zlib/Config.in
+++ b/package/zlib/Config.in
@@ -1,7 +1,37 @@
 config BR2_PACKAGE_ZLIB
+	bool "zlib support"
+	help
+	  Select the desired Zlib library provider.
+
+if BR2_PACKAGE_ZLIB
+
+choice
+	prompt "zlib variant"
+	default BR2_PACKAGE_LIBZLIB
+	help
+	  Select the desired Zlib library provider.
+
+config BR2_PACKAGE_LIBZLIB
 	bool "zlib"
+	select BR2_PACKAGE_HAS_ZLIB
 	help
 	  Standard (de)compression library. Used by things like
 	  gzip and libpng.
 
 	  http://www.zlib.net
+
+endchoice
+
+config BR2_PACKAGE_HAS_ZLIB
+	bool
+
+config BR2_PACKAGE_PROVIDES_ZLIB
+	string
+	default "libzlib" if BR2_PACKAGE_LIBZLIB
+
+endif
+
+# ensure libzlib is used for the host variant
+config BR2_PACKAGE_PROVIDES_HOST_ZLIB
+	string
+	default "host-libzlib"
diff --git a/package/zlib/zlib.hash b/package/zlib/zlib.hash
deleted file mode 100644
index e3736b1011..0000000000
--- a/package/zlib/zlib.hash
+++ /dev/null
@@ -1,4 +0,0 @@
-# From http://www.zlib.net/
-sha256 4ff941449631ace0d4d203e3483be9dbc9da454084111f97ea0a2114e19bf066  zlib-1.2.11.tar.xz
-# License files, locally calculated
-sha256 7960b6b1cc63e619abb77acaea5427159605afee8c8b362664f4effc7d7f7d15  README
diff --git a/package/zlib/zlib.mk b/package/zlib/zlib.mk
index 9b5f52e807..78f48ff059 100644
--- a/package/zlib/zlib.mk
+++ b/package/zlib/zlib.mk
@@ -4,74 +4,5 @@
 #
 ################################################################################
 
-ZLIB_VERSION = 1.2.11
-ZLIB_SOURCE = zlib-$(ZLIB_VERSION).tar.xz
-ZLIB_SITE = http://www.zlib.net
-ZLIB_LICENSE = Zlib
-ZLIB_LICENSE_FILES = README
-ZLIB_INSTALL_STAGING = YES
-
-# It is not possible to build only a shared version of zlib, so we build both
-# shared and static, unless we only want the static libs, and we eventually
-# selectively remove what we do not want
-ifeq ($(BR2_STATIC_LIBS),y)
-ZLIB_PIC =
-ZLIB_SHARED = --static
-else
-ZLIB_PIC = -fPIC
-ZLIB_SHARED = --shared
-endif
-
-define ZLIB_CONFIGURE_CMDS
-	(cd $(@D); rm -rf config.cache; \
-		$(TARGET_CONFIGURE_ARGS) \
-		$(TARGET_CONFIGURE_OPTS) \
-		CFLAGS="$(TARGET_CFLAGS) $(ZLIB_PIC)" \
-		./configure \
-		$(ZLIB_SHARED) \
-		--prefix=/usr \
-	)
-endef
-
-define HOST_ZLIB_CONFIGURE_CMDS
-	(cd $(@D); rm -rf config.cache; \
-		$(HOST_CONFIGURE_ARGS) \
-		$(HOST_CONFIGURE_OPTS) \
-		./configure \
-		--prefix="$(HOST_DIR)" \
-		--sysconfdir="$(HOST_DIR)/etc" \
-	)
-endef
-
-define ZLIB_BUILD_CMDS
-	$(TARGET_MAKE_ENV) $(MAKE1) -C $(@D)
-endef
-
-define HOST_ZLIB_BUILD_CMDS
-	$(HOST_MAKE_ENV) $(MAKE1) -C $(@D)
-endef
-
-define ZLIB_INSTALL_STAGING_CMDS
-	$(TARGET_MAKE_ENV) $(MAKE1) -C $(@D) DESTDIR=$(STAGING_DIR) LDCONFIG=true install
-endef
-
-define ZLIB_INSTALL_TARGET_CMDS
-	$(TARGET_MAKE_ENV) $(MAKE1) -C $(@D) DESTDIR=$(TARGET_DIR) LDCONFIG=true install
-endef
-
-# We don't care removing the .a from target, since it not used at link
-# time to build other packages, and it is anyway removed later before
-# assembling the filesystem images anyway.
-ifeq ($(BR2_SHARED_LIBS),y)
-define ZLIB_RM_STATIC_STAGING
-	rm -f $(STAGING_DIR)/usr/lib/libz.a
-endef
-ZLIB_POST_INSTALL_STAGING_HOOKS += ZLIB_RM_STATIC_STAGING
-endif
-
-define HOST_ZLIB_INSTALL_CMDS
-	$(HOST_MAKE_ENV) $(MAKE1) -C $(@D) LDCONFIG=true install
-endef
-
-$(eval $(generic-package))
-$(eval $(host-generic-package))
+$(eval $(virtual-package))
+$(eval $(host-virtual-package))