package/poco: convert to CMake package

Currently when building with make, the cmake config files are not
generated. This leads to problems when integrating the package in an
application built with cmake.

The CMake build system links the PDF component against the system
libpng when POCO_UNBUNDLED is enabled, while the legacy make build
system always used the bundled copy, so select libpng for the PDF
component.

POCO_NO_FPENVIRONMENT and POCO_NO_WSTRING are plain preprocessor
defines rather than CMake options, so pass them through CMAKE_CXX_FLAGS.

Poco is built as a set of shared libraries, so -latomic has to be
passed via CMAKE_SHARED_LINKER_FLAGS as well.

Disable File2Page along with PageCompiler, and tie the ActiveRecord
compiler to the ActiveRecord component, to match what the legacy make
build system omitted.

This patch is based on this one:
https://lists.buildroot.org/pipermail/buildroot/2026-April/801019.html

Signed-off-by: Yegor Yefremov <yegorslists@googlemail.com>
Assisted-by: Claude:claude-opus-5
Signed-off-by: Bernd Kuhls <bernd@kuhls.net>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/poco/Config.in

@@ -94,6 +94,7 @@ config BR2_PACKAGE_POCO_NETSSL_OPENSSL
 
 config BR2_PACKAGE_POCO_PDF
 	bool "PDF"
+	select BR2_PACKAGE_LIBPNG
 	select BR2_PACKAGE_POCO_JSON
 	select BR2_PACKAGE_POCO_UTIL
 	select BR2_PACKAGE_POCO_XML

package/poco/poco.mk

@@ -22,80 +22,60 @@ POCO_DEPENDENCIES = \
 	$(if $(BR2_PACKAGE_POCO_DATA_SQLITE),sqlite) \
 	$(if $(BR2_PACKAGE_POCO_DATA_PGSQL),postgresql) \
 	$(if $(BR2_PACKAGE_POCO_NETSSL_OPENSSL),openssl) \
+	$(if $(BR2_PACKAGE_POCO_PDF),libpng) \
 	$(if $(BR2_PACKAGE_POCO_XML),expat)
 
-POCO_OMIT = \
-	Data/ODBC \
-	PageCompiler \
-	$(if $(BR2_PACKAGE_POCO_ACTIVERECORD),,ActiveRecord) \
-	$(if $(BR2_PACKAGE_POCO_CPP_PARSER),,CppParser) \
-	$(if $(BR2_PACKAGE_POCO_CRYPTO),,Crypto) \
-	$(if $(BR2_PACKAGE_POCO_DATA),,Data) \
-	$(if $(BR2_PACKAGE_POCO_DATA_MYSQL),,Data/MySQL) \
-	$(if $(BR2_PACKAGE_POCO_DATA_SQLITE),,Data/SQLite) \
-	$(if $(BR2_PACKAGE_POCO_DATA_PGSQL),,Data/PostgreSQL) \
-	$(if $(BR2_PACKAGE_POCO_JSON),,JSON) \
-	$(if $(BR2_PACKAGE_POCO_JWT),,JWT) \
-	$(if $(BR2_PACKAGE_POCO_MONGODB),,MongoDB) \
-	$(if $(BR2_PACKAGE_POCO_NET),,Net) \
-	$(if $(BR2_PACKAGE_POCO_NETSSL_OPENSSL),,NetSSL_OpenSSL) \
-	$(if $(BR2_PACKAGE_POCO_PDF),,PDF) \
-	$(if $(BR2_PACKAGE_POCO_PROMETHEUS),,Prometheus) \
-	$(if $(BR2_PACKAGE_POCO_REDIS),,Redis) \
-	$(if $(BR2_PACKAGE_POCO_UTIL),,Util) \
-	$(if $(BR2_PACKAGE_POCO_XML),,XML) \
-	$(if $(BR2_PACKAGE_POCO_ZIP),,Zip)
+# PageCompiler and File2Page are code generators that are of no use on
+# the target, and ODBC support is not wired up in Buildroot.
+POCO_CONF_OPTS = \
+	-DENABLE_DATA_ODBC=OFF \
+	-DENABLE_PAGECOMPILER=OFF \
+	-DENABLE_PAGECOMPILER_FILE2PAGE=OFF \
+	-DENABLE_ACTIVERECORD=$(if $(BR2_PACKAGE_POCO_ACTIVERECORD),ON,OFF) \
+	-DENABLE_ACTIVERECORD_COMPILER=$(if $(BR2_PACKAGE_POCO_ACTIVERECORD),ON,OFF) \
+	-DENABLE_CPPPARSER=$(if $(BR2_PACKAGE_POCO_CPP_PARSER),ON,OFF) \
+	-DENABLE_CRYPTO=$(if $(BR2_PACKAGE_POCO_CRYPTO),ON,OFF) \
+	-DENABLE_DATA=$(if $(BR2_PACKAGE_POCO_DATA),ON,OFF) \
+	-DENABLE_DATA_MYSQL=$(if $(BR2_PACKAGE_POCO_DATA_MYSQL),ON,OFF) \
+	-DENABLE_DATA_SQLITE=$(if $(BR2_PACKAGE_POCO_DATA_SQLITE),ON,OFF) \
+	-DENABLE_DATA_POSTGRESQL=$(if $(BR2_PACKAGE_POCO_DATA_PGSQL),ON,OFF) \
+	-DENABLE_JSON=$(if $(BR2_PACKAGE_POCO_JSON),ON,OFF) \
+	-DENABLE_JWT=$(if $(BR2_PACKAGE_POCO_JWT),ON,OFF) \
+	-DENABLE_MONGODB=$(if $(BR2_PACKAGE_POCO_MONGODB),ON,OFF) \
+	-DENABLE_NET=$(if $(BR2_PACKAGE_POCO_NET),ON,OFF) \
+	-DENABLE_NETSSL=$(if $(BR2_PACKAGE_POCO_NETSSL_OPENSSL),ON,OFF) \
+	-DENABLE_PDF=$(if $(BR2_PACKAGE_POCO_PDF),ON,OFF) \
+	-DENABLE_PROMETHEUS=$(if $(BR2_PACKAGE_POCO_PROMETHEUS),ON,OFF) \
+	-DENABLE_REDIS=$(if $(BR2_PACKAGE_POCO_REDIS),ON,OFF) \
+	-DENABLE_UTIL=$(if $(BR2_PACKAGE_POCO_UTIL),ON,OFF) \
+	-DENABLE_XML=$(if $(BR2_PACKAGE_POCO_XML),ON,OFF) \
+	-DENABLE_ZIP=$(if $(BR2_PACKAGE_POCO_ZIP),ON,OFF) \
+	-DPOCO_UNBUNDLED=ON
+
+# POCO_NO_FPENVIRONMENT and POCO_NO_WSTRING are plain preprocessor
+# defines, not CMake options, so they have to be passed as compiler flags.
+POCO_CXXFLAGS = $(TARGET_CXXFLAGS)
 
 ifeq ($(BR2_TOOLCHAIN_USES_UCLIBC),y)
-POCO_CONF_OPTS += --no-fpenvironment --no-wstring
+POCO_CXXFLAGS += -DPOCO_NO_FPENVIRONMENT -DPOCO_NO_WSTRING
 endif
 
 # architectures missing some FE_* in their fenv.h
 ifeq ($(BR2_sh4a),y)
-POCO_CONF_OPTS += --no-fpenvironment
+POCO_CXXFLAGS += -DPOCO_NO_FPENVIRONMENT
 endif
 
 # disable fpenvironment for soft floating point configuration
 ifeq ($(BR2_SOFT_FLOAT),y)
-POCO_CONF_OPTS += --no-fpenvironment
+POCO_CXXFLAGS += -DPOCO_NO_FPENVIRONMENT
 endif
 
-POCO_MAKE_TARGET = shared_release
+POCO_CONF_OPTS += -DCMAKE_CXX_FLAGS="$(POCO_CXXFLAGS)"
 
-POCO_LDFLAGS=$(TARGET_LDFLAGS)
 ifeq ($(BR2_TOOLCHAIN_HAS_LIBATOMIC),y)
-POCO_LDFLAGS += -latomic
+POCO_CONF_OPTS += \
+	-DCMAKE_EXE_LINKER_FLAGS=-latomic \
+	-DCMAKE_SHARED_LINKER_FLAGS=-latomic
 endif
 
-define POCO_CONFIGURE_CMDS
-	(cd $(@D); $(TARGET_MAKE_ENV) ./configure \
-		--config=Linux \
-		--prefix=/usr \
-		--ldflags="$(POCO_LDFLAGS)" \
-		--omit="$(POCO_OMIT)" \
-		$(POCO_CONF_OPTS) \
-		--unbundled \
-		--no-tests \
-		--no-samples)
-endef
-
-define POCO_BUILD_CMDS
-	$(TARGET_MAKE_ENV) $(MAKE) POCO_TARGET_OSARCH=$(ARCH) CROSS_COMPILE=$(TARGET_CROSS) \
-		POCO_MYSQL_INCLUDE=$(STAGING_DIR)/usr/include/mysql \
-		POCO_MYSQL_LIB=$(STAGING_DIR)/usr/lib/mysql \
-		POCO_PGSQL_INCLUDE=$(STAGING_DIR)/usr/include/postgresql \
-		POCO_PGSQL_LIB=$(STAGING_DIR)/usr/lib/postgresql \
-		DEFAULT_TARGET=$(POCO_MAKE_TARGET) -C $(@D)
-endef
-
-define POCO_INSTALL_STAGING_CMDS
-	$(TARGET_MAKE_ENV) $(MAKE) DESTDIR=$(STAGING_DIR) POCO_TARGET_OSARCH=$(ARCH) \
-		DEFAULT_TARGET=$(POCO_MAKE_TARGET) install -C $(@D)
-endef
-
-define POCO_INSTALL_TARGET_CMDS
-	$(TARGET_MAKE_ENV) $(MAKE) DESTDIR=$(TARGET_DIR) POCO_TARGET_OSARCH=$(ARCH) \
-		DEFAULT_TARGET=$(POCO_MAKE_TARGET) install -C $(@D)
-endef
-
-$(eval $(generic-package))
+$(eval $(cmake-package))