Updated the cmake file to link the libraries, not just include headers.

Signed-off-by: santorac <[email protected]>

package-system/libpng/Findlibpng.cmake

@@ -0,0 +1,42 @@
+#
+# Copyright (c) Contributors to the Open 3D Engine Project.
+# For complete copyright and license terms please see the LICENSE at the root of this distribution.
+# 
+# SPDX-License-Identifier: Apache-2.0 OR MIT
+#
+#
+
+set(MY_NAME "libpng")
+
+set(TARGET_WITH_NAMESPACE "3rdParty::${MY_NAME}")
+
+set(${MY_NAME}_INCLUDE_DIR ${CMAKE_CURRENT_LIST_DIR}/${MY_NAME}/include)
+set(${MY_NAME}_LIBS_DIR ${CMAKE_CURRENT_LIST_DIR}/${MY_NAME}/lib)
+
+if (${PAL_PLATFORM_NAME} STREQUAL "Linux")
+    set(${MY_NAME}_LIBRARY_DEBUG   ${${MY_NAME}_LIBS_DIR}/libpng16.a)
+    set(${MY_NAME}_LIBRARY_RELEASE ${${MY_NAME}_LIBS_DIR}/libpng16.a)
+elseif(${PAL_PLATFORM_NAME} STREQUAL "Android")
+    set(${MY_NAME}_LIBRARY_DEBUG   ${${MY_NAME}_LIBS_DIR}/libpng16.a)
+    set(${MY_NAME}_LIBRARY_RELEASE ${${MY_NAME}_LIBS_DIR}/libpng16.a)
+elseif(${PAL_PLATFORM_NAME} STREQUAL "Windows")
+    set(${MY_NAME}_LIBRARY_DEBUG   ${${MY_NAME}_LIBS_DIR}/libpng16_staticd.lib)
+    set(${MY_NAME}_LIBRARY_RELEASE ${${MY_NAME}_LIBS_DIR}/libpng16_static.lib)
+elseif(${PAL_PLATFORM_NAME} STREQUAL "Mac")
+    set(${MY_NAME}_LIBRARY_DEBUG   ${${MY_NAME}_LIBS_DIR}/libpng16.a)
+    set(${MY_NAME}_LIBRARY_RELEASE ${${MY_NAME}_LIBS_DIR}/libpng16.a)
+elseif(${PAL_PLATFORM_NAME} STREQUAL "iOS")
+    set(${MY_NAME}_LIBRARY_DEBUG   ${${MY_NAME}_LIBS_DIR}/libpng16.a)
+    set(${MY_NAME}_LIBRARY_RELEASE ${${MY_NAME}_LIBS_DIR}/libpng16.a)
+endif()
+
+# we set it to a generator expression for multi-config situations:
+set(libpng_LIBRARY                   "$<$<CONFIG:profile>:${libpng_LIBRARY_RELEASE}>")
+set(libpng_LIBRARY ${libpng_LIBRARY} "$<$<CONFIG:Release>:${libpng_LIBRARY_RELEASE}>")
+set(libpng_LIBRARY ${libpng_LIBRARY} "$<$<CONFIG:Debug>:${libpng_LIBRARY_DEBUG}>")
+
+add_library(${TARGET_WITH_NAMESPACE} INTERFACE IMPORTED GLOBAL)
+ly_target_include_system_directories(TARGET ${TARGET_WITH_NAMESPACE} INTERFACE ${${MY_NAME}_INCLUDE_DIR})
+target_link_libraries(${TARGET_WITH_NAMESPACE} INTERFACE ${libpng_LIBRARY})
+
+set(${MY_NAME}_FOUND True)

package-system/libpng/Findlibpng.cmake.template

@@ -1,16 +0,0 @@
-#
-# Copyright (c) Contributors to the Open 3D Engine Project.
-# For complete copyright and license terms please see the LICENSE at the root of this distribution.
-# 
-# SPDX-License-Identifier: Apache-2.0 OR MIT
-#
-#
-
-set(MY_NAME "libpng")
-set(TARGET_WITH_NAMESPACE "3rdParty::$${MY_NAME}")
-set($${MY_NAME}_INCLUDE_DIR $${CMAKE_CURRENT_LIST_DIR}/libpng/include)
-
-add_library($${TARGET_WITH_NAMESPACE} INTERFACE IMPORTED GLOBAL)
-
-ly_target_include_system_directories(TARGET $${TARGET_WITH_NAMESPACE} INTERFACE $${$${MY_NAME}_INCLUDE_DIR})
-set($${MY_NAME}_FOUND True)

package-system/libpng/build_config.json

@@ -6,7 +6,7 @@
     "package_url": "http://www.libpng.org/",
     "package_license": "libpng-2.0",
     "package_license_file": "LICENSE",
-    "cmake_find_template": "Findlibpng.cmake.template",
+    "cmake_find_source": "Findlibpng.cmake",
     "cmake_find_target": "Findlibpng.cmake",
     "Platforms": {
         "Windows": {