Cmake improvements (#4076)

- Utilizes the standard CMake variable BUILD_SHARED_LIBS to simplify the CMake configuration.
- Allows the use of a single library definition for both static and
  shared library cases, improving maintainability and readability of the CMake configuration.
- Install vmlib public header files
- Installs the public header files for the vmlib target to the include/iwasm directory.
- Install cmake package
- Adds the necessary CMake configuration files (iwasmConfig.cmake and iwasmConfigVersion.cmake).
- Configures the installation of these files to the appropriate directory (lib/cmake/iwasm).
- Ensures compatibility with the same major version.
- Improve windows product-mini CMakeLists.txt
- Fix missing symbols when linking windows product-mini with shared vmlib
- Improve Darwin product-mini CMakeLists.txt

---------

Signed-off-by: Peter Tatrai <peter.tatrai.ext@siemens.com>

build-scripts/config_common.cmake

@@ -134,6 +134,9 @@ endif ()
 # Version
 include (${WAMR_ROOT_DIR}/build-scripts/version.cmake)
 
+# Package
+include (${WAMR_ROOT_DIR}/build-scripts/package.cmake)
+
 # Sanitizers
 
 if (NOT DEFINED WAMR_BUILD_SANITIZER)
@@ -211,7 +214,9 @@ endif ()
 
 message ("-- Build Configurations:")
 message ("     Build as target ${WAMR_BUILD_TARGET}")
+message ("     Build for platform ${WAMR_BUILD_PLATFORM}")
 message ("     CMAKE_BUILD_TYPE " ${CMAKE_BUILD_TYPE})
+message ("     BUILD_SHARED_LIBS " ${BUILD_SHARED_LIBS})
 ################## running mode ##################
 if (WAMR_BUILD_INTERP EQUAL 1)
   message ("     WAMR Interpreter enabled")

build-scripts/iwasmConfig.cmake.in

@@ -0,0 +1,6 @@
+# Copyright (C) 2019 Intel Corporation.  All rights reserved.
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+
+@PACKAGE_INIT@
+
+include("${CMAKE_CURRENT_LIST_DIR}/iwasmTargets.cmake")

build-scripts/package.cmake

@@ -0,0 +1,28 @@
+# Copyright (C) 2019 Intel Corporation.  All rights reserved.
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+
+function(install_iwasm_package)
+    install (EXPORT iwasmTargets
+        FILE iwasmTargets.cmake
+        NAMESPACE iwasm::
+        DESTINATION lib/cmake/iwasm
+    )
+
+    include (CMakePackageConfigHelpers)
+    configure_package_config_file (${CMAKE_CURRENT_FUNCTION_LIST_DIR}/iwasmConfig.cmake.in
+        "${CMAKE_CURRENT_BINARY_DIR}/iwasmConfig.cmake"
+        INSTALL_DESTINATION lib/cmake/iwasm
+    )
+
+    write_basic_package_version_file(
+        "${CMAKE_CURRENT_BINARY_DIR}/iwasmConfigVersion.cmake"
+        VERSION ${WAMR_VERSION_MAJOR}.${WAMR_VERSION_MINOR}.${WAMR_VERSION_PATCH}
+        COMPATIBILITY SameMajorVersion
+    )
+
+    install (FILES
+        "${CMAKE_CURRENT_BINARY_DIR}/iwasmConfig.cmake"
+        "${CMAKE_CURRENT_BINARY_DIR}/iwasmConfigVersion.cmake"
+        DESTINATION lib/cmake/iwasm
+    )
+endfunction()