feat(cmake): add helper function endstone_add_plugin

cmake/EndstoneHeaders.cmake

@@ -1,6 +1,22 @@
-# ===============
+# EndstoneHeaders.cmake -- Build system for endstone plugins
+#
+# Copyright (c) 2024, The Endstone Project. (https://endstone.dev) All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# ===================
 # Compiler Check
-# ===============
+# ===================
 if (WIN32)
     if (NOT CMAKE_CXX_COMPILER_ID MATCHES "MSVC")
         message(FATAL_ERROR "MSVC is required on Windows.")
@@ -19,9 +35,9 @@ if (CMAKE_BUILD_TYPE STREQUAL "Debug")
 endif ()
 
 
-# ===============
+# ===================
 # Dependencies
-# ===============
+# ===================
 include(FetchContent)
 FetchContent_Declare(
         fmt
@@ -31,10 +47,27 @@ FetchContent_Declare(
 FetchContent_MakeAvailable(fmt)
 
 
-# ===============
+# ===================
 # Endstone API
-# ===============
+# ===================
 add_library(endstone_headers INTERFACE)
 add_library(endstone::headers ALIAS endstone_headers)
 target_include_directories(endstone_headers INTERFACE ${CMAKE_CURRENT_SOURCE_DIR}/include)
-target_link_libraries(endstone_headers INTERFACE fmt::fmt)
+target_link_libraries(endstone_headers INTERFACE fmt::fmt)
+
+# ===================
+# Endstone Add Plugin
+# ===================
+function(endstone_add_plugin target_name)
+    cmake_parse_arguments(PARSE_ARGV 1 ARG "" "" "")
+
+    add_library(${target_name} SHARED ${ARG_UNPARSED_ARGUMENTS})
+    target_include_directories(${target_name} PUBLIC include)
+    target_link_libraries(${target_name} PRIVATE endstone::headers)
+    set_target_properties(${target_name} PROPERTIES PREFIX "endstone_")
+
+    if (CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
+        target_compile_options(${target_name} PRIVATE -stdlib=libc++ -fPIC)
+        target_link_libraries(${target_name} PRIVATE -static-libgcc -static-libstdc++ libc++.a libc++abi.a)
+    endif ()
+endfunction()