CMake: incomplete DPPAsExternalProject impl

CMakeLists.txt

@@ -63,7 +63,12 @@ if (WITH_BOOST)
 endif()
 
 # D++ Discord API Library for Bots
-find_package(DPP REQUIRED)
+option(WITH_DPP_AS_EXTERNAL_PROJECT "Build with DPP as External Project" OFF)
+if (WITH_DPP_AS_EXTERNAL_PROJECT)
+    include(DPPAsExternalProject)
+else()
+    find_package(DPP REQUIRED)
+endif()
 
 # pthread Support
 set(THREADS_PREFER_PTHREAD_FLAG ON)

cmake/DPPAsExternalProject.cmake

@@ -0,0 +1,77 @@
+#[[**************************************************************************
+* dtranslatebot Discord Translate Bot
+* Copyright (C) 2024 Syping
+*
+* Redistribution and use in source and binary forms, with or without modification,
+* are permitted provided that the following conditions are met:
+*
+* 1. Redistributions of source code must retain the above copyright notice,
+* this list of conditions and the following disclaimer.
+*
+* 2. Redistributions in binary form must reproduce the above copyright notice,
+* this list of conditions and the following disclaimer in the documentation
+* and/or other materials provided with the distribution.
+*
+* This software is provided as-is, no warranties are given to you, we are not
+* responsible for anything with use of the software, you are self responsible.
+****************************************************************************]]
+
+# OpenSSL needs to build with make
+find_program(MAKE_EXECUTABLE NAMES make gmake)
+if (NOT MAKE_EXECUTABLE)
+    message(SEND_ERROR "make not found")
+endif()
+
+find_program(NPROC_EXECUTABLE nproc)
+if (NPROC_EXECUTABLE)
+    execute_process(
+        COMMAND ${NPROC_EXECUTABLE}
+        OUTPUT_VARIABLE NPROC
+    )
+    set(JOBS_ARGUMENT "-j${NPROC}" CACHE STRING "make jobs argument")
+endif()
+
+include(ExternalProject)
+ExternalProject_Add(ZLIB
+    URL https://www.zlib.net/zlib-1.3.1.tar.xz
+    URL_HASH SHA256=38ef96b8dfe510d42707d9c781877914792541133e1870841463bfa73f883e32
+    DOWNLOAD_EXTRACT_TIMESTAMP TRUE
+    CMAKE_ARGS
+        -DBUILD_SHARED_LIBS=OFF
+        "-DCMAKE_INSTALL_PREFIX=<INSTALL_DIR>"
+        -DZLIB_BUILD_EXAMPLES=OFF
+)
+ExternalProject_Get_Property(ZLIB INSTALL_DIR)
+set(ZLIB_INSTALL_DIR ${INSTALL_DIR})
+
+ExternalProject_Add(OpenSSL
+    URL https://www.openssl.org/source/openssl-3.0.13.tar.gz
+    URL_HASH SHA256=88525753f79d3bec27d2fa7c66aa0b92b3aa9498dafd93d7cfa4b3780cdae313
+    DOWNLOAD_EXTRACT_TIMESTAMP TRUE
+    CONFIGURE_COMMAND
+        "<SOURCE_DIR>/config"
+        "--prefix=<INSTALL_DIR>"
+        "--api=1.1.1"
+        no-deprecated
+        no-dtls
+        no-shared
+        no-zlib
+    BUILD_COMMAND ${MAKE_EXECUTABLE} ${JOBS_ARGUMENT}
+    INSTALL_COMMAND ${MAKE_EXECUTABLE} ${JOBS_ARGUMENT} install_sw
+)
+ExternalProject_Get_Property(OpenSSL INSTALL_DIR)
+set(OpenSSL_INSTALL_DIR ${INSTALL_DIR})
+
+ExternalProject_Add(DPP
+    GIT_REPOSITORY https://github.com/brainboxdotcc/DPP.git
+    GIT_TAG 46044c8f80134633f7b396b4d5814f83d54a96d3
+    CMAKE_ARGS
+        -DBUILD_SHARED_LIBS=OFF
+        -DBUILD_VOICE_SUPPORT=OFF
+        "-DCMAKE_INSTALL_PREFIX=<INSTALL_DIR>"
+        -DDPP_NO_VCPKG=ON
+        "-DOpenSSL_ROOT=${OpenSSL_INSTALL_DIR}"
+        "-DZLIB_ROOT=${ZLIB_INSTALL_DIR}"
+    DEPENDS OpenSSL
+    DEPENDS ZLIB
+)