Initial commit

bot/external/Botcraft/cmake/zlib.cmake

@@ -0,0 +1,52 @@
+# Add zlib library
+
+# We first try to find zlib in the system
+if(NOT BOTCRAFT_FORCE_LOCAL_ZLIB)
+    find_package(ZLIB QUIET)
+endif()
+
+# If not found, build from sources
+if(NOT TARGET ZLIB::ZLIB)
+    set(ZLIB_SRC_PATH "${CMAKE_CURRENT_SOURCE_DIR}/3rdparty/zlib/")
+    set(ZLIB_BUILD_PATH "${CMAKE_CURRENT_BINARY_DIR}/3rdparty/zlib")
+
+    file(GLOB RESULT "${ZLIB_BUILD_PATH}/install")
+    list(LENGTH RESULT RES_LEN)
+    if(RES_LEN EQUAL 0)
+        message(STATUS "Can't find Zlib, cloning and building it from sources")
+
+        file(GLOB RESULT "${ZLIB_SRC_PATH}")
+        list(LENGTH RESULT RES_LEN)
+        if(RES_LEN EQUAL 0)
+            execute_process(COMMAND git submodule update --init -- 3rdparty/zlib WORKING_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}")
+        endif()
+
+        file(MAKE_DIRECTORY "${ZLIB_BUILD_PATH}")
+
+        execute_process(
+            COMMAND "${CMAKE_COMMAND}" "${ZLIB_SRC_PATH}" "-G" "${CMAKE_GENERATOR}" "-A" "${CMAKE_GENERATOR_PLATFORM}" "-DCMAKE_MAKE_PROGRAM=${CMAKE_MAKE_PROGRAM}" "-DCMAKE_BUILD_TYPE=Release" "-DCMAKE_INSTALL_PREFIX=install" "-DCMAKE_POSITION_INDEPENDENT_CODE=ON"
+            WORKING_DIRECTORY "${ZLIB_BUILD_PATH}")
+
+        execute_process(COMMAND "${CMAKE_COMMAND}" "--build" "." "--target" "install" "--parallel" "2" "--config" "Release" WORKING_DIRECTORY "${ZLIB_BUILD_PATH}")
+    endif()
+
+    # Find the freshly built library
+
+    # From 3.24 there is a cmake option to find zlib static
+    # but before, we need to do it in a more manual way
+    if(${CMAKE_VERSION} VERSION_LESS "3.24.0")
+        set(_CMAKE_FIND_LIBRARY_SUFFIXES ${CMAKE_FIND_LIBRARY_SUFFIXES})
+        set(CMAKE_FIND_LIBRARY_SUFFIXES "static.lib" ".a")
+    else()
+        set(ZLIB_USE_STATIC_LIBS "ON")
+    endif()
+
+    set(ZLIB_ROOT "${ZLIB_BUILD_PATH}/install")
+    find_package(ZLIB QUIET)
+
+    # Revert library suffix to what they were
+    if(${CMAKE_VERSION} VERSION_LESS "3.24.0")
+        set(CMAKE_FIND_LIBRARY_SUFFIXES ${_CMAKE_FIND_LIBRARY_SUFFIXES}) 
+        unset(_CMAKE_FIND_LIBRARY_SUFFIXES)
+    endif()
+endif()