desubmodulize portaudio - PLEASE READ

this is necessary in order to get Furnace to build using CMake 4.0.

you should do:

git submodule deinit extern/portaudio

extern/portaudio-modified/bindings/cpp/cmake/modules/FindASIO.cmake

@@ -0,0 +1,81 @@
+#[=======================================================================[.rst:
+FindASIO
+--------
+
+Finds the ASIO SDK by searching for the SDK ZIP in CMAKE_PREFIX_PATH and
+CMAKE_CURRENT_BINARY_DIR. Alternatively, you may manually specify the path of
+the SDK ZIP with the ASIO_SDK_ZIP_PATH variable, which can be used for caching
+in CI scripts.
+
+If the ZIP is found, this module extracts it.
+The ZIP extraction is skipped if the unzipped SDK is found.
+
+This module provides an `ASIO::host` IMPORT library target for building host
+applications which use ASIO drivers. If you want to build an ASIO driver, this
+module may serve as a useful start but you will need to modify it.
+
+#]=======================================================================]
+
+if(NOT WIN32)
+  message(WARNING "ASIO is only supported on Windows.")
+  set(ASIO_FOUND OFF)
+  return()
+endif()
+
+file(GLOB HEADER_FILE
+  "${CMAKE_CURRENT_BINARY_DIR}/asiosdk*/common/asio.h"
+  "${CMAKE_PREFIX_PATH}/asiosdk*/common/asio.h"
+  # The old build systems before PortAudio 19.8 used to look for the ASIO SDK
+  # in the same parent directory as the source code repository. This is no
+  # longer advised or documented but kept for backwards compatibility.
+  "${CMAKE_CURRENT_SOURCE_DIR}/../asiosdk*/common/asio.h"
+)
+if(NOT EXISTS "${HEADER_FILE}")
+  # The file(ARCHIVE_EXTRACT) command was added in CMake 3.18, so if using an
+  # older version of CMake, the user needs to extract it themselves.
+  if(CMAKE_VERSION VERSION_LESS 3.18)
+    message(STATUS "ASIO SDK NOT found. Download the ASIO SDK ZIP from "
+      "https://www.steinberg.net/asiosdk and extract it to "
+      "${CMAKE_PREFIX_PATH} or ${CMAKE_CURRENT_BINARY_DIR}"
+    )
+    return()
+  endif()
+  file(GLOB results
+    "${ASIO_SDK_ZIP_PATH}"
+    "${CMAKE_CURRENT_BINARY_DIR}/asiosdk*.zip"
+    "${CMAKE_PREFIX_PATH}/asiosdk*.zip"
+    "${CMAKE_CURRENT_SOURCE_DIR}/../asiosdk*.zip"
+  )
+  foreach(f ${results})
+    if(EXISTS "${f}")
+      message(STATUS "Extracting ASIO SDK ZIP archive: ${f}")
+      file(ARCHIVE_EXTRACT INPUT "${f}" DESTINATION "${CMAKE_CURRENT_BINARY_DIR}")
+    endif()
+  endforeach()
+  file(GLOB HEADER_FILE "${CMAKE_CURRENT_BINARY_DIR}/asiosdk*/common/asio.h")
+endif()
+
+get_filename_component(HEADER_DIR "${HEADER_FILE}" DIRECTORY)
+get_filename_component(ASIO_ROOT "${HEADER_DIR}" DIRECTORY)
+
+if(ASIO_ROOT)
+  set(ASIO_FOUND TRUE)
+  message(STATUS "Found ASIO SDK: ${ASIO_ROOT}")
+
+  if(ASIO_FOUND AND NOT TARGET ASIO::host)
+    add_library(ASIO::host INTERFACE IMPORTED)
+    target_sources(ASIO::host INTERFACE
+      "${ASIO_ROOT}/common/asio.cpp"
+      "${ASIO_ROOT}/host/asiodrivers.cpp"
+      "${ASIO_ROOT}/host/pc/asiolist.cpp"
+    )
+    target_include_directories(ASIO::host INTERFACE
+      "${ASIO_ROOT}/common"
+      "${ASIO_ROOT}/host"
+      "${ASIO_ROOT}/host/pc"
+    )
+    target_link_libraries(ASIO::host INTERFACE ole32 uuid)
+  endif()
+else()
+  message(STATUS "ASIO SDK NOT found")
+endif()

extern/portaudio-modified/bindings/cpp/cmake/modules/FindPortAudio.cmake

@@ -0,0 +1,39 @@
+
+macro(handle_default)
+
+endmacro()
+
+if(TARGET PortAudio::portaudio)
+  # nothing to do 
+  return()
+endif()
+# search for portaudio as cmake module
+find_package(PortAudio CONFIG QUIET)
+if(PortAudio_FOUND)
+  if(TARGET PortAudio::portaudio)  
+    return()  
+  elseif(TARGET portaudio)
+    # vcpkg and old portaudio installations do not provide the same targets
+    add_library(PortAudio::portaudio ALIAS portaudio)
+    return()
+  else()
+    message(FATAL_ERROR "PortAudio_FOUND but not target PortAudio::portaudio")  
+  endif()  
+endif()
+
+# search for portaudio via pkg-config
+
+message(STATUS "portaudio could not be found via cmake, specify PortAudio_DIR.\n Searching for it via pkg-config")
+find_package(PkgConfig REQUIRED)
+pkg_check_modules(portaudio REQUIRED QUIET IMPORTED_TARGET GLOBAL portaudio-2.0)
+add_library(PortAudio::portaudio ALIAS PkgConfig::portaudio)
+return()
+
+# include(FindPackageHandleStandardArgs)
+# find_package_handle_standard_args(Foo
+#   FOUND_VAR Foo_FOUND
+#   REQUIRED_VARS
+#     Foo_LIBRARY
+#     Foo_INCLUDE_DIR
+#   VERSION_VAR Foo_VERSION
+# )