Simplify PortAudio static build script.

cmake/Buildportaudio-2.0.cmake

@@ -1,77 +1,21 @@
-set(PORTAUDIO_GIT "https://github.com/PortAudio/portaudio.git")
+set(BUILD_SHARED_LIBS OFF CACHE STRING "Disable shared libraries for portaudio")
 
-# required linking libraries on linux. Not sure about windows.
-find_library(ALSA_LIBRARIES asound)
-
-if(UNIX AND NOT APPLE AND NOT ALSA_LIBRARIES)
-    message(ERROR "Could not find alsa library which is required for portaudio.
-On Linux systems try installing:
-    alsa-lib-devel  (RPM based systems)
-    libasound2-dev  (DEB based systems)"
-    )
-endif()
-
-# Make sure that configure knows what system we're using when cross-compiling.
-if(MINGW AND CMAKE_CROSSCOMPILING)
-    include(cmake/MinGW.cmake)
-    set(CONFIGURE_COMMAND ./configure --host=${HOST} --target=${HOST} --disable-cxx --disable-shared --with-winapi=wmme,directx --prefix=${CMAKE_BINARY_DIR}/external/dist)
-elseif(APPLE)
-if(BUILD_OSX_UNIVERSAL)
-    set(CONFIGURE_COMMAND ./configure --enable-mac-universal --enable-cxx --enable-option-checking --without-alsa --without-jack --without-oss --without-asihpi --without-winapi --disable-shared --prefix=${CMAKE_BINARY_DIR}/external/dist CFLAGS=-g\ -O2\ -mmacosx-version-min=10.9 LDFLAGS=-framework\ CoreServices\ -framework\ AudioUnit\ -framework\ CoreFoundation\ -framework\ AudioToolbox\ -framework\ CoreAudio)
-else()
-    set(CONFIGURE_COMMAND ./configure --enable-cxx --enable-option-checking --without-alsa --without-jack --without-oss --without-asihpi --without-winapi --disable-shared --prefix=${CMAKE_BINARY_DIR}/external/dist CFLAGS=-g\ -O2\ -mmacosx-version-min=10.9 LDFLAGS=-framework\ CoreServices\ -framework\ AudioUnit\ -framework\ CoreFoundation\ -framework\ AudioToolbox\ -framework\ CoreAudio)
-endif(BUILD_OSX_UNIVERSAL)
-else()
-    set(CONFIGURE_COMMAND ./configure --enable-cxx --without-jack --disable-shared --prefix=${CMAKE_BINARY_DIR}/external/dist)
-endif()
-
-include(ExternalProject)
-if(APPLE)
-ExternalProject_Add(portaudio
-    GIT_REPOSITORY ${PORTAUDIO_GIT}
-    GIT_TAG origin/master
-    BUILD_IN_SOURCE 1
-    INSTALL_DIR external/dist
-    CONFIGURE_COMMAND ${CONFIGURE_COMMAND}
-    BUILD_COMMAND $(MAKE)
-    INSTALL_COMMAND $(MAKE) install
+include(FetchContent)
+FetchContent_Declare(
+    portaudio
+    GIT_REPOSITORY https://github.com/PortAudio/portaudio.git
+    GIT_SHALLOW    TRUE
+    GIT_PROGRESS   TRUE
+    GIT_TAG        master
 )
-else()
-ExternalProject_Add(portaudio
-    GIT_REPOSITORY ${PORTAUDIO_GIT}
-    GIT_TAG origin/master
-    BUILD_IN_SOURCE 1
-    INSTALL_DIR external/dist
-    CONFIGURE_COMMAND ${CONFIGURE_COMMAND}
-    BUILD_COMMAND $(MAKE)
-    INSTALL_COMMAND $(MAKE) install
-)
-endif()
-set(PORTAUDIO_LIBRARIES ${CMAKE_BINARY_DIR}/external/dist/lib/libportaudio.a)
 
-if(WIN32)
-    find_library(WINMM winmm)
-    find_library(DSOUND dsound)
-    list(APPEND PORTAUDIO_LIBRARIES ${WINMM} ${DSOUND}
-)
-elseif(NOT APPLE)
-    find_library(RT rt)
-    find_library(ASOUND asound)
-    list(APPEND PORTAUDIO_LIBRARIES ${RT} ${ASOUND}
-    )
-endif(WIN32)
-include_directories(${CMAKE_BINARY_DIR}/external/dist/include)
-
-# Add the portaudio library to the list of libraries that must be linked.
-list(APPEND FREEDV_LINK_LIBS ${PORTAUDIO_LIBRARIES})
-if (APPLE)
-    list(APPEND FREEDV_LINK_LIBS 
-        "-framework CoreServices"
-        "-framework AudioUnit"
-        "-framework CoreFoundation"
-        "-framework AudioToolbox"
-        "-framework CoreAudio")
+FetchContent_GetProperties(portaudio)
+if(NOT portaudio_POPULATED)
+  FetchContent_Populate(portaudio)
+  add_subdirectory(${portaudio_SOURCE_DIR} ${portaudio_BINARY_DIR} EXCLUDE_FROM_ALL)
 endif()
 
-# Setup a dependency so that this gets built before linking to freedv.
-list(APPEND FREEDV_STATIC_DEPS portaudio)
+list(APPEND FREEDV_LINK_LIBS PortAudio)
+list(APPEND FREEDV_STATIC_DEPS PortAudio)
+
+include_directories(${portaudio_SOURCE_DIR}/include)