Fix compilation of ASIO and WASAPI backends in MingW/Ubuntu.

Warnings/errors "unused function" are from the unicode conversion
functions on Windows, and "unused but set variable" is from ASIO
source code; we disable these warnings on Windows builds.

.travis.yml

@@ -30,28 +30,28 @@ matrix:
     env: HOST="" API="oss"
     compiler: clang
   - os: linux
-    env: HOST="--host=i686-w64-mingw32" API="winmm"
+    env: HOST="--host=i686-w64-mingw32" API="winmm" CPPFLAGS="-Wno-unused-function"
     compiler: gcc
   - os: linux
-    env: HOST="--host=x86_64-w64-mingw32" API="winmm"
+    env: HOST="--host=x86_64-w64-mingw32" API="winmm" CPPFLAGS="-Wno-unused-function"
     compiler: gcc
   - os: linux
-    env: HOST="--host=i686-w64-mingw32" API="dsound"
+    env: HOST="--host=i686-w64-mingw32" API="dsound" CPPFLAGS="-Wno-unused-function"
     compiler: gcc
   - os: linux
-    env: HOST="--host=x86_64-w64-mingw32" API="dsound"
+    env: HOST="--host=x86_64-w64-mingw32" API="dsound" CPPFLAGS="-Wno-unused-function"
     compiler: gcc
   - os: linux
-    env: HOST="--host=i686-w64-mingw32" API="asio"
+    env: HOST="--host=i686-w64-mingw32" API="asio" CPPFLAGS="-Wno-unused-function -Wno-unused-but-set-variable"
     compiler: gcc
   - os: linux
-    env: HOST="--host=x86_64-w64-mingw32" API="asio"
+    env: HOST="--host=x86_64-w64-mingw32" API="asio" CPPFLAGS="-Wno-unused-function -Wno-unused-but-set-variable"
     compiler: gcc
   - os: linux
-    env: HOST="--host=i686-w64-mingw32" API="wasapi"
+    env: HOST="--host=i686-w64-mingw32" API="wasapi" CPPFLAGS="-Wno-unused-function"
     compiler: gcc
   - os: linux
-    env: HOST="--host=x86_64-w64-mingw32" API="wasapi"
+    env: HOST="--host=x86_64-w64-mingw32" API="wasapi" CPPFLAGS="-Wno-unused-function"
     compiler: gcc
   # jack and asound not found on ARM gnueabihf
   # - os: linux

Makefile.am

@@ -13,10 +13,10 @@ lib_LTLIBRARIES = %D%/librtaudio.la
 
 if ASIO
 %C%_librtaudio_la_SOURCES += \
-	asio.cpp \
-	asiodrivers.cpp \
-	asiolist.cpp \
-	iasiothiscallresolver.cpp
+	include/asio.cpp \
+	include/asiodrivers.cpp \
+	include/asiolist.cpp \
+	include/iasiothiscallresolver.cpp
 endif
 
 rtaudio_incdir = $(includedir)/rtaudio

RtAudio.cpp

@@ -4458,7 +4458,7 @@ bool RtApiWasapi::probeDeviceOpen( unsigned int device, StreamMode mode, unsigne
   if ( sampleRate != deviceInfo.preferredSampleRate )
   {
     errorType = RtAudioError::INVALID_USE;
-    std::stringstring ss;
+    std::stringstream ss;
     ss << "RtApiWasapi::probeDeviceOpen: " << sampleRate
        << "Hz sample rate not supported. This device only supports "
        << deviceInfo.preferredSampleRate << "Hz.";

configure.ac

@@ -226,6 +226,7 @@ AS_CASE([$host],
     AC_MSG_RESULT([using ASIO])
     api="$api -D__WINDOWS_ASIO__"
     use_asio=yes
+    CPPFLAGS="-I$srcdir/include $CPPFLAGS"
   ])
   # Look for DirectSound flag
   AS_IF([test "x$with_ds" = "xyes" ], [
@@ -238,6 +239,7 @@ AS_CASE([$host],
     AC_MSG_RESULT([using WASAPI])
     api="$api -D__WINDOWS_WASAPI__"
     LIBS="-lwinmm -luuid -lksuser $LIBS"
+    CPPFLAGS="-I$srcdir/include $CPPFLAGS"
   ])
   # If no audio api flags specified, use DS
   AS_IF([test "x$api" = "x" ], [