Fix a few more GCC warnings

alc/backends/coreaudio.cpp

@@ -374,7 +374,8 @@ OSStatus CoreAudioCapture::RecordProc(AudioUnitRenderActionFlags*,
         audiobuf.list.mNumberBuffers = 2;
         audiobuf.list.mBuffers[0].mNumberChannels = mFormat.mChannelsPerFrame;
         audiobuf.list.mBuffers[0].mData = rec_vec.first.buf;
-        audiobuf.list.mBuffers[0].mDataByteSize = rec_vec.first.len * mFormat.mBytesPerFrame;
+        audiobuf.list.mBuffers[0].mDataByteSize = static_cast<UInt32>(rec_vec.first.len) *
+            mFormat.mBytesPerFrame;
         audiobuf.list.mBuffers[1].mNumberChannels = mFormat.mChannelsPerFrame;
         audiobuf.list.mBuffers[1].mData = rec_vec.second.buf;
         audiobuf.list.mBuffers[1].mDataByteSize = remaining * mFormat.mBytesPerFrame;

alc/backends/opensl.cpp

@@ -681,11 +681,11 @@ ALCenum OpenSLCapture::open(const ALCchar* name)
     {
         mFrameSize = mDevice->frameSizeFromFmt();
         /* Ensure the total length is at least 100ms */
-        ALsizei length{maxi(mDevice->BufferSize, mDevice->Frequency/10)};
+        ALuint length{maxu(mDevice->BufferSize, mDevice->Frequency/10)};
         /* Ensure the per-chunk length is at least 10ms, and no more than 50ms. */
-        ALsizei update_len{clampi(mDevice->BufferSize/3, mDevice->Frequency/100,
+        ALuint update_len{clampu(mDevice->BufferSize/3, mDevice->Frequency/100,
             mDevice->Frequency/100*5)};
-        ALsizei num_updates{(length+update_len-1) / update_len};
+        ALuint num_updates{(length+update_len-1) / update_len};
 
         try {
             mRing = CreateRingBuffer(num_updates, update_len*mFrameSize, false);

alc/backends/wasapi.cpp

@@ -429,6 +429,8 @@ constexpr char MessageStr[static_cast<unsigned int>(MsgType::Count)][20]{
 
 /* Proxy interface used by the message handler. */
 struct WasapiProxy {
+    virtual ~WasapiProxy() = default;
+
     virtual HRESULT openProxy() = 0;
     virtual void closeProxy() = 0;
 

alc/mixer/mixer_c.cpp

@@ -30,7 +30,7 @@ inline ALfloat do_bsinc(const InterpState &istate, const ALfloat *RESTRICT vals,
         (1.0f/(1<<FRAC_PHASE_BITDIFF))};
 #undef FRAC_PHASE_BITDIFF
 
-    const ALfloat *fil{istate.bsinc.filter + static_cast<ptrdiff_t>(istate.bsinc.m)*pi*4};
+    const ALfloat *fil{istate.bsinc.filter + istate.bsinc.m*static_cast<ptrdiff_t>(pi*4)};
     const ALfloat *scd{fil + istate.bsinc.m};
     const ALfloat *phd{scd + istate.bsinc.m};
     const ALfloat *spd{phd + istate.bsinc.m};

common/alcomplex.cpp

@@ -35,7 +35,7 @@ void complex_fft(const al::span<std::complex<double>> buffer, const double sign)
     for(size_t i{1u};i < fftsize;i<<=1, step<<=1)
     {
         const size_t step2{step >> 1};
-        double arg{al::MathDefs<double>::Pi() / step2};
+        double arg{al::MathDefs<double>::Pi() / static_cast<double>(step2)};
 
         std::complex<double> w{std::cos(arg), std::sin(arg)*sign};
         std::complex<double> u{1.0, 0.0};

examples/almultireverb.c

@@ -653,12 +653,12 @@ int main(int argc, char **argv)
          * Convert the difference to seconds.
          */
         curtime = altime_get();
-        timediff = (ALfloat)(curtime - basetime) / 1000.0f;
+        timediff = (float)(curtime - basetime) / 1000.0f;
 
         /* Avoid negative time deltas, in case of non-monotonic clocks. */
         if(timediff < 0.0f)
             timediff = 0.0f;
-        else while(timediff >= 4.0f*((loops&1)+1))
+        else while(timediff >= 4.0f*(float)((loops&1)+1))
         {
             /* For this example, each transition occurs over 4 seconds, and
              * there's 2 transitions per cycle.

utils/openal-info.c

@@ -53,7 +53,7 @@ static WCHAR *FromUTF8(const char *str)
 
     if((len=MultiByteToWideChar(CP_UTF8, 0, str, -1, NULL, 0)) > 0)
     {
-        out = calloc(sizeof(WCHAR), len);
+        out = calloc(sizeof(WCHAR), (unsigned int)(len));
         MultiByteToWideChar(CP_UTF8, 0, str, -1, out, len);
     }
     return out;