replaced alloca() (a.k.a. cvStackAlloc) with AutoBuffer or vector() everywhere.…

replaced alloca() (a.k.a. cvStackAlloc) with AutoBuffer or vector() everywhere. cvStackAlloc() is still defined, but we do not need alloca() anymore to compile and run OpenCV (fixes #889 and may be some others)

modules/ml/src/svm.cpp

@@ -2006,16 +2006,8 @@ float CvSVM::predict( const float* row_sample, int row_len, bool returnDFVal ) c
                   params.svm_type == ONE_CLASS ? 1 : 0;
 
     float result = 0;
-    bool local_alloc = 0;
-    float* buffer = 0;
-    int buf_sz = sv_total*sizeof(buffer[0]) + (class_count+1)*sizeof(int);
-    if( buf_sz <= CV_MAX_LOCAL_SIZE )
-    {
-        buffer = (float*)cvStackAlloc( buf_sz );
-        local_alloc = true;
-    }
-    else
-        buffer = (float*)cvAlloc( buf_sz );
+    cv::AutoBuffer<float> _buffer(sv_total + (class_count+1)*2);
+    float* buffer = _buffer;
 
     if( params.svm_type == EPS_SVR ||
         params.svm_type == NU_SVR ||
@@ -2065,8 +2057,6 @@ float CvSVM::predict( const float* row_sample, int row_len, bool returnDFVal ) c
     else
         CV_Error( CV_StsBadArg, "INTERNAL ERROR: Unknown SVM type, "
                                 "the SVM structure is probably corrupted" );
-    if( !local_alloc )
-        cvFree( &buffer );
 
     return result;
 }