Added openmp configuration for gnu buid

configure.ac

@@ -78,10 +78,15 @@ AC_C_INLINE
 AC_ARG_ENABLE(integer-samples,
               [AC_HELP_STRING([--enable-integer-samples],
                               [use integer samples instead of floats
-[default=yes]])],,
+[default=no]])],,
               [enable_integer_samples=no])
 
 
+AC_ARG_ENABLE(openmp,
+              [AC_HELP_STRING([--enable-openmp],
+                              [use parallel multicore calculation through OpenMP [default=yes]])],,
+              [enable_openmp=yes])
+
 # Let the user enable/disable the x86 optimizations.
 # Useful when compiling on non-x86 architectures.
 AC_ARG_ENABLE([x86-optimizations],
@@ -105,6 +110,14 @@ else
 fi
 
 
+if test "x$enable_openmp" = "xyes"; then
+        echo "****** openmp optimizations enabled ******"
+        CXXFLAGS="-fopenmp $CXXFLAGS"
+else
+        echo "****** openmp optimizations disabled ******"
+fi
+
+
 # Check if optimizations are supported in the system at build time.
 if test "x$enable_x86_optimizations" = "xyes" -a "x$ac_cv_header_cpuid_h" = "xyes"; then
         echo "****** x86 optimizations enabled ******"

source/SoundStretch/Makefile.am

@@ -48,7 +48,7 @@ soundstretch_LDADD=../SoundTouch/libSoundTouch.la -lm
 #soundstretch_LDFLAGS=-s
 
 ## additional compiler flags
-soundstretch_CXXFLAGS=-O3 -fopenmp
+soundstretch_CXXFLAGS=-O3
 
 #clean-local: 
 #	-rm -f additional-files-to-remove-on-make-clean

source/SoundTouch/Makefile.am

@@ -34,7 +34,7 @@ libSoundTouch_la_SOURCES=AAFilter.cpp FIRFilter.cpp FIFOSampleBuffer.cpp    \
     InterpolateShannon.cpp
 
 # Compiler flags
-AM_CXXFLAGS=-O3 -fopenmp -I../../include 
+AM_CXXFLAGS=-O3 -I../../include 
 
 # Compile the files that need MMX and SSE individually.
 libSoundTouch_la_LIBADD=libSoundTouchMMX.la libSoundTouchSSE.la