cmake: detect openMP

CMakeLists.txt

@@ -500,6 +500,20 @@ else ( enable-readline )
   unset ( READLINE_LIBS CACHE )
 endif ( enable-readline )
 
+unset ( HAVE_OPENMP CACHE )
+find_package ( OpenMP QUIET )
+if ( OpenMP_FOUND OR OpenMP_C_FOUND )
+    message(STATUS "Found OpenMP ${OpenMP_C_SPEC_DATE}")
+    # require at least OMP 4.0
+    if ( ( NOT OpenMP_C_SPEC_DATE LESS "201307" ) OR NOT ( OpenMP_C_VERSION VERSION_LESS "4.0" ) )
+        set ( CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${OpenMP_C_FLAGS}" )
+        set ( CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${OpenMP_CXX_FLAGS}" )
+        set ( CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${OpenMP_EXE_LINKER_FLAGS}" )
+        set ( LIBFLUID_LIBS "${OpenMP_C_LIBRARIES};${LIBFLUID_LIBS}" )
+        set ( HAVE_OPENMP 1 )
+    endif()
+endif()
+
 
 if(enable-tests)
     # manipulate some variables to setup a proper test env

cmake_admin/report.cmake

@@ -127,6 +127,12 @@ else ( WITH_PROFILING )
   message ( "Profiling:             no" )
 endif ( WITH_PROFILING )
 
+if ( HAVE_OPENMP )
+  message ( "OpenMP 4.0:            yes" )
+else ( HAVE_OPENMP )
+  message ( "OpenMP 4.0:            no" )
+endif ( HAVE_OPENMP )
+
 if ( ENABLE_DEBUG )
   message ( "Debug:                 yes" )
 else ( ENABLE_DEBUG )

src/config.cmake

@@ -76,6 +76,9 @@
 /* Define to 1 if you have the <netinet/tcp.h> header file. */
 #cmakedefine HAVE_NETINET_TCP_H @HAVE_NETINET_TCP_H@
 
+/* Define if compiling with openMP to enable parallel audio rendering */
+#cmakedefine HAVE_OPENMP @HAVE_OPENMP@
+
 /* Define to 1 if you have the <pthread.h> header file. */
 #cmakedefine HAVE_PTHREAD_H @HAVE_PTHREAD_H@
 

src/utils/fluidsynth_priv.h

@@ -102,6 +102,10 @@
 #include <pthread.h>
 #endif
 
+#if HAVE_OPENMP
+#include <omp.h>
+#endif
+
 #if HAVE_IO_H
 #include <io.h>
 #endif