added makefile variable OPENMP to enable usage of OpenMP (includes vconv support of -fopenmp) [Oliver Stöneberg]

makefile

@@ -268,6 +268,9 @@ BUILD_MIDILIB = 1
 # uncomment to enable SSE2 optimized code and SSE2 code generation (implicitly enabled by 64-bit compilers)
 # SSE2 = 1
 
+# uncomment to enable OpenMP optimized code
+# OPENMP = 1
+
 # specify optimization level or leave commented to use the default
 # (default is OPTIMIZE = 3 normally, or OPTIMIZE = 0 with symbols)
 # OPTIMIZE = 3
@@ -548,6 +551,13 @@ ifdef SSE2
 CCOMFLAGS += -msse2
 endif
 
+ifdef OPENMP
+DEFS += -DHAS_OPENMP
+CCOMFLAGS += -fopenmp
+else
+CCOMFLAGS += -Wno-unknown-pragmas
+endif
+
 # add a basic set of warnings
 CCOMFLAGS += \
 	-Wall \

src/osd/windows/vconv.c

@@ -99,6 +99,7 @@ static const translation_info gcc_translate[] =
 	{ 0,        "c++",                      "" },
 	{ 0,        "-flto",                    "/GL" },
 	{ 0,        "-fno-optimize-sibling-calls", "" },
+	{ VS2005,   "-fopenmp", 					"/openmp" },
 	{ 0 }
 };