3 files changed, 23 insertions, 1 deletions
diff --git a/volk/gen/archs.xml b/volk/gen/archs.xml
index f6822871f..960558b7c 100644
--- a/volk/gen/archs.xml
+++ b/volk/gen/archs.xml
@@ -29,6 +29,7 @@
   <val>1</val>
   <overrule>MD_SUBCPU</overrule>
   <overrule_val>x86</overrule_val>
+  <mutex>32</mutex>
 </arch>
 
 <arch name="3dnow" type="x86">
diff --git a/volk/gen/volk_register.py b/volk/gen/volk_register.py
index 75e5eeb87..f5854bbce 100644
--- a/volk/gen/volk_register.py
+++ b/volk/gen/volk_register.py
@@ -91,7 +91,7 @@ for arch in archs:
     if a_var:
         archs.remove(arch);
         
-        
+#strip out mutex archs        
 
 archflags_dict = {}
 for filearch in filearchs:
diff --git a/volk/lib/CMakeLists.txt b/volk/lib/CMakeLists.txt
index d69b4941d..b332ea5a3 100644
--- a/volk/lib/CMakeLists.txt
+++ b/volk/lib/CMakeLists.txt
@@ -27,6 +27,14 @@ EXECUTE_PROCESS(
     OUTPUT_VARIABLE arch_lines OUTPUT_STRIP_TRAILING_WHITESPACE
 )
 
+#get any mutually exclusive archs so we can exclude them
+#this is really for compilers which can do both 32- and 64-bit compilations.
+EXECUTE_PROCESS(
+    COMMAND ${PYTHON_EXECUTABLE} -c
+    "from xml.dom import minidom; print ';'.join(map(lambda a: '%s %s'%(a.parentNode.attributes['name'].value,a.firstChild.data),minidom.parse('../gen/archs.xml').getElementsByTagName('mutex')))"
+    OUTPUT_VARIABLE mutex_lines OUTPUT_STRIP_TRAILING_WHITESPACE
+)
+
 #This macro sets the ${arch}_flag variable,
 #and handles special cases for MSVC arch flags.
 MACRO(set_arch_flag name flag)
@@ -59,12 +67,25 @@ MACRO(handle_arch name flag)
     ENDIF()
 ENDMACRO(handle_arch)
 
+MACRO(remove_mutex name mutex)
+    IF(have_${name})
+        UNSET(have_${mutex})
+    ENDIF()
+    LIST(REMOVE_ITEM available_arches ${mutex})
+ENDMACRO(remove_mutex)
+
 #create a list of available arches
 FOREACH(arch_line ${arch_lines})
     SEPARATE_ARGUMENTS(args UNIX_COMMAND "${arch_line}")
     handle_arch(${args})
 ENDFOREACH(arch_line)
 
+#strip out mutex archs
+FOREACH(mutex_line ${mutex_lines})
+    SEPARATE_ARGUMENTS(args UNIX_COMMAND "${mutex_line}")
+    remove_mutex(${args})
+ENDFOREACH(mutex_line)
+
 MESSAGE(STATUS "Available arches: ${available_arches}")
 
 ########################################################################