Allow field opt-in

Building with -DDISABLE_DEFAULT_FIELDS disables all fields, allowing only the
desired ones to be enabled with -DDENABLE_FIELD_FOO.

If a field is explicitly enabled and disabled, disable takes precedence.

Author: theuni

doc/gen_params.sage

@@ -315,14 +315,14 @@ def print_result(bits, style):
         assert(False)
 
 for bits in range(2, 65):
-    print("#ifndef DISABLE_FIELD_%i" % bits)
+    print("#ifdef ENABLE_FIELD_INT_%i" % bits)
     print("// %i bit field" % bits)
     print_result(bits, INT)
     print("#endif")
     print("")
 
 for bits in range(2, 65):
-    print("#ifndef DISABLE_FIELD_%i" % bits)
+    print("#ifdef ENABLE_FIELD_INT_%i" % bits)
     print("// %i bit field" % bits)
     print_result(bits, CLMUL)
     print_result(bits, CLMUL_TRI)

sources.mk

@@ -13,6 +13,7 @@ MINISKETCH_DIST_HEADERS_INT += %reldir%/include/minisketch.h
 
 MINISKETCH_LIB_HEADERS_INT =
 MINISKETCH_LIB_HEADERS_INT += %reldir%/src/false_positives.h
+MINISKETCH_LIB_HEADERS_INT += %reldir%/src/fielddefines.h
 MINISKETCH_LIB_HEADERS_INT += %reldir%/src/int_utils.h
 MINISKETCH_LIB_HEADERS_INT += %reldir%/src/lintrans.h
 MINISKETCH_LIB_HEADERS_INT += %reldir%/src/sketch.h