make Math module optional

include/mrbconf.h

@@ -20,21 +20,24 @@ typedef double mrb_float;
 typedef int mrb_int;
 typedef intptr_t mrb_sym;
 
-#undef  PARSER_DUMP        /* do not print out parser state */
 //#define PARSER_DUMP        /* print out parser state */
+#undef  PARSER_DUMP        /* do not print out parser state */
 
-#undef  INCLUDE_ENCODING   /* not use encoding classes (ascii only) */
 //#define INCLUDE_ENCODING   /* use UTF-8 encoding classes */
+#undef  INCLUDE_ENCODING   /* not use encoding classes (ascii only) */
 
-#undef  INCLUDE_REGEXP     /* not use regular expression classes */
 //#define INCLUDE_REGEXP     /* use regular expression classes */
+#undef  INCLUDE_REGEXP     /* not use regular expression classes */
 
 #ifdef  INCLUDE_REGEXP
 # define INCLUDE_ENCODING  /* Regexp depends Encoding */
 #endif
 
-//#undef INCLUDE_KERNEL_SPRINTF     /* not use Kernel.sprintf method. */
-#define INCLUDE_KERNEL_SPRINTF     /* not use Kernel.sprintf method. */
+#define INCLUDE_KERNEL_SPRINTF     /* not use Kernel.sprintf method */
+//#undef INCLUDE_KERNEL_SPRINTF     /* not use Kernel.sprintf method */
+
+#define INCLUDE_MATH	/* use (non ISO) Math module */
+//#undef INCLUDE_MATH     /* not use (non ISO) Math module */
 
 #ifdef  MRUBY_DEBUG_BUILD
 # define PARSER_DUMP

src/init.c

@@ -57,7 +57,9 @@ mrb_init_core(mrb_state *mrb)
   mrb_init_exception(mrb);
   mrb_init_print(mrb);
   mrb_init_time(mrb);
+#ifdef INCLUDE_MATH
   mrb_init_math(mrb);
+#endif
 
   mrb_init_mrblib(mrb);
 

src/math.c

@@ -5,6 +5,8 @@
 */
 
 #include "mruby.h"
+
+#ifdef INCLUDE_MATH
 #include <math.h>
 
 #define domain_error(msg) \
@@ -679,3 +681,4 @@ mrb_init_math(mrb_state *mrb)
   mrb_define_module_function(mrb, mrb_math, "erf",  math_erf,  ARGS_REQ(1));
   mrb_define_module_function(mrb, mrb_math, "erfc", math_erfc, ARGS_REQ(1));
 }
+#endif	/* INCLUDE_MATH */