Implement datum support and add make for ex-5.52

ex-5_50-52.scm

@@ -98,17 +98,21 @@
 
 (define c-preamble '(
   "#include <stdio.h>"
-  "#include \"scm_support.h\""
+  "#include <stdint.h>"
+  "#include <stdlib.h>"
+  ""
+  "#include \"datum.h\""
   ""
   "int main() {"
-  "    int val;"
-  "    int *argl;"
-  "    void *cont, *entry, *proc, *env;"
+  "    datum *val;"
+  "    datum *argl[10];"
+  "    datum *proc;"
+  "    void *cont, *entry, *env;"
   ""
   ))
 
 (define c-epilog '(
-  "    printf(\"%u\\n\", val);"
+  "    printf(\"%u\\n\", val->value);"
   "}"
   ))
 
@@ -133,7 +137,7 @@
      (display "]") (newline)
      (close-output-port port)))
 
-(compile-to-file "shared/scm2c/main.c" '(+ 1 1))
+(compile-to-file "shared/scm2c/main.c" '(+ 42 3))
 
 ; write assembly to file for debug purposes