[tests] update custom machdep test and test json loading

tests/misc/custom_machdep.c

@@ -4,6 +4,9 @@
  DEPS: @PTEST_NAME@/__fc_machdep_custom.h
    OPT: -cpp-extra-args="-I./@PTEST_NAME@ -D__FC_MACHDEP_CUSTOM" -machdep custom -print -then -print
   COMMENT: we need a -then to test double registering of a machdep
+ EXIT: 0
+ DEPS: @PTEST_NAME@/__fc_machdep_custom.h
+   OPT: -cpp-extra-args="-I./@PTEST_NAME@ -D__FC_MACHDEP_CUSTOM" -machdep %{dep:@PTEST_DIR@/@PTEST_NAME@.json} -print
 */
 #include "__fc_machdep_custom.h"
 // most of the following includes are not directly used, but they test if

tests/misc/custom_machdep.json

+ {
+     "version": "foo",
+     "compiler": "bar",
+     "cpp_arch_flags" : [],
+     "sizeof_short" : 2,
+     "sizeof_int": 3,
+     "sizeof_long": 4,
+     "sizeof_longlong" : 8,
+     "sizeof_ptr" : 4,
+     "sizeof_float": 4,
+     "sizeof_double": 8,
+     "sizeof_longdouble": 12,
+     "sizeof_void": 1,
+     "sizeof_fun" : 1,
+     "size_t" : "unsigned long",
+     "wchar_t" : "int",
+     "ptrdiff_t": "int",
+     "alignof_short" : 2,
+     "alignof_int": 3,
+     "alignof_long": 4,
+     "alignof_longlong": 4,
+     "alignof_ptr" : 4,
+     "alignof_float": 4,
+     "alignof_double": 4,
+     "alignof_longdouble": 4,
+     "alignof_str": 1,
+     "alignof_fun": 1,
+     "alignof_aligned": 16,
+     "char_is_unsigned": false,
+     "little_endian": true,
+     "has__builtin_va_list": true
+  }

tests/misc/custom_machdep.ml

@@ -30,9 +30,7 @@ let mach =
     alignof_fun = 1;
     alignof_aligned= 16;
     char_is_unsigned = false;
-    const_string_literals = true;
     little_endian = true;
-    underscore_name = false ;
     has__builtin_va_list = true;
   }
 

tests/misc/oracle/custom_machdep.1.res.oracle

+[kernel] Registering machdep 'mach' as 'custom'
+[kernel] Parsing custom_machdep.c (with preprocessing)
+/* Generated by Frama-C */
+#include "ctype.h"
+#include "errno.h"
+#include "inttypes.h"
+#include "locale.h"
+#include "math.h"
+#include "signal.h"
+#include "stdarg.h"
+#include "stddef.h"
+#include "stdint.h"
+#include "stdio.h"
+#include "stdlib.h"
+#include "string.h"
+#include "strings.h"
+#include "time.h"
+#include "wchar.h"
+int main(void)
+{
+  int __retres;
+  __retres = (int)2147483647;
+  return __retres;
+}
+
+