Python 3.7 build (#381)

* Updated for Python 3.7.1

recipes/python3crystax/libffi/testsuite/libffi.call/struct1.c

@@ -0,0 +1,67 @@
+/* Area:	ffi_call
+   Purpose:	Check structures.
+   Limitations:	none.
+   PR:		none.
+   Originator:	From the original ffitest.c  */
+
+/* { dg-do run } */
+#include "ffitest.h"
+
+typedef struct
+{
+  unsigned char uc;
+  double d;
+  unsigned int ui;
+} test_structure_1;
+
+static test_structure_1 ABI_ATTR struct1(test_structure_1 ts)
+{
+  ts.uc++;
+  ts.d--;
+  ts.ui++;
+
+  return ts;
+}
+
+int main (void)
+{
+  ffi_cif cif;
+  ffi_type *args[MAX_ARGS];
+  void *values[MAX_ARGS];
+  ffi_type ts1_type;
+  ffi_type *ts1_type_elements[4];
+
+  test_structure_1 ts1_arg;
+
+  /* This is a hack to get a properly aligned result buffer */
+  test_structure_1 *ts1_result =
+    (test_structure_1 *) malloc (sizeof(test_structure_1));
+
+  ts1_type.size = 0;
+  ts1_type.alignment = 0;
+  ts1_type.type = FFI_TYPE_STRUCT;
+  ts1_type.elements = ts1_type_elements;
+  ts1_type_elements[0] = &ffi_type_uchar;
+  ts1_type_elements[1] = &ffi_type_double;
+  ts1_type_elements[2] = &ffi_type_uint;
+  ts1_type_elements[3] = NULL;
+  
+  args[0] = &ts1_type;
+  values[0] = &ts1_arg;
+  
+  /* Initialize the cif */
+  CHECK(ffi_prep_cif(&cif, ABI_NUM, 1,
+		     &ts1_type, args) == FFI_OK);
+  
+  ts1_arg.uc = '\x01';
+  ts1_arg.d = 3.14159;
+  ts1_arg.ui = 555;
+
+  ffi_call(&cif, FFI_FN(struct1), ts1_result, values);
+  
+  CHECK(ts1_result->ui == 556);
+  CHECK(ts1_result->d == 3.14159 - 1);
+ 
+  free (ts1_result);
+  exit(0);
+}