Pulled in libffi from gcc trunk.

Fixed build and install for standalone use.

libffi/testsuite/libffi.special/unwindtest_ffi_call.cc

@@ -0,0 +1,53 @@
+/* Area:	ffi_call, unwind info
+   Purpose:	Check if the unwind information is passed correctly.
+   Limitations:	none.
+   PR:		none.
+   Originator:	Andreas Tobler <andreast@gcc.gnu.org> 20061213  */
+
+/* { dg-do run { xfail mips64*-*-* arm*-*-* strongarm*-*-* xscale*-*-* } } */
+#include "ffitestcxx.h"
+
+static int checking(int a __UNUSED__, short b __UNUSED__,
+		    signed char c __UNUSED__)
+{
+  throw 9;
+}
+
+int main (void)
+{
+  ffi_cif cif;
+  ffi_type *args[MAX_ARGS];
+  void *values[MAX_ARGS];
+  ffi_arg rint;
+
+  signed int si;
+  signed short ss;
+  signed char sc;
+
+  args[0] = &ffi_type_sint;
+  values[0] = &si;
+  args[1] = &ffi_type_sshort;
+  values[1] = &ss;
+  args[2] = &ffi_type_schar;
+  values[2] = &sc;
+
+  /* Initialize the cif */
+  CHECK(ffi_prep_cif(&cif, FFI_DEFAULT_ABI, 3,
+		     &ffi_type_sint, args) == FFI_OK);
+
+  si = -6;
+  ss = -12;
+  sc = -1;
+  {
+    try
+      {
+	ffi_call(&cif, FFI_FN(checking), &rint, values);
+      } catch (int exception_code)
+      {
+	CHECK(exception_code == 9);
+      }
+    printf("part one OK\n");
+    /* { dg-output "part one OK" } */
+  }
+  exit(0);
+}