# HG changeset patch
# Parent  e3757f3e18480a406b7af53435ed99fd6c4774a4
Issue #27643: Disable signed short bitfield test with IBM XLC compiler

diff -r e3757f3e1848 Lib/ctypes/test/test_bitfields.py
--- a/Lib/ctypes/test/test_bitfields.py	Fri Jul 29 05:52:32 2016 +0000
+++ b/Lib/ctypes/test/test_bitfields.py	Thu Aug 04 08:54:46 2016 +0000
@@ -41,6 +41,9 @@
                 self.assertEqual((name, i, getattr(b, name)), (name, i, func(byref(b), name)))
 
     def test_shorts(self):
+        b = BITS()
+        if func(byref(b), "M") == 999:
+            self.skipTest("Compiler does not support signed short bitfields")
         for i in range(256):
             for name in "MNOPQRS":
                 b = BITS()
diff -r e3757f3e1848 Modules/_ctypes/_ctypes_test.c
--- a/Modules/_ctypes/_ctypes_test.c	Fri Jul 29 05:52:32 2016 +0000
+++ b/Modules/_ctypes/_ctypes_test.c	Thu Aug 04 08:54:46 2016 +0000
@@ -378,8 +378,13 @@
 EXPORT(unsigned PY_LONG_LONG) last_tf_arg_u;
 
 struct BITS {
-    int A: 1, B:2, C:3, D:4, E: 5, F: 6, G: 7, H: 8, I: 9;
+    signed int A: 1, B:2, C:3, D:4, E: 5, F: 6, G: 7, H: 8, I: 9;
+/* The test case needs "signed short" bitfields, but the IBM XLC compiler
+does not support this */
+#ifndef /* Something to identify XLC */
+# define SIGNED_SHORT_BITFIELDS
     short M: 1, N: 2, O: 3, P: 4, Q: 5, R: 6, S: 7;
+#endif
 };
 
 DL_EXPORT(void) set_bitfields(struct BITS *bits, char name, int value)
@@ -394,7 +399,7 @@
     case 'G': bits->G = value; break;
     case 'H': bits->H = value; break;
     case 'I': bits->I = value; break;
-
+#ifdef SIGNED_SHORT_BITFIELDS
     case 'M': bits->M = value; break;
     case 'N': bits->N = value; break;
     case 'O': bits->O = value; break;
@@ -402,6 +407,7 @@
     case 'Q': bits->Q = value; break;
     case 'R': bits->R = value; break;
     case 'S': bits->S = value; break;
+#endif
     }
 }
 
@@ -417,7 +423,7 @@
     case 'G': return bits->G;
     case 'H': return bits->H;
     case 'I': return bits->I;
-
+#ifdef SIGNED_SHORT_BITFIELDS
     case 'M': return bits->M;
     case 'N': return bits->N;
     case 'O': return bits->O;
@@ -425,8 +431,9 @@
     case 'Q': return bits->Q;
     case 'R': return bits->R;
     case 'S': return bits->S;
+#endif
     }
-    return 0;
+    return 999;
 }
 
 static PyMethodDef module_methods[] = {