bpo-29939: suppress compiler warnings in _ctypes_test (#1038)

vsajip · web-flow · commit d0d575a6db8c · 2017-04-07T23:23:08.000+01:00
bpo-29939: Changed test code to suppress a compiler warning, while taking care to avoid the code being optimized out by the compiler. (cherry picked from commit 164d30e)
diff --git a/Modules/_ctypes/_ctypes_test.c b/Modules/_ctypes/_ctypes_test.c
@@ -52,9 +52,9 @@ _testfunc_cbk_large_struct(Test in, void (*func)(Test))
 EXPORT(void)
 _testfunc_large_struct_update_value(Test in)
 {
-    in.first = 0x0badf00d;
-    in.second = 0x0badf00d;
-    in.third = 0x0badf00d;
+    ((volatile Test *)&in)->first = 0x0badf00d;
+    ((volatile Test *)&in)->second = 0x0badf00d;
+    ((volatile Test *)&in)->third = 0x0badf00d;
 }
 
 EXPORT(void)testfunc_array(int values[4])

Original file line number	Diff line number	Diff line change
`@@ -52,9 +52,9 @@ _testfunc_cbk_large_struct(Test in, void (*func)(Test))`
`52`	`52`	`EXPORT(void)`
`53`	`53`	`_testfunc_large_struct_update_value(Test in)`
`54`	`54`	`{`
`55`		`- in.first = 0x0badf00d;`
`56`		`- in.second = 0x0badf00d;`
`57`		`- in.third = 0x0badf00d;`
	`55`	`+ ((volatile Test *)&in)->first = 0x0badf00d;`
	`56`	`+ ((volatile Test *)&in)->second = 0x0badf00d;`
	`57`	`+ ((volatile Test *)&in)->third = 0x0badf00d;`
`58`	`58`	`}`
`59`	`59`
`60`	`60`	`EXPORT(void)testfunc_array(int values[4])`