[PATCH] test-suite: new preprocessor test case

[Hannes Eder <hannes@hanneseder.net>]

Sparse currently fails on this test.

Signed-off-by: Hannes Eder <hannes@hanneseder.net>
---

I discovered this while hunting down the sparse segfault when checking kernel/cred.c.

When preprocessing the file with gcc, gcc remains silent, but sparse
complains:

include/linux/skbuff.h:381:9: error: expected preprocessor identifier
include/linux/skbuff.h:381:9: error: expected preprocessor identifier
include/linux/skbuff.h:381:9: error: garbage at end: )
include/linux/skbuff.h:381:9: error: expected preprocessor identifier
include/linux/skbuff.h:381:9: error: expected preprocessor identifier
include/linux/skbuff.h:381:9: error: garbage at end: )

this is covered by the test case in a more abstract form.  Sparse
further complains about this, which is not yet covered in a test case:

kernel/cred.c:281:9: error: unmatched #endif in stream
kernel/cred.c:281:9: error: unmatched #endif in stream
kernel/cred.c:281:9: error: unmatched #endif in stream

 validation/preprocessor/preprocessor22.c |   21 +++++++++++++++++++++
 1 files changed, 21 insertions(+), 0 deletions(-)
 create mode 100644 validation/preprocessor/preprocessor22.c

diff --git a/validation/preprocessor/preprocessor22.c b/validation/preprocessor/preprocessor22.c
new file mode 100644
index 0000000..838479f
--- /dev/null
+++ b/validation/preprocessor/preprocessor22.c
@@ -0,0 +1,21 @@
+#define CONFIG_FOO 1
+
+#define define_struct(name, fields...) struct fields name;
+
+define_struct(a, {
+#ifdef CONFIG_FOO
+  int b;
+#endif
+});
+/*
+ * check-name: Preprocessor #22
+ * check-description: Sparse gets this wrong, should be fixed
+ * check-command: sparse -E $file
+ * check-known-to-fail
+ *
+ * check-output-start
+
+struct {
+int b; } a;;
+ * check-output-end
+ */