[PATCH 2/2] test/cbpf_filter: skip when openat2.h is not available

[Yang Xiuwei <yangxiuwei@kylinos.cn>]

cbpf_filter.c unconditionally includes <linux/openat2.h>, so the test
fails to build on systems whose kernel headers do not provide that
file (e.g. older distros or LTS). configure already sets
CONFIG_HAVE_OPEN_HOW=n and provides struct open_how in compat.h for
the library and other tests; only this test bypassed that by
including the kernel header directly.

Wrap the entire test in #ifdef CONFIG_HAVE_OPEN_HOW and add a stub
main that returns T_EXIT_SKIP in the #else branch. The test then
always compiles; on systems without openat2.h it skips at runtime.

Signed-off-by: Yang Xiuwei <yangxiuwei@kylinos.cn>
---
 test/cbpf_filter.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/test/cbpf_filter.c b/test/cbpf_filter.c
index 41fd284e..050b3ac7 100644
--- a/test/cbpf_filter.c
+++ b/test/cbpf_filter.c
@@ -6,6 +6,7 @@
  * Unlike eBPF which requires a separate compiled program, cBPF filters can
  * be defined inline as an array of sock_filter instructions.
  */
+#ifdef CONFIG_HAVE_OPEN_HOW
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -1443,3 +1444,10 @@ int main(int argc, char *argv[])
 
 	return total_failed;
 }
+#else /* #ifdef CONFIG_HAVE_OPEN_HOW */
+#include "helpers.h"
+int main(void)
+{
+	return T_EXIT_SKIP;
+}
+#endif /* #ifdef CONFIG_HAVE_OPEN_HOW */
-- 
2.25.1