[LTP] [PATCH v2] include/tst_timer: Add TST_NO_LIBLTP

[Cyril Hrubis]

Older compilers (gcc-4.8) are not smart enough to eliminate the
impossible branch with tst_brk() early enough and the sched_football
compilation fails due to the unresolved function.

Add TST_NO_LIBLTP macro that adds tst_brk_() inline implementaiont that
prints the message and calls abort() and make use of it in sched_football.

Cc: kernel-team@android.com
Cc: Darren Hart <darren@os.amperecomputing.com>
Cc: John Stultz <jstultz@google.com>
Signed-off-by: Cyril Hrubis <chrubis@suse.cz>
---
 include/tst_test.h                            | 23 +++++++++++++++++++
 .../func/sched_football/sched_football.c      |  1 +
 2 files changed, 24 insertions(+)

diff --git a/include/tst_test.h b/include/tst_test.h
index 8dc20d110..9bd1b363d 100644
--- a/include/tst_test.h
+++ b/include/tst_test.h
@@ -648,4 +648,27 @@ int main(int argc, char *argv[])
 #define TST_TEST_TCONF(message)                                 \
         static struct tst_test test = { .tconf_msg = message  } \
 
+/*
+ * Fallback for cases where we do not want to link against ltp library.
+ *
+ * This allows us for instance to use tst_timer.h without LTP library.
+ */
+#ifdef TST_NO_LIBLTP
+__attribute__ ((format (printf, 4, 5)))
+inline void tst_brk_(const char *file, const int lineno, int ttype,
+                     const char *fmt, ...)
+{
+	va_list va;
+
+	(void) ttype;
+
+	fprintf(stderr, "%s: %i: ", file, lineno);
+	va_start(va, fmt);
+	vfprintf(stderr, fmt, va);
+	va_end(va);
+
+	abort();
+}
+#endif
+
 #endif	/* TST_TEST_H__ */
diff --git a/testcases/realtime/func/sched_football/sched_football.c b/testcases/realtime/func/sched_football/sched_football.c
index b6ae692af..6846978f4 100644
--- a/testcases/realtime/func/sched_football/sched_football.c
+++ b/testcases/realtime/func/sched_football/sched_football.c
@@ -74,6 +74,7 @@
 #include <librttest.h>
 #include <tst_atomic.h>
 #define TST_NO_DEFAULT_MAIN
+#define TST_NO_LIBLTP
 #include <tst_timer.h>
 
 
-- 
2.44.2