include/closestream: add close_stdout_atexit()

It seems better to have a way to control when atexit(close_stdout()) is
used, because close stdout means that for example ASAN (or another
into binary integrated tool) is not able to print the final summary.

Signed-off-by: Karel Zak <kzak@redhat.com>

configure.ac

@@ -156,6 +156,8 @@ AC_ARG_ENABLE([asan],
 AS_IF([test "x$enable_asan" = xyes], [
   UL_WARN_ADD([-fsanitize=address])
   ASAN_LDFLAGS="-fsanitize=address"
+],[
+  AC_DEFINE([USE_CLOSE_ATEXIT], [1], [close stdout at exit])
 ])
 
 AC_SUBST([ASAN_LDFLAGS])

include/closestream.h

@@ -51,6 +51,17 @@ close_stdout(void)
 		_exit(CLOSE_EXIT_CODE);
 }
 
+static inline void
+close_stdout_atexit(void)
+{
+	/*
+	 * Note that close stdout at exit disables ASAN to report memory leaks
+	 */
+#ifdef USE_CLOSE_ATEXIT
+	atexit(close_stdout);
+#endif
+}
+
 #ifndef HAVE_FSYNC
 static inline int
 fsync(int fd __attribute__((__unused__)))