krb5 commit: Ignore warnings in libev code

https://github.com/krb5/krb5/commit/52550a58846185fa07378ac38bca0d8c11d3134b
commit 52550a58846185fa07378ac38bca0d8c11d3134b
Author: Greg Hudson <[email protected]>
Date:   Sun Apr 16 00:54:36 2017 -0400

    Ignore warnings in libev code
    
    Add pragma statements to verto-k5ev.c to ignore warnings generated by
    the libev code in gcc and clang.

 src/util/verto/verto-k5ev.c |   12 ++++++++++++
 1 files changed, 12 insertions(+), 0 deletions(-)

diff --git a/src/util/verto/verto-k5ev.c b/src/util/verto/verto-k5ev.c
index 713c4f2..3f08275 100644
--- a/src/util/verto/verto-k5ev.c
+++ b/src/util/verto/verto-k5ev.c
@@ -36,6 +36,18 @@
 #include <verto.h>
 #include <verto-module.h>
 #include "rename.h"
+
+/* Ignore some warnings generated by the libev code, which the libev maintainer
+ * isn't interested in avoiding. */
+#ifdef __GNUC__
+#pragma GCC diagnostic ignored "-Wunused-value"
+#pragma GCC diagnostic ignored "-Wcomment"
+#pragma GCC diagnostic ignored "-Wunused-result"
+#ifdef __clang__
+#pragma GCC diagnostic ignored "-Wbitwise-op-parentheses"
+#endif
+#endif
+
 #define EV_API_STATIC 1
 #define EV_STANDALONE 1
 /* Avoid using clock_gettime, which would create a dependency on librt. */