[sound-juicer] Add SJ_BEGIN/END_IGNORE_SWITCH_ENUM

[Phillip Wood <pwood src gnome org>]

commit 96f8999246ae291b1cb25b380a8a19b86132d522
Author: Phillip Wood <phillip wood dunelm org uk>
Date:   Thu Nov 10 11:14:48 2016 +0000

    Add SJ_BEGIN/END_IGNORE_SWITCH_ENUM
    
    These provide a simple way to disable -Wswitch-enum warnings where they
    are unhelpful.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=777692
    
    squash! Add SJ_BEGIN/END_IGNORE_SWITCH_ENUM

 libjuicer/sj-util.h |   12 ++++++++++++
 1 files changed, 12 insertions(+), 0 deletions(-)
---
diff --git a/libjuicer/sj-util.h b/libjuicer/sj-util.h
index ec28518..f365981 100644
--- a/libjuicer/sj-util.h
+++ b/libjuicer/sj-util.h
@@ -51,4 +51,16 @@ gboolean sj_str_is_empty (const char *s);
 #define SJ_END_IGNORE_DISCARDED_QUANTIFIERS
 #endif
 
+#if G_GNUC_CHECK_VERSION (4,2)
+#define SJ_BEGIN_IGNORE_SWITCH_ENUM                                             \
+  _Pragma ("GCC diagnostic push")                                               \
+  _Pragma ("GCC diagnostic ignored \"-Wswitch-enum\"")
+
+#define SJ_END_IGNORE_SWITCH_ENUM                                               \
+  _Pragma ("GCC diagnostic pop")
+#else
+#define SJ_BEGIN_IGNORE_SWITCH_ENUM
+#define SJ_END_IGNORE_SWITCH_ENUM
+#endif
+
 #endif /* SJ_UTIL_H */