avoid warnings about initialization of automatic aggregates

* src/system.h (DZA_CONCAT0, DZA_CONCAT): New macros.
(DECLARE_ZEROED_AGGREGATE): New macro.
* src/ls.c (quote_name): Use it.
* src/pathchk.c (portable_chars_only): Use it.
* src/shred.c (main): Use it.
* src/stty.c (main): Use it.
* src/wc.c (SUPPORT_OLD_MBRTOWC): Use it.

1 files changed, 13 insertions, 0 deletions

diff --git a/src/system.h b/src/system.h
index d51caedf1..21182a47f 100644
--- a/src/system.h
+++ b/src/system.h
@@ -513,6 +513,19 @@ enum
 # define IF_LINT(Code) /* empty */
 #endif
 
+/* With -Dlint, avoid warnings from gcc about code like mbstate_t m = {0,};
+   by wasting space on a static variable of the same type, that is thus
+   guaranteed to be initialized to 0, and use that on the RHS.  */
+#define DZA_CONCAT0(x,y) x ## y
+#define DZA_CONCAT(x,y) DZA_CONCAT0 (x, y)
+#ifdef lint
+# define DECLARE_ZEROED_AGGREGATE(Type, Var) \
+   static Type DZA_CONCAT (s0_, __LINE__); Type Var = DZA_CONCAT (s0_, __LINE__)
+#else
+# define DECLARE_ZEROED_AGGREGATE(Type, Var) \
+  Type Var = { 0, }
+#endif
+
 #ifndef __attribute__
 # if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 8)
 #  define __attribute__(x) /* empty */