PATCH: silencing compiler warnings from gcc 4

[Wayne Davison <wayned@xxxxxxxxxxxxxxxxxxxxx>]

Gcc 4 outputs a bunch of compiler warnings about string pointers that
differ in signedness.  The warnings in a zsh build are limited to the
zle string functions defined in zle.h.  I came up with 2 solutions:
(1) change the ZS_str* macros to cast their args to (char*), or (2)
introduce some static inline functions to handle the casts.  The
advantage of the latter is that it doesn't hide pointer-conversion
errors behind forced casts.  For instance, after I compiled the inline
version it showed several places in the code that were using ZWC() on
strings instead of ZWS() (which I already fixed and checked in).

As for the portability of "inline", there is an autoconf macro that I
included, AC_C_INLINE, that redefines the word "inline" as appropriate.
The rsync package used a static inline function in its rsync.h for many
years (thought I eliminated it recently), so it would seem to be quite
portable.

Comments?

..wayne..

--- configure.ac	1 Aug 2005 09:54:56 -0000	1.37
+++ configure.ac	11 Aug 2005 18:42:00 -0000
@@ -437,6 +437,7 @@ AC_SUBST(LIBLDFLAGS)dnl
 AC_PROG_CPP                 dnl Figure out how to run C preprocessor.
 AC_PROG_GCC_TRADITIONAL     dnl Do we need -traditional flag for gcc.
 AC_C_CONST                  dnl Does compiler support `const'.
+AC_C_INLINE
 
 dnl Default preprocessing on Mac OS X produces warnings
 case "$host_os" in
--- Src/Zle/zle.h	10 Aug 2005 10:56:41 -0000	1.15
+++ Src/Zle/zle.h	11 Aug 2005 18:42:00 -0000
@@ -89,10 +89,20 @@ typedef int ZLE_INT_T;
 #define ZS_memmove memmove
 #define ZS_memset memset
 #define ZS_memcmp memcmp
-#define ZS_strlen strlen
-#define ZS_strcpy strcpy
-#define ZS_strncpy strncpy
-#define ZS_strncmp strncmp
+
+static inline size_t ZS_strlen(ZLE_STRING_T s);
+static inline ZLE_STRING_T ZS_strcpy(ZLE_STRING_T t, ZLE_STRING_T f);
+static inline ZLE_STRING_T ZS_strncpy(ZLE_STRING_T t, ZLE_STRING_T f, size_t l);
+static inline int ZS_strncmp(ZLE_STRING_T s1, ZLE_STRING_T s2, size_t l);
+
+static inline size_t ZS_strlen(ZLE_STRING_T s)
+{ return strlen((char*)s); }
+static inline ZLE_STRING_T ZS_strcpy(ZLE_STRING_T t, ZLE_STRING_T f)
+{ return (ZLE_STRING_T)strcpy((char*)t, (char*)f); }
+static inline ZLE_STRING_T ZS_strncpy(ZLE_STRING_T t, ZLE_STRING_T f, size_t l)
+{ return (ZLE_STRING_T)strncpy((char*)t, (char*)f, l); }
+static inline int ZS_strncmp(ZLE_STRING_T s1, ZLE_STRING_T s2, size_t l)
+{ return strncmp((char*)s1, (char*)s2, l); }
 
 #define ZC_iblank iblank
 #define ZC_icntrl icntrl

--- Src/Zle/zle.h	10 Aug 2005 10:56:41 -0000	1.15
+++ Src/Zle/zle.h	11 Aug 2005 18:20:16 -0000
@@ -89,10 +89,10 @@ typedef int ZLE_INT_T;
 #define ZS_memmove memmove
 #define ZS_memset memset
 #define ZS_memcmp memcmp
-#define ZS_strlen strlen
-#define ZS_strcpy strcpy
-#define ZS_strncpy strncpy
-#define ZS_strncmp strncmp
+#define ZS_strlen(s) strlen((char*)(s))
+#define ZS_strcpy(t,f) strcpy((char*)(t),(char*)(f))
+#define ZS_strncpy(t,f,l) strncpy((char*)(t),(char*)(f),(l))
+#define ZS_strncmp(s1,s2,l) strncmp((char*)(s1),(char*)(s2),(l))
 
 #define ZC_iblank iblank
 #define ZC_icntrl icntrl