This is a fix for 2 things: a problem Terry was having in OSX with null pointers, which was my fault, as I probably forgot to run the sed script last time I made mods. So, I moved the fix into the flex input itself. Then, I found when I used flex 2.5.33, that it was using __STDC_VERSION__, and that's not real good; so I added back in a DIFFERENT sed script to fix that little mess. Tested everything, a couple different ways. Hope I did no harm, at the least.

git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@97849 65c4cc65-6c06-0410-ace0-fbb531ad65f3

main/Makefile

@@ -105,8 +105,8 @@ ast_expr2.c ast_expr2.h:
 	bison -o $@ -d --name-prefix=ast_yy ast_expr2.y
 
 ast_expr2f.c:
-	flex -o $@ --full ast_expr2.fl
-	sed 's@free( (char \*) ptr );@if(ptr) free( (char *) ptr );@' ast_expr2f.c > zz
+	flex -o $@ --full ast_expr2.fl # moved the correction of yyfree into the flex input file itself.
+	sed 's@#if __STDC_VERSION__ >= 199901L@#if !defined __STDC_VERSION__ || __STDC_VERSION__ >= 199901L@' ast_expr2f.c > zz
 	mv zz ast_expr2f.c
 
 testexpr2: ast_expr2f.c ast_expr2.c ast_expr2.h

main/ast_expr2.fl

@@ -99,6 +99,7 @@ static char *expr2_token_subst(const char *mess);
 %option bison-bridge
 %option bison-locations
 %option noyywrap
+%option noyyfree
 %x var trail
 
 %%
@@ -213,6 +214,14 @@ static char *expr2_token_subst(const char *mess);
 int ast_yyparse(void *); /* need to/should define this prototype for the call to yyparse */
 int ast_yyerror(const char *, YYLTYPE *, struct parse_io *); /* likewise */
 
+void ast_yyfree(void *ptr, yyscan_t yyscanner)
+{
+      if (ptr) /* the normal generated yyfree func just frees its first arg;
+                    this get complaints on some systems, as sometimes this
+                    arg is a nil ptr! It's usually not fatal, but is irritating! */
+              free( (char *) ptr );
+}
+
 int ast_expr(char *expr, char *buf, int length)
 {
 	struct parse_io io;