Throughout, run newlib with -Wall -Werror option and fix bugs and

	compiler warnings found this way.

	* libc/stdio/freopen.c (_freopen_r): Fix bug setting _flags.

	* libc/include/stdio.h (_rename): Define when building newlib.
	* libc/include/sys/signal.h (_kill): Ditto.
	* libc/include/sys/stat.h (_mkdir): Ditto.
	* libc/include/sys/time.h (_gettimeofday): Ditto.
	* libc/include/sys/times.h (_times): Ditto.
	* libc/include/sys/wait.h (_wait): Ditto.
	* libc/locale/lmessages.c (empty): Don't define for Cygwin.
	* libc/locale/lmonetary.c (cnv): Ditto.
	* libc/locale/nl_langinfo.c (nl_langinfo): Ditto for variable s.
	* libc/posix/collate.c: Throughout cast to avoid compiler warning.
	* libc/posix/engine.c (matcher): Initialize dp to avoid compiler
	warning.
	* libc/posix/glob.c: Disable on Cygwin.  Explain why.
	* libc/posix/regcomp.c: Fix "uninitialized" compiler warnings.
	(dissect): Deliberately silence gcc compiler warning.  Add comment to
	explain why.
	* libc/posix/wordexp.c (wordexp): Remove num_bytes variable since result
	is never used.
	* libc/posix/popen.c (popen): Ditto for variable last.
	* libc/reent/mkdirr.c: Include sys/stat.h.
	* libc/reent/renamer.c: Include stdio.h.
	* libc/search/hash.c:  Throughout use underscored variants of the stat
	function family.
	(init_hash): Add missing definition for the __USE_INTERNAL_STAT64 case.
	* libc/search/hash_bigkey.c (__big_insert): Add parenthesis to avoid
	compiler warning.
	* libc/search/hash_page.c (overflow_page): Initalize freep to NULL to
	avoid compiler warning.
	* libc/stdio/asiprintf.c (_asiprintf_r): Cast unsigned char * to char *
	to avoid compiler warning.
	(asiprintf): Ditto.
	* libc/stdio/asprintf.c (_asprintf_r): Ditto.
	(asprintf): Ditto.
	* libc/stdio/vasiprintf.c (_vasiprintf_r): Ditto.
	* libc/stdio/vasprintf.c (_vasprintf_r): Ditto.
	* libc/stdio/mktemp.c (_gettemp): Cast to unsigned char in call to
	isdigit to avoid compiler warning.
	* libc/stdio/vfprintf.c (_VFPRINTF_R): Initialize variables used for
	grouping to avoid compiler warning.  Only define and set nseps and
	nrepeats if they are really used.
	* libc/stdio/vfwprintf.c (_VFWPRINTF_R): Ditto.  Only define state if
	it is really used.
	* libc/stdio/vfscanf.c (u_char): Revert to be defined as unsigned char.
	(__SVFSCANF_R): Cast fmt in call to __mbtowc.
	* libc/stdlib/mbtowc_r.c (JIS_state_table): Disable when building
	Cygwin.
	(JIS_action_table): Ditto.
	* libc/stdlib/wctomb_r.c (__utf8_wctomb): Add parenthesis to avoid
	compiler warning.
	* libc/string/strcasestr.c: Deliberately silence gcc compiler warning.
	Add comment to explain why.
	* libc/time/strptime.c (strptime): Cast to unsigned char in calls to
	isspace to avoid compiler warning.
	* libm/math/e_atan2.c (__ieee754_atan2): Add parenthesis to avoid
	compiler warning.
	* libm/math/e_exp.c (__ieee754_exp): Initialize k to 0 to avoid
	compiler warning.  Drop setting it to 0 later.
	* libm/math/ef_exp.c (__ieee754_expf): Ditto.
	* libm/math/e_pow.c (__ieee754_pow): Add braces to avoid compiler
	warning.
	* libm/math/ef_pow.c (__ieee754_powf): Ditto.
	* libm/math/er_lgamma.c (__ieee754_lgamma_r): Initialize nadj to 0 to
	avoid compiler warning.
	* libm/math/erf_lgamma.c (__ieee754_lgammaf_r): Ditto.
	* libm/math/e_rem_pio2.c (__ieee754_rem_pio2): Ditto for variable z.
	* libm/common/sf_round.c (roundf): Remove signbit variable since result
	is never used.

6 files changed, 31 insertions, 25 deletions

diff --git a/newlib/libc/posix/collate.c b/newlib/libc/posix/collate.c
index 6ee455001..8bb04ef0d 100644
--- a/newlib/libc/posix/collate.c
+++ b/newlib/libc/posix/collate.c
@@ -117,24 +117,26 @@ __collate_substitute(s)
 	const u_char *s;
 {
 	int dest_len, len, nlen;
-	int delta = strlen(s);
+	int delta = strlen((const char *) s);
 	u_char *dest_str = NULL;
 
 	if(s == NULL || *s == '\0')
-		return __collate_strdup("");
+		return __collate_strdup((u_char *) "");
 	delta += delta / 8;
-	dest_str = malloc(dest_len = delta);
+	dest_str = (u_char *) malloc(dest_len = delta);
 	if(dest_str == NULL)
 		__collate_err(EX_OSERR, __FUNCTION__);
 	len = 0;
 	while(*s) {
-		nlen = len + strlen(__collate_substitute_table[*s]);
+		nlen = len + strlen((const char *)
+				    __collate_substitute_table[*s]);
 		if (dest_len <= nlen) {
 			dest_str = reallocf(dest_str, dest_len = nlen + delta);
 			if(dest_str == NULL)
 				__collate_err(EX_OSERR, __FUNCTION__);
 		}
-		strcpy(dest_str + len, __collate_substitute_table[*s++]);
+		strcpy((char *) dest_str + len,
+		       (const char *) __collate_substitute_table[*s++]);
 		len = nlen;
 	}
 	return dest_str;
@@ -150,8 +152,9 @@ __collate_lookup(t, len, prim, sec)
 	*len = 1;
 	*prim = *sec = 0;
 	for(p2 = __collate_chain_pri_table; p2->str[0]; p2++) {
-		if(strncmp(t, p2->str, strlen(p2->str)) == 0) {
-			*len = strlen(p2->str);
+		if(strncmp((const char *) t, (const char *) p2->str,
+			   strlen((const char *) p2->str)) == 0) {
+			*len = strlen((const char *) p2->str);
 			*prim = p2->prim;
 			*sec = p2->sec;
 			return;
@@ -165,7 +168,7 @@ u_char *
 __collate_strdup(s)
 	u_char *s;
 {
-	u_char *t = strdup(s);
+	u_char *t = (u_char *) strdup((const char *) s);
 
 	if (t == NULL)
 		__collate_err(EX_OSERR, __FUNCTION__);
diff --git a/newlib/libc/posix/engine.c b/newlib/libc/posix/engine.c
index 8494b90a9..5956e2747 100644
--- a/newlib/libc/posix/engine.c
+++ b/newlib/libc/posix/engine.c
@@ -145,7 +145,7 @@ int eflags;
 	int i;
 	struct match mv;
 	struct match *m = &mv;
-	char *dp;
+	char *dp = NULL;
 	const sopno gf = g->firststate+1;	/* +1 for OEND */
 	const sopno gl = g->laststate;
 	char *start;
@@ -181,8 +181,8 @@ int eflags;
 			pp = mustlast;
 			for (dp = start+g->mlen-1; dp < stop;) {
 				/* Fast skip non-matches */
-				while (dp < stop && charjump[*dp])
-					dp += charjump[*dp];
+				while (dp < stop && charjump[(unsigned char) *dp])
+					dp += charjump[(unsigned char) *dp];
 
 				if (dp >= stop)
 					break;
@@ -198,7 +198,7 @@ int eflags;
 
 				/* Jump to next possible match */
 				mj = matchjump[pp - mustfirst];
-				cj = charjump[*dp];
+				cj = charjump[(unsigned char) *dp];
 				dp += (cj < mj ? mj : cj);
 				pp = mustlast;
 			}
@@ -364,6 +364,9 @@ sopno stopst;
 	char *ssp;		/* start of string matched by subsubRE */
 	char *sep;		/* end of string matched by subsubRE */
 	char *oldssp;		/* previous ssp */
+/* dp is only used for assertion testing which, for some reason, is not
+   recognized as usage. */
+#pragma GCC diagnostic ignored "-Wunused-but-set-variable"
 	char *dp;
 
 	AT("diss", start, stop, startst, stopst);
diff --git a/newlib/libc/posix/glob.c b/newlib/libc/posix/glob.c
index 4dafe71aa..977a5a4f8 100644
--- a/newlib/libc/posix/glob.c
+++ b/newlib/libc/posix/glob.c
@@ -30,6 +30,10 @@
  * SUCH DAMAGE.
  */
 
+#ifdef __CYGWIN__
+#define _NO_GLOB	/* Cygwin provides its own glob. */
+#endif
+
 #ifndef _NO_GLOB
 
 #if defined(LIBC_SCCS) && !defined(lint)
diff --git a/newlib/libc/posix/popen.c b/newlib/libc/posix/popen.c
index 38978c7aa..faf72b6e3 100644
--- a/newlib/libc/posix/popen.c
+++ b/newlib/libc/posix/popen.c
@@ -113,7 +113,7 @@ _DEFUN(popen, (program, type),
 	const char *program _AND
 	const char *type)
 {
-	struct pid *cur, *last;
+	struct pid *cur;
 	FILE *iop;
 	int pdes[2], pid;
 
@@ -159,8 +159,7 @@ _DEFUN(popen, (program, type),
 			(void)close(pdes[1]);
 		}
 		/* Close all fd's created by prior popen.  */
-		for (last = NULL, cur = pidlist; cur;
-		     last = cur, cur = cur->next)
+		for (cur = pidlist; cur; cur = cur->next)
 			(void)close (fileno (cur->fp));
 		execl(_PATH_BSHELL, "sh", "-c", program, NULL);
 		_exit(127);
diff --git a/newlib/libc/posix/regcomp.c b/newlib/libc/posix/regcomp.c
index 7f9e188a7..bd90d2cdf 100644
--- a/newlib/libc/posix/regcomp.c
+++ b/newlib/libc/posix/regcomp.c
@@ -103,8 +103,8 @@ static void freeset(struct parse *p, cset *cs);
 static int freezeset(struct parse *p, cset *cs);
 static int firstch(struct parse *p, cset *cs);
 static int nch(struct parse *p, cset *cs);
-static void mcadd(struct parse *p, cset *cs, char *cp);
 #if used
+static void mcadd(struct parse *p, cset *cs, char *cp);
 static void mcsub(cset *cs, char *cp);
 static int mcin(cset *cs, char *cp);
 static char *mcfind(cset *cs, char *cp);
@@ -308,8 +308,8 @@ struct parse *p;
 int stop;			/* character this ERE should end at */
 {
 	char c;
-	sopno prevback;
-	sopno prevfwd;
+	sopno prevback = 0;
+	sopno prevfwd = 0;
 	sopno conc;
 	int first = 1;		/* is this the first alternative? */
 
@@ -1333,6 +1333,7 @@ cset *cs;
 	return(n);
 }
 
+#if used
 /*
  - mcadd - add a collating element to a cset
  == static void mcadd(struct parse *p, cset *cs, \
@@ -1360,7 +1361,6 @@ char *cp;
 	cs->multis[cs->smultis - 1] = '\0';
 }
 
-#if used
 /*
  - mcsub - subtract a collating element from a cset
  == static void mcsub(cset *cs, char *cp);
@@ -1688,8 +1688,8 @@ struct parse *p;
 struct re_guts *g;
 {
 	sop *scan;
-	sop *start;
-	sop *newstart;
+	sop *start = NULL;
+	sop *newstart = NULL;
 	sopno newlen;
 	sop s;
 	char *cp;
@@ -1961,7 +1961,7 @@ struct re_guts *g;
 	 * is the first one that would be matched).
 	 */
 	for (mindex = 0; mindex < g->mlen; mindex++)
-		g->charjump[g->must[mindex]] = g->mlen - mindex - 1;
+		g->charjump[(unsigned char) g->must[mindex]] = g->mlen - mindex - 1;
 }
 
 /*
diff --git a/newlib/libc/posix/wordexp.c b/newlib/libc/posix/wordexp.c
index b6c4a6d1f..bfdb63fd0 100644
--- a/newlib/libc/posix/wordexp.c
+++ b/newlib/libc/posix/wordexp.c
@@ -37,7 +37,6 @@ wordexp(const char *words, wordexp_t *pwordexp, int flags)
   char *iter;
   pid_t pid;
   int num_words = 0;
-  int num_bytes = 0;
   int fd[2];
   int fd_err[2];
   int err = 0;
@@ -129,8 +128,6 @@ wordexp(const char *words, wordexp_t *pwordexp, int flags)
       if((iter = strchr(tmp, '\n')))
           *iter = '\0';
 
-      num_bytes = atoi(tmp) + pwordexp->we_wordc;
-
       /* Get each expansion from the shell output, and store each in
          pwordexp's we_wordv vector. */
       for(i = 0; i < num_words; i++)