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.

43 files changed, 187 insertions, 74 deletions

diff --git a/newlib/ChangeLog b/newlib/ChangeLog
index 9d5d039..4fd84ff 100644
--- a/newlib/ChangeLog
+++ b/newlib/ChangeLog
@@ -1,3 +1,78 @@
+2012-08-08  Corinna Vinschen  <vinschen@redhat.com>
+
+	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.
+
 2012-08-07  Corinna Vinschen  <vinschen@redhat.com>
 
 	* libc/stdlib/mprec.h (Storeinc): Add parenthesis to avoid compiler
diff --git a/newlib/libc/include/stdio.h b/newlib/libc/include/stdio.h
index 2912eaf..305e409 100644
--- a/newlib/libc/include/stdio.h
+++ b/newlib/libc/include/stdio.h
@@ -227,6 +227,9 @@ int	_EXFUN(sprintf, (char *, const char *, ...)
                _ATTRIBUTE ((__format__ (__printf__, 2, 3))));
 int	_EXFUN(remove, (const char *));
 int	_EXFUN(rename, (const char *, const char *));
+#ifdef _COMPILING_NEWLIB
+int	_EXFUN(_rename, (const char *, const char *));
+#endif
 #endif
 #if !defined(__STRICT_ANSI__) || defined(__USE_XOPEN2K)
 #ifdef _COMPILING_NEWLIB
diff --git a/newlib/libc/include/sys/signal.h b/newlib/libc/include/sys/signal.h
index 881df83..4e3be1c 100644
--- a/newlib/libc/include/sys/signal.h
+++ b/newlib/libc/include/sys/signal.h
@@ -143,6 +143,9 @@ int _EXFUN(pthread_sigmask, (int how, const sigset_t *set, sigset_t *oset));
 #undef sigfillset
 #undef sigismember
 
+#ifdef _COMPILING_NEWLIB
+int _EXFUN(_kill, (pid_t, int));
+#endif
 int _EXFUN(kill, (pid_t, int));
 int _EXFUN(killpg, (pid_t, int));
 int _EXFUN(sigaction, (int, const struct sigaction *, struct sigaction *));
diff --git a/newlib/libc/include/sys/stat.h b/newlib/libc/include/sys/stat.h
index f00caa6..fa2036d 100644
--- a/newlib/libc/include/sys/stat.h
+++ b/newlib/libc/include/sys/stat.h
@@ -170,8 +170,10 @@ int	_EXFUN(futimens, (int, const struct timespec *));
 #ifdef _COMPILING_NEWLIB
 int	_EXFUN(_fstat,( int __fd, struct stat *__sbuf ));
 int	_EXFUN(_stat,( const char *__path, struct stat *__sbuf ));
+int	_EXFUN(_mkdir,( const char *_path, mode_t __mode ));
 #ifdef __LARGE64_FILES
 struct stat64;
+int	_EXFUN(_stat64,( const char *__path, struct stat64 *__sbuf ));
 int	_EXFUN(_fstat64,( int __fd, struct stat64 *__sbuf ));
 #endif
 #endif
diff --git a/newlib/libc/include/sys/time.h b/newlib/libc/include/sys/time.h
index 3c9bf77..b388b2c 100644
--- a/newlib/libc/include/sys/time.h
+++ b/newlib/libc/include/sys/time.h
@@ -71,6 +71,10 @@ struct  itimerval {
   } while (0)
 #endif /* defined (__rtems__) || defined (__CYGWIN__) */
 
+#ifdef _COMPILING_NEWLIB
+int _EXFUN(_gettimeofday, (struct timeval *__p, void *__tz));
+#endif
+
 int _EXFUN(gettimeofday, (struct timeval *__p, void *__tz));
 int _EXFUN(settimeofday, (const struct timeval *, const struct timezone *));
 int _EXFUN(utimes, (const char *__path, const struct timeval *__tvp));
diff --git a/newlib/libc/include/sys/times.h b/newlib/libc/include/sys/times.h
index 9375cb1..927812c 100644
--- a/newlib/libc/include/sys/times.h
+++ b/newlib/libc/include/sys/times.h
@@ -21,6 +21,9 @@ struct tms {
 };
 
 clock_t _EXFUN(times,(struct tms *));
+#ifdef _COMPILING_NEWLIB
+clock_t _EXFUN(_times,(struct tms *));
+#endif
 
 #ifdef __cplusplus
 }
diff --git a/newlib/libc/include/sys/wait.h b/newlib/libc/include/sys/wait.h
index 0e4a339..73fe372 100644
--- a/newlib/libc/include/sys/wait.h
+++ b/newlib/libc/include/sys/wait.h
@@ -29,6 +29,10 @@ extern "C" {
 pid_t wait (int *);
 pid_t waitpid (pid_t, int *, int);
 
+#ifdef _COMPILING_NEWLIB
+pid_t _wait (int *);
+#endif
+
 /* Provide prototypes for most of the _<systemcall> names that are
    provided in newlib for some compilers.  */
 pid_t _wait (int *);
diff --git a/newlib/libc/locale/lmessages.c b/newlib/libc/locale/lmessages.c
index 33a4a5a..9fb1df4 100644
--- a/newlib/libc/locale/lmessages.c
+++ b/newlib/libc/locale/lmessages.c
@@ -35,7 +35,9 @@
 #define LCMESSAGES_SIZE_MIN \
 		(offsetof(struct lc_messages_T, yesstr) / sizeof(char *))
 
+#ifndef __CYGWIN__
 static char empty[] = "";
+#endif
 
 static const struct lc_messages_T _C_messages_locale = {
 	"^[yY]" ,	/* yesexpr */
diff --git a/newlib/libc/locale/lmonetary.c b/newlib/libc/locale/lmonetary.c
index f1101a9..80c2d04 100644
--- a/newlib/libc/locale/lmonetary.c
+++ b/newlib/libc/locale/lmonetary.c
@@ -79,6 +79,7 @@ static struct lc_monetary_T _monetary_locale;
 static int	_monetary_using_locale;
 static char	*_monetary_locale_buf;
 
+#ifndef __CYGWIN__
 static char
 cnv(const char *str) {
 	int i = strtol(str, NULL, 10);
@@ -86,6 +87,7 @@ cnv(const char *str) {
 		i = CHAR_MAX;
 	return (char)i;
 }
+#endif
 
 int
 __monetary_load_locale(const char *name , void *f_wctomb, const char *charset)
diff --git a/newlib/libc/locale/nl_langinfo.c b/newlib/libc/locale/nl_langinfo.c
index 392a7cb..4b7e983 100644
--- a/newlib/libc/locale/nl_langinfo.c
+++ b/newlib/libc/locale/nl_langinfo.c
@@ -182,7 +182,10 @@ char *
 _DEFUN(nl_langinfo, (item), 
        nl_item item) {
 
-   char *ret, *s, *cs;
+   char *ret, *cs;
+#ifndef __CYGWIN__
+   char *s;
+#endif
    static char *csym = NULL;
 #ifdef TRANSITION_PERIOD_HACK
    static char *cset = NULL;
diff --git a/newlib/libc/posix/collate.c b/newlib/libc/posix/collate.c
index 6ee4550..8bb04ef 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 8494b90..5956e27 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 4dafe71..977a5a4 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 38978c7..faf72b6 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 7f9e188..bd90d2c 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 b6c4a6d..bfdb63f 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++)
diff --git a/newlib/libc/reent/mkdirr.c b/newlib/libc/reent/mkdirr.c
index 29d808d..fe36de1 100644
--- a/newlib/libc/reent/mkdirr.c
+++ b/newlib/libc/reent/mkdirr.c
@@ -44,6 +44,8 @@ DESCRIPTION
 	<<errno>>.
 */
 
+#include <sys/stat.h>
+
 int
 _DEFUN (_mkdir_r, (ptr, path, mode),
      struct _reent *ptr _AND
diff --git a/newlib/libc/reent/renamer.c b/newlib/libc/reent/renamer.c
index 4d2d256..d3951a2 100644
--- a/newlib/libc/reent/renamer.c
+++ b/newlib/libc/reent/renamer.c
@@ -1,6 +1,7 @@
 /* Reentrant version of rename system call.  */
 
 #include <reent.h>
+#include <stdio.h>
 #include <unistd.h>
 #include <sys/stat.h>
 #include <_syslist.h>
diff --git a/newlib/libc/search/hash.c b/newlib/libc/search/hash.c
index 0301fc0..997acb3 100644
--- a/newlib/libc/search/hash.c
+++ b/newlib/libc/search/hash.c
@@ -141,9 +141,9 @@ _DEFUN(__hash_open, (file, flags, mode, info, dflags),
 	new_table = 0;
 	if (!file || (flags & O_TRUNC) ||
 #ifdef __USE_INTERNAL_STAT64
-	    (stat64(file, &statbuf) && (errno == ENOENT))) {
+	    (_stat64(file, &statbuf) && (errno == ENOENT))) {
 #else
-	    (stat(file, &statbuf) && (errno == ENOENT))) {
+	    (_stat(file, &statbuf) && (errno == ENOENT))) {
 #endif
 		if (errno == ENOENT)
 			errno = 0; /* Just in case someone looks at errno */
@@ -157,9 +157,9 @@ _DEFUN(__hash_open, (file, flags, mode, info, dflags),
 		   a new .db file, then reinitialize the database */
 		if ((flags & O_CREAT) &&
 #ifdef __USE_INTERNAL_STAT64
-		     fstat64(hashp->fp, &statbuf) == 0 && statbuf.st_size == 0)
+		     _fstat64(hashp->fp, &statbuf) == 0 && statbuf.st_size == 0)
 #else
-		     fstat(hashp->fp, &statbuf) == 0 && statbuf.st_size == 0)
+		     _fstat(hashp->fp, &statbuf) == 0 && statbuf.st_size == 0)
 #endif
 			new_table = 1;
 
@@ -316,7 +316,11 @@ init_hash(hashp, file, info)
 	const char *file;
 	const HASHINFO *info;
 {
+#ifdef __USE_INTERNAL_STAT64
+        struct stat64 statbuf;
+#else
 	struct stat statbuf;
+#endif
 	int nelem;
 
 	nelem = 1;
@@ -335,9 +339,9 @@ init_hash(hashp, file, info)
 	/* Fix bucket size to be optimal for file system */
 	if (file != NULL) {
 #ifdef __USE_INTERNAL_STAT64
-		if (stat64(file, &statbuf))
+		if (_stat64(file, &statbuf))
 #else
-		if (stat(file, &statbuf))
+		if (_stat(file, &statbuf))
 #endif
 			return (NULL);
 		hashp->BSIZE = statbuf.st_blksize;
diff --git a/newlib/libc/search/hash_bigkey.c b/newlib/libc/search/hash_bigkey.c
index 449b6be..8ff52b3 100644
--- a/newlib/libc/search/hash_bigkey.c
+++ b/newlib/libc/search/hash_bigkey.c
@@ -123,7 +123,7 @@ __big_insert(hashp, bufp, key, val)
 		if (!bufp)
 			return (-1);
 		n = p[0];
-		if (!key_size)
+		if (!key_size) {
 			if (FREESPACE(p)) {
 				move_bytes = MIN(FREESPACE(p), val_size);
 				off = OFFSET(p) - move_bytes;
@@ -136,6 +136,7 @@ __big_insert(hashp, bufp, key, val)
 				OFFSET(p) = off;
 			} else
 				p[n - 2] = FULL_KEY;
+		}
 		p = (__uint16_t *)bufp->page;
 		cp = bufp->page;
 		bufp->flags |= BUF_MOD;
diff --git a/newlib/libc/search/hash_page.c b/newlib/libc/search/hash_page.c
index 68ab9db..7ca304d 100644
--- a/newlib/libc/search/hash_page.c
+++ b/newlib/libc/search/hash_page.c
@@ -667,7 +667,7 @@ static __uint16_t
 overflow_page(hashp)
 	HTAB *hashp;
 {
-	__uint32_t *freep;
+	__uint32_t *freep = NULL;
 	int max_free, offset, splitnum;
 	__uint16_t addr;
 	int bit, first_page, free_bit, free_page, i, in_use_bits, j;
diff --git a/newlib/libc/stdio/asiprintf.c b/newlib/libc/stdio/asiprintf.c
index 97474fd..0c363d5 100644
--- a/newlib/libc/stdio/asiprintf.c
+++ b/newlib/libc/stdio/asiprintf.c
@@ -45,7 +45,7 @@ _DEFUN(_asiprintf_r, (ptr, strp, fmt),
   if (ret >= 0)
     {
       *f._p = 0;
-      *strp = f._bf._base;
+      *strp = (char *) f._bf._base;
     }
   return (ret);
 }
@@ -72,7 +72,7 @@ _DEFUN(asiprintf, (strp, fmt),
   if (ret >= 0)
     {
       *f._p = 0;
-      *strp = f._bf._base;
+      *strp = (char *) f._bf._base;
     }
   return (ret);
 }
diff --git a/newlib/libc/stdio/asprintf.c b/newlib/libc/stdio/asprintf.c
index 59a08c8..7b26d9f 100644
--- a/newlib/libc/stdio/asprintf.c
+++ b/newlib/libc/stdio/asprintf.c
@@ -45,7 +45,7 @@ _DEFUN(_asprintf_r, (ptr, strp, fmt),
   if (ret >= 0)
     {
       *f._p = 0;
-      *strp = f._bf._base;
+      *strp = (char *) f._bf._base;
     }
   return (ret);
 }
@@ -72,7 +72,7 @@ _DEFUN(asprintf, (strp, fmt),
   if (ret >= 0)
     {
       *f._p = 0;
-      *strp = f._bf._base;
+      *strp = (char *) f._bf._base;
     }
   return (ret);
 }
diff --git a/newlib/libc/stdio/freopen.c b/newlib/libc/stdio/freopen.c
index 6483655..b33eb1e 100644
--- a/newlib/libc/stdio/freopen.c
+++ b/newlib/libc/stdio/freopen.c
@@ -208,7 +208,7 @@ _DEFUN(_freopen_r, (ptr, file, mode, fp),
   if (HASLB (fp))
     FREELB (ptr, fp);
   fp->_lb._size = 0;
-  fp->_flags & ~__SORD;
+  fp->_flags &= ~__SORD;
   fp->_flags2 = 0;
   memset (&fp->_mbstate, 0, sizeof (_mbstate_t));
 
diff --git a/newlib/libc/stdio/mktemp.c b/newlib/libc/stdio/mktemp.c
index 1c5d76d..ecbc7af 100644
--- a/newlib/libc/stdio/mktemp.c
+++ b/newlib/libc/stdio/mktemp.c
@@ -247,7 +247,7 @@ _DEFUN(_gettemp, (ptr, path, doopen, domkdir, suffixlen, flags),
 	  else
 	    {
 	      /* Safe, since it only encounters 7-bit characters.  */
-	      if (isdigit (*trv))
+	      if (isdigit ((unsigned char) *trv))
 		*trv = 'a';
 	      else
 		++ * trv;
diff --git a/newlib/libc/stdio/vasiprintf.c b/newlib/libc/stdio/vasiprintf.c
index 15310cc..f96de0d 100644
--- a/newlib/libc/stdio/vasiprintf.c
+++ b/newlib/libc/stdio/vasiprintf.c
@@ -59,7 +59,7 @@ _DEFUN(_vasiprintf_r, (ptr, strp, fmt, ap),
   if (ret >= 0)
     {
       *f._p = 0;
-      *strp = f._bf._base;
+      *strp = (char *) f._bf._base;
     }
   return ret;
 }
diff --git a/newlib/libc/stdio/vasprintf.c b/newlib/libc/stdio/vasprintf.c
index b89f4db..fbb54cb 100644
--- a/newlib/libc/stdio/vasprintf.c
+++ b/newlib/libc/stdio/vasprintf.c
@@ -59,7 +59,7 @@ _DEFUN(_vasprintf_r, (ptr, strp, fmt, ap),
   if (ret >= 0)
     {
       *f._p = 0;
-      *strp = f._bf._base;
+      *strp = (char *) f._bf._base;
     }
   return ret;
 }
diff --git a/newlib/libc/stdio/vfprintf.c b/newlib/libc/stdio/vfprintf.c
index 5598991..4b165e0 100644
--- a/newlib/libc/stdio/vfprintf.c
+++ b/newlib/libc/stdio/vfprintf.c
@@ -567,9 +567,9 @@ _DEFUN(_VFPRINTF_R, (data, fp, fmt0, ap),
 	char sign;		/* sign prefix (' ', '+', '-', or \0) */
 #ifdef _WANT_IO_C99_FORMATS
 				/* locale specific numeric grouping */
-	char *thousands_sep;
-	size_t thsnd_len;
-	const char *grouping;
+	char *thousands_sep = NULL;
+	size_t thsnd_len = 0;
+	const char *grouping = NULL;
 #endif
 #ifdef FLOATING_POINT
 	char *decimal_point = _localeconv_r (data)->decimal_point;
@@ -585,7 +585,7 @@ _DEFUN(_VFPRINTF_R, (data, fp, fmt0, ap),
 #if defined (FLOATING_POINT) || defined (_WANT_IO_C99_FORMATS)
 	int ndig = 0;		/* actual number of digits returned by cvt */
 #endif
-#ifdef _WANT_IO_C99_FORMATS
+#if defined (FLOATING_POINT) && defined (_WANT_IO_C99_FORMATS)
 	int nseps;		/* number of group separators with ' */
 	int nrepeats;		/* number of repeats of the last group */
 #endif
@@ -793,10 +793,10 @@ _DEFUN(_VFPRINTF_R, (data, fp, fmt0, ap),
 		sign = '\0';
 #ifdef FLOATING_POINT
 		lead = 0;
-#endif
 #ifdef _WANT_IO_C99_FORMATS
 		nseps = nrepeats = 0;
 #endif
+#endif
 #ifndef _NO_POS_ARGS
 		N = arg_index;
 		is_pos_arg = 0;
diff --git a/newlib/libc/stdio/vfscanf.c b/newlib/libc/stdio/vfscanf.c
index e05082d..e967719 100644
--- a/newlib/libc/stdio/vfscanf.c
+++ b/newlib/libc/stdio/vfscanf.c
@@ -243,10 +243,7 @@ static void * get_arg (int, va_list *, int *, void **);
 #define	CT_INT		3	/* integer, i.e., strtol or strtoul */
 #define	CT_FLOAT	4	/* floating, i.e., strtod */
 
-#if 0
 #define u_char unsigned char
-#endif
-#define u_char char
 #define u_long unsigned long
 
 #ifndef _NO_LONGLONG
@@ -513,8 +510,8 @@ _DEFUN(__SVFSCANF_R, (rptr, fp, fmt0, ap),
 #ifndef _MB_CAPABLE
       wc = *fmt;
 #else
-      nbytes = __mbtowc (rptr, &wc, fmt, MB_CUR_MAX, __locale_charset (),
-			 &state);
+      nbytes = __mbtowc (rptr, &wc, (char *) fmt, MB_CUR_MAX,
+			 __locale_charset (), &state);
       if (nbytes < 0) {
 	wc = 0xFFFD; /* Unicode replacement character */
 	nbytes = 1;
diff --git a/newlib/libc/stdio/vfwprintf.c b/newlib/libc/stdio/vfwprintf.c
index 029f1d0..7d38ecf 100644
--- a/newlib/libc/stdio/vfwprintf.c
+++ b/newlib/libc/stdio/vfwprintf.c
@@ -396,10 +396,11 @@ _DEFUN(_VFWPRINTF_R, (data, fp, fmt0, ap),
 	wchar_t sign;		/* sign prefix (' ', '+', '-', or \0) */
 #ifdef _WANT_IO_C99_FORMATS
 				/* locale specific numeric grouping */
-	wchar_t thousands_sep;
-	const char *grouping;
+	wchar_t thousands_sep = L'\0';
+	const char *grouping = NULL;
 #endif
-#ifdef _MB_CAPABLE
+#if defined (FLOATING_POINT) && defined (_MB_CAPABLE) \
+    && !defined (__HAVE_LOCALE_INFO_EXTENDED__)
 	mbstate_t state;        /* mbtowc calls from library must not change state */
 #endif
 #ifdef FLOATING_POINT
@@ -415,7 +416,7 @@ _DEFUN(_VFWPRINTF_R, (data, fp, fmt0, ap),
 #if defined (FLOATING_POINT) || defined (_WANT_IO_C99_FORMATS)
 	int ndig = 0;		/* actual number of digits returned by cvt */
 #endif
-#ifdef _WANT_IO_C99_FORMATS
+#if defined (FLOATING_POINT) && defined (_WANT_IO_C99_FORMATS)
 	int nseps;		/* number of group separators with ' */
 	int nrepeats;		/* number of repeats of the last group */
 #endif
@@ -619,10 +620,10 @@ _DEFUN(_VFWPRINTF_R, (data, fp, fmt0, ap),
 		sign = L'\0';
 #ifdef FLOATING_POINT
 		lead = 0;
-#endif
 #ifdef _WANT_IO_C99_FORMATS
 		nseps = nrepeats = 0;
 #endif
+#endif
 #ifndef _NO_POS_ARGS
 		N = arg_index;
 		is_pos_arg = 0;
diff --git a/newlib/libc/stdlib/mbtowc_r.c b/newlib/libc/stdlib/mbtowc_r.c
index 7c6be69..d84fef5 100644
--- a/newlib/libc/stdlib/mbtowc_r.c
+++ b/newlib/libc/stdlib/mbtowc_r.c
@@ -78,6 +78,7 @@ typedef enum { COPY_A, COPY_J1, COPY_J2, MAKE_A, NOOP, EMPTY, ERROR } JIS_ACTION
  * is 2 (switch to JIS) + 2 (JIS characters) + 2 (switch back to ASCII) = 6.
  *************************************************************************************/
 
+#ifndef  __CYGWIN__
 static JIS_STATE JIS_state_table[JIS_S_NUM][JIS_C_NUM] = {
 /*              ESCAPE   DOLLAR    BRACKET   AT       B       J        NUL      JIS_CHAR  OTHER */
 /* ASCII */   { A_ESC,   ASCII,    ASCII,    ASCII,   ASCII,  ASCII,   ASCII,   ASCII,    ASCII },
@@ -99,6 +100,7 @@ static JIS_ACTION JIS_action_table[JIS_S_NUM][JIS_C_NUM] = {
 /* J_ESC */   { ERROR,   ERROR,    NOOP,     ERROR,   ERROR,   ERROR,   ERROR,   ERROR,   ERROR },
 /* J_ESC_BR */{ ERROR,   ERROR,    ERROR,    ERROR,   MAKE_A,  MAKE_A,  ERROR,   ERROR,   ERROR },
 };
+#endif /* !__CYGWIN__ */
 
 /* we override the mbstate_t __count field for more complex encodings and use it store a state value */
 #define __state __count
diff --git a/newlib/libc/stdlib/wctomb_r.c b/newlib/libc/stdlib/wctomb_r.c
index 98a0b74..13e1e4c 100644
--- a/newlib/libc/stdlib/wctomb_r.c
+++ b/newlib/libc/stdlib/wctomb_r.c
@@ -81,7 +81,7 @@ _DEFUN (__utf8_wctomb, (r, s, wchar, charset, state),
 	 to return extra 3 bytes. */
       wchar_t tmp;
       tmp = (state->__value.__wchb[0] << 16 | state->__value.__wchb[1] << 8)
-	    - 0x10000 >> 10 | 0xd80d;
+	    - (0x10000 >> 10 | 0xd80d);
       *s++ = 0xe0 | ((tmp & 0xf000) >> 12);
       *s++ = 0x80 | ((tmp &  0xfc0) >> 6);
       *s++ = 0x80 |  (tmp &   0x3f);
diff --git a/newlib/libc/string/strcasestr.c b/newlib/libc/string/strcasestr.c
index 0122d7a..8ff91fd 100644
--- a/newlib/libc/string/strcasestr.c
+++ b/newlib/libc/string/strcasestr.c
@@ -84,6 +84,8 @@ QUICKREF
   (!memchr ((h) + (h_l), '\0', (j) + (n_l) - (h_l))	\
    && ((h_l) = (j) + (n_l)))
 # define CANON_ELEMENT(c) tolower (c)
+/* strncasecmp uses signed char, CMP_FUNC is expected to use unsigned char. */
+#pragma GCC diagnostic ignored "-Wpointer-sign"
 # define CMP_FUNC strncasecmp
 # include "str-two-way.h"
 #endif
diff --git a/newlib/libc/time/strptime.c b/newlib/libc/time/strptime.c
index 0fc5f4e..601f93e 100644
--- a/newlib/libc/time/strptime.c
+++ b/newlib/libc/time/strptime.c
@@ -165,8 +165,8 @@ _DEFUN (strptime, (buf, format, timeptr),
 	char *s;
 	int ret;
 
-	if (isspace (c)) {
-	    while (isspace (*buf))
+	if (isspace ((unsigned char) c)) {
+	    while (isspace ((unsigned char) *buf))
 		++buf;
 	} else if (c == '%' && format[1] != '\0') {
 	    c = *++format;
diff --git a/newlib/libm/common/sf_round.c b/newlib/libm/common/sf_round.c
index 1bf6089..c8f1d77 100644
--- a/newlib/libm/common/sf_round.c
+++ b/newlib/libm/common/sf_round.c
@@ -18,16 +18,12 @@
 	float x;
 #endif
 {
-  int signbit;
   __uint32_t w;
   /* Most significant word, least significant word. */
   int exponent_less_127;
 
   GET_FLOAT_WORD(w, x);
 
-  /* Extract sign bit. */
-  signbit = w & 0x80000000;
-
   /* Extract exponent field. */
   exponent_less_127 = (int)((w & 0x7f800000) >> 23) - 127;
 
diff --git a/newlib/libm/math/e_atan2.c b/newlib/libm/math/e_atan2.c
index 268be64..8e9650f 100644
--- a/newlib/libm/math/e_atan2.c
+++ b/newlib/libm/math/e_atan2.c
@@ -73,7 +73,7 @@ pi_lo   = 1.2246467991473531772E-16; /* 0x3CA1A626, 0x33145C07 */
 	if(((ix|((lx|-lx)>>31))>0x7ff00000)||
 	   ((iy|((ly|-ly)>>31))>0x7ff00000))	/* x or y is NaN */
 	   return x+y;
-	if((hx-0x3ff00000|lx)==0) return atan(y);   /* x=1.0 */
+	if(((hx-0x3ff00000)|lx)==0) return atan(y);   /* x=1.0 */
 	m = ((hy>>31)&1)|((hx>>30)&2);	/* 2*sign(x)+sign(y) */
 
     /* when y = 0 */
diff --git a/newlib/libm/math/e_exp.c b/newlib/libm/math/e_exp.c
index ce093c6..e7455ee 100644
--- a/newlib/libm/math/e_exp.c
+++ b/newlib/libm/math/e_exp.c
@@ -109,7 +109,7 @@ P5   =  4.13813679705723846039e-08; /* 0x3E663769, 0x72BEA4D0 */
 #endif
 {
 	double y,hi,lo,c,t;
-	__int32_t k,xsb;
+	__int32_t k = 0,xsb;
 	__uint32_t hx;
 
 	GET_HIGH_WORD(hx,x);
@@ -144,7 +144,6 @@ P5   =  4.13813679705723846039e-08; /* 0x3E663769, 0x72BEA4D0 */
 	else if(hx < 0x3e300000)  {	/* when |x|<2**-28 */
 	    if(huge+x>one) return one+x;/* trigger inexact */
 	}
-	else k = 0;
 
     /* x is now in primary range */
 	t  = x*x;
diff --git a/newlib/libm/math/e_pow.c b/newlib/libm/math/e_pow.c
index aac0b42..cad6737 100644
--- a/newlib/libm/math/e_pow.c
+++ b/newlib/libm/math/e_pow.c
@@ -120,9 +120,10 @@ ivln2_l  =  1.92596299112661746887e-08; /* 0x3E54AE0B, 0xF85DDF44 =1/ln2 tail*/
 
     /* x|y==NaN return NaN unless x==1 then return 1 */
 	if(ix > 0x7ff00000 || ((ix==0x7ff00000)&&(lx!=0)) ||
-	   iy > 0x7ff00000 || ((iy==0x7ff00000)&&(ly!=0))) 
+	   iy > 0x7ff00000 || ((iy==0x7ff00000)&&(ly!=0))) {
 	    if(((ix-0x3ff00000)|lx)==0) return one;
 	    else return nan("");	
+	}
 
     /* determine if y is an odd int when x < 0
      * yisint = 0	... y is not an integer
diff --git a/newlib/libm/math/e_rem_pio2.c b/newlib/libm/math/e_rem_pio2.c
index 3e5d0f7..ddfecba 100644
--- a/newlib/libm/math/e_rem_pio2.c
+++ b/newlib/libm/math/e_rem_pio2.c
@@ -89,7 +89,7 @@ pio2_3t =  8.47842766036889956997e-32; /* 0x397B839A, 0x252049C1 */
 	double x,y[];
 #endif
 {
-	double z,w,t,r,fn;
+	double z = 0.0,w,t,r,fn;
 	double tx[3];
 	__int32_t i,j,n,ix,hx;
 	int e0,nx;
diff --git a/newlib/libm/math/ef_exp.c b/newlib/libm/math/ef_exp.c
index 19c570c..6824f99 100644
--- a/newlib/libm/math/ef_exp.c
+++ b/newlib/libm/math/ef_exp.c
@@ -47,7 +47,7 @@ P5   =  4.1381369442e-08; /* 0x3331bb4c */
 #endif
 {
 	float y,hi,lo,c,t;
-	__int32_t k,xsb,sx;
+	__int32_t k = 0,xsb,sx;
 	__uint32_t hx;
 
 	GET_FLOAT_WORD(sx,x);
@@ -79,7 +79,6 @@ P5   =  4.1381369442e-08; /* 0x3331bb4c */
 	else if(hx < 0x31800000)  {	/* when |x|<2**-28 */
 	    if(huge+x>one) return one+x;/* trigger inexact */
 	}
-	else k = 0;
 
     /* x is now in primary range */
 	t  = x*x;
diff --git a/newlib/libm/math/ef_pow.c b/newlib/libm/math/ef_pow.c
index 6804ce4..b3041db 100644
--- a/newlib/libm/math/ef_pow.c
+++ b/newlib/libm/math/ef_pow.c
@@ -77,9 +77,10 @@ ivln2_l  =  7.0526075433e-06; /* 0x36eca570 =1/ln2 tail*/
 
     /* x|y==NaN return NaN unless x==1 then return 1 */
 	if(FLT_UWORD_IS_NAN(ix) ||
-	   FLT_UWORD_IS_NAN(iy))
+	   FLT_UWORD_IS_NAN(iy)) {
 	    if(ix==0x3f800000) return one;
 	    else return nanf("");
+	}
 
     /* determine if y is an odd int when x < 0
      * yisint = 0	... y is not an integer
diff --git a/newlib/libm/math/er_lgamma.c b/newlib/libm/math/er_lgamma.c
index 7c9a153..386a8a7 100644
--- a/newlib/libm/math/er_lgamma.c
+++ b/newlib/libm/math/er_lgamma.c
@@ -216,7 +216,7 @@ static double zero=  0.00000000000000000000e+00;
 	double x; int *signgamp;
 #endif
 {
-	double t,y,z,nadj,p,p1,p2,p3,q,r,w;
+	double t,y,z,nadj = 0.0,p,p1,p2,p3,q,r,w;
 	__int32_t i,hx,lx,ix;
 
 	EXTRACT_WORDS(hx,lx,x);
diff --git a/newlib/libm/math/erf_lgamma.c b/newlib/libm/math/erf_lgamma.c
index 90cc542..3c6ba02 100644
--- a/newlib/libm/math/erf_lgamma.c
+++ b/newlib/libm/math/erf_lgamma.c
@@ -151,7 +151,7 @@ static float zero=  0.0000000000e+00;
 	float x; int *signgamp;
 #endif
 {
-	float t,y,z,nadj,p,p1,p2,p3,q,r,w;
+	float t,y,z,nadj = 0.0,p,p1,p2,p3,q,r,w;
 	__int32_t i,hx,ix;
 
 	GET_FLOAT_WORD(hx,x);