Merge branch 'da/xdiff-w-sign-compare-workaround'

Noises from "-Wsign-compare" in the borrowed xdiff code has been
squelched.

* da/xdiff-w-sign-compare-workaround:
  xdiff: avoid signed vs. unsigned comparisons in xutils.c
  xdiff: avoid signed vs. unsigned comparisons in xpatience.c
  xdiff: avoid signed vs. unsigned comparisons in xhistogram.c
  xdiff: avoid signed vs. unsigned comparisons in xemit.c
  xdiff: avoid signed vs. unsigned comparisons in xdiffi.c
  xdiff: move sign comparison warning guard into each file

Author: gitster

xdiff/xdiffi.c

@@ -19,7 +19,6 @@
  *  Davide Libenzi <[email protected]>
  *
  */
-#define DISABLE_SIGN_COMPARE_WARNINGS
 
 #include "xinclude.h"
 
@@ -1014,7 +1013,7 @@ static void xdl_mark_ignorable_lines(xdchange_t *xscr, xdfenv_t *xe, long flags)
 
 static int record_matches_regex(xrecord_t *rec, xpparam_t const *xpp) {
 	regmatch_t regmatch;
-	int i;
+	size_t i;
 
 	for (i = 0; i < xpp->ignore_regex_nr; i++)
 		if (!regexec_buf(xpp->ignore_regex[i], rec->ptr, rec->size, 1,

xdiff/xemit.c

@@ -54,7 +54,7 @@ xdchange_t *xdl_get_hunk(xdchange_t **xscr, xdemitconf_t const *xecfg)
 	xdchange_t *xch, *xchp, *lxch;
 	long max_common = 2 * xecfg->ctxlen + xecfg->interhunkctxlen;
 	long max_ignorable = xecfg->ctxlen;
-	unsigned long ignored = 0; /* number of ignored blank lines */
+	long ignored = 0; /* number of ignored blank lines */
 
 	/* remove ignorable changes that are too far before other changes */
 	for (xchp = *xscr; xchp && xchp->ignore; xchp = xchp->next) {

xdiff/xhistogram.c

@@ -106,7 +106,7 @@ static int scanA(struct histindex *index, int line1, int count1)
 	unsigned int chain_len;
 	struct record **rec_chain, *rec;
 
-	for (ptr = LINE_END(1); line1 <= ptr; ptr--) {
+	for (ptr = LINE_END(1); (unsigned int)line1 <= ptr; ptr--) {
 		tbl_idx = TABLE_HASH(index, 1, ptr);
 		rec_chain = index->records + tbl_idx;
 		rec = *rec_chain;
@@ -181,14 +181,14 @@ static int try_lcs(struct histindex *index, struct region *lcs, int b_ptr,
 			be = bs;
 			rc = rec->cnt;
 
-			while (line1 < as && line2 < bs
+			while ((unsigned int)line1 < as && (unsigned int)line2 < bs
 				&& CMP(index, 1, as - 1, 2, bs - 1)) {
 				as--;
 				bs--;
 				if (1 < rc)
 					rc = XDL_MIN(rc, CNT(index, as));
 			}
-			while (ae < LINE_END(1) && be < LINE_END(2)
+			while (ae < (unsigned int)LINE_END(1) && be < (unsigned int)LINE_END(2)
 				&& CMP(index, 1, ae + 1, 2, be + 1)) {
 				ae++;
 				be++;
@@ -313,7 +313,7 @@ static int histogram_diff(xpparam_t const *xpp, xdfenv_t *env,
 	if (count1 <= 0 && count2 <= 0)
 		return 0;
 
-	if (LINE_END(1) >= MAX_PTR)
+	if ((unsigned int)LINE_END(1) >= MAX_PTR)
 		return -1;
 
 	if (!count1) {

xdiff/xinclude.h

@@ -23,8 +23,6 @@
 #if !defined(XINCLUDE_H)
 #define XINCLUDE_H
 
-#define DISABLE_SIGN_COMPARE_WARNINGS
-
 #include "git-compat-util.h"
 #include "xmacros.h"
 #include "xdiff.h"

xdiff/xpatience.c

@@ -19,6 +19,7 @@
  *  Davide Libenzi <[email protected]>
  *
  */
+
 #include "xinclude.h"
 
 /*
@@ -75,7 +76,7 @@ struct hashmap {
 
 static int is_anchor(xpparam_t const *xpp, const char *line)
 {
-	int i;
+	size_t i;
 	for (i = 0; i < xpp->anchors_nr; i++) {
 		if (!strncmp(line, xpp->anchors[i], strlen(xpp->anchors[i])))
 			return 1;

xdiff/xutils.c

@@ -375,7 +375,7 @@ static int xdl_format_hunk_hdr(long s1, long c1, long s2, long c2,
 	nb += 3;
 	if (func && funclen) {
 		buf[nb++] = ' ';
-		if (funclen > sizeof(buf) - nb - 1)
+		if ((size_t)funclen > sizeof(buf) - nb - 1)
 			funclen = sizeof(buf) - nb - 1;
 		memcpy(buf + nb, func, funclen);
 		nb += funclen;
@@ -437,7 +437,7 @@ void* xdl_alloc_grow_helper(void *p, long nr, long *alloc, size_t size)
 {
 	void *tmp = NULL;
 	size_t n = ((LONG_MAX - 16) / 2 >= *alloc) ? 2 * *alloc + 16 : LONG_MAX;
-	if (nr > n)
+	if ((size_t)nr > n)
 		n = nr;
 	if (SIZE_MAX / size >= n)
 		tmp = xdl_realloc(p, n * size);