Merge branch 'so/diff-index-regression-fix' into maint

Recent "diff -m" changes broke "gitk", which has been corrected.

* so/diff-index-regression-fix:
  diff-index: restore -c/--cc options handling

builtin/diff-index.c

@@ -29,10 +29,10 @@ int cmd_diff_index(int argc, const char **argv, const char *prefix)
 	prefix = precompose_argv_prefix(argc, argv, prefix);
 
 	/*
-	 * We need no diff for merges options, and we need to avoid conflict
-	 * with our own meaning of "-m".
+	 * We need (some of) diff for merges options (e.g., --cc), and we need
+	 * to avoid conflict with our own meaning of "-m".
 	 */
-	diff_merges_suppress_options_parsing();
+	diff_merges_suppress_m_parsing();
 
 	argc = setup_revisions(argc, argv, &rev, NULL);
 	for (i = 1; i < argc; i++) {

diff-merges.c

@@ -6,7 +6,7 @@ typedef void (*diff_merges_setup_func_t)(struct rev_info *);
 static void set_separate(struct rev_info *revs);
 
 static diff_merges_setup_func_t set_to_default = set_separate;
-static int suppress_parsing;
+static int suppress_m_parsing;
 
 static void suppress(struct rev_info *revs)
 {
@@ -91,9 +91,9 @@ int diff_merges_config(const char *value)
 	return 0;
 }
 
-void diff_merges_suppress_options_parsing(void)
+void diff_merges_suppress_m_parsing(void)
 {
-	suppress_parsing = 1;
+	suppress_m_parsing = 1;
 }
 
 int diff_merges_parse_opts(struct rev_info *revs, const char **argv)
@@ -102,10 +102,7 @@ int diff_merges_parse_opts(struct rev_info *revs, const char **argv)
 	const char *optarg;
 	const char *arg = argv[0];
 
-	if (suppress_parsing)
-		return 0;
-
-	if (!strcmp(arg, "-m")) {
+	if (!suppress_m_parsing && !strcmp(arg, "-m")) {
 		set_to_default(revs);
 	} else if (!strcmp(arg, "-c")) {
 		set_combined(revs);
@@ -153,9 +150,6 @@ void diff_merges_set_dense_combined_if_unset(struct rev_info *revs)
 
 void diff_merges_setup_revs(struct rev_info *revs)
 {
-	if (suppress_parsing)
-		return;
-
 	if (revs->combine_merges == 0)
 		revs->dense_combined_merges = 0;
 	if (revs->separate_merges == 0)

diff-merges.h

@@ -11,7 +11,7 @@ struct rev_info;
 
 int diff_merges_config(const char *value);
 
-void diff_merges_suppress_options_parsing(void);
+void diff_merges_suppress_m_parsing(void);
 
 int diff_merges_parse_opts(struct rev_info *revs, const char **argv);