xdiff: PATIENCE/HISTOGRAM are not independent option bits

diff --git a/help.c b/help.c
index 7654f1bfd608d151a213937614449cc497bb638b..cbbe966f685b276cac702bb0fd9a44bfbf5f0e79 100644 (file)
--- a/help.c
+++ b/help.c
@@ -127,7 +127,10 @@ static int is_executable(const char *name)
            !S_ISREG(st.st_mode))
                return 0;
 
-#ifdef WIN32
+#if defined(WIN32) || defined(__CYGWIN__)
+#if defined(__CYGWIN__)
+if ((st.st_mode & S_IXUSR) == 0)
+#endif
 {      /* cannot trust the executable bit, peek into the file instead */
        char buf[3] = { 0 };
        int n;
@@ -302,6 +305,10 @@ static void add_cmd_list(struct cmdnames *cmds, struct cmdnames *old)
 #define SIMILARITY_FLOOR 7
 #define SIMILAR_ENOUGH(x) ((x) < SIMILARITY_FLOOR)
 
+static const char bad_interpreter_advice[] =
+       N_("'%s' appears to be a git command, but we were not\n"
+       "able to execute it. Maybe git-%s is broken?");
+
 const char *help_unknown_cmd(const char *cmd)
 {
        int i, n, best_similarity = 0;
@@ -326,6 +333,14 @@ const char *help_unknown_cmd(const char *cmd)
                int cmp = 0; /* avoid compiler stupidity */
                const char *candidate = main_cmds.names[i]->name;
 
+               /*
+                * An exact match means we have the command, but
+                * for some reason exec'ing it gave us ENOENT; probably
+                * it's a bad interpreter in the #! line.
+                */
+               if (!strcmp(candidate, cmd))
+                       die(_(bad_interpreter_advice), cmd, cmd);
+
                /* Does the candidate appear in common_cmds list? */
                while (n < ARRAY_SIZE(common_cmds) &&
                       (cmp = strcmp(common_cmds[n].name, candidate)) < 0)