diagnostics: handle -fno-caret in the called functions

[Akim Demaille]

commit e6d1289f4ac88a3ac488654544b1c2e3bc567a01
Author: Akim Demaille <address@hidden>
Date:   Wed Jan 22 08:49:12 2020 +0100

    diagnostics: handle -fno-caret in the called functions
    
    Don't force callers of location_caret to have to deal with flags that
    disable it.
    
    * src/location.h, src/location.c (location_caret)
    (location_caret_suggestion): Early return if disabled.
    * src/complain.c: Simplify.

diff --git a/src/complain.c b/src/complain.c
index 04e22708..b98fea05 100644
--- a/src/complain.c
+++ b/src/complain.c
@@ -464,7 +464,7 @@ error_message (const location *loc, int *indent, warnings 
flags,
       {
         putc ('\n', stderr);
         flush (stderr);
-        if (loc && feature_flag & feature_caret && !(flags & no_caret))
+        if (loc && !(flags & no_caret))
           location_caret (*loc, style, stderr);
       }
   }
@@ -555,8 +555,7 @@ deprecated_directive (location const *loc, char const *old, 
char const *upd)
       complain (loc, Wdeprecated,
                 _("deprecated directive: %s, use %s"),
                 quote (old), quote_n (1, upd));
-      if (feature_flag & feature_caret)
-        location_caret_suggestion (*loc, upd, stderr);
+      location_caret_suggestion (*loc, upd, stderr);
       /* Register updates only if -Wdeprecated is enabled.  */
       fixits_register (loc, upd);
     }
diff --git a/src/location.c b/src/location.c
index 62ec9c72..5c567591 100644
--- a/src/location.c
+++ b/src/location.c
@@ -400,6 +400,8 @@ caret_set_column (int col)
 void
 location_caret (location loc, const char *style, FILE *out)
 {
+  if (!(feature_flag & feature_caret))
+    return;
   if (!loc.start.line)
     return;
   if (!caret_set_file (loc.start.file))
@@ -486,6 +488,8 @@ location_caret (location loc, const char *style, FILE *out)
 void
 location_caret_suggestion (location loc, const char *s, FILE *out)
 {
+  if (!(feature_flag & feature_caret))
+    return;
   const char *style = "fixit-insert";
   fprintf (out, "      | %*s",
            loc.start.column - 1 - caret_info.skip
diff --git a/src/location.h b/src/location.h
index ccb42e3c..dcb594fb 100644
--- a/src/location.h
+++ b/src/location.h
@@ -126,12 +126,12 @@ void caret_init (void);
    left-over by the usage of location_caret.  */
 void caret_free (void);
 
-/* Quote the line containing LOC onto OUT.  Highlight the part of LOC
-   with the color STYLE.  */
+/* If -fcaret is enabled, quote the line containing LOC onto OUT.
+   Highlight the part of LOC with the color STYLE.  */
 void location_caret (location loc, const char* style, FILE *out);
 
-/* Display a suggestion of replacement for LOC with S.  To call after
-   location_caret.  */
+/* If -fcaret is enabled, display a suggestion of replacement for LOC
+   with S.  To call after location_caret.  */
 void location_caret_suggestion (location loc, const char *s, FILE *out);
 
 /* Return -1, 0, 1, depending whether a is before, equal, or