maint: restore ANSI 89 compliance

* data/bison.m4, src/conflicts.c, src/files.c, src/output.c,
* src/symtab.c: Use /* ... */ comments only.
Declare variables before statements.

src/conflicts.c

@@ -569,7 +569,7 @@ conflicts_print (void)
      different strings to translate.  */
   {
     int total = count_sr_conflicts ();
-    // If %expect is not used, but %expect-rr is, then expect 0 sr.
+    /* If %expect is not used, but %expect-rr is, then expect 0 sr.  */
     int expected =
       (expected_sr_conflicts == -1 && expected_rr_conflicts != -1)
       ? 0
@@ -591,7 +591,7 @@ conflicts_print (void)
 
   {
     int total = count_rr_conflicts (true);
-    // If %expect-rr is not used, but %expect is, then expect 0 rr.
+    /* If %expect-rr is not used, but %expect is, then expect 0 rr.  */
     int expected =
       (expected_rr_conflicts == -1 && expected_sr_conflicts != -1)
       ? 0

src/files.c

@@ -140,8 +140,8 @@ xfdopen (int fd, char const *mode)
   FILE *res = fdopen (fd, mode);
   if (! res)
     error (EXIT_FAILURE, get_errno (),
-           // On a separate line to please the "unmarked_diagnostics"
-           // syntax-check.
+           /* On a separate line to please the "unmarked_diagnostics"
+              syntax-check. */
            "fdopen");
   return res;
 }

src/output.c

@@ -318,7 +318,7 @@ type_names_output (FILE *out)
   fputs ("m4_define([b4_type_names],\n[", out);
   for (i = 0; i < nsyms; /* nothing */)
     {
-      // The index of the first symbol of the current type-name.
+      /* The index of the first symbol of the current type-name.  */
       int i0 = i;
       fputs (i ? ",\n[" : "[", out);
       for (; i < nsyms && syms[i]->type_name == syms[i0]->type_name; ++i)
@@ -415,16 +415,16 @@ prepare_symbol_definitions (void)
                       i, Entry, Suffix);                        \
       key = obstack_finish0 (&format_obstack);
 
-      // Whether the symbol has an identifier.
+      /* Whether the symbol has an identifier.  */
       value = symbol_id_get (sym);
       SET_KEY("has_id");
       MUSCLE_INSERT_INT (key, !!value);
 
-      // Its identifier.
+      /* Its identifier.  */
       SET_KEY("id");
       MUSCLE_INSERT_STRING (key, value ? value : "");
 
-      // Its tag.  Typically for documentation purpose.
+      /* Its tag.  Typically for documentation purpose.  */
       SET_KEY("tag");
       MUSCLE_INSERT_STRING (key, sym->tag);
 
@@ -533,7 +533,7 @@ muscles_output (FILE *out)
   symbol_numbers_output (out);
   type_names_output (out);
   user_actions_output (out);
-  // Must be last.
+  /* Must be last.  */
   muscles_m4_output (out);
 }
 

src/symtab.c

@@ -55,7 +55,6 @@ static symbol *
 symbol_new (uniqstr tag, location loc)
 {
   symbol *res = xmalloc (sizeof *res);
-
   uniqstr_assert (tag);
 
   /* If the tag is not a string (starts with a double quote), check
@@ -68,8 +67,11 @@ symbol_new (uniqstr tag, location loc)
   res->location = loc;
 
   res->type_name = NULL;
-  for (int i = 0; i < CODE_PROPS_SIZE; ++i)
-    code_props_none_init (&res->props[i]);
+  {
+    int i;
+    for (i = 0; i < CODE_PROPS_SIZE; ++i)
+      code_props_none_init (&res->props[i]);
+  }
 
   res->number = NUMBER_UNDEFINED;
   res->prec = 0;
@@ -113,8 +115,11 @@ semantic_type_new (uniqstr tag, const location *loc)
   res->tag = tag;
   res->location = loc ? *loc : empty_location;
   res->status = undeclared;
-  for (int i = 0; i < CODE_PROPS_SIZE; ++i)
-    code_props_none_init (&res->props[i]);
+  {
+    int i;
+    for (i = 0; i < CODE_PROPS_SIZE; ++i)
+      code_props_none_init (&res->props[i]);
+  }
 
   return res;
 }
@@ -329,7 +334,7 @@ symbol_class_set (symbol *sym, symbol_class class, location loc, bool declaring)
   if (sym->class != unknown_sym && sym->class != class)
     {
       complain (&loc, complaint, _("symbol %s redefined"), sym->tag);
-      // Don't report both "redefined" and "redeclared".
+      /* Don't report both "redefined" and "redeclared".  */
       warned = true;
     }
 
@@ -401,8 +406,11 @@ symbol_check_defined (symbol *sym)
       sym->number = nvars++;
     }
 
-  for (int i = 0; i < 2; ++i)
-    symbol_code_props_get (sym, i)->is_used = true;
+  {
+    int i;
+    for (i = 0; i < 2; ++i)
+      symbol_code_props_get (sym, i)->is_used = true;
+  }
 
   /* Set the semantic type status associated to the current symbol to
      'declared' so that we could check semantic types unnecessary uses. */
@@ -419,12 +427,13 @@ symbol_check_defined (symbol *sym)
 static inline bool
 semantic_type_check_defined (semantic_type *sem_type)
 {
-  // <*> and <> do not have to be "declared".
+  /* <*> and <> do not have to be "declared".  */
   if (sem_type->status == declared
       || !*sem_type->tag
       || STREQ(sem_type->tag, "*"))
     {
-      for (int i = 0; i < 2; ++i)
+      int i;
+      for (i = 0; i < 2; ++i)
         if (sem_type->props[i].kind != CODE_PROPS_NONE
             && ! sem_type->props[i].is_used)
           complain (&sem_type->location, Wother,
@@ -500,11 +509,14 @@ symbol_check_alias_consistency (symbol *this)
     }
 
 
-  for (int i = 0; i < CODE_PROPS_SIZE; ++i)
-    if (str->props[i].code)
-      symbol_code_props_set (sym, i, &str->props[i]);
-    else if (sym->props[i].code)
-      symbol_code_props_set (str, i, &sym->props[i]);
+  {
+    int i;
+    for (i = 0; i < CODE_PROPS_SIZE; ++i)
+      if (str->props[i].code)
+        symbol_code_props_set (sym, i, &str->props[i]);
+      else if (sym->props[i].code)
+        symbol_code_props_set (str, i, &sym->props[i]);
+  }
 
   if (sym->prec || str->prec)
     {