style: c: fix a few minor issues about indentation of cpp directives

* README-hacking.md: More about cpp.
* data/skeletons/c.m4, data/skeletons/yacc.c: Style changes.

NEWS

@@ -17,6 +17,12 @@ GNU Bison NEWS
   (2013-07-25), "%error-verbose" is deprecated in favor of "%define
   parse.error verbose".
 
+** Deprecated features
+
+  The YYPRINT macro, which works only with yacc.c and only for tokens, was
+  obsoleted long ago by %printer, introduced in Bison 1.50 (November 2002).
+  It is deprecated and its support will be removed eventually.
+
 ** New features
 
 *** Improved syntax error messages

README-hacking.md

@@ -57,6 +57,31 @@ Actually, Bison has legacy code that we should replace with gnulib modules
 ### Skeletons
 We try to use the "typical" coding style for each language.
 
+#### CPP
+We indent the CPP directives this way:
+
+```
+#if FOO
+# if BAR
+#  define BAZ
+# endif
+#endif
+```
+
+Don't indent with leading spaces in the skeletons (it's ok in the grammar
+files though, e.g., in `%code {...}` blocks).
+
+On occasions, use `cppi -c` to see where we stand.  We don't aim at full
+correctness: depending `-d`, some bits can be in the *.c file, or the *.h
+file within the double-inclusion cpp-guards.  In that case, favor the case
+of the *.h file, but don't waste time on this.
+
+Don't hesitate to leave a comment on the `#endif` (e.g., `#endif /* FOO
+*/`), especially for long blocks.
+
+There is no conistency on `! defined` vs. `!defined`.  The day gnulib
+decides, we'll follow them.
+
 #### C/C++
 Follow the GNU Coding Standards.
 

data/skeletons/c.m4

@@ -965,8 +965,8 @@ m4_define([b4_yy_location_print_define],
    This macro was not mandated originally: define only if we know
    we won't break user code: when these are the locations we know.  */
 
-#ifndef YY_LOCATION_PRINT
+# ifndef YY_LOCATION_PRINT
-# if defined ]b4_api_PREFIX[LTYPE_IS_TRIVIAL && ]b4_api_PREFIX[LTYPE_IS_TRIVIAL
+#  if defined ]b4_api_PREFIX[LTYPE_IS_TRIVIAL && ]b4_api_PREFIX[LTYPE_IS_TRIVIAL
 
 /* Print *YYLOCP on YYO.  Private, do not rely on its existence. */
 
@@ -996,17 +996,17 @@ yy_location_print_ (FILE *yyo, YYLTYPE const * const yylocp)
   return res;
  }
 
-#  define YY_LOCATION_PRINT(File, Loc)          \
+#   define YY_LOCATION_PRINT(File, Loc)          \
   yy_location_print_ (File, &(Loc))
 
-# else
+#  else
-#  define YY_LOCATION_PRINT(File, Loc) ((void) 0)
+#   define YY_LOCATION_PRINT(File, Loc) ((void) 0)
-# endif
+#  endif
-#endif]],
+# endif /* !defined YY_LOCATION_PRINT */]],
 [[/* This macro is provided for backward compatibility. */
-#ifndef YY_LOCATION_PRINT
+# ifndef YY_LOCATION_PRINT
-# define YY_LOCATION_PRINT(File, Loc) ((void) 0)
+#  define YY_LOCATION_PRINT(File, Loc) ((void) 0)
-#endif]])
+# endif]])
 ])
 
 # b4_yyloc_default

data/skeletons/yacc.c

@@ -695,14 +695,14 @@ yysymbol_name (yysymbol_kind_t yysymbol)
 }]])[
 #endif
 
-# ifdef YYPRINT
+#ifdef YYPRINT
 /* YYTOKNUM[NUM] -- (External) token number corresponding to the
    (internal) symbol number NUM (which must be that of a token).  */
 static const ]b4_int_type_for([b4_toknum])[ yytoknum[] =
 {
   ]b4_toknum[
 };
-# endif
+#endif
 
 #define YYPACT_NINF (]b4_pact_ninf[)
 
@@ -1405,10 +1405,10 @@ yysyntax_error (YYPTRDIFF_T *yymsg_alloc, char **yymsg,
 
   switch (yycount)
     {
-# define YYCASE_(N, S)                      \
+#define YYCASE_(N, S)                       \
       case N:                               \
         yyformat = S;                       \
-      break
+        break
     default: /* Avoid compiler warnings. */
       YYCASE_(0, YY_("syntax error"));
       YYCASE_(1, YY_("syntax error, unexpected %s"));
@@ -1416,7 +1416,7 @@ yysyntax_error (YYPTRDIFF_T *yymsg_alloc, char **yymsg,
       YYCASE_(3, YY_("syntax error, unexpected %s, expecting %s or %s"));
       YYCASE_(4, YY_("syntax error, unexpected %s, expecting %s or %s or %s"));
       YYCASE_(5, YY_("syntax error, unexpected %s, expecting %s or %s or %s or %s"));
-# undef YYCASE_
+#undef YYCASE_
     }
 
   /* Compute error message size.  Don't count the "%s"s, but reserve
@@ -1698,7 +1698,7 @@ yysetstate:
         YYSTACK_RELOCATE (yyss_alloc, yyss);
         YYSTACK_RELOCATE (yyvs_alloc, yyvs);]b4_locations_if([
         YYSTACK_RELOCATE (yyls_alloc, yyls);])[
-# undef YYSTACK_RELOCATE
+#  undef YYSTACK_RELOCATE
         if (yyss1 != yyssa)
           YYSTACK_FREE (yyss1);
       }

src/parse-gram.c

@@ -689,7 +689,7 @@ yysymbol_name (yysymbol_kind_t yysymbol)
 }
 #endif
 
-# ifdef YYPRINT
+#ifdef YYPRINT
 /* YYTOKNUM[NUM] -- (External) token number corresponding to the
    (internal) symbol number NUM (which must be that of a token).  */
 static const yytype_int16 yytoknum[] =
@@ -702,7 +702,7 @@ static const yytype_int16 yytoknum[] =
      305,   306,   307,   308,   309,   310,   311,   312,   313,   314,
      315
 };
-# endif
+#endif
 
 #define YYPACT_NINF (-80)
 
@@ -977,8 +977,8 @@ do {                                            \
    This macro was not mandated originally: define only if we know
    we won't break user code: when these are the locations we know.  */
 
-#ifndef YY_LOCATION_PRINT
+# ifndef YY_LOCATION_PRINT
-# if defined GRAM_LTYPE_IS_TRIVIAL && GRAM_LTYPE_IS_TRIVIAL
+#  if defined GRAM_LTYPE_IS_TRIVIAL && GRAM_LTYPE_IS_TRIVIAL
 
 /* Print *YYLOCP on YYO.  Private, do not rely on its existence. */
 
@@ -1008,13 +1008,13 @@ yy_location_print_ (FILE *yyo, YYLTYPE const * const yylocp)
   return res;
  }
 
-#  define YY_LOCATION_PRINT(File, Loc)          \
+#   define YY_LOCATION_PRINT(File, Loc)          \
   yy_location_print_ (File, &(Loc))
 
-# else
+#  else
-#  define YY_LOCATION_PRINT(File, Loc) ((void) 0)
+#   define YY_LOCATION_PRINT(File, Loc) ((void) 0)
-# endif
+#  endif
-#endif
+# endif /* !defined YY_LOCATION_PRINT */
 
 
 # define YY_SYMBOL_PRINT(Title, Type, Value, Location)                    \
@@ -1906,7 +1906,7 @@ yysetstate:
         YYSTACK_RELOCATE (yyss_alloc, yyss);
         YYSTACK_RELOCATE (yyvs_alloc, yyvs);
         YYSTACK_RELOCATE (yyls_alloc, yyls);
-# undef YYSTACK_RELOCATE
+#  undef YYSTACK_RELOCATE
         if (yyss1 != yyssa)
           YYSTACK_FREE (yyss1);
       }