ccmode: Multiline Macro Symbols
10.2.9 Multiline Macro Symbols
------------------------------
Multiline preprocessor macro definitions are normally handled just like
other code, i.e., the lines inside them are indented according to the
syntactic analysis of the preceding lines inside the macro. The first
line inside a macro definition (i.e., the line after the starting line
of the cpp directive itself) gets ‘cpp-define-intro’. In this example:
1: #define LIST_LOOP(cons, listp) \
2: for (cons = listp; !NILP (cons); cons = XCDR (cons)) \
3: if (!CONSP (cons)) \
4: signal_error ("Invalid list format", listp); \
5: else
line 1 is given the syntactic symbol ‘cpp-macro’. The first line of a
cpp directive is always given that symbol. Line 2 is given
‘cpp-define-intro’, so that you can give the macro body as a whole some
extra indentation. Lines 3 through 5 are then analyzed as normal code,
i.e., ‘substatement’ on lines 3 and 4, and ‘else-clause’ on line 5.
The syntactic analysis inside macros can be turned off with
‘c-syntactic-indentation-in-macros’ (
Custom Macros). In that
case, lines 2 through 5 would all be given ‘cpp-macro-cont’ with an
anchor position pointing to the ‘#’ which starts the cpp directive(1).
Custom Macros, for more info about the treatment of macros.
---------- Footnotes ----------
(1) This is how CC Mode 5.28 and earlier analyzed macros.
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