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From: yoshiki@gama.UUCP
Newsgroups: comp.lang.c
Subject: cpp of Sun's Unix version 3.2.
Message-ID: <641@gama.is.tsukuba.junet>
Date: Wed, 22-Apr-87 15:27:08 EDT
Article-I.D.: gama.641
Posted: Wed Apr 22 15:27:08 1987
Date-Received: Sat, 2-May-87 01:44:38 EDT
Organization: Inst. Info. Sci. U of TSUKUBA, Ibaraki, Japan
Lines: 42


I have a trouble on cpp of Sun's Unix version 3.2.  I tryed to expand a text
like the following.


# define Macro(f) f

Macro(Func(a,
# ifdef B
     b,
# endif
     c))


I want to get Func(a, c) if B is not defined.  It is, however, expanded by
the cpp to


# 1 "" 


 Func(a, # ifdef B      b, # endif      c)
# 8 "" 


I can get what I want by other cpps (4.2BSD on VAX and Sequent).  Is this a
bug of the cpp, or dependent on implementation?

Sorry if this has been discussed before.

-----------------------------------------------------------------------------

Yoshiki WATANABE
University of Tsukuba

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