scpp.cat

一个去掉程序中#ifdef #if 等预处理条件为假的程序

SCPP(1)                                                   SCPP(1)


NNAAMMEE
       scpp - selective C preprocessor

SSYYNNOOPPSSIISS
       ssccpppp [ --ii_i_n_c_f_i_l_e ] [ --dd_m_a_c_r_o ] [ --DD_m_a_c_r_o ] [ --DD_m_a_c_r_o_=_d_e_f ]
       [ --CC ]
            [ --II_i_n_c_d_i_r ] [ _f_i_l_e_._._.  ]

DDEESSCCRRIIPPTTIIOONN
       SSccpppp concatenates the input _f_i_l_e_s (or  reads  standard-in,
       if  no  _f_i_l_e is given), interprets all references to given
       macros, leaving the rest of the  _f_i_l_e(s)  unaltered,  then
       writes  the  result  to  standard-out.   It  is helpful in
       removing conditionally compiled code or misleading  macros
       from a file.

       The _f_i_l_e name "--" refers to standard-in.

       The  following  options  are  available.   Each option can
       appear as frequently as desired.

              -d     Interpret all references to the given _m_a_c_r_o_.
                     _M_a_c_r_o can be either a single macro name or a
                     whitespace-separated  list  of  macro  names
                     (e.g. -dMAXINT or -d"MAXINT MININT INTWID").
                     All  occurrences  of  the  macro   and   all
                     instances of the intrinsic macro "defined()"
                     referring to this macro are  expanded.   All
                     preprocessor  directives  referring  to this
                     macro (except ##iiff) perform their usual func-
                     tion  and  do not appear in the output.  ##iiff
                     directives are  interpreted  only  if  their
                     value  is  not dependent on macros which are
                     not to be interpreted.

              -D     Define the _m_a_c_r_o to have the value  _d_e_f_,  or
                     "1"  if  no _d_e_f is given.  Unlike the C pre-
                     processor, ssccpppp does not  implicitly  define
                     certain macros that describe the environment
                     in which the  code  will  be  running  (e.g.
                     "vax" or "unix").  --DD implies --dd..

              -C     Preserve  comments  and whitespace in inter-
                     preted macro  definitions.   Normally,  com-
                     ments  and  leading  and trailing whitespace
                     are stripped from interpreted macro  defini-
                     tions.

              -I     Add  _i_n_c_d_i_r to the list of directories to be
                     searched for include files.   SSccpppp  searches
                     directories  in the same order as the C pre-
                     processor:  if  the  include   filename   is
                     enclosed  in  double-quotes  ("...")  rather
                     than angle-brackets (<...>),  the  directory



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SCPP(1)                                                   SCPP(1)


                     containing the current file being processed;
                     the directories given by -I,  left-to-right;
                     the standard directory, /usr/include.

              -i     Process  the  _f_i_l_e  inclusion  and leave the
                     included text in the output in place of  the
                     original ##iinncclluuddee statement.

AAUUTTHHOORR
       Brad Needham, Tektronix, Inc.

SSEEEE AALLSSOO
       cc(1).

BBUUGGSS
       Very  long  identifiers  (those  over 100 characters long)
       will crash ssccpppp..

       Because ssccpppp interprets only the given macros, the meaning
       of some code will change.  E.g. "scpp -dBOO" of
            #define BOO hello,there
            #define twopar(a,b) a b
            twopar(BOO,folks)
       will generate
            #define twopar(a,b) a b
            twopar(hello,there,folks)
       causing  an argument mismatch when the output is compiled.

       Because uninterpreted  "#if"s,  "ifdef"s,  and  "ifndef"s,
       have  no effect on the output, the following example, when
       processed via "scpp -dLEFT", will generate an  error  mes-
       sage complaining about multiple definitions of "LEFT".
            #ifdef ZULU
            #define LEFT 20
            #else
            #define LEFT 347
            #endif

       The  C  preprocessor macros "____FFIILLEE____" and "____LLIINNEE____" have
       no special meaning to ssccpppp..

















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