Power-Programmierung/CD2.mdf/c/library/os2/elvis/cflags.doc

Text File | 1992-06-20 | 16.0 KB | 463 lines

_9.  _C_F_L_A_G_S

     Elvis uses many preprocessor symbols to control  compi-
lation.   Some  of  these  control  the sizes of buffers and
such.  The "-DNO_XXXX" options remove small sets of  related
features.

     Most  Elvis  users  will  probably  want  to  keep  all
features  available.   Minix-PC  users, though, will have to
sacrifice some sets because otherwise  Elvis  would  be  too
bulky  to  compile.   The "asld" phase of the compiler craps
out.

-DM_SYSV, -Dbsd, -DTOS, -DCOHERENT, -Damiga
     These flags tell the compiler that Elvis is being  com-
     piled for System-V UNIX, BSD UNIX, Atari TOS, Coherent,
     or AmigaDos,  respectively.   For  other  systems,  the
     config.h  file  can  generally  figure it out automati-
     cally.

-DRAINBOW
     For MS-DOS systems, this causes  support  for  the  DEC
     Rainbow to be compiled into Elvis.

-DS5WINSIZE
     Some versions of SysV UNIX don't  support  support  the
     "winsize"   style  of  screen-size  testing,  so  elvis
     ignores window size changes by default.

     However, many of the newer SysV systems  defines  "win-
     size"  in  the file "/usr/include/sys/ptem.h".  If your
     SysV  system  has  "winsize"  then   you   should   add
     -DS5SWINSIZE to the CFLAGS setting.

-DTERMIOS
     POSIX is a SysV-derived specification which uses a ter-
     minal  control  package  called  "termios",  instead of
     "termio".  Some other SysV systems may  also  use  ter-
     mios.   You  can make elvis uses termios instead of the
     more common  termio  by  adding  -DTERMIOS  to  CFLAGS.
     (Note: This hasn't been tested very well.)

-DNBUFS=_n_u_m_b_e_r
     Elvis keeps most of your text in a temporary file; only
     a  small  amount  is actually stored in RAM.  This flag
     allows you to control how much of the file  can  be  in
     RAM  at  any  time.   The  default is 5 blocks, and the
     minimum is 3 blocks.  (See the -DBLKSIZE flag, below.)

     More RAM allows global changes to happen a little  fas-
     ter.
      f you're just making many small changes in one section
     of a file, though, extra RAM won't help much.




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9-2                        CFLAGS                        9-2


-DBLKSIZE=_n_u_m_b_e_r
     This controls the size of blocks that Elvis uses inter-
     nally.   The  value  of BLKSIZE must be a power of two.
     Every time you double BLKSIZE, you quadruple  the  size
     of  a  text  file  that  Elvis can handle, but you also
     cause the temporary file to grow faster.   For  MS-DOS,
     Coherent,  and  Minix-PC,  the  default  value is 1024,
     which allows you to edit files up to almost 512K  bytes
     long.   For  all  other  systems,  the default value is
     2048, which allows you to edit files that are nearly  2
     megabytes long.

     The BLKSIZE also determines the  maximum  line  length,
     and  a few other limits.  BLKSIZE should be either 256,
     512, 1024, or 2048.  Values other than these  can  lead
     to strange behaviour.

-DTMPDIR=_s_t_r_i_n_g
     This sets the default value of the "directory"  option,
     which   specifies  where  the  temporary  files  should
     reside.  The value of TMPDIR must be a  string,  so  be
     sure  your  value includes the quote characters on each
     end.

-DEXRC=_s_t_r, -DHMEXRC=_s_t_r, -DSYSEXRC=_s_t_r, -DEXINIT=_s_t_r
     This lets you control the names of  the  initialization
     files.   Their  values  must  be strings, so be careful
     about quoting.

     EXRC is the name of  the  initialization  file  in  the
     current  directory.   Its  default  value is ".exrc" on
     UNIX systems -- the same as the real  vi.   Since  that
     isn't  a  legal  DOS filename, under DOS the default is
     "elvis.rc".  For  other  systems,  check  the  config.h
     file.

     HMEXRC is the name of the initialization file  in  your
     home  directory.   By  default, it is the same as EXRC.
     Elvis will automatically prepend the name of your  home
     directory  to  HMEXRC at run time, so don't give a full
     path name.

     SYSEXRC is the name  of  a  system-wide  initialization
     file.   It  has no default value; if you don't define a
     value for it, then the code that supports SYSEXRC  just
     isn't  compiled.  The value of SYSEXRC should be a full
     pathname, in quotes.

     EXINIT is the name of an environment variable that  can
     contain  initialization  commands.  Normally, its value
     is "EXINIT".

-DKEYWORDPRG=_s_t_r_i_n_g
     This  flag  determines  the  default   value   of   the



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9-3                        CFLAGS                        9-3


     "keywordprg" option.  Its value must be a string, so be
     careful about quoting.  The default value of this  flag
     is "ref", which is a C reference program.

-DCC_COMMAND=_s_t_r_i_n_g -DMAKE_COMMAND=_s_t_r_i_n_g -DERRLIST=_s_t_r_i_n_g
     These control the names of the C compiler,  the  "make"
     utility, and the error output file, respectively.  They
     are only used if -DNO_ERRLIST is not given.

     The default value of CC_COMMAND depends on the  Operat-
     ing  System and compiler that you use to compile elvis;
     for UNIX, the default is "cc".  The default  values  of
     MAKE_COMMAND  and  ERRLIST  are  "make"  and "errlist",
     respectively.

-DMAXRCLEN=_n_u_m_b_e_r
     This determines how large a :@  macro  command  can  be
     (measured  in  bytes).   The default is 1000 bytes.  If
     you increase this value  significantly,  then  you  may
     need  to  allocate extra memory for the stack.  See the
     "CHMEM" setting in the Makefile.

-DSHELL=_s_t_r_i_n_g
     This is the default value of the  "shell"  option,  and
     hence  the  default shell used from within Elvis.  This
     only controls the default; the value you give here  may
     be  overridden  at  run-time  by setting an environment
     variable named SHELL  (or  COMSPEC  for  MS-DOS).   Its
     value  must  be  a string constant, so be careful about
     quoting.

-DMAILER=_s_t_r_i_n_g
     This is the name of the program that Elvis uses to send
     mail  to  a  user  whose  text has just been preserved.
     (See the manual page for the _e_l_v_p_r_s_v program.)  If your
     system doesn't use electronic mail, then this option is
     irrelevent.  For UNIX and  OS-9  systems,  though,  the
     value  should be a quoted string.  The default value is
     "mail", but SysV users may prefer to use  "mailx",  and
     BSD users may prefer "Mail".

-DTAGS=_s_t_r_i_n_g
     This sets the name of the "tags" file, which is used by
     the :tag command.  Its value must be a string constant,
     so be careful about quoting.

-DCS_IBMPC -DCS_LATIN1 -DCS_SPECIAL
     The digraph table and  flipcase  option  will  normally
     start  out  empty.   However,  if you add -DCS_IBMPC or
     -DCS_LATIN1 to your CFLAGS, then they  will  start  out
     filled  with values that are appropriate for the IBM PC
     character set or the ISO Latin-1 character set, respec-
     tively.




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9-4                        CFLAGS                        9-4


     You can also use -DCS_IBMPC and  -DCS_SPECIAL  together
     to  get  digraphs that produce the PC's graphic charac-
     ters.

-DDEBUG -DEBUG2
     -DDEBUG adds the ":debug" and ":validate" commands, and
     also   adds   many  internal  consistency  checks.   It
     increases the size of the ".text" segment by about 6K.

     -DDEBUG2 causes a line to be appended to a file  called
     "debug.out"  everytime  any  change is made to the edit
     buffer.

-DCRUNCH
     This flag removes some non-critical code, so that Elvis
     is  smaller.   For example, it removes a short-cut from
     the regexp package, so that text searches  are  slower.
     Also, screen updates are not as efficient.  A couple of
     obscure features are disabled by this, too.

-DNO_MKEXRC
     This removes the ":mkexrc"  command,  so  you  have  to
     create any .exrc files manually.  The size of the .text
     segment will be reduced by about 600 bytes.

-DNO_CHARATTR
     Permanently disables the charattr option.  This reduces
     the size of your ".text" segment by about 850 bytes.

-DNO_RECYCLE
     Normally, Elvis will recycle space (from the  temporary
     file)  which contains totally obsolete text.  This flag
     disables  this  recycling.   Without   recycling,   the
     ".text"  segment is about 1K smaller than it would oth-
     erwise be, but the tmp file grows much faster.  If  you
     have  a  lot of free space on your hard disk, but Elvis
     is too bulky to run with recycling, then try it without
     recycling.

     When using a version of Elvis that  has  been  compiled
     with  -DNO_RECYCLE, you should be careful to avoid mak-
     ing many small changes to a file because  each  indivi-
     dual change will cause the tmp file to grow by at least
     1k.  Hitting "x" thirty times counts as thirty changes,
     but  typing  "30x"  counts  as  one  change.  Also, you
     should occasionally do a ":w" followed  by  a  ":e"  to
     start with a fresh tmp file.

     Interestingly, the real vi never  recycles  space  from
     its temporary file.

-DNO_SENTENCE
     Leaves out the "(" and ")" visual mode commands.  Also,
     the   "[[",  "]]",  "{",  and  "}"  commands  will  not



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9-5                        CFLAGS                        9-5


     recognize *roff macros.  The  sections  and  paragraphs
     options  go  away.   This  saves about 650 bytes in the
     ".text" segment.

-DNO_CHARSEARCH
     Leaves out the visual commands  which  locate  a  given
     character  in the current line: "f", "t", "F", "T", ","
     and ";".  This saves about 900 bytes.

-DNO_EXTENSIONS
     Leaves out the "K" and "#" visual commands.  Also,  the
     arrow  keys will no longer work in input mode.  Regular
     expressions will no longer recognize the \{\} operator.
     (Other  extensions are either inherent in the design of
     Elvis, or are controlled by more specific flags, or are
     too  tiny  to be worth removing.)  This saves about 250
     bytes.

-DNO_MAGIC
     Permanently disables the "magic" option, so  that  most
     meta-characters  in  a  regular  expression  are  *NOT*
     recognized.  This  saves  about  3k  of  space  in  the
     ".text" segment, because the complex regular expression
     code can be replaced by much simpler code.

-DNO_SHOWMODE
     Permanently  disables  the  "showmode"  option,  saving
     about 250 bytes.

-DNO_CURSORSHAPE
     Normally, Elvis tries to adjust the shape of the cursor
     as   a   reminder   of   which  mode  you're  in.   The
     -DNO_CURSORSHAPE flag disables this, saving  about  150
     bytes.

-DNO_DIGRAPH
     To allow entry of non-ASCII characters, Elvis  supports
     digraphs.   A digraph is a single (non-ASCII) character
     which is entered as a combination of two other  (ASCII)
     characters.  If you don't need to input non-ASCII char-
     acters, or if your keyboard supports a  better  way  of
     entering non-ASCII characters, then you can disable the
     digraph code and save about 450 bytes.

-DNO_ERRLIST
     Elvis adds a ":errlist" command,  which  is  useful  to
     programmers.   If  you don't need this feature, you can
     disable it via the -DNO_ERRLIST flag.  This will reduce
     the .text segment by about 900 bytes, and the .bss seg-
     ment by about 300 bytes.

-DNO_ABBR
     The -DNO_ABBR flag disables the  ":abbr"  command,  and
     reduces the size of Elvis by about 250 bytes.



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9-6                        CFLAGS                        9-6


-DNO_OPTCOLS
     When Elvis displays the current  options  settings  via
     the  ":set"  command,  the  options are normally sorted
     into columns.  The -DNO_OPTCOLS flag causes the options
     to be sorted across the rows, which is much simpler for
     the computer.  The -DNO_OPTCOLS flag  will  reduce  the
     size of your .text segment by about 500 bytes.

-DNO_MODELINES
     This removes all support for modelines.

-DNO_TAG
     This disables tag lookup.  It reduces the size  of  the
     .text segment by about 750 bytes.

-DNO_ALT_FKEY -DNO_CTRL_FKEY -DNO_SHIFT_FKEY -DNO_FKEY
     These remove explicit  support  of  function  keys.   -
     DNO_ALT_FKEY  removes  support for the <alternate> ver-
     sions function keys.   -DNO_CTRL_FKEY  removes  support
     for  the  <control>  and  <alternate> versions function
     keys.  -DNO_SHIFT_FKEY removes support for the <shift>,
     <control>,  and  <alternate> versions function keys.  -
     DNO_FKEY removes all support of function keys.

     Elvis's ":map" command normally allows you to  use  the
     special  sequence  "#<n>" to map function key <n>.  For
     example, ":map #1 {!}fmt^M" will cause the <F1> key  to
     reformat  a paragraph.  Elvis checks the :k1=: field in
     the termcap description of your terminal to figure  out
     what  code  is  sent  by  the  <F1> key.  This is handy
     because it allows you to create a .exrc file which maps
     function  keys  the same way regardless of what type of
     terminal you use.

     That behaviour is standard; most implementations of the
     real  vi  supports it too.  Elvis extends this to allow
     you to use "#1s" to refer  to  <shift>+<F1>,  "#1c"  to
     refer   to   <control>+<F1>,  and  "#1a"  to  refer  to
     <alt>+<F1>.  The termcap description for  the  terminal
     should have fields named :s1=:c1=:a1=: respectively, to
     define the code sent by these key  conbinations.   (You
     should  also  have  :k2=:s2=:c2=:a2=: for the <F2> key,
     and so on.)

     But there  may  be  problems.   The  terminfo  database
     doesn't  support :s1=:c1=:a1=:, so no terminfo terminal
     description could ever support shift/control/alt  func-
     tion  keys; so you might as well add -DNO_SHIFT_FKEY to
     CFLAGS if you're using terminfo.

     Note that, even if you have -DNO_FKEYS, you  can  still
     configure  Elvis  to  use your function keys my mapping
     the literal character codes sent by the key.  You  just
     couldn't do it in a terminal-independent way.  TERM_925



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9-7                        CFLAGS                        9-7


-DTERM_AMIGA -DTERM_VT100 -DTERM_VT52 etc.
     The tinytcap.c file contains  descriptions  of  several
     terminal  types.  For each system that uses tinytcap, a
     reasonable subset  of  the  available  descriptions  is
     actually  compiled  into Elvis.  If you wish to enlarge
     this  subset,  then  you  can   add   the   appropriate
     -DTERM_XXX flag to your CFLAGS settings.

     For a list of the available terminal types,  check  the
     tinytcap.c file.

-DINTERNAL_TAGS
     Normally, Elvis uses the "ref" program to  perform  tag
     lookup.   This  is more powerful than the real vi's tag
     lookup, but it can be much slower.

     If you add -DINTERNAL_TAGS to your CFLAGS setting, then
     Elvis  will use its own internal tag lookup code, which
     is faster.

-DPRSVDIR=_d_i_r_e_c_t_o_r_y
     This controls where preserved files will be placed.  An
     appropriate  default has been chosen for each Operating
     System, so you probably don't need to worry about it.

-DFILEPERMS=_n_u_m_b_e_r
     This affects the attributes of files that  are  created
     by  Elvis;  it  is  used  as the second argument to the
     creat() function.  The default is 0666 which  (on  UNIX
     systems  at least) means that anybody can read or write
     the new file, but nobody can execute it.  On UNIX  sys-
     tems, the creat() call modifies this via the umask set-
     ting.

-DKEYBUFSIZE=_n_u_m_b_e_r
     This determines the size of the type-ahead buffer  that
     elvis uses.  It also limits the size of keymaps that it
     can handle.  The  default  is  1000  characters,  which
     should be plenty.


















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