UNIFDEF(1) General Commands Manual UNIFDEF(1)
unifdef - resolve and remove ifdef'ed lines from cpp input
unifdef [ -c l t ] [ -Dname ] [ -Uname ] [ -iDname ] [ -iUname ] ... [
unifdef removes ifdefed lines from a file while otherwise leaving the
file alone. It is smart enough to deal with the nested ifdefs, com-
ments, single and double quotes of C syntax, but it does not do any
including or interpretation of macros. Neither does it strip out com-
ments, though it recognizes and ignores them. You specify which sym-
bols you want defined with -D options, and which you want undefined
with -U options. Lines within those ifdefs will be copied to the out-
put, or removed, as appropriate. Any ifdef, ifndef, else, and endif
lines associated with filename will also be removed.
ifdefs involving symbols you do not specify are untouched and copied
out along with their associated ifdef, else, and endif lines.
If an ifdefX occurs nested inside another ifdefX, then the inside ifdef
is treated as if it were an unrecognized symbol. If the same symbol
appears in more than one argument, only the first occurrence is signif-
unifdef copies its output to the standard output and will take its
input from the standard input if no filename argument is given.
-c Complement the normal operation. Lines that would have been
removed or blanked are retained, and vice versa.
-l Replace "lines removed" lines with blank lines.
-t Plain text option. unifdef refrains from attempting to recog-
nize comments and single and double quotes.
Ignore, but print out, lines associated with the defined symbol
filename. If you use ifdefs to delimit non-C lines, such as
comments or code which is under construction, then you must tell
unifdef which symbols are used for that purpose so that it won't
try to parse for quotes and comments within them.
Ignore, but print out, lines associated with the undefined sym-
Inappropriate else or endif.
Exit status is 0 if output is exact copy of input, 1 if not, 2 if trou-
Does not know how to deal with cpp(1) constructs such as
#if defined(X) || defined(Y)
9 September 1987 UNIFDEF(1)