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| [9] | 1 | .TH IFDEF 1
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| 2 | .SH NAME
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| 3 | ifdef \- remove #ifdefs from a file
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| 4 | .SH SYNOPSIS
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| 5 | \fBifdef \fR[\fB\-t\fR] [\fB\-d\fIsymbol\fR] [\fB\-D\fIsymbol\fR] [\fB\-U\fIsymbol\fR] [\fB\-I\fIsymbol\fR] [file]\fR
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| 6 | .br
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| 7 | .de FL
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| 8 | .TP
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| 9 | \\fB\\$1\\fR
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| 10 | \\$2
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| 11 | ..
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| 12 | .de EX
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| 13 | .TP 20
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| 14 | \\fB\\$1\\fR
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| 15 | # \\$2
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| 16 | ..
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| 17 | .SH OPTIONS
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| 18 | .FL "\-D" "Define symbol permanently"
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| 19 | .FL "\-I" "Ignore symbol"
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| 20 | .FL "\-U" "Undefine symbol permanently"
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| 21 | .FL "\-d" "Define symbol. It may be #undef'ed later"
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| 22 | .FL "\-t" "Produce a table of the symbols on \fIstdout\fR"
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| 23 | .SH EXAMPLES
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| 24 | .EX "ifdef \-DUNIX file.c >newfile.c" "Define \fIUNIX\fR"
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| 25 | .EX "ifdef \-D_MINIX \-UDOS <x.c >y.c "Define \fI_MINIX\fR, undefine \fIDOS\fR"
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| 26 | .SH DESCRIPTION
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| 27 | .PP
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| 28 | \fIIfdef\fR
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| 29 | allows conditional code [ #ifdef ... #endif ]
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| 30 | to be selectively removed from C files, but at the same time leaving
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| 31 | all other C preprocessor commands intact such as #define, #include etc.
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| 32 | Input to
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| 33 | .I ifdef
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| 34 | is either the file named as the last argument, or \fIstdin\fR if no file
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| 35 | is named.
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| 36 | Output goes to \fIstdout\fR.
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| 37 | .PP
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| 38 | Symbols may be defined with the \fB\-d\fR or \fB\-D\fR flags just like
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| 39 | \fIcpp\fR, except that the latter option ignores subsequent \fI#undefs\fR.
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| 40 | It is not permitted to give values to symbols.
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| 41 | Similarly, \fB\-U\fR undefines a symbol and ignores subsequent
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| 42 | \fI#defines\fRs.
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| 43 | Symbols defined with \fB\-I\fR are ignored; any \fI#ifdef\fR using an
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| 44 | ignored symbol will be left intact.
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