59 lines
1.4 KiB
Groff
59 lines
1.4 KiB
Groff
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.TH IFDEF 1
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.SH NAME
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ifdef \- remove #ifdefs from a file
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.SH SYNOPSIS
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\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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.br
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.de FL
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.TP
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\\fB\\$1\\fR
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\\$2
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..
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.de EX
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.TP 20
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\\fB\\$1\\fR
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# \\$2
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..
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.SH OPTIONS
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.TP 5
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.B \-D
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# Define symbol permanently
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.TP 5
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.B \-I
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# Ignore symbol
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.TP 5
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.B \-U
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# Undefine symbol permanently
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.TP 5
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.B \-d
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# Define symbol. It may be #undef'ed later
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.TP 5
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.B \-t
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# Produce a table of the symbols on \fIstdout\fR
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.SH EXAMPLES
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.TP 20
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.B ifdef \-DUNIX file.c >newfile.c
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# Define \fIUNIX\fR
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.TP 20
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.B ifdef \-D_MINIX \-UDOS <x.c >y.c
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# Define \fI_MINIX\fR, undefine \fIDOS\fR
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.SH DESCRIPTION
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.PP
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\fIIfdef\fR
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allows conditional code [ #ifdef ... #endif ]
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to be selectively removed from C files, but at the same time leaving
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all other C preprocessor commands intact such as #define, #include etc.
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Input to
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.I ifdef
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is either the file named as the last argument, or \fIstdin\fR if no file
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is named.
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Output goes to \fIstdout\fR.
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.PP
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Symbols may be defined with the \fB\-d\fR or \fB\-D\fR flags just like
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\fIcpp\fR, except that the latter option ignores subsequent \fI#undefs\fR.
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It is not permitted to give values to symbols.
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Similarly, \fB\-U\fR undefines a symbol and ignores subsequent
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\fI#defines\fRs.
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Symbols defined with \fB\-I\fR are ignored; any \fI#ifdef\fR using an
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ignored symbol will be left intact.
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