AT&T UNIX™PC Unix System V Users Manual - tenox

CPP ( 1 )
CPP (1)
the C language. There is also a unary operator defined,
which can be used in constant-expression in these two
forms: defined ( name ) or defined name . This allows
the utility of #ifdef and #ifndef in a #if directive.
Only these operators, integer constants, and names which
are known by cpp should be used in constant-expression .
In particular, the sizeof operator is not available.
#else Reverses the notion of the test directive which matches
this directive. So if lines previous to this directive are
ignored, the following lines will appear in the output.
And vice versa.
The test directives and the possible #else directives can be
nested.
FILES
fusr/include
standard directory for #include files
SEE ALSO
cc(l), m4( 1).
DIAGNOSTICS
The error messages produced by cpp are intended to be selfexplanatory.
The line number and filename where the error
occurred are printed along with the diagnostic.
NOTES
When newline characters were found in argument lists for macros
to be expanded, previous versions of cpp put out the newlines as
they were found and expanded. The current version of cpp
replaces these newlines with blanks to alleviate problems that the
previous versions had when this occurred.
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