You can cause the compiler to increment line numbers during
compilation from a number specified in a line control directive.
(The resulting line numbers appear in error message references,
but do not alter the line numbers of the actual source code.)
Syntax |
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line-directive ::=
#line digit-sequence [filename]
Description |
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The #line preprocessing directive causes the compiler to
treat lines following it in the program as if the name of the source
file were filename and the current line number
is digit-sequence. This is to control the file
name and line number that is given in diagnostic messages, for example.
This feature is used primarily for preprocessor programs that generate
C code. It enables them to force the HP C compiler to produce diagnostic
messages with respect to the source code that is input to the preprocessor
rather than the C source code that is output and subsequently input
to the compiler.
HP C defines two macros that you can use for error diagnostics.
The first is __LINE__, an integer constant equal to the value of the
current line number. The second is __FILE__, a quoted string literal equal to the name of
the input source file. Note that you can change
__FILE__ and __LINE__ using #include or #line directives.
Example |
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#line digit-sequence [filename]: #line 5 "myfile"
