HP 3000 Manuals HP 3000 Manuals
Line Control
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
line-directive ::=
#line digit-sequence [filename]
Description
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 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.
The compiler 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
#line digit-sequence [filename]: #line 5 "myfile"