The Source Integrity Professional Edition User Guide - MKS

Using the MKS Make Utility
runtime macro), however, serve a useful function when used in
prerequisite lists; they can refer to the associated target’s name (in
full, or in part).
Control Macros
MKS Make groups control macros into two sets: string-valued macros
and attribute macros.
MKS Make automatically creates internally defined macros. For
example, you can use $(PWD) to expand to the name of the present
working directory.
The following table describes some of the most useful string valued
macros. For a complete list, see the online command reference for the
make command.
Macro Description
DIRSEPSTR Defined internally, provides the characters that you can
use to separate components in a path name.
On UNIX and POSIX systems, this macro simply contains
the slash character (/).
On Windows 95/NT, and OS/2 systems, the startup.mk
file redefines DIRSEPSTR, according to the value you
specify for your SHELL environment variable. If the SHELL
variable is undefined, and COMSPEC is set, then the startup
file redefines DIRSEPSTR to contain a backslash, a
forward slash, and a colon (\/:). If you run MKS Make
with -r (so startup.mk is not read), or if SHELL is
defined, or if both SHELL and COMSPEC are undefined,
then the DIRSEPSTR special macro contains a string
consisting of forward slash, a backslash, and a colon (/
\:). If MKS Make finds it necessary to make a path name,
it uses the first character of DIRSEPSTR to separate path
name components.
NULL Defined internally, expands to an empty string. Use this for
comparisons in conditional expressions, and in
constructing metarules without ambiguity.
For more information, see “Using Inference Rules” on
page 281.
OS Defined internally, expands to the name of the operating
system.
OSVERSION Defined internally, expands to a string giving the major
version of your current operating system.
272 Source Integrity Professional Edition