Follow Techotopia on Twitter

On-line Guides
All Guides
eBook Store
iOS / Android
Linux for Beginners
Office Productivity
Linux Installation
Linux Security
Linux Utilities
Linux Virtualization
Linux Kernel
System/Network Admin
Scripting Languages
Development Tools
Web Development
GUI Toolkits/Desktop
Mail Systems
Eclipse Documentation

How To Guides
General System Admin
Linux Security
Linux Filesystems
Web Servers
Graphics & Desktop
PC Hardware
Problem Solutions
Privacy Policy




[ < ] [ > ]   [ << ] [ Up ] [ >> ]         [Top] [Contents] [Index] [ ? ]

10.5 Defining and Redefining Pattern Rules

You define an implicit rule by writing a pattern rule. A pattern rule looks like an ordinary rule, except that its target contains the character `%' (exactly one of them). The target is considered a pattern for matching file names; the `%' can match any nonempty substring, while other characters match only themselves. The prerequisites likewise use `%' to show how their names relate to the target name.

Thus, a pattern rule `%.o : %.c' says how to make any file `stem.o' from another file `stem.c'.

Note that expansion using `%' in pattern rules occurs after any variable or function expansions, which take place when the makefile is read. See section How to Use Variables, and Functions for Transforming Text.

10.5.1 Introduction to Pattern Rules  An introduction to pattern rules.
10.5.2 Pattern Rule Examples  Examples of pattern rules.
10.5.3 Automatic Variables  How to use automatic variables in the commands of implicit rules.
10.5.4 How Patterns Match  How patterns match.
10.5.5 Match-Anything Pattern Rules  Precautions you should take prior to defining rules that can match any target file whatever.
10.5.6 Canceling Implicit Rules  How to override or cancel built-in rules.

  Published under the terms of the GNU General Public License Design by Interspire