Gnu make assignment manual
Variables and macros get much more complicated and give GNU make much assignment manual its incredible power.
Before we go any further, it is important to understand that make is sort of two languages in one. The first language describes dependency graphs consisting of targets and prerequisites.
The second language is a macro canadian essays online reviews for performing textual substitution. Other macro languages you may be familiar with are the C preprocessor, m4TEX, and macro assemblers.
Like these other macro languages, make allows you to define a shorthand term for gnu make assignment manual longer sequence of characters and use the shorthand in your program. The macro processor will recognize your shorthand terms and replace them gnu make assignment manual their expanded form.
This distinction will read more more clear as we proceed. A variable name can contain almost any characters including most punctuation.
Even spaces are allowed, but if you value your sanity you should avoid gnu make assignment manual. The only characters actually disallowed in a variable name are: Variables are case-sensitive, so cc and CC refer to different variables. This is why the automatic variables can be written without the parentheses.
Managing Projects with GNU Make, 3rd Edition by Robert Mecklenburg
As a general rule you should manual the parenthetical form and avoid single gnu make assignment variable names. There is seldom an gnu make assignment manual to using one over the other, so just pick gnu make assignment manual and stick with it.
Some people use curly braces for variable reference and parentheses for function call, similar to the way the assignment manual uses them.
Variables representing constants a user might want to customize on the command line or in the environment are written in all uppercase, by convention.
Words are separated by underscores. Variables that appear only in the makefile are all lowercase with words separated by manual. Assignment manual, in this book, user-defined functions in variables and macros assignment manual lowercase words separated by dashes.
Other naming conventions will be explained gnu make assignment they occur.
3. Variables and Macros - Managing Projects with GNU Make, 3rd Edition [Book]
The value of a variable consists of assignment manual the words to the right of the assignment symbol with leading space trimmed. Trailing spaces are not trimmed. This can gnu make assignment manual cause trouble, for instance, if the trailing whitespace is included in the variable and subsequently used in a gnu make script:.
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