What does double colon mean in makefile?
Double-colon rules are rules written with ‘::’ instead of ‘:’ after the target names. They are handled differently from ordinary rules when the same target appears in more than one rule. When a target appears in multiple rules, all the rules must be the same type: all ordinary, or all double-colon.
What does := mean in makefile?
“:=” is for defining simply expanded variable, which is expanded once and for all. The following make file will print out “y is foo bar” x := foo y := $(x) bar x := later all:;echo “y is” $(y) Also, as other people pointed earlier, you can get more details in Using Variables section of the GNU make manual.
How do you write a double-colon?
Double-colon rules are explicit rules written with ‘ :: ‘ instead of ‘ : ‘ after the target names. They are handled differently from ordinary rules when the same target appears in more than one rule. Pattern rules with double-colons have an entirely different meaning (see Match-Anything Rules).
How do you use a double-colon?
A colon can be used to separate two independent clauses when a) the second clause is directly related to the first clause (not just vaguely related) and b) when the emphasis is on the second clause.
How do I create a variable in makefile?
How to Use Variables
- A variable is a name defined in a makefile to represent a string of text, called the variable’s value.
- To substitute a variable’s value, write a dollar sign followed by the name of the variable in parentheses or braces: either `$(foo)’ or `${foo}’ is a valid reference to the variable foo .
What is Makedepend?
makedepend is a Unix tool used to generate dependencies of C source files. A Microsoft Windows version was made available in 2002 and last updated in 2007 on UnxUtils.
What does double-colon mean?
The double colon ( :: ) may refer to: an analogy symbolism operator, in logic and mathematics. a notation for equality of ratios. a scope resolution operator, in computer programming languages.