Menu
Gnu Makefile shows two symbols for immediate expansion, as follows:
immediate := immediate
immediate ::= immediate
Is there a difference between these two?
reference: gnu makefile manual section 3.7
225
":=" is for defining simply expanded variable, which is expanded once and for all.
= operator assigns a value either as a part of the SET statement or as a part of the SET clause in an UPDATE statement, in any other case = operator is interpreted as a comparison operator. On the other hand, := operator assigns a value and it is never interpreted as a comparison operator.
In Go, := is for declaration + assignment, whereas = is for assignment only. For example, var foo int = 10 is the same as foo := 10 .
From section 6.2:
Simply expanded variables are defined by lines using ‘:=’ or ‘::=’ (see Setting Variables). Both forms are equivalent in GNU make; however only the ‘::=’ form is described by the POSIX standard (support for ‘::=’ was added to the POSIX standard in 2012, so older versions of make won’t accept this form either).
60
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
