Linux in a Nutshell, Fifth Edition

make | 279

Linux

Commands

This is the Title of the Book, eMatter Edition

Copyright © 2006 O’Reilly & Associates, Inc. All rights reserved.

$(foreach variable,list,string)

For each whitespace-separated word in list, expand its value

and assign it to variable; then expand string, which usually

contains a function referencing variable. Return the list of

results.

$(if condition,then-string[,else-string])

Expand string condition if it expands to a nonempty string,

then expand the then-string.Ifcondition expands to an empty

string, return the empty string or, if specified, expand and

return the else-string.

$(call variable,parameters)

Expand each item in comma-separated list parameters and

assign it to a temporary variable, $(n), where n is an incre-

mented number beginning with 0. Then expand variable,a

string referencing these temporary variables, and return the

result.

$(origin variable)

Return one of the following strings that describes how vari-

able was defined: undefined, default, environment,

environment override, file, command line, override,or

automatic.

$(shell command)

Return the results of command. Any newlines in the result are

converted to spaces. This function works similarly to back-

quotes in most shells.

$(error string)

When evaluated, generate a fatal error with the message string.

$(warning string)

When evaluated, generate a warning with the message string.

Macro string substitution

$(macro:s1=s2 ...