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5.2 Recipe Echoing
Normally make
prints each line of the recipe before it is
executed. We call this echoing because it gives the appearance
that you are typing the lines yourself.
When a line starts with ‘@’, the echoing of that line is suppressed.
The ‘@’ is discarded before the line is passed to the shell.
Typically you would use this for a command whose only effect is to print
something, such as an echo
command to indicate progress through
the makefile:
@echo About to make distribution files
When make
is given the flag ‘-n’ or ‘--just-print’ it
only echoes most recipes, without executing them. See section Summary of Options. In this case even the recipe lines
starting with ‘@’ are printed. This flag is useful for finding
out which recipes make
thinks are necessary without actually
doing them.
The ‘-s’ or ‘--silent’
flag to make
prevents all echoing, as if all recipes
started with ‘@’. A rule in the makefile for the special target
.SILENT
without prerequisites has the same effect
(see section Special Built-in Target Names).
.SILENT
is essentially obsolete since ‘@’ is more flexible.
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