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What is the difference between “make” and “make all”?

2014-01-22 16:07 633 查看

I have a Makefile with the following structure (working example).

.PHONY: image flashcard put-files

put-files:
@echo "=== put-files"

image:
@echo "=== image"

flashcard:
@echo "=== flashcard"

all: put-files image flashcard
@echo "Done"

I expect that a simple

make

would build all three targets, but this is not so:

% make
=== put-files

But if I explicitly specify the target, the dependencies are built as well:

% make all
=== put-files
=== image
=== flashcard
Done

What am I doing wrong?

makefile

gnu-make

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edited
Jul 28 '11 at 8:51

asked
Jul 28 '11 at 8:44

Dave Vogt

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1 Answer

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A simple

make

will build the first target in the list, which is

put-files

make all

will build the target

all

. If you want

all

to be the default, then move it to the top of the list.

To understand what the

.PHONY

does, see http://www.gnu.org/s/hello/manual/make/Phony-Targets.html

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