Re: about :: sign and % sign problems

[Lin George]

Thanks Paul!

 

 

Cool answer! :-)

Do you also know the difference between :: and :? I can not understand what related parts of GNU make manual is talking about and there is also no samples in the manual dealing with this point.

 

 

regards,

George

"Paul D. Smith" <address@hidden> wrote:

%% John Graham-Cumming writes:

>> Another question, ";" means do nothing, why sometimes we still add some
>> commands after ;? (I mean, if do nothing, we should not add any commands
>> after ";").

jg> No, ; doesn't mean do nothing. ; means after this semicolon are
jg> commands that should be executed for this rule. If there are no
jg> commands then there are no commands to execute.

Put another way, this:

foo: ; echo foo

is just another way to write this:

foo:
echo foo

and so this:

foo: ;

is just another way to write this:

foo:


(an empty command)

--
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Paul D. Smith Find some GNU make tips at:
http://www.gnu.org http://make.paulandlesley.org
"Please remain calm...I may be mad, but I am a professional." --Mad Scientist

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