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Abort makefile if variable not set

...))$(if $(value @), \ required by target `$@'))) So that, now a failed check produces a nicely formatted output: Makefile:7: *** Undefined BAR (baz value) required by target `foo'. Stop. check-defined-MY_FLAG special target Personally I would use the simple and straightforward ...
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jQuery - get a list of values of an attribute from elements of a class

...Attribute(attributeName)); }); return results; } }); Now you can get the list of level values by calling: $(".object").attrs("level") share | improve this answer | ...
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Why is git push gerrit HEAD:refs/for/master used instead of git push origin master

I've just started using gerrit and I want to know why we need to do git push gerrit HEAD:refs/for/master instead of doing git push origin master ...
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Current time formatting with Javascript

...this time - over four years after first answers to this question - this is now the most convenient and flexible solution, and answer to this question. It should be promoted higher as an example of current (AD 2018) practice :-) – Jochem Schulenklopper Apr 25 '1...
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Animate the transition between fragments

...ally slides involve animating content to and from off-screen. As far as I know there aren't any transition properties that use relative values. However, this doesn't prevent you from writing them yourself. Remember that property animations simply require getter and setter methods on the objects you'...
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C++, Free-Store vs Heap

...e-store , while malloc/free operations use the heap . I'd like to know if there is an actual difference, in practice. Do compilers make a distinction between the two terms? ( Free store and Heap , not new/malloc ) ...
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Fastest way to remove first char in a String

...as actually becoming a problem for you - in which case the only way you'd know would be to have test cases, and then it's easy to just run those test cases for each option and compare the results. I'd expect Substring to probably be the fastest here, simply because Substring always ends up creating ...
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Can you pass parameters to an AngularJS controller on creation?

...e. Soon you'll want to re-use that template, but with different config and now in order to do so you'll either be pre-processing the templates to inject variables before it gets passed to angular or using massive directives to spit out giant blocks of HTML so you re-use all of the controller HTML ex...
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Adding a cross-reference to a subheading or anchor in another page

...through github. You have to link to the final HTML file and you have to know what the id given to the section will be. If you want to do the same for a file served through github: `This <other.rst#section>`__ is a reference to a section in another file, which works on github. Unfortunately,...
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How do browser cookie domains work?

Due to weird domain/subdomain cookie issues that I'm getting, I'd like to know how browsers handle cookies. If they do it in different ways, it would also be nice to know the differences. ...