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What do @, - and + do as prefixes to recipe lines in Make?

...cuted. - means ignore the exit status of the command that is executed (normally, a non-zero exit status would stop that part of the build). + means 'execute this command under make -n' (or 'make -t' or 'make -q') when commands are not normally executed. See also the POSIX specification for make and ...
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What does gcc's ffast-math actually do?

...tside of IEEE standards, but I can't seem to find information on what is really happening when it's on. Can anyone please explain some of the details and maybe give a clear example of how something would change if the flag was on or off? ...
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Change directory command in Docker?

... && \ rm -f treeio.zip && cd treeio && pip install -r requirements.pip Because of the use of '&&', it will only get to the final 'pip install' command if all the previous commands have succeeded. In fact, since every RUN creates a new commit & (currently) a...
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Git merge left HEAD marks in my files

...ess of merging, but there were some parts that Git couldn't merge automatically. You'll need to hand-edit those parts to what you want them to be and then commit the results. For instance, in your particular case, you'd probably want to resolve it like this (note - the arrows/text on the right ar...
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Gson custom seralizer for one variable (of many) in an object using TypeAdapter

...a great question because it isolates something that should be easy but actually requires a lot of code. To start off, write an abstract TypeAdapterFactory that gives you hooks to modify the outgoing data. This example uses a new API in Gson 2.2 called getDelegateAdapter() that allows you to look up...
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Can you give a Django app a verbose name for use throughout the admin?

...h to the appropriate AppConfig subclass to be configured explicitly in INSTALLED_APPS. Example: INSTALLED_APPS = [ # ...snip... 'yourapp.apps.YourAppConfig', ] Then alter your AppConfig as listed below. Django 1.7 As stated by rhunwicks' comment to OP, this is now possible out of the ...
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Abstract classes in Swift Language

... importantly, notice that there is no dynamic dispatch. When logSalary is called on the instance that is stored as a SoftwareEngineer it calls the overridden version of the method. When logSalary is called on the instance after it has been cast to an Employee, it calls the original implementation (i...
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How to do a newline in output

How do I make \n actually work in my output? At the moment it just writes it all in 1 long block. Thanks for any help 4 A...
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Assign same value to multiple variables at once?

... @Eoin: In doing $var_a = $var_b = ... = new Class();, all the variables will reference the same instance of Class. – Tim Cooper Jun 21 '19 at 19:34 ...
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Can I underline text in an Android layout?

... sometimes if you are using a custom font. However, underlying programmatically by UnderlineSpan has yet to fail on me, so I would recommend it as the most reliable solution. – Giulio Piancastelli Apr 2 '14 at 18:17 ...