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copied!<p>They control the behaviour of make for the tagged command lines:</p> <ul> <li><p><code>@</code> suppresses the normal 'echo' of the command that is executed.</p></li> <li><p><code>-</code> means ignore the exit status of the command that is executed (normally, a non-zero exit status would stop that part of the build).</p></li> <li><p><code>+</code> means 'execute this command under <code>make -n</code>' (or 'make -t' or 'make -q') when commands are not normally executed. See also the POSIX specification for <a href="http://pubs.opengroup.org/onlinepubs/9699919799/utilities/make.html" rel="noreferrer"><code>make</code></a> and also <a href="https://www.gnu.org/software/make/manual/html_node/Instead-of-Execution.html#Instead-of-Execution" rel="noreferrer">§9.3</a> of the GNU Make manual.</p></li> </ul> <p>The <code>+</code> notation is a (POSIX-standardized) generalization of the <em>de facto</em> (non-standardized) mechanism whereby a command line containing <code>${MAKE}</code> or <code>$(MAKE)</code> is executed under <code>make -n</code>.</p> <p>(<code>@</code> is discussed in <a href="https://www.gnu.org/software/make/manual/make.html#Recipe-Echoing" rel="noreferrer">§5.2</a> of the GNU Make manual; <code>-</code> is described in <a href="https://www.gnu.org/software/make/manual/make.html#Errors-in-Recipes" rel="noreferrer">§5.5</a>; and <a href="https://www.gnu.org/software/make/manual/make.html#How-the-MAKE-Variable-Works" rel="noreferrer">§5.7.1</a> mentions the use of <code>+</code>.)</p>

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