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<li class="toctree-l1 current"><a class="current reference internal" href="#">5. Nix-style Local Builds</a><ul>
<li class="toctree-l2"><a class="reference internal" href="nix-local-build.html">5.1. Quickstart</a></li>
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<div class="section" id="nix-style-local-builds">
<h1>5. Nix-style Local Builds<a class="headerlink" href="#nix-style-local-builds" title="Permalink to this headline">¶</a></h1>
<p>Nix-style local builds are a new build system implementation inspired by Nix.
The Nix-style local build system is commonly called “new-build” for short after the <code class="docutils literal"><span class="pre">cabal</span> <span class="pre">new-*</span></code> family of commands that control it.
However those names are only temporary until Nix-style local builds becomes the default.</p>
<p>Nix-style local builds combine the best of non-sandboxed and sandboxed Cabal:</p>
<ol class="arabic simple">
<li>Like sandboxed Cabal today, we build sets of independent local
packages deterministically and independent of any global state.
new-build will never tell you that it can’t build your package
because it would result in a “dangerous reinstall.” Given a
particular state of the Hackage index, your build is completely
reproducible. For example, you no longer need to compile packages
with profiling ahead of time; just request profiling and new-build
will rebuild all its dependencies with profiling automatically.</li>
<li>Like non-sandboxed Cabal today, builds of external packages are
cached in <code class="docutils literal"><span class="pre">~/.cabal/store</span></code>, so that a package can be built once,
and then reused anywhere else it is also used. No need to continually
rebuild dependencies whenever you make a new sandbox: dependencies
which can be shared, are shared.</li>
</ol>
<p>Nix-style local builds were first released as beta in cabal-install 1.24.
They currently work with all versions of GHC supported by that release: GHC 7.0 and later.</p>
<p>Some features described in this manual are not implemented. If you need
them, please give us a shout and we’ll prioritize accordingly.</p>
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<li class="toctree-l1"><a class="reference internal" href="nix-local-build.html">5.1. Quickstart</a><ul>
<li class="toctree-l2"><a class="reference internal" href="nix-local-build.html#developing-multiple-packages">5.1.1. Developing multiple packages</a></li>
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<li class="toctree-l1"><a class="reference internal" href="nix-local-build.html#cookbook">5.2. Cookbook</a><ul>
<li class="toctree-l2"><a class="reference internal" href="nix-local-build.html#how-can-i-profile-my-library-application">5.2.1. How can I profile my library/application?</a></li>
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<li class="toctree-l1"><a class="reference internal" href="nix-local-build.html#how-it-works">5.3. How it works</a><ul>
<li class="toctree-l2"><a class="reference internal" href="nix-local-build.html#local-versus-external-packages">5.3.1. Local versus external packages</a></li>
<li class="toctree-l2"><a class="reference internal" href="nix-local-build.html#where-are-my-build-products">5.3.2. Where are my build products?</a></li>
<li class="toctree-l2"><a class="reference internal" href="nix-local-build.html#caching">5.3.3. Caching</a></li>
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<li class="toctree-l1"><a class="reference internal" href="nix-local-build.html#commands">5.4. Commands</a><ul>
<li class="toctree-l2"><a class="reference internal" href="nix-local-build.html#cabal-new-configure">5.4.1. cabal new-configure</a></li>
<li class="toctree-l2"><a class="reference internal" href="nix-local-build.html#cabal-new-build">5.4.2. cabal new-build</a></li>
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<li class="toctree-l2"><a class="reference internal" href="nix-local-build.html#cabal-new-freeze">5.4.4. cabal new-freeze</a></li>
<li class="toctree-l2"><a class="reference internal" href="nix-local-build.html#unsupported-commands">5.4.5. Unsupported commands</a></li>
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<li class="toctree-l1"><a class="reference internal" href="nix-local-build.html#configuring-builds-with-cabal-project">5.5. Configuring builds with cabal.project</a><ul>
<li class="toctree-l2"><a class="reference internal" href="nix-local-build.html#specifying-the-local-packages">5.5.1. Specifying the local packages</a></li>
<li class="toctree-l2"><a class="reference internal" href="nix-local-build.html#global-configuration-options">5.5.2. Global configuration options</a></li>
<li class="toctree-l2"><a class="reference internal" href="nix-local-build.html#solver-configuration-options">5.5.3. Solver configuration options</a></li>
<li class="toctree-l2"><a class="reference internal" href="nix-local-build.html#package-configuration-options">5.5.4. Package configuration options</a><ul>
<li class="toctree-l3"><a class="reference internal" href="nix-local-build.html#object-code-options">5.5.4.1. Object code options</a></li>
<li class="toctree-l3"><a class="reference internal" href="nix-local-build.html#executable-options">5.5.4.2. Executable options</a></li>
<li class="toctree-l3"><a class="reference internal" href="nix-local-build.html#dynamic-linking-options">5.5.4.3. Dynamic linking options</a></li>
<li class="toctree-l3"><a class="reference internal" href="nix-local-build.html#foreign-function-interface-options">5.5.4.4. Foreign function interface options</a></li>
<li class="toctree-l3"><a class="reference internal" href="nix-local-build.html#profiling-options">5.5.4.5. Profiling options</a></li>
<li class="toctree-l3"><a class="reference internal" href="nix-local-build.html#coverage-options">5.5.4.6. Coverage options</a></li>
<li class="toctree-l3"><a class="reference internal" href="nix-local-build.html#haddock-options">5.5.4.7. Haddock options</a></li>
</ul>
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<li class="toctree-l2"><a class="reference internal" href="nix-local-build.html#advanced-global-configuration-options">5.5.5. Advanced global configuration options</a><ul>
<li class="toctree-l3"><a class="reference internal" href="nix-local-build.html#advanced-solver-options">5.5.5.1. Advanced solver options</a></li>
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