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<h3>
Marge Bot pushed to branch master
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
</h3>
<h4>
Commits:
</h4>
<ul>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/commit/20b4d5ecabc59062b7a841ce20b631364d8f8645">20b4d5ec</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-16T03:32:38Z</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Disable optimisation when building Cabal lib for stage0
This disables optimisation when building Cabal for Hadrian and
stage0 `ghc-cabal`. Cabal is performance critical in neither case nor
will any performance difference here be visible to the end-user.
See #16817.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/commit/76b7f619385ac5d126dd186ff3bfe4cdad9349e7">76b7f619</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-16T03:32:38Z</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Disable optimisation when building Cabal in development flavours
This updates the make and Hadrian build flavours targetting developers
to disable optimisation when building the Cabal library. Cabal tends to
tickle some very bad compiler performance cases (e.g. #16577) so
disabling optimisation here makes a sizeable impact on overall build
time.
See #16817.
</pre>
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<h4>6 changed files:</h4>
<ul>
<li class="file-stats">
<a href="#5b653ef3b00262d0f1454de11e0714bd59d072e5">
hadrian/cabal.project
</a>
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<li class="file-stats">
<a href="#6d5bb3f66af29932d469deefe0f4351faf14a304">
hadrian/src/Settings/Flavours/Development.hs
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<li class="file-stats">
<a href="#eda903e01cf88e7ce73a341d5fc0bb4d12470b60">
mk/flavours/devel1.mk
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<li class="file-stats">
<a href="#617f322f762edbe7d7ca48ebfaea08450b81d6a9">
mk/flavours/devel2.mk
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<li class="file-stats">
<a href="#0eae710e53f295c3bfbcaebf4eb79ce2f0e54122">
mk/flavours/validate.mk
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<li class="file-stats">
<a href="#70e33e33a3fdca5f9cd984f140bf484556976958">
utils/ghc-cabal/ghc.mk
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<h4>Changes:</h4>
<li id="5b653ef3b00262d0f1454de11e0714bd59d072e5">
<a href="https://gitlab.haskell.org/ghc/ghc/compare/5da6c86f7b1304af3c314b3f9c0b007d6508c427...76b7f619385ac5d126dd186ff3bfe4cdad9349e7#5b653ef3b00262d0f1454de11e0714bd59d072e5"><strong>hadrian/cabal.project</strong></a>
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<pre style="margin: 0;"> <span id="LC1" class="line" lang="mosel"><span class="n" style="color: #333;">packages</span><span class="p">:</span> <span class="p">./</span></span>
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<pre style="margin: 0;"> <span id="LC2" class="line" lang="mosel"> <span class="p">../</span><span class="n" style="color: #333;">libraries</span><span class="p">/</span><span class="n" style="color: #333;">Cabal</span><span class="p">/</span><span class="n" style="color: #333;">Cabal</span><span class="p">/</span></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="mosel"></span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="mosel"><span class="p">--</span> <span class="n" style="color: #333;">N</span><span class="p">.</span><span class="n" style="color: #333;">B</span><span class="p">.</span> <span class="nf" style="color: #900; font-weight: 600;">Compile</span> <span class="k" style="font-weight: 600;">with</span> <span class="p">-</span><span class="n" style="color: #333;">O0</span> <span class="n" style="color: #333;">since</span> <span class="n" style="color: #333;">this</span> <span class="n" style="color: #333;">is</span> <span class="k" style="font-weight: 600;">not</span> <span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">performance</span><span class="p">-</span><span class="n" style="color: #333;">critical</span> <span class="n" style="color: #333;">executable</span></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="mosel"><span class="p">--</span> <span class="k" style="font-weight: 600;">and</span> <span class="n" style="color: #333;">the</span> <span class="n" style="color: #333;">Cabal</span> <span class="n" style="color: #333;">takes</span> <span class="n" style="color: #333;">nearly</span> <span class="n" style="color: #333;">twice</span> <span class="k" style="font-weight: 600;">as</span> <span class="n" style="color: #333;">long</span> <span class="k" style="font-weight: 600;">to</span> <span class="n" style="color: #333;">build</span> <span class="k" style="font-weight: 600;">with</span> <span class="p">-</span><span class="n" style="color: #333;">O1</span><span class="p">.</span> <span class="n" style="color: #333;">See</span> <span class="p">#</span><span class="m" style="color: #099;">16817.</span></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="mosel"><span class="k" style="font-weight: 600;">package</span> <span class="n" style="color: #333;">Cabal</span></span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="mosel"> <span class="n" style="color: #333;">optimization</span><span class="p">:</span> <span class="nb" style="color: #0086b3;">False</span></span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="mosel"></span></pre>
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<li id="6d5bb3f66af29932d469deefe0f4351faf14a304">
<a href="https://gitlab.haskell.org/ghc/ghc/compare/5da6c86f7b1304af3c314b3f9c0b007d6508c427...76b7f619385ac5d126dd186ff3bfe4cdad9349e7#6d5bb3f66af29932d469deefe0f4351faf14a304"><strong>hadrian/src/Settings/Flavours/Development.hs</strong></a>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="2" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -2,6 +2,7 @@ module Settings.Flavours.Development (developmentFlavour) where</td>
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<pre style="margin: 0;"> <span id="LC2" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC3" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Expression</span></span>
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<pre style="margin: 0;"> <span id="LC4" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Flavour</span></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Packages</span></span>
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="err" style="color: #a61717; background-color: #e3d2d2;">{-#</span> <span class="nn" style="color: #555;">SOURCE</span> <span class="o" style="font-weight: 600;">#-</span><span class="p">}</span> <span class="kt" style="color: #458; font-weight: 600;">Settings</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Default</span></span>
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<pre style="margin: 0;"> <span id="LC7" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC8" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Please update doc/flavours.md when changing this file.</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="17" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="18" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -17,7 +18,10 @@ developmentArgs :: Stage -> Args</td>
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<pre style="margin: 0;"> <span id="LC18" class="line" lang="haskell"><span class="n" style="color: #333;">developmentArgs</span> <span class="n" style="color: #333;">ghcStage</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;"> <span id="LC19" class="line" lang="haskell"> <span class="n" style="color: #333;">stage</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getStage</span></span>
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<pre style="margin: 0;"> <span id="LC20" class="line" lang="haskell"> <span class="n" style="color: #333;">sourceArgs</span> <span class="kt" style="color: #458; font-weight: 600;">SourceArgs</span></span>
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<pre style="margin: 0;">-<span id="LC20" class="line" lang="haskell"> <span class="p">{</span> <span class="n" style="color: #333;">hsDefault</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pure</span> <span class="p">[</span><span class="s" style="color: #d14;">"-O"</span><span class="p">,</span> <span class="s" style="color: #d14;">"-H64m"</span><span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC21" class="line" lang="haskell"> <span class="p">{</span> <span class="n" style="color: #333;">hsDefault</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mconcat</span> <span class="p">[</span> <span class="n" style="color: #333;">pure</span> <span class="p">[</span><span class="s" style="color: #d14;">"-O"</span><span class="p">,</span> <span class="s" style="color: #d14;">"-H64m"</span><span class="p">],</span></span>
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<pre style="margin: 0;">+<span id="LC22" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Disable optimization when building Cabal;</span></span>
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<pre style="margin: 0;">+<span id="LC23" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- this saves many minutes of build time.</span></span>
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<pre style="margin: 0;">+<span id="LC24" class="line" lang="haskell"> <span class="n" style="color: #333;">package</span> <span class="n" style="color: #333;">cabal</span> <span class="o" style="font-weight: 600;">?</span> <span class="n" style="color: #333;">pure</span> <span class="p">[</span><span class="s" style="color: #d14;">"-O0"</span><span class="p">]]</span></span>
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<pre style="margin: 0;"> <span id="LC25" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">hsLibrary</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">notStage0</span> <span class="o" style="font-weight: 600;">?</span> <span class="n" style="color: #333;">arg</span> <span class="s" style="color: #d14;">"-dcore-lint"</span></span>
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<pre style="margin: 0;"> <span id="LC26" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">hsCompiler</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mconcat</span> <span class="p">[</span><span class="n" style="color: #333;">stage0</span> <span class="o" style="font-weight: 600;">?</span> <span class="n" style="color: #333;">arg</span> <span class="s" style="color: #d14;">"-O2"</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC27" class="line" lang="haskell"> <span class="n" style="color: #333;">succ</span> <span class="n" style="color: #333;">stage</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">ghcStage</span> <span class="o" style="font-weight: 600;">?</span> <span class="n" style="color: #333;">pure</span> <span class="p">[</span><span class="s" style="color: #d14;">"-O0"</span><span class="p">,</span> <span class="s" style="color: #d14;">"-DDEBUG"</span><span class="p">]]</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/compare/5da6c86f7b1304af3c314b3f9c0b007d6508c427...76b7f619385ac5d126dd186ff3bfe4cdad9349e7#eda903e01cf88e7ce73a341d5fc0bb4d12470b60"><strong>mk/flavours/devel1.mk</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -10,3 +10,7 @@ BUILD_SPHINX_PDF = NO</td>
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<pre style="margin: 0;"> <span id="LC10" class="line" lang="plaintext">BUILD_MAN = NO</span>
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<pre style="margin: 0;"> <span id="LC11" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC12" class="line" lang="plaintext">LAX_DEPENDENCIES = YES</span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="plaintext"># Reduce optimisation when building Cabal; this makes a significant difference</span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="plaintext"># in overall build time. See #16817.</span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="plaintext">libraries/Cabal_dist-install_HC_OPTS += -O0</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/compare/5da6c86f7b1304af3c314b3f9c0b007d6508c427...76b7f619385ac5d126dd186ff3bfe4cdad9349e7#617f322f762edbe7d7ca48ebfaea08450b81d6a9"><strong>mk/flavours/devel2.mk</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -10,3 +10,7 @@ BUILD_SPHINX_PDF = NO</td>
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<pre style="margin: 0;"> <span id="LC10" class="line" lang="plaintext">BUILD_MAN = NO</span>
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<pre style="margin: 0;"> <span id="LC11" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC12" class="line" lang="plaintext">LAX_DEPENDENCIES = YES</span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="plaintext"># Reduce optimisation when building Cabal; this makes a significant difference</span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="plaintext"># in overall build time. See #16817.</span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="plaintext">libraries/Cabal_dist-install_HC_OPTS += -O0</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/compare/5da6c86f7b1304af3c314b3f9c0b007d6508c427...76b7f619385ac5d126dd186ff3bfe4cdad9349e7#0eae710e53f295c3bfbcaebf4eb79ce2f0e54122"><strong>mk/flavours/validate.mk</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -27,6 +27,10 @@ endif</td>
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<pre style="margin: 0;"> <span id="LC27" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC28" class="line" lang="plaintext">WERROR = -Werror</span>
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<pre style="margin: 0;"> <span id="LC29" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC30" class="line" lang="plaintext"># Reduce optimisation when building Cabal; this makes a significant difference</span>
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<pre style="margin: 0;">+<span id="LC31" class="line" lang="plaintext"># in overall build time. See #16817.</span>
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<pre style="margin: 0;">+<span id="LC32" class="line" lang="plaintext">libraries/Cabal_dist-install_HC_OPTS += -O0</span>
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<pre style="margin: 0;">+<span id="LC33" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC34" class="line" lang="plaintext"># DO NOT EDIT THIS FILE! Instead, create a file mk/validate.mk, whose settings</span>
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<pre style="margin: 0;"> <span id="LC35" class="line" lang="plaintext"># will override these. See also mk/custom-settings.mk.</span>
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<pre style="margin: 0;"> <span id="LC36" class="line" lang="plaintext">#</span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -36,6 +40,7 @@ WERROR = -Werror</td>
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<pre style="margin: 0;"> <span id="LC40" class="line" lang="plaintext">#</span>
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<pre style="margin: 0;"> <span id="LC41" class="line" lang="plaintext">#</span>
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<pre style="margin: 0;"> <span id="LC42" class="line" lang="plaintext"># Note [validate build settings]</span>
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<pre style="margin: 0;">+<span id="LC43" class="line" lang="plaintext"># ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span>
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<pre style="margin: 0;"> <span id="LC44" class="line" lang="plaintext">#</span>
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<pre style="margin: 0;"> <span id="LC45" class="line" lang="plaintext"># Using GhcStage2HcOpts=-O (rather than -O0) here bringes my validate down from</span>
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<pre style="margin: 0;"> <span id="LC46" class="line" lang="plaintext"># 22mins to 16 mins. Compiling stage2 takes longer, but we gain a faster</span>
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<a href="https://gitlab.haskell.org/ghc/ghc/compare/5da6c86f7b1304af3c314b3f9c0b007d6508c427...76b7f619385ac5d126dd186ff3bfe4cdad9349e7#70e33e33a3fdca5f9cd984f140bf484556976958"><strong>utils/ghc-cabal/ghc.mk</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -52,10 +52,13 @@ $(ghc-cabal_DIST_BINARY): $(wildcard libraries/Cabal/Cabal/Distribution/*/*/*.hs</td>
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<pre style="margin: 0;"> <span id="LC52" class="line" lang="plaintext">$(ghc-cabal_DIST_BINARY): $(wildcard libraries/Cabal/Cabal/Distribution/*/*.hs)</span>
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<pre style="margin: 0;"> <span id="LC53" class="line" lang="plaintext">$(ghc-cabal_DIST_BINARY): $(wildcard libraries/Cabal/Cabal/Distribution/*.hs)</span>
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<pre style="margin: 0;"> <span id="LC54" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC55" class="line" lang="plaintext"># N.B. Compile with -O0 since this is not a performance-critical executable</span>
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<pre style="margin: 0;">+<span id="LC56" class="line" lang="plaintext"># and the Cabal takes nearly twice as long to build with -O1. See #16817.</span>
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<pre style="margin: 0;"> <span id="LC57" class="line" lang="plaintext">$(ghc-cabal_DIST_BINARY): $(CABAL_LEXER_DEP) utils/ghc-cabal/Main.hs $(TOUCH_DEP) | $$(dir $$@)/. bootstrapping/.</span>
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<pre style="margin: 0;"> <span id="LC58" class="line" lang="plaintext"> "$(GHC)" $(SRC_HC_OPTS) \</span>
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<pre style="margin: 0;"> <span id="LC59" class="line" lang="plaintext"> $(addprefix -optc, $(SRC_CC_OPTS) $(CONF_CC_OPTS_STAGE0)) \</span>
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<pre style="margin: 0;"> <span id="LC60" class="line" lang="plaintext"> $(addprefix -optl, $(SRC_LD_OPTS) $(CONF_GCC_LINKER_OPTS_STAGE0)) \</span>
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<pre style="margin: 0;">+<span id="LC61" class="line" lang="plaintext"> -O0 \</span>
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<pre style="margin: 0;"> <span id="LC62" class="line" lang="plaintext"> -hide-all-packages \</span>
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<pre style="margin: 0;"> <span id="LC63" class="line" lang="plaintext"> $(addprefix -package , $(CABAL_BUILD_DEPS)) \</span>
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<pre style="margin: 0;"> <span id="LC64" class="line" lang="plaintext"> --make utils/ghc-cabal/Main.hs -o $@ \</span>
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