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<h3>
Moritz Angermann pushed to branch wip/angerman/fix-hadrian-cross-macos
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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<h4>
Commits:
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<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/41f9ae95b785bc57c6d104700cf2a407800e148b">41f9ae95</a></strong>
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<span>by Moritz Angermann</span>
<i>at 2020-06-20T11:38:59+08:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">add docs
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<h4>1 changed file:</h4>
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<a href="#3fd6f85e1eb999d14a760e95e4292600fd7673c8">
hadrian/src/Oracles/Flag.hs
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<h4>Changes:</h4>
<li id="3fd6f85e1eb999d14a760e95e4292600fd7673c8">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/41f9ae95b785bc57c6d104700cf2a407800e148b#3fd6f85e1eb999d14a760e95e4292600fd7673c8"><strong>hadrian/src/Oracles/Flag.hs</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">@@ -12,6 +12,18 @@ import Base</td>
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<pre style="margin: 0;"> <span id="LC12" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Context</span></span>
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<pre style="margin: 0;"> <span id="LC13" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Oracles.Setting</span></span>
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<pre style="margin: 0;"> <span id="LC14" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Flags can be either staged or not.  Global flags are assumed to be identical</span></span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- across all stages.  While staged flags are specific to a given stage.  Flags</span></span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- are read from the @cfg/system.config@ (the result of configure processing</span></span>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @cfg/system.config.in@).  See @flag@ below for the actual FlagName to lookup</span></span>
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- key mapping.  If staged flags can not be found, they fall back to the Global</span></span>
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- flag.  Thus we can special case only single stages while falling back to the</span></span>
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<pre style="margin: 0;">+<span id="LC21" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- global value.</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;">--</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;">-- Example: When cross compiling the Stage0 (bootstrap) @ar@ might be bsd ar and</span></span>
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<pre style="margin: 0;">+<span id="LC24" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- thus not support \@ response files.  However the the Stage1+ toolchain might.</span></span>
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<pre style="margin: 0;">+<span id="LC25" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Therefore we must special case @ArSupportsAtFile@ for stage0 to be NO, while</span></span>
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<pre style="margin: 0;">+<span id="LC26" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- it can be YES for stage1+.</span></span>
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<pre style="margin: 0;"> <span id="LC27" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">FlagName</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ArSupportsAtFile</span></span>
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<pre style="margin: 0;"> <span id="LC28" class="line" lang="haskell">              <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">CrossCompiling</span></span>
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<pre style="margin: 0;"> <span id="LC29" class="line" lang="haskell">              <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">CcLlvmBackend</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="39" 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">@@ -27,6 +39,9 @@ data FlagName = ArSupportsAtFile</td>
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<pre style="margin: 0;"> <span id="LC39" class="line" lang="haskell">              <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">UseSystemFfi</span></span>
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<pre style="margin: 0;"> <span id="LC40" class="line" lang="haskell">              <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">BootstrapThreadedRts</span></span>
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<pre style="margin: 0;"> <span id="LC41" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC42" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Use Global if you are certain the flag is global across all stages (or there</span></span>
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<pre style="margin: 0;">+<span id="LC43" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- simply is no stage/context available).  Use of Staged is preferred as it</span></span>
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<pre style="margin: 0;">+<span id="LC44" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- provides more precise information about the use of the Flag.</span></span>
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<pre style="margin: 0;"> <span id="LC45" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">Flag</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Global</span> <span class="kt" style="color: #458; font-weight: 600;">FlagName</span></span>
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<pre style="margin: 0;"> <span id="LC46" class="line" lang="haskell">          <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Staged</span> <span class="kt" style="color: #458; font-weight: 600;">Stage</span> <span class="kt" style="color: #458; font-weight: 600;">FlagName</span></span>
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<pre style="margin: 0;"> <span id="LC47" class="line" lang="haskell"></span>
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