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Marge Bot pushed to branch master
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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Commits:
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/commit/a1bf3413f850d0e8a68ecab6ee7f18f18b67ea56">a1bf3413</a></strong>
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<span>by David Eichmann</span>
<i>at 2019-05-29T20:07:24Z</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Hadrian: Add note about Libffi's Indicating Inputs #16653
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<h4>1 changed file:</h4>
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hadrian/src/Rules/Libffi.hs
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<h4>Changes:</h4>
<li id="b526b637050952b6307a0695885c438f0db312d2">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/a1bf3413f850d0e8a68ecab6ee7f18f18b67ea56#b526b637050952b6307a0695885c438f0db312d2"><strong>hadrian/src/Rules/Libffi.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">@@ -13,6 +13,35 @@ import Settings.Builders.Common</td>
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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;">Target</span></span>
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<pre style="margin: 0;"> <span id="LC14" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Utilities</span></span>
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<pre style="margin: 0;"> <span id="LC15" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Libffi indicating inputs]</span></span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">First see https://gitlab.haskell.org/ghc/ghc/wikis/Developing-Hadrian for an</span></span>
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">explanation of "indicating input". Part of the definition is copied here for</span></span>
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">your convenience:</span></span>
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<pre style="margin: 0;">+<span id="LC21" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC22" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> change in the vital output -> change in the indicating inputs</span></span>
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<pre style="margin: 0;">+<span id="LC23" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC24" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">In the case of building libffi `vital output = built libffi library files` and</span></span>
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<pre style="margin: 0;">+<span id="LC25" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">we can consider the libffi archive file (i.e. the "libffi-tarballs/libffi*.tar.gz"</span></span>
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<pre style="margin: 0;">+<span id="LC26" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">file) to be the only indicating input besides the build tools (e.g. make).</span></span>
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<pre style="margin: 0;">+<span id="LC27" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note building libffi is split into a few rules, but we also expect that:</span></span>
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<pre style="margin: 0;">+<span id="LC28" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC29" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> no change in the archive file -> no change in the intermediate build artifacts</span></span>
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<pre style="margin: 0;">+<span id="LC30" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC31" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">and so the archive file is still a valid choice of indicating input for</span></span>
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<pre style="margin: 0;">+<span id="LC32" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">all libffi rules. Hence we can get away with `need`ing only the archive file and</span></span>
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<pre style="margin: 0;">+<span id="LC33" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">don't have to `need` intermediate build artifacts (besides those to trigger</span></span>
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<pre style="margin: 0;">+<span id="LC34" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">dependant libffi rules i.e. to generate vital inputs as is noted on the wiki).</span></span>
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<pre style="margin: 0;">+<span id="LC35" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">It is then safe to `trackAllow` the libffi build directory as is done in</span></span>
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<pre style="margin: 0;">+<span id="LC36" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">`needLibfffiArchive`.</span></span>
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<pre style="margin: 0;">+<span id="LC37" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC38" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">A disadvantage to this approach is that changing the archive file forces a clean</span></span>
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<pre style="margin: 0;">+<span id="LC39" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">build of libffi i.e. we cannot incrementally build libffi. This seems like a</span></span>
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<pre style="margin: 0;">+<span id="LC40" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">performance issue, but is justified as building libffi is fast and the archive</span></span>
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<pre style="margin: 0;">+<span id="LC41" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">file is rarely changed.</span></span>
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<pre style="margin: 0;">+<span id="LC42" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC43" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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<pre style="margin: 0;">+<span id="LC44" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC45" class="line" lang="haskell"><span class="cd">-- | Oracle question type. The oracle returns the list of dynamic</span></span>
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<pre style="margin: 0;"> <span id="LC46" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- libffi library file paths (all but one of which should be symlinks).</span></span>
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<pre style="margin: 0;"> <span id="LC47" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">newtype</span> <span class="kt" style="color: #458; font-weight: 600;">LibffiDynLibs</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">LibffiDynLibs</span> <span class="kt" style="color: #458; font-weight: 600;">Stage</span></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">@@ -105,13 +134,7 @@ configureEnvironment stage = do</td>
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<pre style="margin: 0;"> <span id="LC134" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">return</span> <span class="o" style="font-weight: 600;">.</span> <span class="kt" style="color: #458; font-weight: 600;">AddEnv</span> <span class="s" style="color: #d14;">"LDFLAGS"</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">unwords</span> <span class="n" style="color: #333;">ldFlags</span> <span class="o" style="font-weight: 600;">++</span> <span class="s" style="color: #d14;">" -w"</span> <span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC135" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC136" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Need the libffi archive and `trackAllow` all files in the build directory.</span></span>
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<pre style="margin: 0;">-<span id="LC108" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- As all libffi build files are derived from this archive, we can safely</span></span>
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<pre style="margin: 0;">-<span id="LC109" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- `trackAllow` the libffi build dir. I.e the archive file can be seen as a</span></span>
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<pre style="margin: 0;">-<span id="LC110" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- shallow dependency of the libffi build. This is much simpler than working out</span></span>
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<pre style="margin: 0;">-<span id="LC111" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- the dependencies of each rule (within the build dir).</span></span>
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<pre style="margin: 0;">-<span id="LC112" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- This means changing the archive file forces a clean build of libffi. This</span></span>
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<pre style="margin: 0;">-<span id="LC113" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- seems like a performance issue, but is justified as building libffi is fast</span></span>
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<pre style="margin: 0;">-<span id="LC114" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- and the archive file is rarely changed.</span></span>
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<pre style="margin: 0;">+<span id="LC137" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See [Libffi indicating inputs].</span></span>
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<pre style="margin: 0;"> <span id="LC138" class="line" lang="haskell"><span class="n" style="color: #333;">needLibfffiArchive</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">FilePath</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Action</span> <span class="kt" style="color: #458; font-weight: 600;">FilePath</span></span>
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<pre style="margin: 0;"> <span id="LC139" class="line" lang="haskell"><span class="n" style="color: #333;">needLibfffiArchive</span> <span class="n" style="color: #333;">buildPath</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="LC140" class="line" lang="haskell"> <span class="n" style="color: #333;">top</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">topDirectory</span></span>
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