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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>
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<h4>
Commits:
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a7c4439a407ad85b76aab9301fda61e7c10183ff">a7c4439a</a></strong>
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<span>by Matthias Andreas Benkard</span>
<i>at 2020-07-26T13:23:24-04:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Document loadFramework changes. (#18446)
Adds commentary on the rationale for the changes made in merge request
!3689.
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<h4>1 changed file:</h4>
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compiler/GHC/Runtime/Linker.hs
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<h4>Changes:</h4>
<li id="3556223cd3ef45d787321b5290bf33535a361873">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a7c4439a407ad85b76aab9301fda61e7c10183ff#3556223cd3ef45d787321b5290bf33535a361873"><strong>compiler/GHC/Runtime/Linker.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">@@ -1695,6 +1695,38 @@ addEnvPaths name list</td>
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<pre style="margin: 0;"> <span id="LC1695" 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="LC1696" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Loading a dynamic library (dlopen()-ish on Unix, LoadLibrary-ish on Win32)</span></span>
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<pre style="margin: 0;"> <span id="LC1697" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1698" 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="LC1699" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [macOS Big Sur dynamic libraries]</span></span>
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<pre style="margin: 0;">+<span id="LC1700" 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="LC1701" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1702" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">macOS Big Sur makes the following change to how frameworks are shipped</span></span>
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<pre style="margin: 0;">+<span id="LC1703" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">with the OS:</span></span>
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<pre style="margin: 0;">+<span id="LC1704" class="line" lang="haskell"></span>
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<td class="diff-line-num new new_line" data-linenumber="1705" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC1705" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">> New in macOS Big Sur 11 beta, the system ships with a built-in</span></span>
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<pre style="margin: 0;">+<span id="LC1706" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">> dynamic linker cache of all system-provided libraries. As part of</span></span>
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<pre style="margin: 0;">+<span id="LC1707" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">> this change, copies of dynamic libraries are no longer present on</span></span>
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<pre style="margin: 0;">+<span id="LC1708" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">> the filesystem. Code that attempts to check for dynamic library</span></span>
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<pre style="margin: 0;">+<span id="LC1709" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">> presence by looking for a file at a path or enumerating a directory</span></span>
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<pre style="margin: 0;">+<span id="LC1710" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">> will fail. Instead, check for library presence by attempting to</span></span>
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<pre style="margin: 0;">+<span id="LC1711" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">> dlopen() the path, which will correctly check for the library in the</span></span>
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<pre style="margin: 0;">+<span id="LC1712" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">> cache. (62986286)</span></span>
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<pre style="margin: 0;">+<span id="LC1713" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1714" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">(https://developer.apple.com/documentation/macos-release-notes/macos-big-sur-11-beta-release-notes/)</span></span>
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<pre style="margin: 0;">+<span id="LC1715" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1716" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Therefore, the previous method of checking whether a library exists</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1717" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1717
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<pre style="margin: 0;">+<span id="LC1717" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">before attempting to load it makes GHC.Runtime.Linker.loadFramework</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1718" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1718
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<pre style="margin: 0;">+<span id="LC1718" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">fail to find frameworks installed at /System/Library/Frameworks.</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1719" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1719
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<pre style="margin: 0;">+<span id="LC1719" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Instead, any attempt to load a framework at runtime, such as by</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1720" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1720
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<pre style="margin: 0;">+<span id="LC1720" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">passing -framework OpenGL to runghc or running code loading such a</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1721" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1721
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<pre style="margin: 0;">+<span id="LC1721" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">framework with GHCi, fails with a 'not found' message.</span></span>
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1722
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<pre style="margin: 0;">+<span id="LC1722" class="line" lang="haskell"></span>
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1723
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<pre style="margin: 0;">+<span id="LC1723" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">GHC.Runtime.Linker.loadFramework now opportunistically loads the</span></span>
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1724
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<pre style="margin: 0;">+<span id="LC1724" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">framework libraries without checking for their existence first,</span></span>
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1725
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<pre style="margin: 0;">+<span id="LC1725" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">failing only if all attempts to load a given framework from any of the</span></span>
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1726
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<pre style="margin: 0;">+<span id="LC1726" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">various possible locations fail. See also #18446, which this change</span></span>
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1727
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<pre style="margin: 0;">+<span id="LC1727" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">addresses.</span></span>
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1728
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<pre style="margin: 0;">+<span id="LC1728" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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1729
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<pre style="margin: 0;">+<span id="LC1729" class="line" lang="haskell"></span>
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1698
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1730
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<pre style="margin: 0;"> <span id="LC1730" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Darwin / MacOS X only: load a framework</span></span>
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1699
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1731
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<pre style="margin: 0;"> <span id="LC1731" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- a framework is a dynamic library packaged inside a directory of the same</span></span>
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1700
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1732
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<pre style="margin: 0;"> <span id="LC1732" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- name. They are searched for in different paths than normal libraries.</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1714" 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="1746" 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">@@ -1714,6 +1746,9 @@ loadFramework hsc_env extraPaths rootname</td>
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1714
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1746
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<pre style="margin: 0;"> <span id="LC1746" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- sorry for the hardcoded paths, I hope they won't change anytime soon:</span></span>
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1715
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<pre style="margin: 0;"> <span id="LC1747" class="line" lang="haskell"> <span class="n" style="color: #333;">defaultFrameworkPaths</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">[</span><span class="s" style="color: #d14;">"/Library/Frameworks"</span><span class="p">,</span> <span class="s" style="color: #d14;">"/System/Library/Frameworks"</span><span class="p">]</span></span>
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1716
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1748
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<pre style="margin: 0;"> <span id="LC1748" class="line" lang="haskell"></span>
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1749
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<pre style="margin: 0;">+<span id="LC1749" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Try to call loadDLL for each candidate path.</span></span>
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1750
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<pre style="margin: 0;">+<span id="LC1750" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">--</span></span>
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1751
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<pre style="margin: 0;">+<span id="LC1751" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [macOS Big Sur dynamic libraries]</span></span>
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1717
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1752
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<pre style="margin: 0;"> <span id="LC1752" class="line" lang="haskell"> <span class="n" style="color: #333;">findLoadDLL</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="n" style="color: #333;">errs</span> <span class="o" style="font-weight: 600;">=</span></span>
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1718
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1753
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<pre style="margin: 0;"> <span id="LC1753" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Tried all our known library paths, but dlopen()</span></span>
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<td class="diff-line-num old_line" data-linenumber="1719" 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">
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1754
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<pre style="margin: 0;"> <span id="LC1754" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- has no built-in paths for frameworks: give up</span></span>
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