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<h3>
Ben Gamari pushed to branch wip/rip-out-fast-llvm
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/0b57db5f9a6ff27bb4a29464c3bfdaf5f3e7857b">0b57db5f</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-04-20T13:27:37-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">llvmGen: Remove -fast-llvm flag
Issue #18076 drew my attention to the undocumented `-fast-llvm` flag for
the LLVM code generator introduced in
22733532171330136d87533d523f565f2a4f102f. Speaking to Moritz about this,
the motivation for this flag was to avoid potential incompatibilities
between LLVM and the assembler/linker toolchain by making LLVM
responsible for machine-code generation.
Unfortunately, this cannot possibly work: the LLVM backend's mangler
performs a number of transforms on the assembler generated by LLVM that
are necessary for correctness. These are currently:
* mangling Haskell functions' symbol types to be `object` instead of
`function` on ELF platforms (necessary for tables-next-to-code)
* mangling AVX instructions to ensure that we don't assume alignment
(which LLVM otherwise does)
* mangling Darwin's subsections-via-symbols directives
Given that these are all necessary I don't believe that we can support
`-fast-llvm`. Let's rather remove it.
</pre>
</li>
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<h4>3 changed files:</h4>
<ul>
<li class="file-stats">
<a href="#b8e6af642e56019828828dc679683c04afb81867">
compiler/GHC/Driver/Pipeline.hs
</a>
</li>
<li class="file-stats">
<a href="#774d88050336ef660c7a219fb06c480c2fc639bc">
compiler/GHC/Driver/Session.hs
</a>
</li>
<li class="file-stats">
<a href="#c69ed1e399ce62d9f23fc51d2806dab1d9b7bfd6">
docs/users_guide/expected-undocumented-flags.txt
</a>
</li>
</ul>
<h4>Changes:</h4>
<li id="b8e6af642e56019828828dc679683c04afb81867">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0b57db5f9a6ff27bb4a29464c3bfdaf5f3e7857b#b8e6af642e56019828828dc679683c04afb81867"><strong>compiler/GHC/Driver/Pipeline.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">@@ -866,20 +866,6 @@ getOutputFilename stop_phase output basename dflags next_phase maybe_location</td>
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866
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<pre style="margin: 0;"> <span id="LC866" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">persistent</span></span>
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867
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867
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<pre style="margin: 0;"> <span id="LC867" class="line" lang="haskell"></span>
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868
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868
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<pre style="margin: 0;"> <span id="LC868" class="line" lang="haskell"></span>
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869
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<pre style="margin: 0;">-<span id="LC869" class="line" lang="haskell"><span class="cd">-- | The fast LLVM Pipeline skips the mangler and assembler,</span></span>
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870
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<pre style="margin: 0;">-<span id="LC870" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- emitting object code directly from llc.</span></span>
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871
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<pre style="margin: 0;">-<span id="LC871" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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872
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<pre style="margin: 0;">-<span id="LC872" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- slow: opt -> llc -> .s -> mangler -> as -> .o</span></span>
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873
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<pre style="margin: 0;">-<span id="LC873" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- fast: opt -> llc -> .o</span></span>
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874
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<pre style="margin: 0;">-<span id="LC874" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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875
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<pre style="margin: 0;">-<span id="LC875" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- hidden flag: -ffast-llvm</span></span>
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876
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<pre style="margin: 0;">-<span id="LC876" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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877
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<pre style="margin: 0;">-<span id="LC877" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- if keep-s-files is specified, we need to go through</span></span>
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878
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<pre style="margin: 0;">-<span id="LC878" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- the slow pipeline (Kavon Farvardin requested this).</span></span>
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879
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<pre style="margin: 0;">-<span id="LC879" class="line" lang="haskell"><span class="n" style="color: #333;">fastLlvmPipeline</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DynFlags</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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880
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<pre style="margin: 0;">-<span id="LC880" class="line" lang="haskell"><span class="n" style="color: #333;">fastLlvmPipeline</span> <span class="n" style="color: #333;">dflags</span></span>
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881
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<pre style="margin: 0;">-<span id="LC881" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">gopt</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_KeepSFiles</span> <span class="n" style="color: #333;">dflags</span><span class="p">)</span> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">gopt</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_FastLlvm</span> <span class="n" style="color: #333;">dflags</span></span>
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882
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<pre style="margin: 0;">-<span id="LC882" class="line" lang="haskell"></span>
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883
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869
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<pre style="margin: 0;"> <span id="LC869" class="line" lang="haskell"><span class="cd">-- | LLVM Options. These are flags to be passed to opt and llc, to ensure</span></span>
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884
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870
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<pre style="margin: 0;"> <span id="LC870" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- consistency we list them in pairs, so that they form groups.</span></span>
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885
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871
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<pre style="margin: 0;"> <span id="LC871" class="line" lang="haskell"><span class="n" style="color: #333;">llvmOptions</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DynFlags</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">@@ -890,7 +876,6 @@ llvmOptions dflags =</td>
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890
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876
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<pre style="margin: 0;"> <span id="LC876" class="line" lang="haskell"> <span class="p">,</span><span class="s" style="color: #d14;">"-relocation-model="</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">rmodel</span><span class="p">)</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">null</span> <span class="n" style="color: #333;">rmodel</span><span class="p">)]</span></span>
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891
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877
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<pre style="margin: 0;"> <span id="LC877" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">++</span> <span class="p">[(</span><span class="s" style="color: #d14;">"-stack-alignment="</span> <span class="o" style="font-weight: 600;">++</span> <span class="p">(</span><span class="n" style="color: #333;">show</span> <span class="n" style="color: #333;">align</span><span class="p">)</span></span>
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892
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878
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<pre style="margin: 0;"> <span id="LC878" class="line" lang="haskell"> <span class="p">,</span><span class="s" style="color: #d14;">"-stack-alignment="</span> <span class="o" style="font-weight: 600;">++</span> <span class="p">(</span><span class="n" style="color: #333;">show</span> <span class="n" style="color: #333;">align</span><span class="p">))</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">align</span> <span class="o" style="font-weight: 600;">></span> <span class="mi" style="color: #099;">0</span> <span class="p">]</span></span>
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893
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<pre style="margin: 0;">-<span id="LC893" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">++</span> <span class="p">[(</span><span class="s" style="color: #d14;">""</span><span class="p">,</span> <span class="s" style="color: #d14;">"-filetype=obj"</span><span class="p">)</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">fastLlvmPipeline</span> <span class="n" style="color: #333;">dflags</span> <span class="p">]</span></span>
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894
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879
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<pre style="margin: 0;"> <span id="LC879" class="line" lang="haskell"></span>
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895
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880
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<pre style="margin: 0;"> <span id="LC880" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Additional llc flags</span></span>
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896
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881
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<pre style="margin: 0;"> <span id="LC881" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">++</span> <span class="p">[(</span><span class="s" style="color: #d14;">""</span><span class="p">,</span> <span class="s" style="color: #d14;">"-mcpu="</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">mcpu</span><span class="p">)</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">null</span> <span class="n" style="color: #333;">mcpu</span><span class="p">)</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1457" 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">@@ -1472,8 +1457,7 @@ runPhase (RealPhase LlvmOpt) input_fn dflags</td>
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1472
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1457
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<pre style="margin: 0;"> <span id="LC1457" class="line" lang="haskell"></span>
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1473
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1458
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<pre style="margin: 0;"> <span id="LC1458" class="line" lang="haskell"><span class="n" style="color: #333;">runPhase</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">RealPhase</span> <span class="kt" style="color: #458; font-weight: 600;">LlvmLlc</span><span class="p">)</span> <span class="n" style="color: #333;">input_fn</span> <span class="n" style="color: #333;">dflags</span></span>
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1474
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1459
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<pre style="margin: 0;"> <span id="LC1459" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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1475
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<pre style="margin: 0;">-<span id="LC1475" class="line" lang="haskell"> <span class="n" style="color: #333;">next_phase</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kr" style="font-weight: 600;">if</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">fastLlvmPipeline</span> <span class="n" style="color: #333;">dflags</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">maybeMergeForeign</span></span>
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1476
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<pre style="margin: 0;">-<span id="LC1476" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- hidden debugging flag '-dno-llvm-mangler' to skip mangling</span></span>
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1460
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<pre style="margin: 0;">+<span id="LC1460" class="line" lang="haskell"> <span class="n" style="color: #333;">next_phase</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kr" style="font-weight: 600;">if</span> <span class="c1" style="color: #998; font-style: italic;">-- hidden debugging flag '-dno-llvm-mangler' to skip mangling</span></span>
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1477
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1461
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<pre style="margin: 0;"> <span id="LC1461" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">gopt</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_NoLlvmMangler</span> <span class="n" style="color: #333;">dflags</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">As</span> <span class="kt" style="color: #458; font-weight: 600;">False</span><span class="p">)</span></span>
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1478
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1462
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<pre style="margin: 0;"> <span id="LC1462" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">return</span> <span class="kt" style="color: #458; font-weight: 600;">LlvmMangle</span></span>
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1479
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1463
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<pre style="margin: 0;"> <span id="LC1463" class="line" lang="haskell"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0b57db5f9a6ff27bb4a29464c3bfdaf5f3e7857b#774d88050336ef660c7a219fb06c480c2fc639bc"><strong>compiler/GHC/Driver/Session.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">@@ -2815,8 +2815,6 @@ dynamic_flags_deps = [</td>
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2815
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2815
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<pre style="margin: 0;"> <span id="LC2815" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">NoArg</span> <span class="p">(</span><span class="n" style="color: #333;">setGeneralFlag</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_D_faststring_stats</span><span class="p">))</span></span>
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2816
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<pre style="margin: 0;"> <span id="LC2816" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">make_ord_flag</span> <span class="n" style="color: #333;">defGhcFlag</span> <span class="s" style="color: #d14;">"dno-llvm-mangler"</span></span>
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<pre style="margin: 0;"> <span id="LC2817" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">NoArg</span> <span class="p">(</span><span class="n" style="color: #333;">setGeneralFlag</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_NoLlvmMangler</span><span class="p">))</span> <span class="c1" style="color: #998; font-style: italic;">-- hidden flag</span></span>
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2818
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<pre style="margin: 0;">-<span id="LC2818" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">make_ord_flag</span> <span class="n" style="color: #333;">defGhcFlag</span> <span class="s" style="color: #d14;">"fast-llvm"</span></span>
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<pre style="margin: 0;">-<span id="LC2819" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">NoArg</span> <span class="p">(</span><span class="n" style="color: #333;">setGeneralFlag</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_FastLlvm</span><span class="p">))</span> <span class="c1" style="color: #998; font-style: italic;">-- hidden flag</span></span>
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<pre style="margin: 0;"> <span id="LC2818" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">make_ord_flag</span> <span class="n" style="color: #333;">defGhcFlag</span> <span class="s" style="color: #d14;">"dno-typeable-binds"</span></span>
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<pre style="margin: 0;"> <span id="LC2819" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">NoArg</span> <span class="p">(</span><span class="n" style="color: #333;">setGeneralFlag</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_NoTypeableBinds</span><span class="p">))</span></span>
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<pre style="margin: 0;"> <span id="LC2820" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">make_ord_flag</span> <span class="n" style="color: #333;">defGhcFlag</span> <span class="s" style="color: #d14;">"ddump-debug"</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0b57db5f9a6ff27bb4a29464c3bfdaf5f3e7857b#c69ed1e399ce62d9f23fc51d2806dab1d9b7bfd6"><strong>docs/users_guide/expected-undocumented-flags.txt</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">@@ -78,7 +78,6 @@</td>
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<pre style="margin: 0;"> <span id="LC78" class="line" lang="plaintext">-fallow-overlapping-instances</span>
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<pre style="margin: 0;"> <span id="LC79" class="line" lang="plaintext">-fallow-undecidable-instances</span>
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<pre style="margin: 0;"> <span id="LC80" class="line" lang="plaintext">-farrows</span>
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<pre style="margin: 0;">-<span id="LC81" class="line" lang="plaintext">-fast-llvm</span>
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<pre style="margin: 0;"> <span id="LC81" class="line" lang="plaintext">-fbang-patterns</span>
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<pre style="margin: 0;"> <span id="LC82" class="line" lang="plaintext">-fbuilding-cabal-package</span>
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<pre style="margin: 0;"> <span id="LC83" class="line" lang="plaintext">-fconstraint-solver-iterations</span>
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