<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+ <meta encoding="utf8">
<link rel="stylesheet" href="llvm.css" type="text/css">
- <title>LLVM 2.8 Release Notes</title>
+ <title>LLVM 2.9 Release Notes</title>
</head>
<body>
-<div class="doc_title">LLVM 2.8 Release Notes</div>
+<div class="doc_title">LLVM 2.9 Release Notes</div>
<img align=right src="http://llvm.org/img/DragonSmall.png"
width="136" height="136" alt="LLVM Dragon Logo">
<ol>
<li><a href="#intro">Introduction</a></li>
<li><a href="#subproj">Sub-project Status Update</a></li>
- <li><a href="#externalproj">External Projects Using LLVM 2.8</a></li>
- <li><a href="#whatsnew">What's New in LLVM 2.8?</a></li>
+ <li><a href="#externalproj">External Projects Using LLVM 2.9</a></li>
+ <li><a href="#whatsnew">What's New in LLVM 2.9?</a></li>
<li><a href="GettingStarted.html">Installation Instructions</a></li>
- <li><a href="#portability">Portability and Supported Platforms</a></li>
<li><a href="#knownproblems">Known Problems</a></li>
<li><a href="#additionalinfo">Additional Information</a></li>
</ol>
<p>Written by the <a href="http://llvm.org">LLVM Team</a></p>
</div>
-<h1 style="color:red">These are in-progress notes for the upcoming LLVM 2.8
+<h1 style="color:red">These are in-progress notes for the upcoming LLVM 2.9
release.<br>
You may prefer the
-<a href="http://llvm.org/releases/2.7/docs/ReleaseNotes.html">LLVM 2.7
+<a href="http://llvm.org/releases/2.8/docs/ReleaseNotes.html">LLVM 2.8
Release Notes</a>.</h1>
<!-- *********************************************************************** -->
<div class="doc_text">
<p>This document contains the release notes for the LLVM Compiler
-Infrastructure, release 2.8. Here we describe the status of LLVM, including
+Infrastructure, release 2.9. Here we describe the status of LLVM, including
major improvements from the previous release and significant known problems.
All LLVM releases may be downloaded from the <a
href="http://llvm.org/releases/">LLVM releases web site</a>.</p>
<a href="http://llvm.org/releases/">releases page</a>.</p>
</div>
-
+
+<!-- NOTE: last release for llvm-gcc -->
<!--
Almost dead code.
- include/llvm/Analysis/LiveValues.h => Dan
- lib/Transforms/IPO/MergeFunctions.cpp => consider for 2.8.
- llvm/Analysis/PointerTracking.h => Edwin wants this, consider for 2.8.
- GEPSplitterPass
+ lib/Transforms/IPO/MergeFunctions.cpp => consider for 3.0.
-->
-<!-- Features that need text if they're finished for 2.8:
+<!-- Features that need text if they're finished for 3.0:
combiner-aa?
strong phi elim
- llvm.dbg.value: variable debug info for optimized code
loop dependence analysis
TBAA
+ CorrelatedValuePropagation
-->
-
- <!-- for announcement email:
- Logo web page.
- Many new papers added to /pubs/
- -->
-
+
<!-- *********************************************************************** -->
<div class="doc_section">
<a name="subproj">Sub-project Status Update</a>
<div class="doc_text">
<p>
-The LLVM 2.8 distribution currently consists of code from the core LLVM
+The LLVM 2.9 distribution currently consists of code from the core LLVM
repository (which roughly includes the LLVM optimizers, code generators
and supporting tools), the Clang repository and the llvm-gcc repository. In
addition to this code, the LLVM Project includes other sub-projects that are in
standards, fast compilation, and low memory use. Like LLVM, Clang provides a
modular, library-based architecture that makes it suitable for creating or
integrating with other development tools. Clang is considered a
-production-quality compiler for C and Objective-C on x86 (32- and 64-bit).</p>
+production-quality compiler for C, Objective-C, C++ and Objective-C++ on x86
+(32- and 64-bit), and for darwin-arm targets.</p>
-<p>In the LLVM 2.8 time-frame, the Clang team has made many improvements:</p>
+<p>In the LLVM 2.9 time-frame, the Clang team has made many improvements:</p>
<ul>
-
</ul>
</div>
future</a>!). The tool is very good at finding bugs that occur on specific
paths through code, such as on error conditions.</p>
-<p>In the LLVM 2.8 time-frame,
+<p>The LLVM 2.9 release...
</p>
</div>
<!--=========================================================================-->
<div class="doc_subsection">
-<a name="vmkit">VMKit: JVM/CLI Virtual Machine Implementation</a>
+<a name="dragonegg">DragonEgg: llvm-gcc ported to gcc-4.5</a>
</div>
<div class="doc_text">
+NOTE: This should be written to be self-contained without referencing llvm-gcc.
+
<p>
-The <a href="http://vmkit.llvm.org/">VMKit project</a> is an implementation of
-a JVM and a CLI Virtual Machine (Microsoft .NET is an
-implementation of the CLI) using LLVM for static and just-in-time
-compilation.</p>
+<a href="http://dragonegg.llvm.org/">DragonEgg</a> is a port of llvm-gcc to
+gcc-4.5. Unlike llvm-gcc, dragonegg in theory does not require any gcc-4.5
+modifications whatsoever (currently one small patch is needed) thanks to the
+new <a href="http://gcc.gnu.org/wiki/plugins">gcc plugin architecture</a>.
+DragonEgg is a gcc plugin that makes gcc-4.5 use the LLVM optimizers and code
+generators instead of gcc's, just like with llvm-gcc.
+</p>
-<p>With the release of LLVM 2.8, ...</p>
+<p>
+DragonEgg is still a work in progress, but it is able to compile a lot of code,
+for example all of gcc, LLVM and clang. Currently Ada, C, C++ and Fortran work
+well, while all other languages either don't work at all or only work poorly.
+For the moment only the x86-32 and x86-64 targets are supported, and only on
+linux and darwin (darwin may need additional gcc patches).
+</p>
+
+<p>
+The 2.9 release has the following notable changes:
+<ul>
+</ul>
</div>
+<!--=========================================================================-->
+<div class="doc_subsection">
+<a name="vmkit">VMKit: JVM Virtual Machine Implementation</a>
+</div>
+
+<div class="doc_text">
+<p>
+The <a href="http://vmkit.llvm.org/">VMKit project</a> is an implementation of
+a Java Virtual Machine (Java VM or JVM) that uses LLVM for static and
+just-in-time compilation.
+
+UPDATE.
+</p>
+</div>
<!--=========================================================================-->
<div class="doc_subsection">
<p>
All of the code in the compiler-rt project is available under the standard LLVM
-License, a "BSD-style" license. New in LLVM 2.8:
+License, a "BSD-style" license.
-Soft float support
-</p>
+NEW: MIT License as well.
+
+New in LLVM 2.9, UPDATE</p>
</div>
<!--=========================================================================-->
<div class="doc_subsection">
-<a name="dragonegg">DragonEgg: llvm-gcc ported to gcc-4.5</a>
+<a name="lldb">LLDB: Low Level Debugger</a>
</div>
<div class="doc_text">
<p>
-<a href="http://dragonegg.llvm.org/">DragonEgg</a> is a port of llvm-gcc to
-gcc-4.5. Unlike llvm-gcc, which makes many intrusive changes to the underlying
-gcc-4.2 code, dragonegg in theory does not require any gcc-4.5 modifications
-whatsoever (currently one small patch is needed). This is thanks to the new
-<a href="http://gcc.gnu.org/wiki/plugins">gcc plugin architecture</a>, which
-makes it possible to modify the behaviour of gcc at runtime by loading a plugin,
-which is nothing more than a dynamic library which conforms to the gcc plugin
-interface. DragonEgg is a gcc plugin that causes the LLVM optimizers to be run
-instead of the gcc optimizers, and the LLVM code generators instead of the gcc
-code generators, just like llvm-gcc. To use it, you add
-"-fplugin=path/dragonegg.so" to the gcc-4.5 command line, and gcc-4.5 magically
-becomes llvm-gcc-4.5!
-</p>
+<a href="http://lldb.llvm.org/">LLDB</a> is a brand new member of the LLVM
+umbrella of projects. LLDB is a next generation, high-performance debugger. It
+is built as a set of reusable components which highly leverage existing
+libraries in the larger LLVM Project, such as the Clang expression parser, the
+LLVM disassembler and the LLVM JIT.</p>
<p>
-DragonEgg is still a work in progress. Currently C works very well, while C++,
-Ada and Fortran work fairly well. All other languages either don't work at all,
-or only work poorly. For the moment only the x86-32 and x86-64 targets are
-supported, and only on linux and darwin (darwin needs an additional gcc patch).
+LLDB is in early development and not included as part of the LLVM 2.9 release,
+UPDATE!
+
+<!--
+but is mature enough to support basic debugging scenarios on Mac OS X in C,
+Objective-C and C++. We'd really like help extending and expanding LLDB to
+support new platforms, new languages, new architectures, and new features.-->
</p>
+</div>
+
+<!--=========================================================================-->
+<div class="doc_subsection">
+<a name="libc++">libc++: C++ Standard Library</a>
+</div>
+
+<div class="doc_text">
<p>
-2.8 status here.
+<a href="http://libcxx.llvm.org/">libc++</a> is another new member of the LLVM
+family. It is an implementation of the C++ standard library, written from the
+ground up to specifically target the forthcoming C++'0X standard and focus on
+delivering great performance.</p>
+
+<p>
+As of the LLVM 2.9 release, UPDATE!
+
+<!--libc++ is virtually feature complete, but would
+benefit from more testing and better integration with Clang++. It is also
+looking forward to the C++ committee finalizing the C++'0x standard.-->
</p>
</div>
+
<!--=========================================================================-->
<div class="doc_subsection">
-<a name="mc">llvm-mc: Machine Code Toolkit</a>
+<a name="klee">KLEE: A Symbolic Execution Virtual Machine</a>
</div>
<div class="doc_text">
<p>
-The LLVM Machine Code (aka MC) sub-project of LLVM was created to solve a number
-of problems in the realm of assembly, disassembly, object file format handling,
-and a number of other related areas that CPU instruction-set level tools work
-in. It is a sub-project of LLVM which provides it with a number of advantages
-over other compilers that do not have tightly integrated assembly-level tools.
-For a gentle introduction, please see the <a
-href="http://blog.llvm.org/2010/04/intro-to-llvm-mc-project.html">Intro to the
-LLVM MC Project Blog Post</a>.
+<a href="http://klee.llvm.org/">KLEE</a> is a symbolic execution framework for
+programs in LLVM bitcode form. KLEE tries to symbolically evaluate "all" paths
+through the application and records state transitions that lead to fault
+states. This allows it to construct testcases that lead to faults and can even
+be used to verify some algorithms.
</p>
-<p>2.8 status here</p>
-</div>
+<p>UPDATE!</p>
+
+</div>
<!-- *********************************************************************** -->
<div class="doc_section">
- <a name="externalproj">External Open Source Projects Using LLVM 2.8</a>
+ <a name="externalproj">External Open Source Projects Using LLVM 2.9</a>
</div>
<!-- *********************************************************************** -->
<p>An exciting aspect of LLVM is that it is used as an enabling technology for
a lot of other language and tools projects. This section lists some of the
- projects that have already been updated to work with LLVM 2.8.</p>
+ projects that have already been updated to work with LLVM 2.9.</p>
</div>
+
+
<!-- *********************************************************************** -->
<div class="doc_section">
- <a name="whatsnew">What's New in LLVM 2.8?</a>
+ <a name="whatsnew">What's New in LLVM 2.9?</a>
</div>
<!-- *********************************************************************** -->
</div>
-<!--=========================================================================-->
-<div class="doc_subsection">
-<a name="orgchanges">LLVM Community Changes</a>
-</div>
-
-<div class="doc_text">
-
-<p>In addition to changes to the code, between LLVM 2.7 and 2.8, a number of
-organization changes have happened:
-</p>
-
-<ul>
-</ul>
-</div>
-
<!--=========================================================================-->
<div class="doc_subsection">
<a name="majorfeatures">Major New Features</a>
<div class="doc_text">
-<p>LLVM 2.8 includes several major new capabilities:</p>
+<p>LLVM 2.9 includes several major new capabilities:</p>
<ul>
-<li>atomic lowering pass.</li>
-<li>RegionInfo pass: opt -regions analyze" or "opt -view-regions".
-<!-- Tobias Grosser --></li>
-<li>ARMGlobalMerge: <!-- Anton --> </li>
-<li>llvm-diff</li>
</ul>
</div>
expose new optimization opportunities:</p>
<ul>
-
-<li>LLVM 2.8 changes the internal order of operands in <a
- href="http://llvm.org/doxygen/classllvm_1_1InvokeInst.html"><tt>InvokeInst</tt></a>
- and <a href="http://llvm.org/doxygen/classllvm_1_1CallInst.html"><tt>CallInst</tt></a>.
- To be portable across releases, resort to <tt>CallSite</tt> and the
- high-level accessors, such as <tt>getCalledValue</tt> and <tt>setUnwindDest</tt>.
-</li>
-<li>
- You can no longer pass use_iterators directly to cast<> (and similar), because
- these routines tend to perform costly dereference operations more than once. You
- have to dereference the iterators yourself and pass them in.
-</li>
-<li>
- llvm.memcpy.*, llvm.memset.*, llvm.memmove.* (and possibly other?) intrinsics
- take an extra parameter now (i1 isVolatile), totaling 5 parameters.
- If you were creating these intrinsic calls and prototypes yourself (as opposed
- to using Intrinsic::getDeclaration), you can use UpgradeIntrinsicFunction/UpgradeIntrinsicCall
- to be portable accross releases.
- Note that you cannot use Intrinsic::getDeclaration() in a backwards compatible
- way (needs 2/3 types now, in 2.7 it needed just 1).
-</li>
-<li>
- SetCurrentDebugLocation takes a DebugLoc now instead of a MDNode.
- Change your code to use
- SetCurrentDebugLocation(DebugLoc::getFromDILocation(...)).
-</li>
-<li>
- VISIBILITY_HIDDEN is gone.
-</li>
-<li>
- The <tt>RegisterPass</tt> and <tt>RegisterAnalysisGroup</tt> templates are
- considered deprecated, but continue to function in LLVM 2.8. Clients are
- strongly advised to use the upcoming <tt>INITIALIZE_PASS()</tt> and
- <tt>INITIALIZE_AG_PASS()</tt> macros instead.
-<li>
- SMDiagnostic takes different parameters now. //FIXME: how to upgrade?
-</li>
-<li>
- The constructor for the Triple class no longer tries to understand odd triple
- specifications. Frontends should ensure that they only pass valid triples to
- LLVM. The Triple::normalize utility method has been added to help front-ends
- deal with funky triples.
-<li>
- Some APIs got renamed:
- <ul>
- <li>llvm_report_error -> report_fatal_error</li>
- <li>llvm_install_error_handler -> install_fatal_error_handler</li>
- <li>llvm::DwarfExceptionHandling -> llvm::JITExceptionHandling</li>
- </ul>
-</li>
</ul>
</div>
release includes a few major enhancements and additions to the optimizers:</p>
<ul>
-
-<li></li>
-
+ <li>TBAA.</li>
+ <li>LTO has been improved to use MC for parsing inline asm and now
+ can build large programs like Firefox 4 on both OS X and Linux.</li>
</ul>
-</div>
+<!--
+<p>In addition to these features that are done in 2.8, there is preliminary
+ support in the release for Type Based Alias Analysis
+ Preliminary work on TBAA but not usable in 2.8.
+ New CorrelatedValuePropagation pass, not on by default in 2.8 yet.
+-->
+</div>
<!--=========================================================================-->
<div class="doc_subsection">
-<a name="executionengine">Interpreter and JIT Improvements</a>
+<a name="mc">MC Level Improvements</a>
</div>
<div class="doc_text">
+<p>
+The LLVM Machine Code (aka MC) subsystem was created to solve a number
+of problems in the realm of assembly, disassembly, object file format handling,
+and a number of other related areas that CPU instruction-set level tools work
+in.</p>
<ul>
-<li></li>
-
+ <li>MC is now used by default for ELF systems on x86 and
+ x86-64.</li>
+ <li>MC supports and CodeGen uses the <tt>.loc</tt> directives for
+ producing line number debug info. This produces more compact line
+ tables.</li>
+ <li>MC supports the <tt>.cfi_*</tt> directives for producing DWARF
+ frame information, but it is still not used by CodeGen by default.</li>
+ <li>COFF support?</li>
</ul>
-</div>
+<p>For more information, please see the <a
+href="http://blog.llvm.org/2010/04/intro-to-llvm-mc-project.html">Intro to the
+LLVM MC Project Blog Post</a>.
+</p>
+
+</div>
+
<!--=========================================================================-->
<div class="doc_subsection">
it run faster:</p>
<ul>
-<li>MachO writer works.</li>
+<!-- SplitKit -->
+FastISel for ARM.
</ul>
</div>
</div>
<div class="doc_text">
-<p>New features of the X86 target include:
+<p>New features and major changes in the X86 target include:
</p>
<ul>
-<li>The X86 backend now supports holding X87 floating point stack values
- in registers across basic blocks, dramatically improving performance of code
- that uses long double, and when targetting CPUs that don't support SSE.</li>
-
</ul>
</div>
</p>
<ul>
-
-<li></li>
-
-</ul>
-
-
-</div>
-
-<!--=========================================================================-->
-<div class="doc_subsection">
-<a name="newapis">New Useful APIs</a>
-</div>
-
-<div class="doc_text">
-
-<p>This release includes a number of new APIs that are used internally, which
- may also be useful for external clients.
-</p>
-
-<ul>
-<li></li>
-</ul>
-
-
-</div>
-
-<!--=========================================================================-->
-<div class="doc_subsection">
-<a name="otherimprovements">Other Improvements and New Features</a>
-</div>
-
-<div class="doc_text">
-<p>Other miscellaneous features include:</p>
-
-<ul>
-<li></li>
</ul>
-
</div>
<div class="doc_text">
<p>If you're already an LLVM user or developer with out-of-tree changes based
-on LLVM 2.7, this section lists some "gotchas" that you may run into upgrading
+on LLVM 2.8, this section lists some "gotchas" that you may run into upgrading
from the previous release.</p>
<ul>
-<li>.ll file doesn't produce #uses comments anymore, to get them, run a .bc file
- through "llvm-dis --show-annotations".</li>
-<li>MSIL Backend removed.</li>
-<li>ABCD and SSI passes removed.</li>
-<li>'Union' LLVM IR feature removed.</li>
</ul>
+
+
<p>In addition, many APIs have changed in this release. Some of the major LLVM
API changes are:</p>
-
<ul>
</ul>
</div>
-
-
-<!-- *********************************************************************** -->
-<div class="doc_section">
- <a name="portability">Portability and Supported Platforms</a>
+<!--=========================================================================-->
+<div class="doc_subsection">
+<a name="devtree_changes">Development Infrastructure Changes</a>
</div>
-<!-- *********************************************************************** -->
<div class="doc_text">
-<p>LLVM is known to work on the following platforms:</p>
+<p>This section lists changes to the LLVM development infrastructure. This
+mostly impacts users who actively work on LLVM or follow development on
+mainline, but may also impact users who leverage the LLVM build infrastructure
+or are interested in LLVM qualification.</p>
<ul>
-<li>Intel and AMD machines (IA32, X86-64, AMD64, EMT-64) running Red Hat
- Linux, Fedora Core, FreeBSD and AuroraUX (and probably other unix-like
- systems).</li>
-<li>PowerPC and X86-based Mac OS X systems, running 10.4 and above in 32-bit
- and 64-bit modes.</li>
-<li>Intel and AMD machines running on Win32 using MinGW libraries (native).</li>
-<li>Intel and AMD machines running on Win32 with the Cygwin libraries (limited
- support is available for native builds with Visual C++).</li>
-<li>Sun x86 and AMD64 machines running Solaris 10, OpenSolaris 0906.</li>
-<li>Alpha-based machines running Debian GNU/Linux.</li>
</ul>
-
-<p>The core LLVM infrastructure uses GNU autoconf to adapt itself
-to the machine and operating system on which it is built. However, minor
-porting may be required to get LLVM to work on new platforms. We welcome your
-portability patches and reports of successful builds or error messages.</p>
-
</div>
<!-- *********************************************************************** -->
href="http://llvm.org/bugs/">LLVM bug database</a> and submit a bug if
there isn't already one.</p>
-<ul>
-<li>LLVM will not correctly compile on Solaris and/or OpenSolaris
-using the stock GCC 3.x.x series 'out the box',
-See: <a href="GettingStarted.html#brokengcc">Broken versions of GCC and other tools</a>.
-However, A <a href="http://pkg.auroraux.org/GCC">Modern GCC Build</a>
-for x86/x86-64 has been made available from the third party AuroraUX Project
-that has been meticulously tested for bootstrapping LLVM & Clang.</li>
-<li>There have been reports of Solaris and/or OpenSolaris build failures due
-to an incompatibility in the nm program as well. The nm from binutils does seem
-to work.</li>
-</ul>
-
</div>
<!-- ======================================================================= -->
href="http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVMdev list</a>.</p>
<ul>
-<li>The Alpha, SPU, MIPS, PIC16, Blackfin, MSP430, SystemZ and MicroBlaze
- backends are experimental.</li>
-<li><tt>llc</tt> "<tt>-filetype=asm</tt>" (the default) is the only
- supported value for this option. XXX Update me</li>
+<li>The Alpha, Blackfin, CellSPU, MicroBlaze, MSP430, MIPS, PTX, SystemZ
+ and XCore backends are experimental.</li>
+<li><tt>llc</tt> "<tt>-filetype=obj</tt>" is experimental on all targets
+ other than darwin-i386 and darwin-x86_64. FIXME: Not true on ELF anymore?</li>
+
</ul>
</div>
<div class="doc_text">
+<p>The C backend has numerous problems and is not being actively maintained.
+Depending on it for anything serious is not advised.</p>
+
<ul>
<li><a href="http://llvm.org/PR802">The C backend has only basic support for
inline assembly code</a>.</li>
<!-- ======================================================================= -->
<div class="doc_subsection">
- <a name="c-fe">Known problems with the llvm-gcc C and C++ front-end</a>
+ <a name="llvm-gcc">Known problems with the llvm-gcc front-end</a>
</div>
<div class="doc_text">
-<p>The only major language feature of GCC not supported by llvm-gcc is
- the <tt>__builtin_apply</tt> family of builtins. However, some extensions
- are only supported on some targets. For example, trampolines are only
- supported on some targets (these are used when you take the address of a
- nested function).</p>
+<p>llvm-gcc is generally very stable for the C family of languages. The only
+ major language feature of GCC not supported by llvm-gcc is the
+ <tt>__builtin_apply</tt> family of builtins. However, some extensions
+ are only supported on some targets. For example, trampolines are only
+ supported on some targets (these are used when you take the address of a
+ nested function).</p>
-</div>
-
-<!-- ======================================================================= -->
-<div class="doc_subsection">
- <a name="fortran-fe">Known problems with the llvm-gcc Fortran front-end</a>
-</div>
+<p>Fortran support generally works, but there are still several unresolved bugs
+ in <a href="http://llvm.org/bugs/">Bugzilla</a>. Please see the
+ tools/gfortran component for details. Note that llvm-gcc is missing major
+ Fortran performance work in the frontend and library that went into GCC after
+ 4.2. If you are interested in Fortran, we recommend that you consider using
+ <a href="#dragonegg">dragonegg</a> instead.</p>
-<div class="doc_text">
-<ul>
-<li>Fortran support generally works, but there are still several unresolved bugs
- in <a href="http://llvm.org/bugs/">Bugzilla</a>. Please see the
- tools/gfortran component for details.</li>
-</ul>
-</div>
-
-<!-- ======================================================================= -->
-<div class="doc_subsection">
- <a name="ada-fe">Known problems with the llvm-gcc Ada front-end</a>
-</div>
-
-<div class="doc_text">
-The llvm-gcc 4.2 Ada compiler works fairly well; however, this is not a mature
-technology, and problems should be expected.
-<ul>
-<li>The Ada front-end currently only builds on X86-32. This is mainly due
-to lack of trampoline support (pointers to nested functions) on other platforms.
-However, it <a href="http://llvm.org/PR2006">also fails to build on X86-64</a>
-which does support trampolines.</li>
-<li>The Ada front-end <a href="http://llvm.org/PR2007">fails to bootstrap</a>.
-This is due to lack of LLVM support for <tt>setjmp</tt>/<tt>longjmp</tt> style
-exception handling, which is used internally by the compiler.
-Workaround: configure with <tt>--disable-bootstrap</tt>.</li>
-<li>The c380004, <a href="http://llvm.org/PR2010">c393010</a>
-and <a href="http://llvm.org/PR2421">cxg2021</a> ACATS tests fail
-(c380004 also fails with gcc-4.2 mainline).
-If the compiler is built with checks disabled then <a href="http://llvm.org/PR2010">c393010</a>
-causes the compiler to go into an infinite loop, using up all system memory.</li>
-<li>Some GCC specific Ada tests continue to crash the compiler.</li>
-<li>The <tt>-E</tt> binder option (exception backtraces)
-<a href="http://llvm.org/PR1982">does not work</a> and will result in programs
-crashing if an exception is raised. Workaround: do not use <tt>-E</tt>.</li>
-<li>Only discrete types <a href="http://llvm.org/PR1981">are allowed to start
-or finish at a non-byte offset</a> in a record. Workaround: do not pack records
-or use representation clauses that result in a field of a non-discrete type
-starting or finishing in the middle of a byte.</li>
-<li>The <tt>lli</tt> interpreter <a href="http://llvm.org/PR2009">considers
-'main' as generated by the Ada binder to be invalid</a>.
-Workaround: hand edit the file to use pointers for <tt>argv</tt> and
-<tt>envp</tt> rather than integers.</li>
-<li>The <tt>-fstack-check</tt> option <a href="http://llvm.org/PR2008">is
-ignored</a>.</li>
-</ul>
+<p>The llvm-gcc 4.2 Ada compiler has basic functionality, but is no longer being
+actively maintained. If you are interested in Ada, we recommend that you
+consider using <a href="#dragonegg">dragonegg</a> instead.</p>
</div>
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