Eliminate a redundant check. This speeds up optimization of 253.perlbmk from 13...

[oota-llvm.git] / docs / GettingStarted.html

diff --git a/docs/GettingStarted.html b/docs/GettingStarted.html
index 099b7d745040f77ae3465255b2be1cdb707a3bac..123f0b4589aecb3a5cd22f92d968d694555fc5d1 100644 (file)
--- a/docs/GettingStarted.html
+++ b/docs/GettingStarted.html
@@ -19,7 +19,7 @@
     <ol>
       <li><a href="#hardware">Hardware</a>
       <li><a href="#software">Software</a>
-      <li><a href="#brokengcc">Broken versions of GCC</a>
+      <li><a href="#brokengcc">Broken versions of GCC and other tools</a>
     </ol></li>
 
   <li><a href="#starting">Getting Started with LLVM</a>
@@ -491,7 +491,7 @@ href="CFEBuildInstrs.html">try to compile it</a> on your platform.</p>
 
 <!-- ======================================================================= -->
 <div class="doc_subsection">
-  <a name="brokengcc">Broken versions of GCC</a>
+  <a name="brokengcc">Broken versions of GCC and other tools</a>
 </div>
 
 <div class="doc_text">
@@ -499,8 +499,8 @@ href="CFEBuildInstrs.html">try to compile it</a> on your platform.</p>
 <p>LLVM is very demanding of the host C++ compiler, and as such tends to expose
 bugs in the compiler.  In particular, several versions of GCC crash when trying
 to compile LLVM.  We routinely use GCC 3.3.3, 3.4.0, and Apple 4.0.1 
-successfully with them (however, see below).  Other versions of GCC will 
-probably work as well.  GCC versions listed
+successfully with them (however, see important notes below).  Other versions 
+of GCC will probably work as well.  GCC versions listed
 here are known to not work.  If you are using one of these versions, please try
 to upgrade your GCC to something more recent.  If you run into a problem with a
 version of GCC not listed here, please <a href="mailto:llvmdev@cs.uiuc.edu">let
@@ -525,6 +525,13 @@ the "<tt>convert_from_eh_region_ranges_1</tt>" GCC function.</p>
    possibly others) does not compile LLVM correctly (it appears that exception 
    handling is broken in some cases).  Please download the FSF 3.3.3 or upgrade
    to a newer version of GCC.</p>
+<p><b>GCC 3.4.0</b> on linux/x86 (32-bit)</b>: GCC miscompiles portions of the 
+   code generator, causing an infinite loop in the llvm-gcc build when built
+   with optimizations enabled (i.e. a release build).</p>
+<p><b>GCC 3.4.2</b> on linux/x86 (32-bit)</b>: GCC miscompiles portions of the 
+   code generator at -O3, as with 3.4.0.  However gcc 3.4.2 (unlike 3.4.0)
+   correctly compiles LLVM at -O2.  A work around is to build release LLVM
+   builds with "make ENABLE_OPTIMIZED=1 OPTIMIZE_OPTION=-O2 ..."</p>
 <p><b>GCC 3.4.x</b> on X86-64/amd64</b>: GCC <a href="http://llvm.org/PR1056">
    miscompiles portions of LLVM</a>.</p>
 <p><b>IA-64 GCC 4.0.0</b>: The IA-64 version of GCC 4.0.0 is known to
@@ -539,11 +546,19 @@ the "<tt>convert_from_eh_region_ranges_1</tt>" GCC function.</p>
    miscompiles portions of LLVM</a> when compiling llvm itself into 64-bit 
    code.  LLVM will appear to mostly work but will be buggy, e.g. failing 
    portions of its testsuite.</p>
+<p><b>GCC 4.1.2 on OpenSUSE</b>: Seg faults during libstdc++ build and on x86_64
+platforms compiling md5.c gets a mangled constant.</p>
 <p><b>GNU ld 2.16.X</b>. Some 2.16.X versions of the ld linker will produce very
 long warning messages complaining that some ".gnu.linkonce.t.*" symbol was
 defined in a discarded section. You can safely ignore these messages as they are
 erroneous and the linkage is correct.  These messages disappear using ld
 2.17.</p>
+
+<p><b>GNU binutils 2.17</b>: Binutils 2.17 contains <a 
+href="http://sourceware.org/bugzilla/show_bug.cgi?id=3111">a bug</a> which
+causes huge link times (minutes instead of seconds) when building LLVM.  We
+recommend upgrading to a newer version (2.17.50.0.4 or later).</p>
+
 </div>
 
 
@@ -692,6 +707,7 @@ revision), you can specify a label.  The following releases have the following
 labels:</p>
 
 <ul>
+<li>Release 2.0: <b>RELEASE_20</b></li>
 <li>Release 1.9: <b>RELEASE_19</b></li>
 <li>Release 1.8: <b>RELEASE_18</b></li>
 <li>Release 1.7: <b>RELEASE_17</b></li>
@@ -1442,7 +1458,7 @@ are code generators for parts of LLVM infrastructure.</p>
   directory, switch to directory <tt>llvm/tools/llc</tt> and build it,
   causing a re-linking of LLC.<br><br>
 
-  <dt><tt><b>NightlyTest.pl</b></tt> and
+  <dt><tt><b>NewNightlyTest.pl</b></tt> and
   <tt><b>NightlyTestTemplate.html</b></tt> <dd>These files are used in a
   cron script to generate nightly status reports of the functionality of
   tools, and the results can be seen by following the appropriate link on