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The Ada front-end from the LLVM 2.2 release 

cannot be build with GNAT GPL 2006, only with
GNAT GPL 2005.

llvm-svn: 49529
This commit is contained in:
Duncan Sands 2008-04-11 13:24:43 +00:00
parent c422383e08
commit 21285fc04c
1 changed files with 9 additions and 7 deletions
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16
llvm/docs/GCCFEBuildInstrs.html
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@ -92,21 +92,23 @@ top-level <tt>README.LLVM</tt> file, adding ",ada" to EXTRALANGS, for example:
systems without some work.</p></li>
<li><p>The build requires having a compiler that supports Ada, C and C++.
The Ada front-end is written in Ada so an Ada compiler is needed to
build it. Appropriate Ada compilers are gcc-4.2 (or earlier) or the
<a href="http://libre.adacore.com/">2006 GNAT GPL Edition</a>
(or earlier). As a general rule, the Ada compiler used for the
build must not be more recent than the Ada compiler it is building.
This is why the build fails with gcc-4.3 and the 2007 GNAT GPL Edition.
build it. Compilers known to work with the
<a href="http://llvm.org/releases/download.html">LLVM 2.2 release</a>
are <a href="http://gcc.gnu.org/releases.html">gcc-4.2</a> and the
<a href="http://libre.adacore.com/">2005 GNAT GPL Edition</a>.
<a href="GettingStarted.html#checkout">LLVM from subversion</a>
also works with the
<a href="http://libre.adacore.com/">2006 and 2007 GNAT GPL Editions</a>.
The LLVM parts of llvm-gcc are written in C++ so a C++ compiler is
needed to build them. The rest of gcc is written in C.
Some linux distributions provide a version of gcc that supports all
three languages (the Ada part often comes as an add-on package to
the rest of gcc). Otherwise it is possible to combine two versions
of gcc, one that supports Ada and C (such as the
<a href="http://libre.adacore.com/">2006 GNAT GPL Edition</a>)
<a href="http://libre.adacore.com/">2005 GNAT GPL Edition</a>)
and another which supports C++, see below.</p></li>
<li><p>Because the Ada front-end is experimental, it is wise to build the
compiler with checking enabled. This causes it to run slower, but
compiler with checking enabled. This causes it to run much slower, but
helps catch mistakes in the compiler (please report any problems using
<a href="http://llvm.org/bugs">LLVM bugzilla</a>).</p></li>
</ol>