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Try to clarify which compilers can be used for the

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build.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47211 91177308-0d34-0410-b5e6-96231b3b80d8
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Duncan Sands 2008-02-16 09:47:41 +00:00
parent 559f4224d6
commit 17bcde9f9b
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docs/GCCFEBuildInstrs.html
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@ -92,12 +92,13 @@ 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. What is more, the Ada compiler must not be more recent
than what it is trying to compile, otherwise the build will fail.
This rules out gcc-4.3 (but not gcc-4.2) and also the
<a href="http://libre.adacore.com/">2007 GNAT GPL Edition</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.
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.
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