Try to clarify which compilers can be used for the
build.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47211 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/docs/GCCFEBuildInstrs.html b/docs/GCCFEBuildInstrs.html
index 289bda3..0c67534 100644
--- a/docs/GCCFEBuildInstrs.html
+++ b/docs/GCCFEBuildInstrs.html
@@ -92,12 +92,13 @@
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