This section describes how to acquire and build llvm-gcc 4.0 and 4.2, which are -based on the GCC 4.0.1/4.2.1 front-ends respectively. Both front-ends support C, -C++, Objective-C and Objective-C++. The 4.2 front-end also supports Ada and -Fortran to some extent. Note that the instructions for building these front-ends -are completely different (and much easier!) than those for building llvm-gcc3 in -the past.
+This section describes how to acquire and build llvm-gcc 4.2, which is based +on the GCC 4.2.1 front-end. Supported languages are Ada, C, C++, Fortran, +Objective-C and Objective-C++. Note that the instructions for building these +front-ends are completely different (and much easier!) than those for building +llvm-gcc3 in the past.
Retrieve the appropriate llvm-gcc4.x-y.z.source.tar.gz archive from the +
Retrieve the appropriate llvm-gcc-4.2-x.y.source.tar.gz archive from the llvm web site.
It is also possible to download the sources of the llvm-gcc front end - from a read-only mirror using subversion. To check out the 4.0 code + from a read-only mirror using subversion. To check out the 4.2 code for first time use:
--svn co http://llvm.org/svn/llvm-project/llvm-gcc-4.0/trunk dst-directory --
To check out the 4.2 code use:
-svn co http://llvm.org/svn/llvm-project/llvm-gcc-4.2/trunk dst-directory @@ -93,19 +84,17 @@ top-level README.LLVM file, adding ",ada" to EXTRALANGS, for example:
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. Compilers known to work with the - LLVM 2.2 release + LLVM 2.3 release are gcc-4.2 and the - 2005 GNAT GPL Edition. - LLVM from subversion - also works with the - 2006 and 2007 GNAT GPL Editions. + 2005, 2006 and 2007 versions of the + 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 of gcc, one that supports Ada and C (such as the - 2005 GNAT GPL Edition) + 2007 GNAT GPL Edition) and another which supports C++, see below.
Because the Ada front-end is experimental, it is wise to build the compiler with checking enabled. This causes it to run much slower, but @@ -121,9 +110,9 @@ top-level README.LLVM file, adding ",ada" to EXTRALANGS, for example: and unpack it:
wget http://llvm.org/releases/2.2/llvm-2.2.tar.gz -tar xzf llvm-2.2.tar.gz -mv llvm-2.2 llvm+
wget http://llvm.org/releases/2.3/llvm-2.3.tar.gz +tar xzf llvm-2.3.tar.gz +mv llvm-2.3 llvm
or check out the @@ -139,9 +128,9 @@ mv llvm-2.2 llvm and unpack it:
wget http://llvm.org/releases/2.2/llvm-gcc4.2-2.2.source.tar.gz -tar xzf llvm-gcc4.2-2.2.source.tar.gz -mv llvm-gcc4.2-2.2.source llvm-gcc-4.2+
wget http://llvm.org/releases/2.3/llvm-gcc-4.2-2.3.source.tar.gz +tar xzf llvm-gcc-4.2-2.3.source.tar.gz +mv llvm-gcc4.2-2.3.source llvm-gcc-4.2