Using LLVM with MobaXterm

A simple guide to to getting LLVM to compile in Windows using MobaXterm (and to a lesser extend Cygwin)

**Note: All of the links in this guide open in new windows/tabs.

Setting up the Compilation Environment:

1. Download MobaXterm from MobaXterm's website here.

2. Download the following plugins from MobaXterm's Plugins Listing here and place them into your MobaXterm directory:

   1. Gcc, G++, and development tools

   2. (for Compiling LLVM)

   3. Perl

   4. (for Utilities)

   5. Subversion (SVN)

   6. (for the LLVM repository)

   7. Tcl / Tk / Expect

      1. (for the Automated test suite?)

3. Download the following additional 3rd party plugins from my website here and place them into your MobaXterm directory:

   1. CMake

   2. (for building LLVM. See here for details)

   3. Graphviz

      1. (for viewGraph() functionality. See here for details)

   4. Python

      1. (needed by LLVM-lit)

Downloading the Sources:

(see here for details)

1. Choose a directory were you want to place the LLVM source code.

2. download the LLVM source code:

   1. cd /path/to/llvm-src-code

   2. svn co https://llvm.org/svn/llvm-project/llvm/trunk llvm

3. Download the Clang source code:

   1. cd /path/to/llvm-src-code

   2. cd llvm/tools

   3. svn co https://llvm.org/svn/llvm-project/cfe/trunk clang

Compiling LLVM (MobaXterm/Cygwin specific):

1. Setup the linker to support a large heap size (otherwise debug builds will fail when linking lto and libclang):

   1. peflags --bigaddr=1 /bin/ld

      1. (see here for details)

2. Setup the build directory:

   1. Choose a directory where you want to compile llvm.

   2. cd /path/to/llvm-build-directory

   3. cmake -DCMAKE_BUILD_TYPE:STRING=Debug /path/to/llvm-source-code

      1. (Change the build type to Release for the non-debug build)

3. Compiling

   1. make all

   2. make check

   3. peflags --bigaddr=1 /path/to/llvm-build-directory/bin/clang

      1. (for large heap size or it will fail to call its low level driver)

   4. peflags --bigaddr=1 /path/to/llvm-build-directory/bin/clang-x.x

      1. (where x.x is the version number)

Additional Notes:

• You will need to run peflags on /bin/ld everytime you start MobaXterm. It would be pertinent to enable a persistent HOME directory in MobaXterm's preferences and add the line to ~/.bash_profile.

• You will need to run peflags on clang every time you recompile.

References:

• http://mobaxterm.mobatek.net/

• http://mobaxterm.mobatek.net/plugins.html

• http://llvm.org/docs/CMake.html

• http://llvm.org/docs/ProgrammersManual.html#ViewGraph

• http://llvm.org/docs/GettingStarted.html

• http://cygwin.com/cygwin-ug-net/setup-maxmem.html

Questions/Comments/Corrections?

• See my Contact page.