How to Build Mercurial on Windows
This how-to is intended to give some hints about how to build Mercurial on Windows from the Mercurial sources. If you don't intend to fiddle with the sources, then simply use a pre-built binary package for Windows (for example TortoiseHg, or http://mercurial.berkwood.com/, see Download). If you want to build an installer or Py2exe distribution, see BuildingWindowsInstaller.
Mercurial is mostly programmed in Python (http://www.python.org/). The Python sources don't need a compilation step, but a few Mercurial modules are programmed in C: base85.c, bdiff.c, diffhelpers.c, mpatch.c and osutil.c (http://selenic.com/repo/hg/file/tip/mercurial/). These must be compiled with a C-compiler.
The steps below worked on a Windows XP SP2, that had a Microsoft Visual C++ installed, and on Windows XP SP2, with mingw installed.
The bug tracker entry "windows installation requires MS C compiler" at http://www.selenic.com/mercurial/bts/issue1109 has some hints about using the free mingw port of the gcc compiler instead.
Install Python 2.5, available from http://www.python.org/download/windows/
Default install path is C:\Python25. Best leave it at that.
Get the Mercurial sources (assuming you already have a working "hg" installed, see for example http://mercurial.berkwood.com/)
>cd C:\tmp\repos >hg clone http://selenic.com/repo/hg mercurial
Mercurial uses the "Python Distribution Utilities (Distutils)" install process, which also covers building of the extension modules (the files written in C-Code). See http://docs.python.org/inst/inst.html in the Python docs at http://docs.python.org/index.html.
The first step is doing a python setup.py build at the top level directory of the Mercurial package. If using mingw, a setup.cfg needs to be created which directs setuptools to use it:
cd mercurial echo [build] > setup.cfg echo compiler=mingw32 >> setup.cfg
For mingw32 using python built using Microsoft Visual Studio (If you have downloaded python installer from main python site or activestate, they are built using MS Visual Studio), you need to create an import library (archive file) for the GCC (Mingw32) toolset:
Make sure you read the instructions on creating a GCC compatible import archive from a MSVC built DLL
- Download the prerequisites "pexports" and "dlltool" and make sure they are in the PATH
- Assuming the python interpreter is installed under "c:\python" and you are using python 2.6 (if different, change accordingly)
>cd c:\python\libs >pexports c:\windows\system32\python26.dll > python26.def >dlltool -C -d python26.def -l libpython26.a >nm libpython26.a
- The last command "nm" should show you the exported symbols with "I" (as import symbol)
- If for some reason the above step does not work when you try to build "hg" (undefined symbol error due to extra "_"), try editing the "python26.def" file and remove the string "DATA" and rerun the "dlltool"
>cd mercurial >python setup.py build running build running build_py creating build creating build\lib.win32-2.5 creating build\lib.win32-2.5\mercurial copying mercurial\ancestor.py -> build\lib.win32-2.5\mercurial copying mercurial\archival.py -> build\lib.win32-2.5\mercurial copying mercurial\bundlerepo.py -> build\lib.win32-2.5\mercurial ... building 'mercurial.mpatch' extension creating build\temp.win32-2.5 creating build\temp.win32-2.5\Release creating build\temp.win32-2.5\Release\mercurial C:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\bin\cl.exe /c /nologo /Ox /MD /W3 /GX /DNDEBUG -IC:\Python25\include -IC:\Python25\PC /Tcmercurial/mpatch.c /Fobuild\temp.win32-2.5\Release\mercurial/mpatch.obj mpatch.c C:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\bin\link.exe /DLL /nologo /INCREMENTAL:NO /LIBPATH:C:\Python25\libs /LIBPATH:C:\Python25\PCBuild /EXPORT:initmpatch build\temp.win32-2.5\Release\mercurial/mpatch.obj /OUT:build\lib.win32-2.5\mercurial\mpatch.pyd /IMPLIB:build\temp.win32-2.5\Release\mercurial\mpatch.lib Creating library build\temp.win32-2.5\Release\mercurial\mpatch.lib and object build\temp.win32-2.5\Release\mercurial\mpatch.exp ... running build_scripts creating build\scripts-2.5 copying and adjusting hg -> build\scripts-2.5
In the above example, Python found and used an installed Microsoft C compiler. The C-source files are compiled and linked into windows dll files using the file extension ".pyd". If the above step fails, you can find some additional tips in WindowsInstall. See also "Extending and Embedding the Python Interpreter" and the more specific "Building C and C++ Extensions on Windows" in the Python docs.
Execute python setup.py install
> python setup.py install running install running build running build_py running build_ext running build_scripts running install_lib copying build\lib.win32-2.5\hgext\acl.py -> C:\Python25\Lib\site-packages\hgext ... copying build\lib.win32-2.5\mercurial\ancestor.py -> C:\Python25\Lib\site-packages\mercurial ... byte-compiling C:\Python25\Lib\site-packages\hgext\acl.py to acl.pyc ... byte-compiling C:\Python25\Lib\site-packages\mercurial\ancestor.py to ancestor.pyc ... running install_scripts copying build\scripts-2.5\hg -> C:\Python25\Scripts running install_data creating C:\Python25\Lib\site-packages\mercurial\templates copying templates\changelog.tmpl -> C:\Python25\Lib\site-packages\mercurial\templates copying templates\changelogentry.tmpl -> C:\Python25\Lib\site-packages\mercurial\templates ... running install_egg_info Writing C:\Python25\Lib\site-packages\mercurial-fb259a3572e9-py2.5.egg-info
This installs hg in C:\Python25\Scripts:
> python C:\Python25\Scripts\hg version Mercurial Distributed SCM (version fb259a3572e9) Copyright (C) 2005-2008 Matt Mackall <firstname.lastname@example.org> and others This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
Local install for testing/development
If you want to have a locally ready to run Mercurial (for example for testing your patches, etc.), you can use the following batch file (named it "build-win32-2.5.cmd"):
del mercurial\*.pyd rd /S /Q build python setup.py build copy build\lib.win32-2.5\mercurial\*.pyd mercurial
Run it from the working directory of your cloned repo. This will copy the compiled C modules (the *.pyd files) into the mercurial directory, giving you a ready to run local hg command.