electron/docs/development/build-instructions-windows.md

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# Build instructions (Windows)
## Prerequisites
* Windows 2008 at least
* Visual Studio 2013
* [Python 2.7](http://www.python.org/download/releases/2.7/)
* 32bit [node.js](http://nodejs.org/)
* [git](http://git-scm.com)
The instructions below are executed under [cygwin](http://www.cygwin.com),
but it's not a requirement, you can also build atom-shell under the Windows
command prompt or other terminals.
The building of atom-shell is done entirely with command-line scripts, so you
can use any editor you like to develop atom-shell, but it also means you can
not use Visual Studio for the development. Support of building with Visual
Studio will come in the future.
**Note:** Even though Visual Studio is not used for building, it's still
**required** because we need the build toolchains it provided.
## Getting the code
```bash
$ git clone https://github.com/atom/atom-shell.git
```
## Bootstrapping
The bootstrap script will download all necessary build dependencies and create
build project files. Notice that we're using `ninja` to build atom-shell so
there is no Visual Studio project generated.
```bash
$ cd atom-shell
$ python script/bootstrap.py
```
## Building
Build both Release and Debug targets:
```bash
$ python script/build.py
```
You can also only build the Debug target:
```bash
$ python script/build.py -c Debug
```
After building is done, you can find `atom.exe` under `out\Debug`.
## 64bit support
Currently atom-shell can only be built for 32bit target on Windows, support for
64bit will come in future.
## Tests
```bash
$ python script/test.py
```
## Troubleshooting
### Command xxxx not found
If you encountered an error like `Command xxxx not found`, you may try to use
the `VS2012 Command Prompt` console to execute the build scripts.
### Assertion failed: ((handle))->activecnt >= 0
When building under cygwin, you could see `bootstrap.py` failed with following
error:
```
Assertion failed: ((handle))->activecnt >= 0, file src\win\pipe.c, line 1430
Traceback (most recent call last):
File "script/bootstrap.py", line 87, in <module>
sys.exit(main())
File "script/bootstrap.py", line 22, in main
update_node_modules('.')
File "script/bootstrap.py", line 56, in update_node_modules
execute([NPM, 'install'])
File "/home/zcbenz/codes/raven/script/lib/util.py", line 118, in execute
raise e
subprocess.CalledProcessError: Command '['npm.cmd', 'install']' returned non-zero exit status 3
```
This is caused by a bug when using cygwin python and win32 node together. The
solution is to use the win32 python to execute the bootstrap script (supposing
you have installed python under `C:\Python27`):
```bash
/cygdrive/c/Python27/python.exe script/bootstrap.py
```
### LNK1181: cannot open input file 'kernel32.lib'
Try reinstalling 32bit node.js.