## Chapter 17. Installation from Source Code on Windows

It is recommended that most users download the binary distribution for Windows, available as a graphical installer package from the PostgreSQL website. Building from source is only intended for people developing PostgreSQL or extensions.

There are several different ways of building PostgreSQL on Windows. The simplest way to build with Microsoft tools is to install Visual Studio 2022 and use the included compiler. It is also possible to build with the full Microsoft Visual C++ 2013 to 2022. In some cases that requires the installation of the Windows SDK in addition to the compiler.

It is also possible to build PostgreSQL using the GNU compiler tools provided by MinGW, or using Cygwin for older versions of Windows.

Building using MinGW or Cygwin uses the normal build system, see Chapter 16 and the specific notes in Section 16.7.4 and Section 16.7.2. To produce native 64 bit binaries in these environments, use the tools from MinGW-w64. These tools can also be used to cross-compile for 32 bit and 64 bit Windows targets on other hosts, such as Linux and macOS. Cygwin is not recommended for running a production server, and it should only be used for running on older versions of Windows where the native build does not work. The official binaries are built using Visual Studio.

Native builds of psql don't support command line editing. The Cygwin build does support command line editing, so it should be used where psql is needed for interactive use on Windows.

## 17.1. Building with Visual C++ or the Microsoft Windows SDK

PostgreSQL can be built using the Visual C++ compiler suite from Microsoft. These compilers can be either from Visual Studio, Visual Studio Express or some versions of the Microsoft Windows SDK. If you do not already have a Visual Studio environment set up, the easiest ways are to use the compilers from Visual Studio 2022 or those in the Windows SDK 10, which are both free downloads from Microsoft.

Both 32-bit and 64-bit builds are possible with the Microsoft Compiler suite. 32-bit PostgreSQL builds are possible with Visual Studio 2013 to Visual Studio 2022, as well as standalone Windows SDK releases 8.1a to 10. 64-bit PostgreSQL builds are supported with Microsoft Windows SDK version 8.1a to 10 or Visual Studio 2013 and above. Compilation is supported down to Windows 7 and Windows Server 2008 R2 SP1 when building with Visual Studio 2013 to Visual Studio 2022.

The tools for building using Visual C++ or Platform SDK are in the `src/tools/msvc` directory. When building, make sure there are no tools from MinGW or Cygwin present in your system PATH. Also, make sure you have all the required Visual C++ tools available in the PATH. In Visual Studio, start the Visual Studio Command Prompt. If you wish to build a 64-bit version, you must use the 64-bit version of the command, and vice versa. Starting with Visual Studio 2017 this can be done from the command line using `VsDevCmd.bat`, see `-help` for the available options and their default values. `vsvars32.bat` is available in Visual Studio 2015 and earlier versions for the same purpose. From the Visual Studio Command Prompt, you can change the targeted CPU architecture, build type, and target OS by using the `vcvarsall.bat` command, e.g., `vcvarsall.bat x64 10.0.10240.0` to target Windows 10 with a 64-bit release build. See `-help` for the other options of `vcvarsall.bat`. All commands should be run from the `src\tools\msvc` directory.

Before you build, you can create the file `config.pl` to reflect any configuration options you want to change, or the paths to any third party libraries to use. The complete configuration is determined by first reading and parsing the file `config_default.pl`, and then apply any changes from `config.pl`. For example, to specify the location of your Python installation, put the following in `config.pl`:

    $config->{python} = 'c:\python26';

You only need to specify those parameters that are different from what's in `config_default.pl`.

If you need to set any other environment variables, create a file called `buildenv.pl` and put the required commands there. For example, to add the path for bison when it's not in the PATH, create a file containing:

    $ENV{PATH}=$ENV{PATH} . ';c:\some\where\bison\bin';

To pass additional command line arguments to the Visual Studio build command (msbuild or vcbuild):

    $ENV{MSBFLAGS}="/m";

### 17.1.1. Requirements

The following additional products are required to build PostgreSQL. Use the `config.pl` file to specify which directories the libraries are available in.

Microsoft Windows SDK

  If your build environment doesn't ship with a supported version of the Microsoft Windows SDK it is recommended that you upgrade to the latest version (currently version 10), available for download from https://www.microsoft.com/download.

  You must always include the Windows Headers and Libraries part of the SDK. If you install a Windows SDK including the Visual C++ Compilers, you don't need Visual Studio to build. Note that as of Version 8.0a the Windows SDK no longer ships with a complete command-line build environment.

ActiveState Perl

  ActiveState Perl is required to run the build generation scripts. MinGW or Cygwin Perl will not work. It must also be present in the PATH. Binaries can be downloaded from https://www.activestate.com (Note: version 5.8.3 or later is required, the free Standard Distribution is sufficient).

The following additional products are not required to get started, but are required to build the complete package. Use the `config.pl` file to specify which directories the libraries are available in.

ActiveState TCL

  Required for building PL/Tcl (Note: version 8.4 is required, the free Standard Distribution is sufficient).

Bison and Flex

  Bison and Flex are required to build from Git, but not required when building from a release file. Only Bison 1.875 or versions 2.2 and later will work. Flex must be version 2.5.31 or later.

  Both Bison and Flex are included in the msys tool suite, available from http://www.mingw.org/wiki/MSYS as part of the MinGW compiler suite.

  You will need to add the directory containing `flex.exe` and `bison.exe` to the PATH environment variable in `buildenv.pl` unless they are already in PATH. In the case of MinGW, the directory is the `\msys\1.0\bin` subdirectory of your MinGW installation directory.

  ### Note

  The Bison distribution from GnuWin32 appears to have a bug that causes Bison to malfunction when installed in a directory with spaces in the name, such as the default location on English installations `C:\Program Files\GnuWin32`. Consider installing into `C:\GnuWin32` or use the NTFS short name path to GnuWin32 in your PATH environment setting (e.g., `C:\PROGRA~1\GnuWin32`).

  ### Note

  The obsolete `winflex` binaries distributed on the PostgreSQL FTP site and referenced in older documentation will fail with “flex: fatal internal error, exec failed” on 64-bit Windows hosts. Use Flex from MSYS instead.

Diff

  Diff is required to run the regression tests, and can be downloaded from http://gnuwin32.sourceforge.net.

Gettext

  Gettext is required to build with NLS support, and can be downloaded from http://gnuwin32.sourceforge.net. Note that binaries, dependencies and developer files are all needed.

MIT Kerberos

  Required for GSSAPI authentication support. MIT Kerberos can be downloaded from https://web.mit.edu/Kerberos/dist/index.html.

libxml2 and libxslt

  Required for XML support. Binaries can be downloaded from https://zlatkovic.com/pub/libxml or source from http://xmlsoft.org. Note that libxml2 requires iconv, which is available from the same download location.

OpenSSL

  Required for SSL support. Binaries can be downloaded from https://slproweb.com/products/Win32OpenSSL.html or source from https://www.openssl.org.

ossp-uuid

  Required for UUID-OSSP support (contrib only). Source can be downloaded from http://www.ossp.org/pkg/lib/uuid/.

Python

  Required for building PL/Python. Binaries can be downloaded from https://www.python.org.

zlib

  Required for compression support in pg_dump and pg_restore. Binaries can be downloaded from https://www.zlib.net.

### 17.1.2. Special Considerations for 64-Bit Windows

PostgreSQL will only build for the x64 architecture on 64-bit Windows, there is no support for Itanium processors.

Mixing 32- and 64-bit versions in the same build tree is not supported. The build system will automatically detect if it's running in a 32- or 64-bit environment, and build PostgreSQL accordingly. For this reason, it is important to start the correct command prompt before building.

To use a server-side third party library such as python or OpenSSL, this library must also be 64-bit. There is no support for loading a 32-bit library in a 64-bit server. Several of the third party libraries that PostgreSQL supports may only be available in 32-bit versions, in which case they cannot be used with 64-bit PostgreSQL.

### 17.1.3. Building

To build all of PostgreSQL in release configuration (the default), run the command:

    build

To build all of PostgreSQL in debug configuration, run the command:

    build DEBUG

To build just a single project, for example psql, run the commands:

    build psql
    build DEBUG psql

To change the default build configuration to debug, put the following in the `buildenv.pl` file:

    $ENV{CONFIG}="Debug";

It is also possible to build from inside the Visual Studio GUI. In this case, you need to run:

    perl mkvcbuild.pl

from the command prompt, and then open the generated `pgsql.sln` (in the root directory of the source tree) in Visual Studio.

### 17.1.4. Cleaning and Installing

Most of the time, the automatic dependency tracking in Visual Studio will handle changed files. But if there have been large changes, you may need to clean the installation. To do this, simply run the `clean.bat` command, which will automatically clean out all generated files. You can also run it with the `dist` parameter, in which case it will behave like `make distclean` and remove the flex/bison output files as well.

By default, all files are written into a subdirectory of the `debug` or `release` directories. To install these files using the standard layout, and also generate the files required to initialize and use the database, run the command:

    install c:\destination\directory

If you want to install only the client applications and interface libraries, then you can use these commands:

    install c:\destination\directory client

### 17.1.5. Running the Regression Tests

To run the regression tests, make sure you have completed the build of all required parts first. Also, make sure that the DLLs required to load all parts of the system (such as the Perl and Python DLLs for the procedural languages) are present in the system path. If they are not, set it through the `buildenv.pl` file. To run the tests, run one of the following commands from the `src\tools\msvc` directory:

    vcregress check
    vcregress installcheck
    vcregress plcheck
    vcregress contribcheck
    vcregress modulescheck
    vcregress ecpgcheck
    vcregress isolationcheck
    vcregress bincheck
    vcregress recoverycheck
    vcregress upgradecheck

To change the schedule used (default is parallel), append it to the command line like:

    vcregress check serial

For more information about the regression tests, see Chapter 32.

Running the regression tests on client programs, with `vcregress bincheck`, or on recovery tests, with `vcregress recoverycheck`, requires an additional Perl module to be installed:

IPC::Run

  As of this writing, `IPC::Run` is not included in the ActiveState Perl installation, nor in the ActiveState Perl Package Manager (PPM) library. To install, download the `IPC-Run-<version>.tar.gz` source archive from CPAN, at https://metacpan.org/release/IPC-Run, and uncompress. Edit the `buildenv.pl` file, and add a PERL5LIB variable to point to the `lib` subdirectory from the extracted archive. For example:

      $ENV{PERL5LIB}=$ENV{PERL5LIB} . ';c:\IPC-Run-0.94\lib';

Some of the TAP tests depend on a set of external commands that would optionally trigger tests related to them. Each one of those variables can be set or unset in `buildenv.pl`:

`GZIP_PROGRAM`

  Path to a gzip command. The default is `gzip`, that would be the command found in `PATH`.

`TAR`

  Path to a tar command. The default is `tar`, that would be the command found in `PATH`.