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sqlite/doc/compile-for-windows.md
drh 2cffc5be2a Enhance the notes on compiling for Windows11 to explain how to do 
32-bit builds on a 64-bit system.

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Notes On Compiling SQLite On Windows 11

Here are step-by-step instructions on how to build SQLite from canonical source on a new Windows 11 PC, as of 2023-08-16:

  1. Install Microsoft Visual Studio. The free "community edition" will work fine. Do a standard install for C++ development. SQLite only needs the "cl" compiler and the "nmake" build tool.

  2. Under the "Start" menu, find "All Apps" then go to "Visual Studio 20XX" and find "x64 Native Tools Command Prompt for VS 20XX". Pin that application to your task bar, as you will use it a lot. Bring up an instance of this command prompt and do all of the subsequent steps in that "x64 Native Tools" command prompt. (Or use "x86" if you want a 32-bit build.) The subsequent steps will not work in a vanilla DOS prompt. Nor will they work in PowerShell.

  3. Install TCL development libraries. This note assumes that you wil install the TCL development libraries in the "c:\Tcl" directory. Make adjustments if you want TCL installed somewhere else. SQLite needs both the "tclsh.exe" command-line tool as part of the build process, and the "tcl86.lib" library in order to run tests. You will need TCL version 8.6 or later.

    1. Get the TCL source archive, perhaps from .
    2. Untar or unzip the source archive. CD into the "win/" subfolder of the source tree.
    3. Run: `nmake /f makefile.vc release`
    4. Run: `nmake /f makefile.vc INSTALLDIR=c:\Tcl install`
    5. CD to c:\\Tcl\\lib. In that subfolder make a copy of the "`tcl86t.lib`" file to the alternative name "`tcl86.lib`" (omitting the second 't'). Leave the copy in the same directory as the original.
    6. CD to c:\\Tcl\\bin. Make a copy of the "`tclsh86t.exe`" file into "`tclsh.exe`" (without the "86t") in the same directory.
    7. Add c:\\Tcl\\bin to your %PATH%. To do this, go to Settings and search for "path". Select "edit environment variables for your account" and modify your default PATH accordingly. You will need to close and reopen your command prompts after making this change.

  4. Download the SQLite source tree and unpack it. CD into the toplevel directory of the source tree.

  5. Set the TCLDIR environment variable to point to your TCL installation. Like this:

    • `set TCLDIR=c:\Tcl`

  6. Run the "Makefile.msc" makefile with an appropriate target. Examples:

    • `nmake /f makefile.msc`
    • `nmake /f makefile.msc sqlite3.c`
    • `nmake /f makefile.msc devtest`
    • `nmake /f makefile.msc releasetest`

32-bit Builds

Doing a 32-bit build is just like doing a 64-bit build with the following minor changes:

  1. Use the "x86 Native Tools Command Prompt" instead of "x64 Native Tools Command Prompt". "x86" instead of "x64".

  2. Use a different installation directory for TCL. The recommended directory is c:\tcl32. Thus you end up with two TCL builds:

    • `c:\tcl` ← 64-bit (the default)
    • `c:\tcl32` ← 32-bit

  3. Ensure that c:\tcl32\bin comes before c:\tcl\bin on your PATH environment variable. You can achieve this using a command like:

    • `set PATH=c:\tcl32\bin;%PATH%`