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<title>The SQLite Amalgamation</title>
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<h2>The SQLite Amalgamation</h2>
<p>The core SQLite library consists of 100 files of C code
(as of <a href="releaselog/3_8_6.html">Version 3.8.6</a>) in the core with 14 additional files
in the <a href="fts3.html">FTS3</a> and <a href="rtree.html">RTREE</a> extensions.
Most of these are "source" files in the sense that they are stored
in the configuration management system and are maintained directly.
But 6 of the core C files are generated automatically using scripts
or auxiliary programs during the compilation process. Of the 100
core files, 71 are C code and 29 are C header files.</p>
<p>The standard makefiles for SQLite have a target for building
an object we call the "amalgamation".
The amalgamation is a single C code file, named "sqlite3.c",
that contains all C code
for the core SQLite library and the <a href="fts3.html">FTS3</a> and <a href="rtree.html">RTREE</a> extensions.
This file contains about 149K lines of code
(90K if you omit blank lines and comments) and is over 5.2 megabytes
in size.</p>
<p>The amalgamation contains everything you need to integrate SQLite
into a larger project. Just copy the amalgamation into your source
directory and compile it along with the other C code files in your project.
(A <a href="howtocompile.html">more detailed discussion</a> of the compilation process is
available.)
You may also want to make use of the "sqlite3.h" header file that
defines the programming API for SQLite.
The sqlite3.h header file is available separately.
The sqlite3.h file is also contained within the amalgamation, in
the first few of thousand lines. So if you have a copy of
sqlite3.c but cannot seem to locate sqlite3.h, you can always
regenerate the sqlite3.h by copying and pasting from the amalgamation.</p>
<p>In addition to making SQLite easier to incorporate into other
projects, the amalgamation also makes it run faster. Many
compilers are able to do additional optimizations on code when
it is contained with in a single translation unit such as it
is in the amalgamation. We have measured performance improvements
of between 5 and 10% when we use the amalgamation to compile
SQLite rather than individual source files. The downside of this
is that the additional optimizations often take the form of
function inlining which tends to make the size of the resulting
binary image larger.</p>
<p>The amalgamation and
the sqlite3.h header file are available on
the <a href="download.html">download page</a> as a file
named sqlite-amalgamation-X.zip
where the X is replaced by the appropriate version number.</p>
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