docs/Writerside/topics/install.md

---
title: Build Instructions
---

The build processes uses configure and make.
Make sure that you have `make` and a
<tooltip term="supported-compilers">supported compiler</tooltip>
installed.

<tabs>
<tab title="Unix / Linux">
<procedure>
<step>
Download the latest source archive from <a href="https://sourceforge.net/projects/ucx/files/">Source Forge</a>
and extract it somewhere on your machine.
You can also use the command line to do this. 
<code-block lang="sh">
wget https://sourceforge.net/projects/ucx/files/ucx-latest.tar.gz
tar -xzf ucx-latest.tar.gz
cd ucx-latest
</code-block>
</step>
<step>
Configure the build according to your preferences. You can get a list of
all available options with <code>./configure --help</code>.
The recommended configuration for production builds is <code>./configure --release</code>.
<code-block lang="sh">
    ./configure --release
    make
    make check 
    sudo make install
</code-block>
<note>The check target is optional and only runs some tests with the built software.</note>
</step>
</procedure>
</tab>
<tab title="Windows">
<procedure>
<step>
Download the latest source archive from <a href="https://sourceforge.net/projects/ucx/files/">Source Forge</a>
and extract it somewhere on your machine.
</step>
<step>
Navigate to the folder named <code>msvc</code> in the extracted directory structure.
</step>
<step>
Open the contained <code>ucx.sln</code> in Visual Studio and build the solution.
</step>
</procedure>
</tab>
</tabs>

## Compile Time Options

When compiling UCX, you can tweak several compile time variables via macro definitions.

### Features Defines

The following macros are not defined by default.
The effect when they are defined in described in the table.

<table>
<tr>
<th>Macro</th>
<th>Effect</th>
</tr>
<tr>
    <td>CX_NO_SZMUL_BUILTINT</td>
    <td>
        By default, UCX uses a compiler builtin (only available for clang and gcc)
        to perform multiplications with overflow check.
        When this macro is defined, using the builtin is disabled and UCX will
        always use an own implementation.
        <tip>
            This macro is defined when you use the <code>--disable-szmul-builtin</code>
            option during configuration, so you do not need to define it manually.
        </tip>
    </td>
</tr>
</table>

### Small Buffer Optimizations

<table>
<tr>
<th>Macro</th>
<th>Description</th>
<th>Default</th>
</tr>
<tr>
    <td>CX_ARRAY_SWAP_SBO_SIZE</td>
    <td>The maximum item size in an array list that uses SBO.</td>
    <td>128</td>
</tr>
<tr>
    <td>CX_LINKED_LIST_SORT_SBO_SIZE</td>
    <td>The maximum list size that uses SBO during sort.</td>
    <td>1024</td>
</tr>
<tr>
    <td>CX_PRINTF_SBO_SIZE</td>
    <td>The maximum string length functions in printf.h use stack memory for.</td>
    <td>512</td>
</tr>
<tr>
    <td>CX_STRSTR_SBO_SIZE</td>
    <td>The maximum length of the "needle" in cx_strstr that can use SBO.</td>
    <td>128</td>
</tr>
</table>


### Other Buffers

<table>
<tr>
<th>Macro</th>
<th>Description</th>
<th>Default</th>
</tr>
<tr>
    <td>CX_STRREPLACE_INDEX_BUFFER_SIZE</td>
    <td>
        The number of matches the index buffer can store on the stack.
        If the function finds more matches, more index buffers of the same size are allocated on the heap.
    </td>
    <td>64</td>
</tr>
<tr>
    <td>CX_STREAM_COPY_BUF_SIZE</td>
    <td>The buffer size on the stack for a stream copy.</td>
    <td>1024</td>
</tr>
<tr>
    <td>CX_STREAM_BCOPY_BUF_SIZE</td>
    <td>The buffer size on the heap for a stream copy.</td>
    <td>8192</td>
</tr>
</table>