Building open62541

Building the Examples

Using the GCC compiler, the following calls build the examples on Linux.

cp /path-to/open62541.* . # copy single-file distribution to the local directory
cp /path-to/examples/server_variable.c . # copy the example server
gcc -std=c99 open62541.c server_variable.c -o server

Building the Library

Building with CMake on Ubuntu or Debian

sudo apt-get install git build-essential gcc pkg-config cmake python

# enable additional features
sudo apt-get install liburcu-dev # for multithreading
sudo apt-get install check # for unit tests
sudo apt-get install python-sphinx graphviz # for documentation generation
sudo apt-get install python-sphinx-rtd-theme # documentation style

cd open62541
mkdir build
cd build
cmake ..

# select additional features
ccmake ..

# build documentation
make doc # html documentation
make doc_pdf # pdf documentation (requires LaTeX)

Building with CMake on Windows

Here we explain the build process for Visual Studio (2013 or newer). To build with MinGW, just replace the compiler selection in the call to CMake.

cd <path-to>\open62541
mkdir build
cd build
<path-to>\cmake.exe .. -G "Visual Studio 14 2015"
:: You can use use cmake-gui for a graphical user-interface to select features
  • Then open buildopen62541.sln in Visual Studio 2015 and build as usual

Building on OS X

brew install cmake
pip install sphinx # for documentation generation
pip install sphinx_rtd_theme # documentation style
brew install graphviz # for graphics in the documentation
brew install check # for unit tests
brew install userspace-rcu # for multi-threading support

Follow Ubuntu instructions without the apt-get commands as these are taken care of by the above packages.

Building on OpenBSD

The procedure below works on OpenBSD 5.8 with gcc version 4.8.4, cmake version 3.2.3 and Python version 2.7.10.

  • Install a recent gcc, python and cmake:
pkg_add gcc python cmake
  • Tell the system to actually use the recent gcc (it gets installed as egcc on OpenBSD):
export CC=egcc CXX=eg++
  • Now procede as described for Ubuntu/Debian:
cd open62541
mkdir build
cd build
cmake ..

Build Options

Build Type and Logging

  • RelWithDebInfo -O2 optimization with debug symbols
  • Release -O2 optimization without debug symbols
  • Debug -O0 optimization with debug symbols
  • MinSizeRel -Os optimization without debug symbols

The level of logging events that are reported

  • 600: Fatal and all below
  • 500: Error and all below
  • 400: Error and all below
  • 300: Info and all below
  • 200: Debug and all below
  • 100: Trace and all below

Further options that are not inherited from the CMake configuration are defined in ua_config.h. Usually there is no need to adjust them.

UA_BUILD_* group

By default only the shared object or the library open62541.dll and open62541.dll.a resp. open62541.lib are build. Additional artifacts can be specified by the following options:

Compile example servers and clients from examples/xyz.c. A static and a dynamic binary is linked, respectively.
Compile unit tests with Check framework. The tests can be executed with make test
Generate an OPC UA information model from a nodeset XML (experimental)
Generate a self-signed certificate for the server (openSSL required)

UA_ENABLE_* group

This group contains build options related to the supported OPC UA features.

Enable subscriptions
Enable the Method service set
Enable dynamic addition and removal of nodes at runtime
Compile a single-file release files open62541.c and open62541.h
Enable multi-threading support
Measure the coverage of unit tests

Some options are marked as advanced. The advanced options need to be toggled to be visible in the cmake GUIs.

Add the type and member names to the UA_DataType structure
Generate and load UA XML Namespace 0 definition UA_GENERATE_NAMESPACE0_FILE is used to specify the file for NS0 generation from namespace0 folder. Default value is Opc.Ua.NodeSet2.xml
Use a custom implementation of some libc functions that might be missing on embedded targets (e.g. string handling).
Enable namespace handling by an external component (experimental)
Enable stateless extension
Enable udp extension

Building a shared library

open62541 is small enough that most users will want to statically link the library into their programs. If a shared library (.dll, .so) is required, this can be enabled in CMake with the BUILD_SHARED_LIBS option. Note that this option modifies the ua_config.h file that is also included in open62541.h for the single-file distribution.