Building Mongodb without avx

Python Prerequisites

In order to build MongoDB, Python 3.7+ is required, and several Python modules must be installed. Python 3 is included in macOS 10.15 and later. For earlier macOS versions, Python 3 can be installed using Homebrew or MacPorts or similar.

To install the required Python modules, run:

$ python3 -m pip install -r etc/pip/compile-requirements.txt

Installing the requirements inside a python3 based virtualenv dedicated to building MongoDB is recommended.

Note: In order to compile C-based Python modules, you'll also need the Python and OpenSSL C headers. Run:

• Fedora/RHEL - dnf install python3-devel openssl-devel
• Ubuntu (20.04 and newer)/Debian (Bullseye and newer) - apt install python-dev-is-python3 libssl-dev
• Ubuntu (18.04 and older)/Debian (Buster and older) - apt install python3.7-dev libssl-dev

Debian/Ubuntu

To install dependencies on Debian or Ubuntu systems:

# apt-get install build-essential

Patching

git clone --recurse-submodules https://github.com/GermanAizek/mongodb-without-avx.git
cd mongo

Now you need to choose a patch for your requirements.

• o2_patch.diff - default optimization
• o3_patch.diff - maximum optimization (big binary file)
• os_patch.diff - size binary optimization

Example:

patch -p1 SConstruct < ../o3_patch.diff

Done! Now we perform default building that you need.

SCons

If you only want to build the database server mongod:

$ python3 buildscripts/scons.py install-mongod

Note: For C++ compilers that are newer than the supported version, the compiler may issue new warnings that cause MongoDB to fail to build since the build system treats compiler warnings as errors. To ignore the warnings, pass the switch --disable-warnings-as-errors to scons.

$ python3 buildscripts/scons.py install-mongod --disable-warnings-as-errors

Note: On memory-constrained systems, you may run into an error such as g++: fatal error: Killed signal terminated program cc1plus. To use less memory during building, pass the parameter -j1 to scons. This can be incremented to -j4, -j8, and higher as appropriate to find the fastest working option on your system. -j it's count CPU threads (if CPU does not have multithreading, then its number cores)

$ python3 buildscripts/scons.py install-mongod -j1

To install mongod directly to /opt/mongo

$ python3 buildscripts/scons.py DESTDIR=/opt/mongo install-mongod

To create an installation tree of the servers in /tmp/unpriv that can later be copied to /usr/priv

$ python3 buildscripts/scons.py DESTDIR=/tmp/unpriv PREFIX=/usr/priv install-servers

If you want to build absolutely everything (mongod, mongo, unit tests, etc):

$ python3 buildscripts/scons.py install-all-meta

SCons Targets

The following targets can be named on the scons command line to build and install a subset of components:

• install-mongod
• install-mongos
• install-core (includes only mongod and mongos)
• install-servers (includes all server components)
• install-devcore (includes mongod, mongos, and jstestshell (formerly mongo shell))
• install-all (includes a complete end-user distribution and tests)
• install-all-meta (absolutely everything that can be built and installed)

NOTE: The install-core and install-servers targets are not guaranteed to be identical. The install-core target will only ever include a minimal set of "core" server components, while install-servers is intended for a functional end-user installation. If you are testing, you should use the install-core or install-devcore targets instead.