[Bug 245461] net-mgmt/icinga2 [patch] add option to build without unity build system on low memory systems

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=245461

            Bug ID: 245461
           Summary: net-mgmt/icinga2 [patch] add option to build without
                    unity build system on low memory systems
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: lme at FreeBSD.org
          Reporter: alexander at wittig.name
             Flags: maintainer-feedback?(lme at FreeBSD.org)
          Assignee: lme at FreeBSD.org

Created attachment 213201
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=213201&action=edit
patch for net-mgmt/icinga2/Makefile

By default icinga2 builds using their unity build system which concatenates all
their source files into one huge file to compile in one go for speed (see
https://icinga.com/docs/icinga2/v2.11.0-rc1/doc/21-development/).
Unfortunately, this is a straight trade of RAM for time, meaning the build
fails for systems with low memory (< 4 GB). This is also the reason behind bug
#221797 prohibiting building icinga2 on an RPi.

The attached patch exposes an option (on by default => no change in default
port behavior) to disable the unity build system for such systems. This leads
to longer compilation time as each source file is built separately, but the
build requires only 10% of the memory.

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