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[bug #52697] More varieties to -j switch

From: anonymous
Subject: [bug #52697] More varieties to -j switch
Date: Tue, 19 Dec 2017 15:46:10 -0500 (EST)
User-agent: Mozilla/5.0 (Linux; Android 5.1; Xtouch Build/LMY47D) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/63.0.3239.111 Mobile Safari/537.36


                 Summary: More varieties to -j switch 
                 Project: make
            Submitted by: None
            Submitted on: Tue 19 Dec 2017 08:46:09 PM UTC
                Severity: 3 - Normal
              Item Group: Enhancement
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
       Component Version: None
        Operating System: Any
           Fixed Release: None
           Triage Status: None



On modern Systems there is an increasing number of CPU cores/threads. For
example my phone has a gentoo chroot, 8cores and 3GB RAM (shared with the
Android). Compiling c with make -j works fine, python usually too, c++ makes
the system crash. Some packages are written in more than one language.
Additionally the -j switch is set globally in /etc/portage/make.conf and
cannot be switched during an update or rebuild of multiple packages which is a
crucial thing in using a Gentoo system.
I wish to have more options deciding the number of compile threads based on
the amount of ram used or which programming language gets compiled.


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