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Re: Make -j to Compiler Question

From: Warren Young
Subject: Re: Make -j to Compiler Question
Date: Sun, 22 Sep 2019 02:42:10 -0600

On Sep 21, 2019, at 9:55 PM, Nicholas Krause <address@hidden> wrote:
> what is the easiest way to get this info into
> the gcc frontend.

I’m not seeing that this is an Automake topic.  The output of Automake is a GNU 
make file, which doesn’t control how you call “make”.  Automake is on the other 
side of that particular wall.

My solution to the problem is entirely outside any particular build system:

The first is a wrapper for GNU or BSD make, which calls the second script to 
portably determine how many cores are available here.  It then builds a -j 
option passing 1.5x that number, empirically determined to saturate modern 
boxes’ CPUs.

I install these to a directory in the PATH somewhere.

I’ve trained myself to type “mmake” instead of “make” when I know the build 
system successfully works in parallel, leaving “make” for cases where either 
parallel builds don’t work or when I don’t want multiple steps happening in 
parallel.  I then tell my programmer’s editor to run “mmake” as the build 
command instead of “make” so it runs via the editor’s shortcut for building a 

If you know a system where either script doesn’t run properly or needs a 
portability fix, let me know and I’ll fold it into the current versions shipped 
via those URLs above.

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