AVR Freaks

The make.exe that ships in 5.1 appears to support -j

Ultimately "make -f Makefile" (or rather an implied -f as that's the file it uses by default) is executed. If "make -j 4 -f Makefile" is used then it says "while processing this Makefile's rules and launching commands feel free to spread them across 4 cores so that 4 commands can be run at once". The structure of the Makefile rule hierarchy may dictate whether this accrues any benefit or not.

BTW I gotta ask why you are concerned?

Quote:

I've never seen an AVR project so complex that it took more than a minute or two to build the entire thing and that's obviously only on the occasion of it remaking all targets (the whole point of make is that not everything will be recompiled on each build). Usually with just a handful of changed files a rebuild takes seconds.

(In another life I work on a 4 core (A8+M3+M3+DSP) target where the DSP build alone can take about half an hour (from "clean"). For that we use jom.exe (that ships with QT) as a replacement for nmake.exe as it does spread the build across cores and we see about a 40% increase across the whole build process on a four core machine. But AFAIK the -j option on GNU make is pretty much doing what jom does that MSVC's nmake cannot so it should be as simple as adding -j to make to get a similar benefit - do not expect to reduce build time to 25% of what it was before though!)