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Best practice for parallelism with multiple targets
From: |
Adam Kellas |
Subject: |
Best practice for parallelism with multiple targets |
Date: |
Sat, 12 Jun 2010 12:01:56 -0400 |
I have a tool which generates Makefiles in GNU make syntax. In the case where a recipe produces multiple ("sibling") targets, the first, naive iteration of the tool simply stacked them up like
target1 target2 target3 ... : prereq1 prereq2 ...
[recipe]
Of course this breaks parallel builds due to a well-known, well-documented quirk of make semantics. So in the second go-round I've modified it to instead generate
target1: prereq1 prereq2 ...
[recipe]
target2 target3 ... : target1
This works better with -j but has run into some other problems which are limitations of our tool, not make, so I won't waste time detailing them. Bottom line, what's the recommended way to write Makefiles so as to enable parallel builds? Is there anything better than the above?
Thanks,
AK
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