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Regression on Cygwin: Problems with parallel make in 4.4

From: Ken Brown
Subject: Regression on Cygwin: Problems with parallel make in 4.4
Date: Mon, 13 Feb 2023 18:34:09 -0500
User-agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:102.0) Gecko/20100101 Thunderbird/102.7.2

Several packages that used to build fine on Cygwin with parallel make now fail to build. I either get strange errors or a hang. The problems started with version 4.4 and seem to stem from the fact that make now uses a FIFO by default instead of a pipe. If I use the flag '--jobserver-style=pipe', parallel make works again. A recent example is described here:


There may be a bug in Cygwin's FIFO implementation underlying this, but nevertheless it's a regression from 4.3 to 4.4, and most Cygwin users won't know that they have to use the --jobserver-style flag. I suggest that you provide a configure option to set the jobserver style at the time make is built, and set it to 'pipe' by default on Cygwin.



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