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Re: Regression on Cygwin: Problems with parallel make in 4.4

From: Ken Brown
Subject: Re: Regression on Cygwin: Problems with parallel make in 4.4
Date: Mon, 20 Feb 2023 20:21:55 -0500
User-agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:102.0) Gecko/20100101 Thunderbird/102.8.0

On 2/19/2023 9:29 AM, Paul Smith wrote:
I will change the default setting of the jobserver to use "pipe" on
Cygwin, at least for now.

Parallel make is still not working reliably. I've just discovered that my TeX Live build logs have several occurrences of the following warning:

  jobserver unavailable: using -j1.  Add '+' to parent make rule.

This has been going on since I first started using with the jobserver style set to "pipe". It *only* occurs when the jobserver uses a pipe. Two others in the Cygwin community are reporting the same thing when they build projects using cmake (with Unix Makefiles and make

I don't know if this is Cygwin-specific, since other platforms (except GNU/Hurd) are using fifos. So the "pipe" jobserver style might not have gotten a lot of testing since the switch to fifos was made.

I guess the first step in tracking this down is for people working on other platforms to see if they can reproduce the problem when they set the jobserver style to "pipe".

Unfortunately, I don't have a simple reproduction recipe. I myself have seen it when building TeX Live, as I've said, and also when building doxygen (which uses cmake with Unix Makefiles). The other Cygwin users who have reported the problem (both CC'd) haven't yet said what cmake projects they were building.


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