root build fails in clad when using more than one job

[cgleggett]

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Description

When building root (have tried versions 6.33.01, 6.32.08, 6.32.02) with gcc13.3, building the clad component fails with an error of bad file descriptor, if -jN is used when N > 1:

> cat interpreter/cling/tools/plugins/clad/clad-prefix/src/clad-stamp/clad-build-err.log 
gmake[4]: *** read jobs pipe: Bad file descriptor.  Stop.
gmake[4]: *** Waiting for unfinished jobs....
gmake[5]: *** read jobs pipe: Bad file descriptor.  Stop.
gmake[5]: *** Waiting for unfinished jobs....
gmake[4]: *** [CMakeFiles/Makefile2:266: lib/Differentiator/CMakeFiles/cladDifferentiator.dir/all] Error 2
gmake[3]: *** [Makefile:136: all] Error 2

If I continue the build with just 1 job, it works fine. I can in fact kill the build after clad finishes building, and resume with -j20, and it will finish properly.

Reproducer

cmake -Dxrootd=OFF -DCMAKE_INSTALL_PREFIX=/opt/root/v6-33-01_gcc133 ../src

ROOT version

multiple. tried
6.33.01
6.32.08
6.32.02

Installation method

git clone

Operating system

linux alma 9

Additional context

No response

[guitargeek]

Ah yes we have fixed this in 6.34 onward, thanks to @dpiparo. Will backport and elaborate further.

[guitargeek]

I have backported the relevant hotfixes. Can you check if it works now with the tip of the 6.32 branch?

[cgleggett]

I tried the tip of origin/v6-32-00-patches and it worked fine.