[Buildroot] [Bug 14996] Too many directories in BR2_EXTERNAL causes hang during make

[bugzilla@busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=14996

--- Comment #3 from Yann E. MORIN <yann.morin.1998@free.fr> ---
David, All,

Here's how I prepared the test br2-external trees:

$ for i in $(seq 1 1000); do
    mkdir -p br2-external-${i}/configs
    touch br2-external-${i}/{Config.in,external.mk}
    echo "name: BR_TEST_${i}" >br2-external-${i}/external.desc
    touch br2-external-${i}/configs/foo{,_${i}}_defconfig
done

So, I get minimal br2-external trees, each with two defconfigs:
one that is present in all br2external trees, and one that is
specific to each tree.

And here is exactly how I tested that:

$ make --version
GNU Make 4.2.1

$ for ext in 1 10 100 1000; do time make BR2_EXTERNAL="$(for i in $(seq 1
${ext}); do echo $(pwd)/br2-external-${i}; done)" list-defconfigs >/dev/null;
done 2>&1 |grep real
real    0m0.179s
real    0m0.245s
real    0m1.299s
real    0m18.277s

What version of make are you using? How many br2-external trees do you have?

However, please do note that indeed, it was never envisioned that more than a
few
br2-external trees be used simultaneously. But that it feels like it got stuck
is
still not a nice behaviour...

Regards,
Yann E. MORIN.

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