Bug#784269: eigen3: unlimited make -j

[Julien Cristau]

Source: eigen3
Version: 3.2.2-3
Severity: grave
Control: found -1 3.2.4-1

Your debian/rules does

export NUMJOBS = $(patsubst parallel=%,%,$(filter parallel=%,$(DEB_BUILD_OPTIONS)))

and then runs make -j$(NUMJOBS).  If DEB_BUILD_OPTIONS is not set, or
doesn't contain a parallelism setting, this results in unlimited
parallelism instead of the expected -j1, pretty much killing the build
host.

Cheers,
Julien
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