[Debian-med-packaging] Bug#1140121: starts too many processes when built with parallel=1 on riscv64

[Simon Richter]

Source: igraph
Version: 0.10.15+ds-3~bpo12+1
Severity: normal
X-Debbugs-Cc: debian-riscv at lists.debian.org, sjr at debian.org
User: debian-riscv at lists.debian.org
Usertags: riscv64

Hi,

I haven't tested other architectures, so they may be affected as well.

I just built igraph from bookworm-backports on riscv64 with pbuilder,
asking for "-j1" to be passed to dpkg-buildpackage.

The build then started about 2000 parallel processes, leading to a
system load of 500.

I suspect that some calculation for a "-j" parameter ends up computing
an empty string.

   Simon

-- System Information:
Debian Release: 13.5
  APT prefers stable-security
  APT policy: (500, 'stable-security'), (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 6.12.90+deb13-amd64 (SMP w/20 CPU threads; PREEMPT)
Kernel taint flags: TAINT_PROPRIETARY_MODULE, TAINT_WARN, TAINT_OOT_MODULE
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled