user/openjdk8: make[1]: warning: jobserver unavailable: using -j1. Add '+' to parent make rule.
Found on pmmx, which has MAKEFLAGS=-j72
and JOBS=72
:
Configuration summary:
* Debug level: release
* JDK variant: normal
* JVM variants: server
* OpenJDK target: OS: linux, CPU architecture: x86, address length: 32
Tools summary:
* Boot JDK: openjdk version "1.8.0_252" OpenJDK Runtime Environment (IcedTea 3.16.0) (Adelie 8.252.09-r0) OpenJDK Server VM (build 25.252-b09, mixed mode) (at /usr/src/packages/user/openjdk8/src/icedtea-3.21.0/bootstrap/jdk1.7.0)
* Toolchain: gcc (GNU Compiler Collection)
* C Compiler: Version 8.5.0 (at gcc)
* C++ Compiler: Version 8.5.0 (at /usr/bin/g++)
Build performance summary:
* Cores to use: 16
* Memory limit: 128797 MB
...
make[1]: warning: jobserver unavailable: using -j1. Add '+' to parent make rule.
This likely explains the 4+ hour build time we saw in #921 (comment 12345).