Bug#857831: gcc build in gnattools apparently not safe for parallel builds
Package: src:gcc-7
see
https://buildd.debian.org/status/fetch.php?pkg=gcc-7&arch=arm64&ver=7-20170314-1&stamp=1489581110&raw=0
ali.o: file not recognized: File truncated
collect2: error: ld returned 1 exit status
Makefile:215: recipe for target 'gnatmake' failed
make[4]: *** [gnatmake] Error 1
make[4]: *** Waiting for unfinished jobs....
seen with local builds as well for other files in the gnatmake, gnatlink targets.
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