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protobuf-c: disable parallelism to avoid race condition
Unfortunately 489d3b4 did not completely fix the problem - if you try cleaning and rebuilding protobuf-c-native it doesn't take long to reproduce the issue on a 32-core machine. I spent some time trying to debug this but failed, there is still a race between generating t.test-full.pb.h and compiling cxx_generate_packed_data.c despite BUILT_SOURCES and explicit dependencies. I even tried converting the multiple target rules to use grouped targets (&:), that didn't fix it either. Disabling parallelism as a workaround only costs ~20s and it turns out that upstream is switching to Meson soon anyway: protobuf-c/protobuf-c#340 Signed-off-by: Paul Eggleton <paul.eggleton@linux.microsoft.com> Signed-off-by: Khem Raj <raj.khem@gmail.com>
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