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Subject: [Boost-build] Issue running bjam with multiple jobs and custom code generator
From: Christophe B. (boost_at_[hidden])
Date: 2016-11-04 12:27:58


I developed a protoc.jam (see attachment) allowing to invoke an external
code generator tool (protoc from protobuf library). The tool generates
c++ unit files X.pb.h from a source X.proto.

When I run bjam -j1 from scratch everything works like a charm.

When I run bjam -j6 from scratch, I get compilation issues complaining
that the generated X.pb.h file is missing, because the compiler compiles
other cpp units in parallel before protoc has fully finished.

Why it does work correctly with one job and not with multiple jobs
remains a mystery to me. I would expect that bjam detects the
dependencies of cpp units with the generated X.pb.h file and waits for
its generation before starting compilation of depending cpp units.

I also attached the Jamfile of my project.

Any help would be appreciated.

Christophe B.

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