Facing issue with ninja

[Bhargav Shah]

Hello all, 

We have recently migrated to Ninja based build systems. We are facing below error when we build (using ninja) for first time after git clone.

Error[Ms003]: could not open file "C:/git/test/test_object.o"  for writing.

If we clean and rebuild, it works without any errors.

Build system information: 

OS: Windows 10

Ninja version: 1.9.0

Compiler: gcc

Anyone else is facing similar kind of issue?

Also, we suspect that this issue is due to concurrency in building. 

Is there any way to tell ninja to serialize build process?

Thank you.

--bhargav 

[Jan Niklas Hasse]

Is there any way to tell ninja to serialize build process?

ninja -j1

[Nico Weber]

It sounds like the build rule that needs that .o file might not have a dependency on the build rule that creates it. What do you use to generate your ninja files?

`-j1` shouldn't be needed if your build configuration is correct.

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