Facing issue with ninja

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Bhargav Shah

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Apr 21, 2020, 6:20:00 AM4/21/20
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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

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Apr 21, 2020, 6:46:48 AM4/21/20
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Is there any way to tell ninja to serialize build process?

ninja -j1

Nico Weber

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Apr 21, 2020, 2:26:50 PM4/21/20
to Bhargav Shah, ninja-build
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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