[SR-9735] Ninja build to nonexistent subdirectories fails

[swift-ci]

Previous ID	SR-9735
Radar	None
Original Reporter	ePirat (JIRA User)
Type	Bug

Environment

llbuild git (b8f6f85)

Additional Detail from JIRA

Votes	0
Component/s	llbuild
Labels	Bug
Assignee	None
Priority	Medium

md5: 08bc34cc7672d45d30d1b2d3ca8325d3

Issue Description:

Trying to build a ninja manifest that declares an output file to a nonexistent subdirectory, the ninja implementation of llbuild fails to create the subdirectories, which results in build failure.

This does not match the upstream ninja behavior.

A minimal ninja file to reproduce this:

rule CAT
     command = cat ${in} > ${out}build

subdir/output: CAT input

This build file requires a file named `input` to exist in the directory where this is run.

[swift-ci]

Comment by Marc Byfield (JIRA)

Hello, I'm new and I want to look into this. Where can I look for guidance?