Dry run (-n) error if the builddir directory does not exist in 1.12.0

[sean-eveson-sony]

Hi. I'm using Ninja 1.12.0 on Windows.

Since 1.12.0 dry run commands will produce an error such as error: WriteFile(ninja_builddir/.ninja_lock): Unable to create file. No such file or directory if the builddir directory does not already exist. I reproduced the error with a simple build.ninja file and running ninja -n:

builddir = ninja_builddir

rule cc
    command = clang -c $in -o $out

build test.obj: cc test.cpp

Thanks!

[jhasse]

I think we should fix this regression and then release 1.12.1. Help wanted :)

[jhasse]

@jdrouhard can you have a look?