Regression in servo-skia-0.20130412.6 build script on 1.7 beta

[brson]

Original report.

This builds on 1.6 stable but on 1.7 beta produces

failed to run custom build command for `servo-skia v0.20130412.6 (file:///home/crate)`                                  
Process didn't exit successfully: `/home/crate/target/debug/build/servo-skia-242f584507aad753/build-script-build` (exit 
code: 101)                                                                                                              
--- stdout                                                                                                              
mkdir -p /home/crate/target/debug/build/servo-skia-242f584507aad753/out/src/ports                                       
makefile.cargo:754: recipe for target '/home/crate/target/debug/build/servo-skia-242f584507aad753/out/src/ports/SkAtomic
s_sync.h' failed                                                                                                        

--- stderr                                                                                                              
mkdir: cannot create directory '/home/crate/target/debug/build/servo-skia-242f584507aad753/out/src/ports': No such file 
or directory                                                                                                            
make: *** [/home/crate/target/debug/build/servo-skia-242f584507aad753/out/src/ports/SkAtomics_sync.h] Error 1           
thread '<main>' panicked at 'assertion failed: Command::new("make").args(&["-R", "-f", "makefile.cargo",                
                            &format!("-j{}" , env:: var ( "NUM_JOBS" ) .                                                
                                     unwrap (                                                                           
                                     ))]).status().unwrap().success()', build.rs:12  

cc @alexcrichton @larsbergstrom

[brson]

@alexcrichton Couldn't repro this locally

[larsbergstrom]

Seems... curious. Skia currently builds just fine against 1.8.0 (a pretty recent nightly):
https://travis-ci.org/servo/skia/builds/106752311

[alexcrichton]

Because I can't reproduce this locally, seems to be working for Servo, and it kinda looks spurious, I'd probably also classify this as spurious?

[alexcrichton]

I also can't recall anything that would have landed in Cargo recently to cause this to break...

[sfackler]

Looks like a one-off failure. It'd probably be worth adjusting the command invocation to record stdout and stderror and display them on failure.

[alexcrichton]

Ok, this appears to be spurious (as confirmed by @mbrubeck as well), so I'm going to close this as likely spurious.

If, however, we see this in another crater report I can definitely try to do a more thorough investigation.