1174457 - SpiderMonkey build logs always contain "ValueError: time data '' does not match format '%Y%m%d%H%M%S' "

Status: NEW

(Firefox Build System :: General, defect)

Description

[(not currently active) Ted Mielczarek]

https://treeherder.mozilla.org/logviewer.html#?job_id=10757696&repo=mozilla-inbound
```
make[3]: Leaving directory `/builds/slave/m-in_l64-d_sm-compacting-00000/src/obj-spider/config'
make[3]: Entering directory `/builds/slave/m-in_l64-d_sm-compacting-00000/src/obj-spider/config'
make[3]: Leaving directory `/builds/slave/m-in_l64-d_sm-compacting-00000/src/obj-spider/config'
cat: ../../../config/buildid: No such file or directory
make[3]: Entering directory `/builds/slave/m-in_l64-d_sm-compacting-00000/src/obj-spider/js/src'
Traceback (most recent call last):
File "<string>", line 1, in <module>
File "/tools/python27/lib/python2.7/_strptime.py", line 467, in _strptime_time
return _strptime(data_string, format)[0]
File "/tools/python27/lib/python2.7/_strptime.py", line 325, in _strptime
(data_string, format))
ValueError: time data '' does not match format '%Y%m%d%H%M%S'
make[3]: Entering directory `/builds/slave/m-in_l64-d_sm-compacting-00000/src/obj-spider/config/external/nspr' 
```

Looks like we try to process the build id file here:
https://dxr.mozilla.org/mozilla-central/source/config/external/nspr/Makefile.in#40

...but that doesn't get generated for JS shell builds. Regression from bug 1169158.