On Wed, Dec 21, 2016 at 12:23 AM, Jim Blandy <jbla...@mozilla.com> wrote:
> I had a .mozconfig file that included the line:
>
> . "$topsrcdir/build/mozconfig.common"

My understanding is that we're generally not supposed to include the
in-tree mozconfigs in our local builds, since they are free to make
various automation-only assumptions, which seems to be what happened
here. It's tempting to do it anyway though, for some abstract feeling
that the build will more closely resemble an official one. (I used to
do something like this as well!)

I believe many people have fallen into this trap over the years, most
likely because of MDN pages[1] that appeared to suggest using
automation mozconfigs directly (there's at least a warning on the page
now).

[1]: 
https://developer.mozilla.org/en-US/docs/Mozilla/Developer_guide/Build_Instructions/Configuring_Build_Options#Example_.mozconfig_Files

- Ryan
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