I am getting a failure like so while building a --disable-debug build on Mac: 0:20.37 In file included from /Users/bzbarsky/mozilla/inbound/obj-firefox-opt/layout/base/Unified_cpp_layout_base0.cpp:74: 0:20.37 /Users/bzbarsky/mozilla/inbound/mozilla/layout/base/PresShell.cpp:130:10: fatal error: 'mozilla/a11y/Logging.h' file not found 0:20.37 #include "mozilla/a11y/Logging.h" The relevant bit of PresShell.cpp is: #ifdef ACCESSIBILITY #include "nsAccessibilityService.h" #include "mozilla/a11y/DocAccessible.h" #ifdef DEBUG #include "mozilla/a11y/Logging.h" #endif #endif and clearly DEBUG ought not to be defined! Bisect says this is caused by the fix for bug 1411156. Which is at least _possible_, I guess, because the export condition for that Logging.h file in accessible/base/moz.build is: if CONFIG['MOZ_DEBUG']: EXPORTS.mozilla.a11y += [ 'Logging.h', ]

Ah, this is a reprise of bug 861453 and bug 1281603 and so forth...

To summarize the irc discussion: The problem is that having MOZ_DEBUG set in the environment leads to a franken-build, where configure thinks it's doing a --disable-debug build, but old-configure thinks it's doing a --enable-debug build, leading to DEBUG being defined. The franken-build situation is a consequence of bug 1411156. One might ask why people would set MOZ_DEBUG in their environment, and the answer is because of bug 699538: https://hg.mozilla.org/integration/mozilla-inbound/rev/2b4e9accde67

Comment on attachment 8926597 [details] Bug 1415686 - Ensure both configure and old-configure agree on what MOZ_DEBUG means. https://reviewboard.mozilla.org/r/197826/#review203068 Can we file a follow up to change the environment variable used for bug 699538? ::: moz.configure:112 (Diff revision 1) > return bool(debug) > > set_config('MOZ_DEBUG', moz_debug) > set_define('MOZ_DEBUG', moz_debug) > -add_old_configure_assignment('MOZ_DEBUG', moz_debug) > +add_old_configure_assignment('MOZ_DEBUG', > + depends('--enable-debug')(lambda x: bool(x))) Because this is almost but not quite exactly the definition of `moz_debug` above, a comment would be nice here.

Pushed by mh@glandium.org: https://hg.mozilla.org/integration/autoland/rev/706b069128e3 Ensure both configure and old-configure agree on what MOZ_DEBUG means. r=chmanchester

This came up in bug 1281603 and bug 861453 in the past. I filed bug 1415741 to use a different env var in the cocoa code...