Are we still supporting gcc 4.4? According to bug 894242 comment #9, it looks like that gcc 4.4 fails in the configure script. If we don't support gcc 4.4 anymore, we can remove MOZ_ENUM_TYPES macro.

Yes, B2G builds still use gcc 4.4.

Ah, bug 770625 was only for linux b2g desktop builds. I see.

Actually gcc 4.4 supports typed enums. (See bug 952785.)

Copying the assignee from the duped bug.

It won't be possible to remove this macro when the typed enum is used as the type of a bit-field for some time, due to a GCC bug. Even super-recent GCC warns when a typed enum is used as a bit-field type (either gunking up output or causing -Werror compile errors): [jwalden@find-waldo-now tmp]$ cat t.cpp enum E : char { x }; struct S { E field : 1; }; int main() { S s; s.field = x; return s.field; } [jwalden@find-waldo-now tmp]$ g++49 -std=c++0x -ofoo t.cpp t.cpp:5:13: warning: ‘S::field’ is too small to hold all values of ‘enum E’ E field : 1; ^ Better yet, the warning is enabled by default and can't be switched off by -Wno-foo or similar. I ran into this while working on this rev: https://hg.mozilla.org/integration/mozilla-inbound/rev/37314ece19fa The bit-field case is unusual enough it probably prevents few, if any, MOZ_ENUM_TYPE uses from being converted (and probably shouldn't preclude changes -- just have this as the exceptional case, as in that rev). I guess other concerns of MOZ_ENUM_TYPE (of the kind encountered in bug 952785 and bug 1058561) are going to be more often pressing.

B2G ICS emulator builds no longer fail the tests: https://treeherder.mozilla.org/#/jobs?repo=try&revision=417bb36e0bcb https://treeherder.mozilla.org/#/jobs?repo=try&revision=92e97ca9f43d