779268 - Removing files from m-c could result in forcing rebuild of other files

Status: RESOLVED DUPLICATE of bug 785622

(Firefox Build System :: General, defect)

Description

[Kartikaya Gupta (email:[e-mail])]

When doing a no-op Fennec build on my mac, I would see jsapi.cpp along with a bunch of other js/src/ files getting rebuilt. Upon investigating I found that this was a result of MethodGuard.h and MethodGuard-inl.h being removed from js/src/vm/ almost a month ago.

After MethodGuard.* was removed, some of the *.o.pp files in <objdir>/js/src/.deps/ still referenced those .h files as dependencies. js/src/build/unix/mddepend.pl looks for those non-existent .h files, doesn't find them, and emits rules of the form "jsapi.cpp: FORCE", forcing a rebuild of jsapi.cpp.

Blowing away my <objdir>/js/src/.deps folder fixed this particular issue, but it seems like a deficiency in the build system that should be fixed.

Comment 1

[(not currently active) Ted Mielczarek]

Wow, that's horrible.

Comment 2

[Kartikaya Gupta (email:[e-mail])]

Same thing with the removal of netwerk/base/src/PrivateBrowsingConsumer.h causing rebuilds of a variety of code in netwerk/protocol/**, etc.

Setting DEBUG to 1 in mddepend.pl and grepping build output for "Couldn't stat" seems like a good way of catching these, if anybody else is seeing the same problem.

Comment 3

[Kyle Huey (Exited; not receiving bugmail, old account, do not use)]

Uh, why aren't the .pp files getting regenerated?

Comment 4

[Kartikaya Gupta (email:[e-mail])]

I don't know. I already blew away my objdir and rebuilt so I can't easily check that anymore either.