[Bug pch/14238] Dependency tracking and PCH

["geoffk at gcc dot gnu dot org" <gcc-bugzilla@gcc.gnu.org>]

------- Additional Comments From geoffk at gcc dot gnu dot org  2004-04-14 06:14 -------
> It is not correct behaviour.
> If you delete a2.h then the PCH file SHOULD be made
> (it depends on a2.h) and would fail.  Deleting it is
> no different than changing it.  When you change it,
> then you want both, the PCH file to be remade as well
> as all compilation units depending on a2.h (not pch.h).

Right, but a.o does not directly depend on a2.h.  a.o depends on pch.h.gch which depends on a2.h.

It sounds like what you want is the answer to the question "if the -include was not passed, what would 
the dependencies of a.o be?"  You can get that answer by asking that question: by using

g++-cvs-3.4 -E a.cc -MD -MP -MT a.o -MF a.deps -o /dev/null

Alternatively, you might be wanting the answer to the question "if PCH was not used, what would the 
dependencies of a.o be?"  You can get the answer to that question by using the -fpch-deps flag.

Bug 14933 already covers the problem that pch.h.gch is not mentioned in the dependency list of a.o.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|REOPENED                    |RESOLVED
         Resolution|                            |INVALID


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14238