[Bug pch/14933] missing pre-compiled header depends with -MD

["mjuric at astro dot princeton dot edu" <gcc-bugzilla at gcc dot gnu dot org>]

------- Comment #6 from mjuric at astro dot princeton dot edu  2006-07-25 15:22 -------
Created an attachment (id=11935)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=11935&action=view)
Proposed fix for improper dependency tracking with PCHs

This short patch addresses the issue of precompiled header dependencies not
being recorded during -MD pass. The problem appeared because deps_add_dep() was
never called from _cpp_stack_file, as all of .gch handling is done in
should_stack_file().

The patch fixes it by calling deps_add_dep() in should_stack_file(), if the
file under consideration is a precompiled header, and if restoration of
dependencies from .gch has not been requested (restore_pch_deps == false).

Applies to HEAD as well as 4.1.1.

PS: This revealed a separate issue with counterintuitive behavior of
restore_pch_deps == true (no dependencies shown), which I'll submit as a
separate bug and proposed patch.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14933