tree dfeeb90a1d5b082d343511a45a26f63224a7334e
parent 5233fa13e84fa4adddaf6e00f22aaee16f94342f
author RJ Ascani <rjascani@google.com> 1598320343 -0700
committer Commit Bot <commit-bot@chromium.org> 1601323605 +0000

Switch source_set stamp targets to phony targets

GN uses stamp files for a variety of output types as a mechanism for
completing a group of dependencies. Ninja's phony targets can be used in
the same manner. Semantically, stamp and phony only differ in one way:
if a phony target has no dependencies, then it is treated as always
dirty and is run every time.

The source_set output type always generates a stamp file in the target
ninja file. This CL replaces the source_set's stamp target with a phony
target. In the case where the source_set's new phony target does not
have any inputs, no targets will depend on it. An example of where that
might happen is a header only source_set. There are no object files to
generate, but targets that depend on the header only source_set will
generate dependencies on those headers through depfiles.

Bug: 187
Change-Id: I159f2f39a988eea189e4df9f5d9207fda6db5c58
Reviewed-on: https://gn-review.googlesource.com/c/gn/+/9820
Reviewed-by: Brett Wilson <brettw@chromium.org>
Commit-Queue: Brett Wilson <brettw@chromium.org>