tree 965ff730fe92686325d06d407ca7268b2de330ac
parent 4e4b8d98949995474bf09cef2ca5ec3c496b82f0
author Takuto Ikuta <tikuta@google.com> 1724060604 +0900
committer GN LUCI <gn-scoped@luci-project-accounts.iam.gserviceaccount.com> 1725265224 +0000

Implement and enable 'no_stamp_files'

This is the last CL to enable the new 'no_stamp_files'
build setting flag, which enables the generation of Ninja
phony targets instead of stamp files.

- Modify the Ninja target writers to understand phony
  aliases.

- Allow no_stamp_files to be set in the build settings
  file (e.g. `.gn`) without asserting. Note that when
  this is not set, this CL should not change the output
  of GN at all.

For testing the output of `gn gen` has been compared before
and after this CL was applied with the Fuchsia source tree
to verify that the output is the same.

On the other hand, if `no_stamp_files = true` is added
to the `.gn` file, the generated Ninja file go from
829 MiB to 797 MiB.

On Chromium, size of Ninja files go from 401 MiB to 384 MiB.

Test expecations are changed like
https://gn-review.googlesource.com/c/gn/+/17620
if 'no_stamp_files' is enabled by default.

Bug: 172
Change-Id: If26e64c759ed34467ce13b5c5c1005d56f435947
Reviewed-on: https://gn-review.googlesource.com/c/gn/+/12866
Reviewed-by: Philipp Wollermann <philwo@google.com>
Reviewed-by: Takuto Ikuta <tikuta@google.com>
Commit-Queue: Takuto Ikuta <tikuta@google.com>